Preliminary
Hydrology Study
FOR
The Wren
APN
670
-
110
-
043
Cathedral City
, Ca. 92
2 34
For:
Coachella Valley Community Development Group, Inc.
36101 Bob Hope
D
rive, Ste. E5
Rancho Mirage, Ca.
92270
Telephone:
626
-
277
-
6782
Contact:
Stefan Vogel
PREPARED BY: KEITH CHRISTIANSEN
DATE:
J
ULY
2024
Christiansen & Company
5225 Canyon Crest Drive, Suite 251
Riverside, Ca. 92
507
TABLE
OF
CONTENTS
1.
INTRODUCTION
2.
LOCATION
MAP
3.
NOAA
ATLAS
14
PRECIPITATION
CHART
4.
WEB
SOILS
SURVEY
5.
RCFC&WCD
PLATES
E
‐
6.1
TO
E
‐
6.3
6.
SYNTHETIC
UNIT
HYDROGRAPHS
1)
Pre
‐
Development
Flows
and
Volumes
–
E1,
Off1
&
Off2
2)
Entire
Post
Development
Project
to
Project
Retention
Basin
3)
Tributaries
Post
Development
T1
through
T7
and
New
Off2
7.
Catch
Basin
Sizing
8.
WQMP
Worksheet
9.
Infiltration
Test
10.
HYDROLOGY
MAPS
a)
Pre
‐
Development
Hydrology
Map
b)
Post
Development
Hydrology
Map
Preliminary Hydrology Study
FOR
The Wren
APN 670
-
110
-
043
Cathedral City, Ca. 92234
Site Description:
The
Wren
(APN 670
-
110
-
043)
site is located at the northeast corner of Date Palm Drive and Rosemount Avenue in the City of Cathedral City, Ca. The existing site is vacant and approximately 10.48 acres. No offsite flows enter the site. Date Palm
D
rive is an existing full width (
44 ’
c/l
to curb and
16 ’ landscape
area) and all flows within Date Palm Drive are isolated within the existing street section.
A small amount
of flow was added to Date Plan Drive due to the proposed widening of pavement by 4’ and decreasing
the
right of way by 4’. Total right of way dimension of 63’ from construction centerline remains . Rosemount
Avenue along the south has a small portion of existing improvements (approximately 180’ along the easterly frontage of said project. All flows from the intersection of Date Palm and Rosemount Avenue traverse easterly to the existing street im
provements to the east.
The
Wren proposed
site shall be comprised of 12 Apartment buildings
(204 units)
, clubhouse with pool,
asphalt parking, landscaping, curbs, gutters and 5 storm drain systems (
67.94 %
impervious surface) over
10.48 acres. All flows within the project are directed to the proposed project retention basin located along the easterly property line of the project site.
This study shall calculate
the stormwater runoff volumes
for the
pre
-
and post
-
development conditions for
100yr
-
1hr, 3hr, 6hr and 24hr storm
events. The 100yr
-
1hr event shall be used for all catch basin and
storm drain sizing.
(See Shortcut Synthetic Hydrograph
Calculations
and Hydrology Maps within this
report
This project shall be required to retain
volume
from
100
yr
-
3hr
storm event for the
Post development
condition per the City of Cathedral
City Public Works Department. Emergency overflow is provided per the southerly driveway approach (inverted section) located at the southeast corner of the property.
Lastly, the project retention basin
been calculated for both the WQMP BMP Design Volume Worksheet and Infiltration Basin Design. The project has ample volume per each WQMP Worksheet calculation.
Purpose of this study:
The purpose of this study is to determine the 10
0 yr
-
1hr, 3hr, 6hr &
24hr runoff accumul
ated by
the
proposed project
(see attached Hydrology Map
)
.
This study will ana
lyze
100yr
-
3hr
runoff
for
the
proposed
development
for peak runoff and volume containment within the proposed lot retention basin .
The report
shall utilize the
Shortcut
Synthetic
Unit Hydrograph to calculate maximum
flows and volumes to the
retention
basin
. An infiltration rate of
2 ”/hr shall be utilized for the retention basin storm capacity.
Please
note infiltration rates of 14.40 in/hr and 17.01 in/hr were measured per the Sladden Engineering Infiltration Report. Therefore, the City Ordinance maximum of 2”/hr shall be used in subsequent calculations
.
The City of Cathedral City’s Stormwater Ordinance requires the drawdown time of a retention basin to be 36 hours. Drawdown of the project retention basin for the 100yr -
3hr storm event is
17.68 hours.
Flood Rate Map
The project area is covered by FIRM Panel Number 06065C1595G and 06065C01615G, revised August 28,
2008, which indicates the project area lies within Zone X, indicating “areas determined to be outside the 0.2
%
”. (See Map Below)
Existing
Project
Flows
Existing offsite flows
from Date Palm Drive (Off1) and Rosemount Ave. (Off2) do
not
impact or pass through the development. The existing flow created from the vacant land (E1) drains historically northwest to southeast as noted on the Pre -
Development
Hydrology Map. Existing Tributary areas E1, Off1 and Off2 shall be calculated and noted
on said Pre
-
Development Hydrology Map.
PROPOSED FLOOD CONTROL REQUIREMENTS
The drainage of this project site falls under the jurisdiction of the City of Cathedral City
.
Per the Master Drainage
Plan for the City of
Cathedral City
, the
peak volume
for the
100
yr
-
3hr
storm is
required to be retained on
-
site and street and associated storm drain
systems are required to be sized to
convey the 100
-
year 1
-
hour peak flow.
Flows and
volumes for T1, T1, T3, T4, T5, T6,
T7,
Off1 and New Off2 shall be calculated,
Sources:
The majority soil type for this project is
MaB
per Web Soils Survey.
This coincides with soil type “
A
” per
RCFD&WCD.
Rainfall data for the above
storm events
was derived by NOAA ATLAS 14
and are as follows:
100yr
-
1hr :
1. 93
"
100yr
-
3hr :
2. 70
"
100yr
-
6hr :
3. 49
"
100yr
-
24hr :
5.26 "
Analysis:
In keeping with the recently accepted parameters of the City of Cathedral City
, we find that
p
er the RCFC&WCD manual the runoff i
ndex for this project will be
32 , per WebSoi
l
Survey the
soil type
will be “
A
”
. The development type is
residentia
l
which leads us to use Plate
E
-
6.2
when using an AMCII
to ac
quire
pervious Loss Rate for
Residen
tial/
C
ommercial of 0.74
.
Storm runoff volumes for the
100
-
year event were obtained utilizing the Synthetic Unit
Hydrograph
Shortcut
Method, as described in the RCFC&WCD
Hydrology Manual
. The Short
-
Cut method is useful for
evaluating
those areas less than
100
-
200 acres with a lag time of less than 7 to 8 minutes. Peak flow storm rates were
analyzed using the RCFCD Rational Method.
Total
Vacant
Area of Tributary draining to
the southeast corner of the property is 10.48 acres. Offsite drainage (OFF1) from Date Palm Drive comprises
1.18 acres
.
Off2 from Rosemount Drive comprises
0.42 acres and E1 comprises 10.48 acres.
Total
Proposed
Area of Tributary draining to
the proposed retention basin is 10.48 acres. Offsite
drainage (OFF1) from Date Palm Drive comprises 1.18 acres. New Off2 draining to Rosemount Drive comprises 0.21acres. All proposed
tributaries and the associated flows and volumes are noted below.
Low Loss Rates:
90 %
HYDRAULIC CALCULATIONS
Please see
highlighted
values in Synthetic Unit Hydrograph (SUH).
Project Pre
-
development Flows (
10.48
ac.
-
IMP%=5.0
)
Pre
-
development
E1
–
10.48 acres
–
5.0% imp.
Storm Event
Storm Volume
Max. Q
100
yr
-
1hr
46544
cf
35.61
cfs
100
yr
-
3hr
36112
cf
20.61
cfs
100
yr
-
6hr
34343
cf
17.31
cfs
100
yr
-
24hr
20687
cf
1.18
cfs
Off1 (Date Palm Drive)
–
1.18 acres
–
90% imp.
Storm Event
Storm Volume
Max. Q
100yr
-
1hr
7665
cf
4.68
cfs
100yr
-
3hr
9758
cf
2.99
cfs
100yr
-
6hr
11369
cf
2.62
cfs
100yr
-
24hr
12156
cf
0. 71
cfs
Off2 (Rosemount Ave.)
-
0.42 acres
–
25.0% imp
Storm Event
Storm Volume
Max. Q
100yr
-
1hr
2068
c
f
1.48
cfs
100yr
-
3hr
1745
cf
0.88
cfs
100yr
-
6hr
1693
cf
0.75
cfs
100yr
-
24hr 1
00 0
cf
0.0 9
cfs
Therefore, total adjacent volume within Date Palm Drive = 12156 cf
Therefore, total volume existing to
Rosemount Ave. = 46544+2068 = 48612 cf
Project Post
-
development Retention Basin Calculations (
10.48
ac.
-
IMP%=
67.94
)
–
for Critical 100yr
-
3hr storm e
vent
Total Dev
.
Site
–
10.48 acres
–
67.94
imp%
-
Retention Basin Total Cap. at 5.0’ depth=6
5260
cf
Storm Event
Storm Volume (cf)
Max. Q (cfs)
Vol. in Basin (cf)
Depth
100yr
-
3 hr
70268
25.04
6 5009
4.9 8
’
Please note that the based on the
critical
100
yr
–
3 hr
storm event and
2 ”
/hr
infiltration rate
a
maximum
peak
39.66
cfs and
66256
cf shall flow into the
Proposed Retention Basin. Please note the Proposed
Retention Basin has a total capacity of
61872 cf
at the 355.0 ft elevation (overflow point at southeasterly drive access to the retention basin. Total storm volume in the retention basin is 61382 cf (depth of 4.96’)
and therefore, the proposed retention basin shall contain 100% of the 100yr -
3hr storm event
as required
by the City of Cathedral City Public Works Department.
The
lowest adjacent pad elevation is 357.0
feet.
Therefore freeboard = 2.1
’
.
Please note Retention Basin Drawdown time is 17.68 hrs (per spreadsheet calculation for Overall Post Development
Project Critical
Post Development
Results from the 100yr
–
1 hr
Short Cut Synthetic Unit Hydrograph
analyses
shall be
used in the hydraulic
calculations to determine inlet
and storm drain pipe
sizing. The storm drain system is proposed to capture
and convey storm flow to the
Proposed Project Retention Basin
(see Post Development
Hydrology Map
)
.
T1
–
Total A
rea
=
1. 90
ac
–
Imp%=
90.0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
1 2341
cf
7. 54
cfs
100yr
-
3hr
15713
cf
4. 82
cfs
100yr
-
6hr
18306
cf
4.22
cfs
100yr
-
24hr
19573
cf
1.14
cfs
T2
–
Total Area =
1. 17
ac
–
Imp%=
90.0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
7600
cf
4.64
cfs
100yr
-
3hr
9676
cf
2.97
cfs
100yr
-
6hr
11272
cf
2.60
cfs
100yr
-
24hr
12053
cf
0. 70
cfs
T3
–
Total Area =
1. 87
ac
–
Imp%=
90.0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
12 147
cf
7. 42
cfs
100yr
-
3hr
1 5465
cf
4. 74
cfs
100yr
-
6hr
18 016
cf
4. 16
cfs
100yr
-
24hr
19 264
cf
1.1 2
cfs
T4
–
Total Area =
3. 30
ac
–
Imp%=
87.3
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
21220
cf
13.04
cfs
100yr
-
3hr
26644
cf
8.31
cfs
100yr
-
6hr
30537
cf
7.28
cfs
100yr
-
24hr
32055
cf
1. 93
cfs
T5
–
Total Area = 0.
52
ac
–
Imp%=
90.0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
3378
cf
2. 06
cfs
100yr
-
3hr
4300
cf
1. 32
cfs
100yr
-
6hr
5010
cf
1 .
16
cfs
100yr
-
24hr
5357
c
f
0. 31
cfs
T6 (Retention Basin)
–
Total Area =
1. 54
ac
–
Imp%=
5.0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
6838
cf
5.23
cfs
100yr
-
3hr
5306
cf
3.03
cfs
100yr
-
6hr
5046
cf
2. 54
cfs
100yr
-
24hr
3039
cf
0. 17
cfs
T7
–
Total Area =
0.42
ac
–
Imp%=5
7 .0
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
2393
cf
1.57
cfs
100yr
-
3hr
2497
cf
0.97
cfs
100yr
-
6hr
2416
cf
0.84
cfs
100yr
-
24hr
1999
cf
0.17 cfs
(New Off2)
–
Total Area = 0.
21
ac
–
Imp%=
55.50
Storm Event
Storm Volume
Max. Q (cfs)
100yr
-
1hr
1189
cf
0. 78
cfs
100yr
-
3hr
1227
cf
0. 48
cfs
100yr
-
6hr
1186
cf
0. 42
cfs
100yr
-
24hr
962
cf
0. 08
cfs
Pipe Sizing
Calculations for preliminary pipe sized have been calculated with a Manning’s Formula and minimum slope of
0.50 % to show maximum pipe capacity. Please see calculations below for the proposed 8”, 24” and 30” proposed storm drain lines for the project.
Gravity flow pipe maximums with pipe flowing full, per Mannings equation, N=0.012 (HDPE, PVC, or ABS pipe)
Check flow pipe capacity:
Diam.=
8
(in.)
Slope=
0.0 05
n Factor=
0.012
Formulas
Area=(PI)*((Diam/2)^2)=
0.34906585
(sf)
Flow (max.)=(Area)*(1.49/n)*((diam./4)^0.6666)*(slope)^0.5=
0.93
(cfs)
Check
flow pipe capacity:
Diam.=
24
(in.)
Slope=
0.0 05
n Factor=
0.012
Formulas
Area=(PI)*((Diam/2)^2)=
3.141592654
(sf)
Flow (max.)=(Area)*(1.49/n)*((diam./4)^0.6666)*(slope)^0.5=
17.38
(cfs)
Check flow pipe capacity:
Diam.=
30
(in.)
Slope=
0.0 05
n Factor=
0.012
Formulas
Area=(PI)*((Diam/2)^2)=
4.908738521
(sf)
Flow (max.)=(Area)*(1.49/n)*((diam./4)^0.6666)*(slope)^0.5=
31.51
(cfs)
All flows within these pipe diameters are less than the capacities noted above.
Catch
Basin
Sizing
Catch basins 2 through 5 are all Riv. Co. Std. 300 Catch Basins. All have been sized per the Nomograph located
in this report. Catch Basins 2, 3 and 5 are all 4’ in width and have the depth at entrance less than the proposed top
of curb. Catch Basin 4 is a 7’ wide basin and also has maximum depth below the proposed top of curb. Catch Basin
1 is a Nyoplast 2’ x 3’
Steel bar/MAG
Grate
Inlet
. With 50% clogging factor the maximum depth at inlet is
0.525’
as noted
on the provided Capacity Chart provided
in this report.
WQMP Worksheet (
10.48
ac.)
10.48
acre area
WQMP Worksheet for the White
w
ater River Basin for this project at
67.94 % impervious equals the requirement
of
7228
cf
containment. The project retention
has a
total
capacity of
6 5230
cf. Therefore, all WQMP measures
for
“first flush”
are
100% contained.
Conclusions:
If the designs contained within this report and the plans that are based upon its findings
are followed, the design
shall provide protection
and 100% containment
for the above
100yr
-
3hr storm event.
Any emergency overflow shall
flow southerly along the proposed retention basin driveway located at the southeast corner of the property and
flow easterly within the existing 6” Curb & Gutter of Rosemount Ave.
Lastly, flows to Date Palm Drive remain unchanged. Flows heading easterly on and along Rosemount Drive are
greatly reduced:
Existing Flows to Rosemount Ave. = E1 + Off2 = 46544+2068 = 48612 cf
Post Development Flows to Rosemount Ave. = T5 + New Off2
= 4015 +1227 = 5242 cf
Reduction of flow to Rosemount Ave = 43370 cf or 89.2% reduction .
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations
The Wren - Entire Site Post Condition
Drainage Area (ac.)
10.4815
Unit time (minutes)
5 5
5 15
100 Year Storm Duration (hrs)
1 3
6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70
3.49 5.26
Or data from NOAA interactive website
Soils Group
A
AMC index II Runoff Number (plate E-6.1)
32 Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr)
0.74 (AMC II)
Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
67.94 310162
sf impervious
Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.)
0.29 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6)) Low Loss Rate Percent (%)
90 Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" sometimes used (Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((diam/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors
Upper sec. (ft.)=
0.0001
Lower sec. (ft.)=
0.0001
Ring diam. (ft.) =
0.0001
Drywell lower max. (cf)=
0.00 Upper max.(cf)=
0.00 Gravel bed width around drwyell=
0 Drywell total(cf)=
0.00 Ret. Basin design (area, depth)
Top =
25510
s.f.
Bot. =
3800
s.f.
Max. Depth (d)=
5 Max. storage=
65259.52
(d/3)*(bottom+top+(bottom*top)^0.50)
Formulas
vol=(h/3)*(bottom+top+(bottom*top)^0.50)
area=bottom+(h/d)*(top-bottom)
h=(vol*3)/(bottom+top+(bottom*top)^0.5)
(values must be non-zero or error occurs)
Outside input from:
N/A
1 Hour Storm in 5 minute increments
Drywell
Drywell
Drywell
Drywell
Overflow
Basin
Basin
Basin
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
Outside
Retention
Period
Storage
Storage
To
Retention
Period
Storage
Storage
Overflow
Overflow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
Input (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Basin (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Vol. (cf)
Rate (cfs)
0:05
3.7 0.8569
0.2875
N/A
0.5694
6.0179
1805.37
0.00 0.00
0.00 0.00
0.00 1805.37
3800.00
52.78 1752.59
0.13 0.00
0.00 0:10
4.8 1.1117
0.2875
N/A
0.8242
8.7104
2613.13
0.00 0.00
0.00 0.00
0.00 2613.13
4383.04
60.88 4304.84
0.33 0.00
0.00 0:15
5.1 1.1812
0.2875
N/A
0.8936
9.4447
2833.42
0.00 0.00
0.00 0.00
0.00 2833.42
5232.10
72.67 7065.60
0.54 0.00
0.00 0:20
4.9 1.1348
0.2875
N/A
0.8473
8.9552
2686.56
0.00 0.00
0.00 0.00
0.00 2686.56
6150.53
85.42 9666.73
0.74 0.00
0.00 0:25
6.6 1.5286
0.2875
N/A
1.2410
13.1164
3934.91
0.00 0.00
0.00 0.00
0.00 3934.91
7015.85
97.44 13504.20
1.03 0.00
0.00 0:30
7.3 1.6907
0.2875
N/A
1.4032
14.8298
4448.93
0.00 0.00
0.00 0.00
0.00 4448.93
8292.47
115.17
17837.96
1.37 0.00
0.00 0:35
8.4 1.9454
0.2875
N/A
1.6579
17.5223
5256.69
0.00 0.00
0.00 0.00
0.00 5256.69
9734.19
135.20
22959.45
1.76 0.00
0.00 0:40
9 2.0844
0.2875
N/A
1.7969
18.9909
5697.28
0.00 0.00
0.00 0.00
0.00 5697.28
11437.96
158.86
28497.88
2.18 0.00
0.00 0:45
12.3 2.8487
0.2875
N/A
2.5612
27.0685
8120.55
0.00 0.00
0.00 0.00
0.00 8120.55
13280.44
184.45
36433.98
2.79 0.00
0.00 0:50
17.6 4.0762
0.2875
N/A
3.7886
40.0415
12012.46
0.00 0.00
0.00 0.00
0.00 12012.46
15920.56
221.12
48225.32
3.69 0.00
0.00 0:55
16.1 3.7288
0.2875
N/A
3.4412
36.3699
10910.98
0.00 0.00
0.00 0.00
0.00 10910.98
19843.20
275.60
58860.70
4.51 0.00
0.00 1:00
4.2 0.9727
0.2875
N/A
0.6852
7.2418
2172.53
0.00 0.00
0.00 0.00
0.00 2172.53
23381.29
324.74
60708.49
4.65 0.00
0.00 0
0.0000
0.2875
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23996.00
333.28
60375.21
4.63 0.00
0.00 0
0.0000
0.2875
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23885.13
331.74
60043.48
4.60 0.00
0.00 1:15
0 0.0000
0.2875
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23774.77
330.21
59713.27
4.58 0.00
0.00 Total volume (cf)
62492.82
Total Overflow (cf)
0.00 Drawdown time =
271.15
cf/5min x
12.00 per/hr =
3253.80
cf/hr. Therefore,
60708.49
cf. /
3253.8
cf/hr =
18.6577209
hours for total drawdown plus storm event =
19.25 hrs total drawdown
2 of 6
3 Hour Storm in 5 minute increments
Drywell
Drywell
Drywell
Drywell
Overflow
Basin
Basin
Basin
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
Outside
Retention
Period
Storage
Storage
To
Retention
Period
Storage
Storage
Overflow
Overflow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
Input (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Basin (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Vol. (cf)
Rate (cfs)
0:05
1.3 0.42
0.29 N/A
0.1337
1.4128
423.85
0.00 0.00
0.00 0.00
0.00 423.85
3800.00
52.78 371.08
0.03 0.00
0.00 0:10
1.3 0.42
0.29 N/A
0.1337
1.4128
423.85
0.00 0.00
0.00 0.00
0.00 423.85
3923.45
54.49 740.44
0.06 0.00
0.00 0:15
1.1 0.36
0.29 N/A
0.0689
0.7280
218.40
0.00 0.00
0.00 0.00
0.00 218.40
4046.32
56.20 902.64
0.07 0.00
0.00 0:20
1.5 0.49
0.29 N/A
0.1985
2.0977
629.31
0.00 0.00
0.00 0.00
0.00 629.31
4100.28
56.95 1475.00
0.11 0.00
0.00 0:25
1.5 0.49
0.29 N/A
0.1985
2.0977
629.31
0.00 0.00
0.00 0.00
0.00 629.31
4290.69
59.59 2044.72
0.16 0.00
0.00 0:30
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
4480.22
62.23 2919.99
0.22 0.00
0.00 0:35
1.5 0.49
0.29 N/A
0.1985
2.0977
629.31
0.00 0.00
0.00 0.00
0.00 629.31
4771.40
66.27 3483.04
0.27 0.00
0.00 0:40
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
4958.71
68.87 4351.67
0.33 0.00
0.00 0:45
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
5247.68
72.88 5216.28
0.40 0.00
0.00 0:50
1.5 0.49
0.29 N/A
0.1985
2.0977
629.31
0.00 0.00
0.00 0.00
0.00 629.31
5535.31
76.88 5768.71
0.44 0.00
0.00 0:55
1.6 0.52
0.29 N/A
0.2309
2.4401
732.04
0.00 0.00
0.00 0.00
0.00 732.04
5719.09
79.43 6421.32
0.49 0.00
0.00 1:00
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
5936.19
82.45 7276.38
0.56 0.00
0.00 1:05
2.2 0.71
0.29 N/A
0.4253
4.4947
1348.42
0.00 0.00
0.00 0.00
0.00 1348.42
6220.65
86.40 8538.40
0.65 0.00
0.00 1:10
2.2 0.71
0.29 N/A
0.4253
4.4947
1348.42
0.00 0.00
0.00 0.00
0.00 1348.42
6640.48
92.23 9794.58
0.75 0.00
0.00 1:15
2.2 0.71
0.29 N/A
0.4253
4.4947
1348.42
0.00 0.00
0.00 0.00
0.00 1348.42
7058.38
98.03 11044.97
0.85 0.00
0.00 1:20
2 0.65
0.29 N/A
0.3605
3.8099
1142.96
0.00 0.00
0.00 0.00
0.00 1142.96
7474.35
103.81
12084.11
0.93 0.00
0.00 1:25
2.6 0.84
0.29 N/A
0.5549
5.8644
1759.33
0.00 0.00
0.00 0.00
0.00 1759.33
7820.04
108.61
13734.84
1.05 0.00
0.00 1:30
2.7 0.87
0.29 N/A
0.5873
6.2069
1862.06
0.00 0.00
0.00 0.00
0.00 1862.06
8369.19
116.24
15480.66
1.19 0.00
0.00 1:35
2.4 0.78
0.29 N/A
0.4901
5.1796
1553.87
0.00 0.00
0.00 0.00
0.00 1553.87
8949.98
124.31
16910.23
1.30 0.00
0.00 1:40
2.7 0.87
0.29 N/A
0.5873
6.2069
1862.06
0.00 0.00
0.00 0.00
0.00 1862.06
9425.56
130.91
18641.38
1.43 0.00
0.00 1:45
3.3 1.07
0.29 N/A
0.7817
8.2615
2478.44
0.00 0.00
0.00 0.00
0.00 2478.44
10001.46
138.91
20980.91
1.61 0.00
0.00 1:50
3.1 1.00
0.29 N/A
0.7169
7.5766
2272.98
0.00 0.00
0.00 0.00
0.00 2272.98
10779.76
149.72
23104.17
1.77 0.00
0.00 1:55
2.9 0.94
0.29 N/A
0.6521
6.8917
2067.52
0.00 0.00
0.00 0.00
0.00 2067.52
11486.10
159.53
25012.16
1.92 0.00
0.00 2:00
3 0.97
0.29 N/A
0.6845
7.2342
2170.25
0.00 0.00
0.00 0.00
0.00 2170.25
12120.84
168.34
27014.06
2.07 0.00
0.00 2:05
3.1 1.00
0.29 N/A
0.7169
7.5766
2272.98
0.00 0.00
0.00 0.00
0.00 2272.98
12786.82
177.59
29109.45
2.23 0.00
0.00 2:10
4.2 1.36
0.29 N/A
1.0733
11.3433
3403.00
0.00 0.00
0.00 0.00
0.00 3403.00
13483.89
187.28
32325.17
2.48 0.00
0.00 2:15
5 1.62
0.29 N/A
1.3325
14.0828
4224.83
0.00 0.00
0.00 0.00
0.00 4224.83
14553.67
202.13
36347.87
2.78 0.00
0.00 2:20
3.5 1.13
0.29 N/A
0.8465
8.9463
2683.90
0.00 0.00
0.00 0.00
0.00 2683.90
15891.91
220.72
38811.04
2.97 0.00
0.00 2:25
6.8 2.20
0.29 N/A
1.9157
20.2465
6073.96
0.00 0.00
0.00 0.00
0.00 6073.96
16711.34
232.10
44652.90
3.42 0.00
0.00 2:30
7.3 2.37
0.29 N/A
2.0777
21.9587
6587.60
0.00 0.00
0.00 0.00
0.00 6587.60
18654.76
259.09
50981.41
3.91 0.00
0.00 2:35
8.2 2.66
0.29 N/A
2.3693
25.0406
7512.17
0.00 0.00
0.00 0.00
0.00 7512.17
20760.08
288.33
58205.24
4.46 0.00
0.00 2:40
5.9 1.91
0.29 N/A
1.6241
17.1647
5149.40
0.00 0.00
0.00 0.00
0.00 5149.40
23163.24
321.71
63032.92
4.83 0.00
0.00 2:45
2 0.65
0.29 N/A
0.3605
3.8099
1142.96
0.00 0.00
0.00 0.00
0.00 1142.96
24769.28
344.02
63831.86
4.89 0.00
0.00 2:50
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
25035.06
347.71
64421.65
4.94 0.00
0.00 2:55
1.8 0.58
0.29 N/A
0.2957
3.1250
937.50
0.00 0.00
0.00 0.00
0.00 937.50
25231.27
350.43
65008.72
4.98 0.00
0.00 ok MAX DEPTH=5.0'
3:00
0.6 0.19
0.29 0.17
0.0194
0.2055
61.64 0.00
0.00 0.00
0.00 0.00
61.64 25426.57
353.15
64717.21
4.96 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 25329.59
351.80
64365.41
4.93 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 25212.56
350.17
64015.24
4.90 0.00
0.00 3:15
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 25096.06
348.56
63666.68
4.88 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24980.11
346.95
63319.73
4.85 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24864.69
345.34
62974.39
4.82 0.00
0.00 3:30
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24749.80
343.75
62630.64
4.80 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24635.45
342.16
62288.48
4.77 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24521.62
340.58
61947.91
4.75 0.00
0.00 Total volume (cf)
70267.54
Total Overflow (cf)
0.00 Drawdown time =
332.49
cf/5min x
12.0000
per/hr =
3989.88
cf/hr. Therefore,
58553.00
cf. /
3989.88
cf/hr =
14.6753787
hours for total drawdown plus storm event =
17.68 hrs total drawdown
3 of 6
6 Hour Storm in 5 minute increments
Drywell
Drywell
Drywell
Drywell
Overflow
Basin
Basin
Basin
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
Outside
Retention
Period
Storage
Storage
To
Retention
Period
Storage
Storage
Overflow
Overflow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
Input (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Basin (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Vol. (cf)
Rate (cfs)
0:05
0.5 0.21
0.29 0.19
0.0209
0.2213
66.39 0.00
0.00 0.00
0.00 0.00
66.39 3800.00
52.78 13.62
0.00 0.00
0.00 0:10
0.6 0.25
0.29 0.23
0.0251
0.2656
79.67 0.00
0.00 0.00
0.00 0.00
79.67 3804.53
52.84 40.45
0.00 0.00
0.00 0:15
0.6 0.25
0.29 0.23
0.0251
0.2656
79.67 0.00
0.00 0.00
0.00 0.00
79.67 3813.46
52.96 67.15
0.01 0.00
0.00 0:20
0.6 0.25
0.29 0.23
0.0251
0.2656
79.67 0.00
0.00 0.00
0.00 0.00
79.67 3822.34
53.09 93.74
0.01 0.00
0.00 0:25
0.6 0.25
0.29 0.23
0.0251
0.2656
79.67 0.00
0.00 0.00
0.00 0.00
79.67 3831.18
53.21 120.20
0.01 0.00
0.00 0:30
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3839.99
53.33 159.82
0.01 0.00
0.00 0:35
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3853.17
53.52 199.25
0.02 0.00
0.00 0:40
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3866.29
53.70 238.50
0.02 0.00
0.00 0:45
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3879.34
53.88 277.58
0.02 0.00
0.00 0:50
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3892.34
54.06 316.47
0.02 0.00
0.00 0:55
0.7 0.29
0.29 0.26
0.0293
0.3098
92.95 0.00
0.00 0.00
0.00 0.00
92.95 3905.28
54.24 355.18
0.03 0.00
0.00 1:00
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
3918.16
54.42 451.43
0.03 0.00
0.00 1:05
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
3950.18
54.86 547.24
0.04 0.00
0.00 1:10
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
3982.05
55.31 642.60
0.05 0.00
0.00 1:15
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4013.78
55.75 737.52
0.06 0.00
0.00 1:20
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4045.35
56.19 832.01
0.06 0.00
0.00 1:25
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4076.79
56.62 926.06
0.07 0.00
0.00 1:30
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4108.07
57.06 1019.67
0.08 0.00
0.00 1:35
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4139.22
57.49 1112.85
0.09 0.00
0.00 1:40
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4170.22
57.92 1205.61
0.09 0.00
0.00 1:45
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4201.07
58.35 1297.93
0.10 0.00
0.00 1:50
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4231.78
58.77 1389.82
0.11 0.00
0.00 1:55
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4262.36
59.20 1481.29
0.11 0.00
0.00 2:00
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4292.79
59.62 1705.13
0.13 0.00
0.00 2:05
0.8 0.34
0.29 N/A
0.0475
0.5022
150.67
0.00 0.00
0.00 0.00
0.00 150.67
4367.25
60.66 1795.14
0.14 0.00
0.00 2:10
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4397.19
61.07 2017.53
0.15 0.00
0.00 2:15
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4471.18
62.10 2238.89
0.17 0.00
0.00 2:20
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4544.81
63.12 2459.22
0.19 0.00
0.00 2:25
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4618.11
64.14 2678.54
0.21 0.00
0.00 2:30
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4691.07
65.15 2896.84
0.22 0.00
0.00 2:35
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4763.70
66.16 3114.14
0.24 0.00
0.00 2:40
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
4835.99
67.17 3330.43
0.26 0.00
0.00 2:45
1 0.42
0.29 N/A
0.1313
1.3875
416.24
0.00 0.00
0.00 0.00
0.00 416.24
4907.94
68.17 3678.51
0.28 0.00
0.00 2:50
1 0.42
0.29 N/A
0.1313
1.3875
416.24
0.00 0.00
0.00 0.00
0.00 416.24
5023.74
69.77 4024.98
0.31 0.00
0.00 2:55
1 0.42
0.29 N/A
0.1313
1.3875
416.24
0.00 0.00
0.00 0.00
0.00 416.24
5139.00
71.37 4369.85
0.33 0.00
0.00 3:00
1 0.42
0.29 N/A
0.1313
1.3875
416.24
0.00 0.00
0.00 0.00
0.00 416.24
5253.73
72.97 4713.13
0.36 0.00
0.00 3:05
1 0.42
0.29 N/A
0.1313
1.3875
416.24
0.00 0.00
0.00 0.00
0.00 416.24
5367.92
74.55 5054.82
0.39 0.00
0.00 3:10
1.1 0.46
0.29 N/A
0.1732
1.8301
549.03
0.00 0.00
0.00 0.00
0.00 549.03
5481.59
76.13 5527.71
0.42 0.00
0.00 3:15
1.1 0.46
0.29 N/A
0.1732
1.8301
549.03
0.00 0.00
0.00 0.00
0.00 549.03
5638.91
78.32 5998.43
0.46 0.00
0.00 3:20
1.1 0.46
0.29 N/A
0.1732
1.8301
549.03
0.00 0.00
0.00 0.00
0.00 549.03
5795.51
80.49 6466.97
0.50 0.00
0.00 3:25
1.2 0.50
0.29 N/A
0.2150
2.2727
681.82
0.00 0.00
0.00 0.00
0.00 681.82
5951.38
82.66 7066.13
0.54 0.00
0.00 3:30
1.3 0.54
0.29 N/A
0.2569
2.7154
814.61
0.00 0.00
0.00 0.00
0.00 814.61
6150.70
85.43 7795.31
0.60 0.00
0.00 3:35
1.4 0.59
0.29 N/A
0.2988
3.1580
947.39
0.00 0.00
0.00 0.00
0.00 947.39
6393.28
88.80 8653.90
0.66 0.00
0.00 3:40
1.4 0.59
0.29 N/A
0.2988
3.1580
947.39
0.00 0.00
0.00 0.00
0.00 947.39
6678.91
92.76 9508.53
0.73 0.00
0.00 3:45
1.5 0.63
0.29 N/A
0.3407
3.6006
1080.18
0.00 0.00
0.00 0.00
0.00 1080.18
6963.22
96.71 10492.00
0.80 0.00
0.00 3:50
1.5 0.63
0.29 N/A
0.3407
3.6006
1080.18
0.00 0.00
0.00 0.00
0.00 1080.18
7290.39
101.26
11470.92
0.88 0.00
0.00 3:55
1.6 0.67
0.29 N/A
0.3826
4.0432
1212.97
0.00 0.00
0.00 0.00
0.00 1212.97
7616.05
105.78
12578.11
0.96 0.00
0.00 4:00
1.6 0.67
0.29 N/A
0.3826
4.0432
1212.97
0.00 0.00
0.00 0.00
0.00 1212.97
7984.38
110.89
13680.18
1.05 0.00
0.00 4:05
1.7 0.71
0.29 N/A
0.4244
4.4858
1345.75
0.00 0.00
0.00 0.00
0.00 1345.75
8351.01
115.99
14909.95
1.14 0.00
0.00 4:10
1.8 0.75
0.29 N/A
0.4663
4.9285
1478.54
0.00 0.00
0.00 0.00
0.00 1478.54
8760.12
121.67
16266.82
1.25 0.00
0.00 4:15
1.9 0.80
0.29 N/A
0.5082
5.3711
1611.33
0.00 0.00
0.00 0.00
0.00 1611.33
9211.51
127.94
17750.21
1.36 0.00
0.00 4 of 6
4:20
2 0.84
0.29 N/A
0.5501
5.8137
1744.11
0.00 0.00
0.00 0.00
0.00 1744.11
9704.99
134.79
19359.53
1.48 0.00
0.00 4:25
2.1 0.88
0.29 N/A
0.5920
6.2563
1876.90
0.00 0.00
0.00 0.00
0.00 1876.90
10240.37
142.23
21094.21
1.62 0.00
0.00 4:30
2.1 0.88
0.29 N/A
0.5920
6.2563
1876.90
0.00 0.00
0.00 0.00
0.00 1876.90
10817.45
150.24
22820.87
1.75 0.00
0.00 4:35
2.2 0.92
0.29 N/A
0.6338
6.6990
2009.69
0.00 0.00
0.00 0.00
0.00 2009.69
11391.86
158.22
24672.33
1.89 0.00
0.00 4:40
2.3 0.96
0.29 N/A
0.6757
7.1416
2142.47
0.00 0.00
0.00 0.00
0.00 2142.47
12007.79
166.77
26648.03
2.04 0.00
0.00 4:45
2.4 1.01
0.29 N/A
0.7176
7.5842
2275.26
0.00 0.00
0.00 0.00
0.00 2275.26
12665.05
175.90
28747.39
2.20 0.00
0.00 4:50
2.4 1.01
0.29 N/A
0.7176
7.5842
2275.26
0.00 0.00
0.00 0.00
0.00 2275.26
13363.45
185.60
30837.05
2.36 0.00
0.00 4:55
2.5 1.05
0.29 N/A
0.7595
8.0268
2408.05
0.00 0.00
0.00 0.00
0.00 2408.05
14058.62
195.26
33049.84
2.53 0.00
0.00 5:00
2.6 1.09
0.29 N/A
0.8014
8.4695
2540.84
0.00 0.00
0.00 0.00
0.00 2540.84
14794.75
205.48
35385.19
2.71 0.00
0.00 5:05
3.1 1.30
0.29 N/A
1.0108
10.6826
3204.77
0.00 0.00
0.00 0.00
0.00 3204.77
15571.66
216.27
38373.69
2.94 0.00
0.00 5:10
3.6 1.51
0.29 N/A
1.2202
12.8957
3868.70
0.00 0.00
0.00 0.00
0.00 3868.70
16565.84
230.08
42012.31
3.22 0.00
0.00 5:15
3.9 1.63
0.29 N/A
1.3458
14.2236
4267.07
0.00 0.00
0.00 0.00
0.00 4267.07
17776.31
246.89
46032.49
3.53 0.00
0.00 5:20
4.2 1.76
0.29 N/A
1.4714
15.5514
4665.43
0.00 0.00
0.00 0.00
0.00 4665.43
19113.71
265.47
50432.44
3.86 0.00
0.00 5:25
4.7 1.97
0.29 N/A
1.6808
17.7645
5329.36
0.00 0.00
0.00 0.00
0.00 5329.36
20577.45
285.80
55476.01
4.25 0.00
0.00 5:30
5.6 2.35
0.29 N/A
2.0578
21.7481
6524.44
0.00 0.00
0.00 0.00
0.00 6524.44
22255.30
309.10
61691.35
4.73 0.00
0.00 5:35
1.9 0.80
0.29 N/A
0.5082
5.3711
1611.33
0.00 0.00
0.00 0.00
0.00 1611.33
24322.97
337.82
62964.86
4.82 0.00
0.00 5:40
0.9 0.38
0.29 N/A
0.0894
0.9449
283.46
0.00 0.00
0.00 0.00
0.00 283.46
24746.63
343.70
62904.61
4.82 0.00
0.00 5:45
0.6 0.25
0.29 0.23
0.0251
0.2656
79.67 0.00
0.00 0.00
0.00 0.00
79.67 24726.59
343.42
62640.86
4.80 0.00
0.00 5:50
0.5 0.21
0.29 0.19
0.0209
0.2213
66.39 0.00
0.00 0.00
0.00 0.00
66.39 24638.85
342.21
62365.05
4.78 0.00
0.00 5:55
0.3 0.13
0.29 0.11
0.0126
0.1328
39.84 0.00
0.00 0.00
0.00 0.00
39.84 24547.09
340.93
62063.95
4.76 0.00
0.00 6:00
0.2 0.08
0.29 0.08
0.0084
0.0885
26.56 0.00
0.00 0.00
0.00 0.00
26.56 24446.93
339.54
61750.97
4.73 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24342.80
338.09
61412.87
4.71 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24230.33
336.53
61076.34
4.68 0.00
0.00 6:15
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24118.38
334.98
60741.36
4.65 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 24006.94
333.43
60407.93
4.63 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23896.02
331.89
60076.04
4.60 0.00
0.00 6:30
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23785.61
330.36
59745.69
4.58 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23675.71
328.83
59416.86
4.55 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23566.31
327.31
59089.55
4.53 0.00
0.00 6:45
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23457.43
325.80
58763.75
4.50 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23349.04
324.29
58439.46
4.48 0.00
0.00 0
0.00 0.29
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23241.16
322.79
58116.67
4.45 0.00
0.00 7:00
0 0.00
0.29 0.00
0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 23133.78
321.30
57795.36
4.43 0.00
0.00 Total volume (cf)
70427.11
Total Overflow (cf)
0.00 Drawdown time =
263.80
cf/5min x
12 per/hr =
3165.6
cf/hr. Therefore,
62964.86
cf. /
3165.6
cf/hr =
19.8903393
hours for total drawdown plus storm event =
23.97 hrs total drawdown
5 of 6
24 Hour Storm in 15 minute increments
Drywell
Drywell
Drywell
Drywell
Overflow
Basin
Basin
Basin
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
Outside
Retention
Period
Storage
Storage
To
Retention
Period
Storage
Storage
Overflow
Overflow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
Input (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Basin (cf)
Area (sf)
Perc. (cf)
Vol. (cf)
Depth (ft)
Vol. (cf)
Rate (cfs)
0:15
0.2 0.04
0.50 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 3800.00
40.03 0.00
0.00 0.00
0.00 0:30
0.3 0.06
0.50 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 3800.00
60.04 0.00
0.00 0.00
0.00 0:45
0.3 0.06
0.49 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 3800.00
60.04 0.00
0.00 0.00
0.00 1:00
0.4 0.08
0.49 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 3800.00
80.05 0.00
0.00 0.00
0.00 1:15
0.3 0.06
0.48 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 3800.00
60.04 0.00
0.00 0.00
0.00 1:30
0.3 0.06
0.48 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 3800.00
60.04 0.00
0.00 0.00
0.00 1:45
0.3 0.06
0.47 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 3800.00
60.04 0.00
0.00 0.00
0.00 2:00
0.4 0.08
0.46 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 3800.00
80.05 0.00
0.00 0.00
0.00 2:15
0.4 0.08
0.46 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 3800.00
80.05 0.00
0.00 0.00
0.00 2:30
0.4 0.08
0.45 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 3800.00
80.05 0.00
0.00 0.00
0.00 2:45
0.5 0.11
0.45 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
3800.00
100.07
0.00 0.00
0.00 0.00
3:00
0.5 0.11
0.44 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
3800.00
100.07
0.00 0.00
0.00 0.00
3:15
0.5 0.11
0.44 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
3800.00
100.07
0.00 0.00
0.00 0.00
3:30
0.5 0.11
0.43 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
3800.00
100.07
0.00 0.00
0.00 0.00
3:45
0.5 0.11
0.43 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
3800.00
100.07
0.00 0.00
0.00 0.00
4:00
0.6 0.13
0.42 0.11
0.0126
0.1334
120.08
0.00 0.00
0.00 0.00
0.00 120.08
3800.00
120.08
0.00 0.00
0.00 0.00
4:15
0.6 0.13
0.42 0.11
0.0126
0.1334
120.08
0.00 0.00
0.00 0.00
0.00 120.08
3800.00
120.08
0.00 0.00
0.00 0.00
4:30
0.7 0.15
0.41 0.13
0.0147
0.1557
140.09
0.00 0.00
0.00 0.00
0.00 140.09
3800.00
140.09
0.00 0.00
0.00 0.00
4:45
0.7 0.15
0.40 0.13
0.0147
0.1557
140.09
0.00 0.00
0.00 0.00
0.00 140.09
3800.00
140.09
0.00 0.00
0.00 0.00
5:00
0.8 0.17
0.40 0.15
0.0168
0.1779
160.11
0.00 0.00
0.00 0.00
0.00 160.11
3800.00
158.33
1.77 0.00
0.00 0.00
5:15
0.6 0.13
0.39 0.11
0.0126
0.1334
120.08
0.00 0.00
0.00 0.00
0.00 120.08
3800.59
158.36
0.00 0.00
0.00 0.00
5:30
0.7 0.15
0.39 0.13
0.0147
0.1557
140.09
0.00 0.00
0.00 0.00
0.00 140.09
3800.00
140.09
0.00 0.00
0.00 0.00
5:45
0.8 0.17
0.38 0.15
0.0168
0.1779
160.11
0.00 0.00
0.00 0.00
0.00 160.11
3800.00
158.33
1.77 0.00
0.00 0.00
6:00
0.8 0.17
0.38 0.15
0.0168
0.1779
160.11
0.00 0.00
0.00 0.00
0.00 160.11
3800.59
158.36
3.52 0.00
0.00 0.00
6:15
0.9 0.19
0.37 0.17
0.0189
0.2001
180.12
0.00 0.00
0.00 0.00
0.00 180.12
3801.17
158.38
25.26 0.00
0.00 0.00
6:30
0.9 0.19
0.37 0.17
0.0189
0.2001
180.12
0.00 0.00
0.00 0.00
0.00 180.12
3808.40
158.68
46.69 0.00
0.00 0.00
6:45
1 0.21
0.36 0.19
0.0210
0.2224
200.13
0.00 0.00
0.00 0.00
0.00 200.13
3815.53
158.98
87.84 0.01
0.00 0.00
7:00
1 0.21
0.36 0.19
0.0210
0.2224
200.13
0.00 0.00
0.00 0.00
0.00 200.13
3829.22
159.55
128.42
0.01 0.00
0.00 7:15
1 0.21
0.35 0.19
0.0210
0.2224
200.13
0.00 0.00
0.00 0.00
0.00 200.13
3842.72
160.11
168.44
0.01 0.00
0.00 7:30
1.1 0.23
0.35 0.21
0.0231
0.2446
220.14
0.00 0.00
0.00 0.00
0.00 220.14
3856.04
160.67
227.92
0.02 0.00
0.00 7:45
1.2 0.25
0.34 0.23
0.0252
0.2668
240.16
0.00 0.00
0.00 0.00
0.00 240.16
3875.82
161.49
306.58
0.02 0.00
0.00 8:00
1.3 0.27
0.34 0.25
0.0274
0.2891
260.17
0.00 0.00
0.00 0.00
0.00 260.17
3901.99
162.58
404.17
0.03 0.00
0.00 8:15
1.5 0.32
0.33 0.28
0.0316
0.3336
300.20
0.00 0.00
0.00 0.00
0.00 300.20
3934.46
163.94
540.43
0.04 0.00
0.00 8:30
1.5 0.32
0.33 0.28
0.0316
0.3336
300.20
0.00 0.00
0.00 0.00
0.00 300.20
3979.79
165.82
674.81
0.05 0.00
0.00 8:45
1.6 0.34
0.33 0.30
0.0337
0.3558
320.21
0.00 0.00
0.00 0.00
0.00 320.21
4024.49
167.69
827.33
0.06 0.00
0.00 9:00
1.7 0.36
0.32 N/A
0.0368
0.3893
350.36
0.00 0.00
0.00 0.00
0.00 350.36
4075.23
169.80
1007.89
0.08 0.00
0.00 9:15
1.9 0.40
0.32 N/A
0.0835
0.8822
793.94
0.00 0.00
0.00 0.00
0.00 793.94
4135.30
172.30
1629.53
0.12 0.00
0.00 9:30
2 0.42
0.31 N/A
0.1090
1.1522
1036.98
0.00 0.00
0.00 0.00
0.00 1036.98
4342.10
180.92
2485.59
0.19 0.00
0.00 9:45
2.1 0.44
0.31 N/A
0.1345
1.4218
1279.62
0.00 0.00
0.00 0.00
0.00 1279.62
4626.89
192.79
3572.43
0.27 0.00
0.00 10:00
2.2 0.46
0.30 N/A
0.1600
1.6909
1521.85
0.00 0.00
0.00 0.00
0.00 1521.85
4988.45
207.85
4886.43
0.37 0.00
0.00 10:15
1.5 0.32
0.30 0.28
0.0316
0.3336
300.20
0.00 0.00
0.00 0.00
0.00 300.20
5425.58
226.07
4960.56
0.38 0.00
0.00 10:30
1.5 0.32
0.29 0.28
0.0316
0.3336
300.20
0.00 0.00
0.00 0.00
0.00 300.20
5450.24
227.09
5033.66
0.39 0.00
0.00 10:45
2 0.42
0.29 N/A
0.1309
1.3838
1245.41
0.00 0.00
0.00 0.00
0.00 1245.41
5474.56
228.11
6050.97
0.46 0.00
0.00 11:00
2 0.42
0.29 N/A
0.1352
1.4287
1285.84
0.00 0.00
0.00 0.00
0.00 1285.84
5812.99
242.21
7094.60
0.54 0.00
0.00 11:15
1.9 0.40
0.28 N/A
0.1183
1.2508
1125.72
0.00 0.00
0.00 0.00
0.00 1125.72
6160.17
256.67
7963.64
0.61 0.00
0.00 11:30
1.9 0.40
0.28 N/A
0.1225
1.2948
1165.30
0.00 0.00
0.00 0.00
0.00 1165.30
6449.28
268.72
8860.22
0.68 0.00
0.00 11:45
1.7 0.36
0.27 N/A
0.0845
0.8935
804.18
0.00 0.00
0.00 0.00
0.00 804.18
6747.54
281.15
9383.25
0.72 0.00
0.00 12:00
1.8 0.38
0.27 N/A
0.1097
1.1589
1043.02
0.00 0.00
0.00 0.00
0.00 1043.02
6921.54
288.40
10137.87
0.78 0.00
0.00 12:15
2.5 0.53
0.27 N/A
0.2610
2.7580
2482.21
0.00 0.00
0.00 0.00
0.00 2482.21
7172.58
298.86
12321.22
0.94 0.00
0.00 12:30
2.6 0.55
0.26 N/A
0.2860
3.0224
2720.16
0.00 0.00
0.00 0.00
0.00 2720.16
7898.92
329.12
14712.26
1.13 0.00
0.00 12:45
2.8 0.59
0.26 N/A
0.3320
3.5087
3157.80
0.00 0.00
0.00 0.00
0.00 3157.80
8694.35
362.26
17507.79
1.34 0.00
0.00 6 of 6
13:00
2.9 0.61
0.25 N/A
0.3569
3.7721
3394.85
0.00 0.00
0.00 0.00
0.00 3394.85
9624.35
401.01
20501.63
1.57 0.00
0.00 13:15
3.4 0.72
0.25 N/A
0.4659
4.9244
4431.97
0.00 0.00
0.00 0.00
0.00 4431.97
10620.31
442.51
24491.08
1.88 0.00
0.00 13:30
3.4 0.72
0.25 N/A
0.4697
4.9644
4467.96
0.00 0.00
0.00 0.00
0.00 4467.96
11947.49
497.81
28461.23
2.18 0.00
0.00 13:45
2.3 0.48
0.24 N/A
0.2420
2.5578
2302.04
0.00 0.00
0.00 0.00
0.00 2302.04
13268.25
552.84
30210.43
2.31 0.00
0.00 14:00
2.3 0.48
0.24 N/A
0.2457
2.5968
2337.10
0.00 0.00
0.00 0.00
0.00 2337.10
13850.16
577.09
31970.44
2.45 0.00
0.00 14:15
2.7 0.57
0.23 N/A
0.3335
3.5247
3172.20
0.00 0.00
0.00 0.00
0.00 3172.20
14435.66
601.49
34541.15
2.65 0.00
0.00 14:30
2.6 0.55
0.23 N/A
0.3160
3.3402
3006.16
0.00 0.00
0.00 0.00
0.00 3006.16
15290.87
637.12
36910.20
2.83 0.00
0.00 14:45
2.6 0.55
0.23 N/A
0.3196
3.3775
3039.76
0.00 0.00
0.00 0.00
0.00 3039.76
16078.98
669.96
39280.00
3.01 0.00
0.00 15:00
2.5 0.53
0.22 N/A
0.3020
3.1919
2872.74
0.00 0.00
0.00 0.00
0.00 2872.74
16867.35
702.81
41449.94
3.18 0.00
0.00 15:15
2.4 0.50
0.22 N/A
0.2844
3.0058
2705.21
0.00 0.00
0.00 0.00
0.00 2705.21
17589.22
732.88
43422.26
3.33 0.00
0.00 15:30
2.3 0.48
0.22 N/A
0.2667
2.8191
2537.18
0.00 0.00
0.00 0.00
0.00 2537.18
18245.36
760.22
45199.21
3.46 0.00
0.00 15:45
1.9 0.40
0.21 N/A
0.1859
1.9647
1768.23
0.00 0.00
0.00 0.00
0.00 1768.23
18836.50
784.85
46182.59
3.54 0.00
0.00 16:00
1.9 0.40
0.21 N/A
0.1892
1.9992
1799.29
0.00 0.00
0.00 0.00
0.00 1799.29
19163.64
798.49
47183.39
3.62 0.00
0.00 16:15
0.4 0.08
0.21 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 19496.58
812.36
46451.09
3.56 0.00
0.00 16:30
0.4 0.08
0.20 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 19252.97
802.21
45728.93
3.50 0.00
0.00 16:45
0.3 0.06
0.20 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 19012.73
792.20
44996.78
3.45 0.00
0.00 17:00
0.3 0.06
0.20 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 18769.16
782.05
44274.77
3.39 0.00
0.00 17:15
0.5 0.11
0.20 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
18528.97
772.04
43602.79
3.34 0.00
0.00 17:30
0.5 0.11
0.19 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
18305.42
762.73
42940.13
3.29 0.00
0.00 17:45
0.5 0.11
0.19 0.09
0.0105
0.1112
100.07
0.00 0.00
0.00 0.00
0.00 100.07
18084.97
753.54
42286.66
3.24 0.00
0.00 18:00
0.4 0.08
0.19 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 17867.58
744.48
41622.23
3.19 0.00
0.00 18:15
0.4 0.08
0.18 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 17646.54
735.27
40967.01
3.14 0.00
0.00 18:30
0.4 0.08
0.18 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 17428.57
726.19
40320.87
3.09 0.00
0.00 18:45
0.3 0.06
0.18 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 17213.62
717.23
39663.68
3.04 0.00
0.00 19:00
0.2 0.04
0.18 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 16994.99
708.12
38995.58
2.99 0.00
0.00 19:15
0.3 0.06
0.17 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 16772.73
698.86
38356.75
2.94 0.00
0.00 19:30
0.4 0.08
0.17 0.08
0.0084
0.0889
80.05 0.00
0.00 0.00
0.00 0.00
80.05 16560.21
690.01
37746.80
2.89 0.00
0.00 19:45
0.3 0.06
0.17 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 16357.30
681.55
37125.28
2.84 0.00
0.00 20:00
0.2 0.04
0.17 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 16150.53
672.94
36492.37
2.80 0.00
0.00 20:15
0.3 0.06
0.16 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 15939.98
664.17
35888.25
2.75 0.00
0.00 20:30
0.3 0.06
0.16 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 15739.01
655.79
35292.49
2.70 0.00
0.00 20:45
0.3 0.06
0.16 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 15540.82
647.53
34705.00
2.66 0.00
0.00 21:00
0.2 0.04
0.16 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 15345.37
639.39
34105.63
2.61 0.00
0.00 21:15
0.3 0.06
0.16 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 15145.98
631.08
33534.59
2.57 0.00
0.00 21:30
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 14956.01
623.17
32951.45
2.52 0.00
0.00 21:45
0.3 0.06
0.15 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 14762.02
615.08
32396.41
2.48 0.00
0.00 22:00
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 14577.37
607.39
31829.04
2.44 0.00
0.00 22:15
0.3 0.06
0.15 0.06
0.0063
0.0667
60.04 0.00
0.00 0.00
0.00 0.00
60.04 14388.62
599.53
31289.55
2.40 0.00
0.00 22:30
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 14209.15
592.05
30737.53
2.36 0.00
0.00 22:45
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 14025.51
584.40
30193.16
2.31 0.00
0.00 23:00
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 13844.41
576.85
29656.34
2.27 0.00
0.00 23:15
0.2 0.04
0.15 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 13665.83
569.41
29126.96
2.23 0.00
0.00 23:30
0.2 0.04
0.14 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 13489.72
562.07
28604.91
2.19 0.00
0.00 23:45
0.2 0.04
0.14 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 13316.05
554.84
28090.10
2.15 0.00
0.00 24:00
0.2 0.04
0.14 0.04
0.0042
0.0445
40.03 0.00
0.00 0.00
0.00 0.00
40.03 13144.78
547.70
27582.43
2.11 0.00
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0.00
0.00 0.00
0.00 0.00
0.00 12975.90
540.66
27041.77
2.07 0.00
0.00 Total volume (cf)
65392.04
Total Overflow (cf)
0.00 Drawdown time =
635.42
cf/5min x
12 per/hr =
7625.04
cf/hr. Therefore,
47183.39
cf. /
7625.04
cf/hr =
6.19 hours for total drawdown plus storm event =
29.15 hrs total drawdown
POST
DEVELOPMENT
T1
–
T7
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T1
Drainage Area (ac.) 1.9000
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
90 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.14 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 0.0001
s.f.
Bot. = 0.0001 s.f. Max. Depth (d)= 0.0001 Max. storage= 0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 3.7 0.8569 0.1406 N/A 0.7163 1.3723 411.70
0:10 4.8 1.1117 0.1406 N/A 0.9711 1.8604 558.13
0:15 5.1 1.1812 0.1406 N/A 1.0406 1.9935 598.06
0:20 4.9 1.1348 0.1406 N/A 0.9942 1.9048 571.44
0:25 6.6 1.5286 0.1406 N/A 1.3880 2.6591 797.73
0:30 7.3 1.6907 0.1406 N/A 1.5501 2.9697 890.91
0:35 8.4 1.9454 0.1406 N/A 1.8048 3.4578 1037.33
0:40 9 2.0844 0.1406 N/A 1.9438 3.7240 1117.20
0:45 12.3 2.8487 0.1406 N/A 2.7081 5.1882 1556.47
0:50 17.6 4.0762 0.1406 N/A
3.9356 7.5399 2261.96
0:55 16.1 3.7288 0.1406 N/A 3.5882 6.8743 2062.29
1:00
4.2 0.9727 0.1406 N/A 0.8321 1.5942 478.26
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
1:15 0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
Total volume (cf) 12341.49
2 of 6
3 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 1.3 0.42 0.14 N/A 0.2806 0.5376 161.27
0:10 1.3 0.42 0.14 N/A 0.2806 0.5376 161.27
0:15 1.1 0.36 0.14 N/A 0.2158 0.4134 124.03
0:20 1.5 0.49 0.14 N/A 0.3454 0.6617 198.52
0:25 1.5 0.49 0.14 N/A 0.3454 0.6617 198.52
0:30 1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
0:35 1.5 0.49 0.14 N/A 0.3454 0.6617 198.52
0:40 1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
0:45 1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
0:50 1.5 0.49 0.14 N/A 0.3454 0.6617 198.52
0:55 1.6 0.52 0.14 N/A 0.3778 0.7238 217.14
1:00
1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
1:05 2.2 0.71 0.14 N/A 0.5722 1.0962 328.87
1:10 2.2 0.71 0.14 N/A 0.5722 1.0962 328.87
1:15 2.2 0.71 0.14 N/A 0.5722 1.0962 328.87
1:20 2 0.65 0.14 N/A 0.5074 0.9721 291.63
1:25 2.6 0.84 0.14 N/A 0.7018 1.3445 403.36
1:30 2.7 0.87 0.14 N/A 0.7342 1.4066 421.98
1:35 2.4 0.78 0.14 N/A 0.6370 1.2204 366.12
1:40 2.7 0.87 0.14 N/A 0.7342 1.4066 421.98
1:45 3.3 1.07 0.14 N/A 0.9286 1.7790 533.71
1:50 3.1 1.00 0.14 N/A 0.8638 1.6549 496.47
1:55 2.9 0.94 0.14 N/A 0.7990 1.5308 459.23
2:00
3 0.97 0.14 N/A 0.8314 1.5928 477.85
2:05 3.1 1.00 0.14 N/A 0.8638 1.6549 496.47
2:10 4.2 1.36 0.14 N/A 1.2202 2.3377 701.31
2:15 5 1.62 0.14 N/A 1.4794 2.8343 850.29
2:20 3.5 1.13 0.14 N/A 0.9934 1.9032 570.96
2:25 6.8 2.20 0.14 N/A 2.0626 3.9516 1185.48
2:30 7.3 2.37 0.14 N/A 2.2246 4.2620 1278.59
2:35 8.2 2.66 0.14 N/A
2.5162 4.8206 1446.19
2:40 5.9 1.91 0.14 N/A 1.7710 3.3929 1017.88
2:45 2 0.65 0.14 N/A 0.5074 0.9721 291.63
2:50 1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
2:55 1.8 0.58 0.14 N/A 0.4426 0.8479 254.38
3:00
0.6 0.19 0.14 N/A 0.0538 0.1031 30.92
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 15712.75
3 of 6
6 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 0.5 0.21 0.14 N/A 0.0688 0.1318 39.54
0:10 0.6 0.25 0.14 N/A 0.1107 0.2120 63.61
0:15 0.6 0.25 0.14 N/A 0.1107 0.2120 63.61
0:20 0.6 0.25 0.14 N/A 0.1107 0.2120 63.61
0:25 0.6 0.25 0.14 N/A 0.1107 0.2120 63.61
0:30 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
0:35 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
0:40 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
0:45 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
0:50 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
0:55 0.7 0.29 0.14 N/A 0.1526 0.2923 87.68
1:00
0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:05 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:10 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:15 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:20 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:25 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:30 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:35 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:40 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:45 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:50 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
1:55 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
2:00
0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:05 0.8 0.34 0.14 N/A 0.1944 0.3725 111.75
2:10 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:15 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:20 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:25 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:30 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:35 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:40 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
2:45 1 0.42 0.14 N/A 0.2782 0.5330 159.90
2:50 1 0.42 0.14 N/A 0.2782 0.5330 159.90
2:55 1 0.42 0.14 N/A 0.2782 0.5330 159.90
3:00
1 0.42 0.14 N/A 0.2782 0.5330 159.90
3:05 1 0.42 0.14 N/A 0.2782 0.5330 159.90
3:10 1.1 0.46 0.14 N/A 0.3201 0.6132 183.97
3:15 1.1 0.46 0.14 N/A 0.3201 0.6132 183.97
3:20 1.1 0.46 0.14 N/A 0.3201 0.6132 183.97
3:25 1.2 0.50 0.14 N/A 0.3620 0.6935 208.04
3:30 1.3 0.54 0.14 N/A 0.4038 0.7737 232.11
3:35 1.4 0.59 0.14 N/A 0.4457 0.8539 256.18
3:40 1.4 0.59 0.14 N/A 0.4457 0.8539 256.18
3:45 1.5 0.63 0.14 N/A 0.4876 0.9342 280.25
3:50 1.5 0.63 0.14 N/A 0.4876 0.9342 280.25
3:55 1.6 0.67 0.14 N/A 0.5295 1.0144 304.32
4:00
1.6 0.67 0.14 N/A 0.5295 1.0144 304.32
4:05 1.7 0.71 0.14 N/A 0.5714 1.0946 328.39
4:10 1.8 0.75 0.14 N/A 0.6132 1.1749 352.46
4:15 1.9 0.80 0.14 N/A 0.6551 1.2551 376.53
4 of 6
4:20 2 0.84 0.14 N/A 0.6970 1.3353 400.60
4:25 2.1 0.88 0.14 N/A 0.7389 1.4156 424.67
4:30 2.1 0.88 0.14 N/A 0.7389 1.4156 424.67
4:35 2.2 0.92 0.14 N/A 0.7808 1.4958 448.74
4:40 2.3 0.96 0.14 N/A 0.8226 1.5760 472.81
4:45 2.4 1.01 0.14 N/A 0.8645 1.6563 496.88
4:50 2.4 1.01 0.14 N/A 0.8645 1.6563 496.88
4:55 2.5 1.05 0.14 N/A 0.9064 1.7365 520.95
5:00
2.6 1.09 0.14 N/A 0.9483 1.8167 545.02
5:05 3.1 1.30 0.14 N/A 1.1577 2.2179 665.38
5:10 3.6 1.51 0.14 N/A 1.3671 2.6191 785.73
5:15 3.9 1.63 0.14 N/A 1.4927 2.8598 857.94
5:20 4.2 1.76 0.14 N/A 1.6184 3.1005 930.15
5:25 4.7 1.97 0.14 N/A 1.8278 3.5017 1050.51
5:30 5.6 2.35 0.14 N/A
2.2047 4.2238 1267.14
5:35 1.9 0.80 0.14 N/A 0.6551 1.2551 376.53
5:40 0.9 0.38 0.14 N/A 0.2363 0.4527 135.82
5:45 0.6 0.25 0.14 N/A 0.1107 0.2120 63.61
5:50 0.5 0.21 0.14 N/A 0.0688 0.1318 39.54
5:55 0.3 0.13 0.14 0.11 0.0126 0.0241 7.22
6:00
0.2 0.08 0.14 0.08 0.0084 0.0160 4.81
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:45 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
7:00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 18305.52
5 of 6
24 Hour Storm in 15 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:15 0.2 0.04 0.25 0.04 0.0042 0.0081 7.26
0:30 0.3 0.06 0.24 0.06 0.0063 0.0121 10.88
0:45 0.3 0.06 0.24 0.06 0.0063 0.0121 10.88
1:00
0.4 0.08 0.24 0.08 0.0084 0.0161 14.51
1:15 0.3 0.06 0.24 0.06 0.0063 0.0121 10.88
1:30 0.3 0.06 0.23 0.06 0.0063 0.0121 10.88
1:45 0.3 0.06 0.23 0.06 0.0063 0.0121 10.88
2:00
0.4 0.08 0.23 0.08 0.0084 0.0161 14.51
2:15 0.4 0.08 0.22 0.08 0.0084 0.0161 14.51
2:30 0.4 0.08 0.22 0.08 0.0084 0.0161 14.51
2:45 0.5 0.11 0.22 0.09 0.0105 0.0202 18.14
3:00
0.5 0.11 0.22 0.09 0.0105 0.0202 18.14
3:15 0.5 0.11 0.21 0.09 0.0105 0.0202 18.14
3:30 0.5 0.11 0.21 0.09 0.0105 0.0202 18.14
3:45 0.5 0.11 0.21 0.09 0.0105 0.0202 18.14
4:00
0.6 0.13 0.21 0.11 0.0126 0.0242 21.77
4:15 0.6 0.13 0.20 0.11 0.0126 0.0242 21.77
4:30 0.7 0.15 0.20 0.13 0.0147 0.0282 25.39
4:45 0.7 0.15 0.20 0.13 0.0147 0.0282 25.39
5:00
0.8 0.17 0.20 0.15 0.0168 0.0322 29.02
5:15 0.6 0.13 0.19 0.11 0.0126 0.0242 21.77
5:30 0.7 0.15 0.19 0.13 0.0147 0.0282 25.39
5:45 0.8 0.17 0.19 0.15 0.0168 0.0322 29.02
6:00
0.8 0.17 0.19 0.15 0.0168 0.0322 29.02
6:15 0.9 0.19 0.18 0.17 0.0189 0.0363 32.65
6:30 0.9 0.19 0.18 0.17 0.0189 0.0363 32.65
6:45 1 0.21 0.18 N/A 0.0326 0.0624 56.14
7:00
1 0.21 0.18 N/A 0.0350 0.0670 60.28
7:15 1 0.21 0.17 N/A 0.0373 0.0716 64.40
7:30 1.1 0.23 0.17 N/A 0.0608 0.1164 104.76
7:45 1.2 0.25 0.17 N/A 0.0841 0.1612 145.09
8:00
1.3 0.27 0.17 N/A 0.1075 0.2060 185.38
8:15 1.5 0.32 0.16 N/A 0.1519 0.2910 261.91
8:30 1.5 0.32 0.16 N/A 0.1542 0.2954 265.86
8:45 1.6 0.34 0.16 N/A 0.1775 0.3401 306.05
9:00
1.7 0.36 0.16 N/A 0.2008 0.3847 346.20
9:15 1.9 0.40 0.15 N/A 0.2451 0.4696 422.60
9:30 2 0.42 0.15 N/A 0.2683 0.5141 462.68
9:45 2.1 0.44 0.15 N/A 0.2916 0.5586 502.72
10:00
2.2 0.46 0.15 N/A 0.3148 0.6030 542.73
10:15 1.5 0.32 0.15 N/A 0.1696 0.3250 292.48
10:30 1.5 0.32 0.14 N/A 0.1718 0.3290 296.14
10:45 2 0.42 0.14 N/A 0.2791 0.5346 481.15
11:00
2 0.42 0.14 N/A 0.2811 0.5386 484.74
11:15 1.9 0.40 0.14 N/A 0.2621 0.5022 452.01
11:30 1.9 0.40 0.14 N/A 0.2642 0.5061 455.51
11:45 1.7 0.36 0.13 N/A 0.2241 0.4294 386.43
12:00
1.8 0.38 0.13 N/A 0.2471 0.4735 426.14
12:15 2.5 0.53 0.13 N/A 0.3964 0.7594 683.48
12:30 2.6 0.55 0.13 N/A 0.4194 0.8035 723.11
12:45 2.8 0.59 0.13 N/A 0.4634 0.8878 798.98
6 of 6
13:00
2.9 0.61 0.12 N/A 0.4863 0.9317 838.53
13:15 3.4 0.72 0.12 N/A 0.5934 1.1368 1023.15
13:30 3.4 0.72 0.12 N/A
0.5952 1.1404 1026.34
13:45 2.3 0.48 0.12 N/A 0.3656 0.7005 630.43
14:00
2.3 0.48 0.12 N/A 0.3674 0.7039 633.54
14:15 2.7 0.57 0.11 N/A 0.4534 0.8686 781.72
14:30 2.6 0.55 0.11 N/A 0.4341 0.8316 748.46
14:45 2.6 0.55 0.11 N/A 0.4358 0.8349 751.44
15:00
2.5 0.53 0.11 N/A 0.4165 0.7979 718.10
15:15 2.4 0.50 0.11 N/A 0.3971 0.7608 684.71
15:30 2.3 0.48 0.11 N/A 0.3777 0.7236 651.27
15:45 1.9 0.40 0.10 N/A 0.2952 0.5655 508.96
16:00
1.9 0.40 0.10 N/A 0.2968 0.5686 511.71
16:15 0.4 0.08 0.10 0.08 0.0084 0.0161 14.51
16:30 0.4 0.08 0.10 0.08 0.0084 0.0161 14.51
16:45 0.3 0.06 0.10 0.06 0.0063 0.0121 10.88
17:00
0.3 0.06 0.10 0.06 0.0063 0.0121 10.88
17:15 0.5 0.11 0.10 0.09 0.0105 0.0202 18.14
17:30 0.5 0.11 0.09 N/A 0.0112 0.0215 19.33
17:45 0.5 0.11 0.09 N/A 0.0126 0.0242 21.74
18:00
0.4 0.08 0.09 0.08 0.0084 0.0161 14.51
18:15 0.4 0.08 0.09 0.08 0.0084 0.0161 14.51
18:30 0.4 0.08 0.09 0.08 0.0084 0.0161 14.51
18:45 0.3 0.06 0.09 0.06 0.0063 0.0121 10.88
19:00
0.2 0.04 0.09 0.04 0.0042 0.0081 7.26
19:15 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
19:30 0.4 0.08 0.08 0.08 0.0084 0.0161 14.51
19:45 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
20:00
0.2 0.04 0.08 0.04 0.0042 0.0081 7.26
20:15 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
20:30 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
20:45 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
21:00
0.2 0.04 0.08 0.04 0.0042 0.0081 7.26
21:15 0.3 0.06 0.08 0.06 0.0063 0.0121 10.88
21:30 0.2 0.04 0.08 0.04 0.0042 0.0081 7.26
21:45 0.3 0.06 0.07 0.06 0.0063 0.0121 10.88
22:00
0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
22:15 0.3 0.06 0.07 0.06 0.0063 0.0121 10.88
22:30 0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
22:45 0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
23:00
0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
23:15 0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
23:30 0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
23:45 0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
24:00
0.2 0.04 0.07 0.04 0.0042 0.0081 7.26
0 0.00 0.07 0.00 0.0000 0.0000 0.00
Total volume (cf) 19572.64
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T2
Drainage Area (ac.) 1.1700
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
90 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.14 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 0.0001
s.f.
Bot. = 0.0001 s.f. Max. Depth (d)= 0.0001 Max. storage= 0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 3.7 0.8569 0.1406 N/A 0.7163 0.8451 253.52
0:10 4.8 1.1117 0.1406 N/A 0.9711 1.1456 343.69
0:15 5.1 1.1812 0.1406 N/A 1.0406 1.2276 368.28
0:20 4.9 1.1348 0.1406 N/A 0.9942 1.1730 351.89
0:25 6.6 1.5286 0.1406 N/A 1.3880 1.6374 491.23
0:30 7.3 1.6907 0.1406 N/A 1.5501 1.8287 548.61
0:35 8.4 1.9454 0.1406 N/A 1.8048 2.1293 638.78
0:40 9 2.0844 0.1406 N/A 1.9438 2.2932 687.96
0:45 12.3 2.8487 0.1406 N/A 2.7081 3.1949 958.46
0:50 17.6 4.0762 0.1406 N/A
3.9356 4.6430 1392.89
0:55 16.1 3.7288 0.1406 N/A 3.5882 4.2331 1269.94
1:00
4.2 0.9727 0.1406 N/A 0.8321 0.9817 294.51
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
1:15 0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
Total volume (cf) 7599.76
2 of 6
3 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 1.3 0.42 0.14 N/A 0.2806 0.3310 99.31
0:10 1.3 0.42 0.14 N/A 0.2806 0.3310 99.31
0:15 1.1 0.36 0.14 N/A 0.2158 0.2546 76.38
0:20 1.5 0.49 0.14 N/A 0.3454 0.4075 122.25
0:25 1.5 0.49 0.14 N/A 0.3454 0.4075 122.25
0:30 1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
0:35 1.5 0.49 0.14 N/A 0.3454 0.4075 122.25
0:40 1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
0:45 1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
0:50 1.5 0.49 0.14 N/A 0.3454 0.4075 122.25
0:55 1.6 0.52 0.14 N/A 0.3778 0.4457 133.71
1:00
1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
1:05 2.2 0.71 0.14 N/A 0.5722 0.6751 202.52
1:10 2.2 0.71 0.14 N/A 0.5722 0.6751 202.52
1:15 2.2 0.71 0.14 N/A 0.5722 0.6751 202.52
1:20 2 0.65 0.14 N/A 0.5074 0.5986 179.58
1:25 2.6 0.84 0.14 N/A 0.7018 0.8279 248.38
1:30 2.7 0.87 0.14 N/A 0.7342 0.8662 259.85
1:35 2.4 0.78 0.14 N/A 0.6370 0.7515 225.45
1:40 2.7 0.87 0.14 N/A 0.7342 0.8662 259.85
1:45 3.3 1.07 0.14 N/A 0.9286 1.0955 328.65
1:50 3.1 1.00 0.14 N/A 0.8638 1.0191 305.72
1:55 2.9 0.94 0.14 N/A 0.7990 0.9426 282.79
2:00
3 0.97 0.14 N/A 0.8314 0.9808 294.25
2:05 3.1 1.00 0.14 N/A 0.8638 1.0191 305.72
2:10 4.2 1.36 0.14 N/A 1.2202 1.4395 431.86
2:15 5 1.62 0.14 N/A 1.4794 1.7453 523.60
2:20 3.5 1.13 0.14 N/A 0.9934 1.1720 351.59
2:25 6.8 2.20 0.14 N/A 2.0626 2.4334 730.01
2:30 7.3 2.37 0.14 N/A 2.2246 2.6245 787.34
2:35 8.2 2.66 0.14 N/A
2.5162 2.9685 890.55
2:40 5.9 1.91 0.14 N/A 1.7710 2.0893 626.80
2:45 2 0.65 0.14 N/A 0.5074 0.5986 179.58
2:50 1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
2:55 1.8 0.58 0.14 N/A 0.4426 0.5222 156.65
3:00
0.6 0.19 0.14 N/A 0.0538 0.0635 19.04
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 9675.74
3 of 6
6 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 0.5 0.21 0.14 N/A 0.0688 0.0812 24.35
0:10 0.6 0.25 0.14 N/A 0.1107 0.1306 39.17
0:15 0.6 0.25 0.14 N/A 0.1107 0.1306 39.17
0:20 0.6 0.25 0.14 N/A 0.1107 0.1306 39.17
0:25 0.6 0.25 0.14 N/A 0.1107 0.1306 39.17
0:30 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
0:35 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
0:40 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
0:45 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
0:50 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
0:55 0.7 0.29 0.14 N/A 0.1526 0.1800 53.99
1:00
0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:05 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:10 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:15 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:20 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:25 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:30 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:35 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:40 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:45 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:50 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
1:55 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
2:00
0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:05 0.8 0.34 0.14 N/A 0.1944 0.2294 68.82
2:10 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:15 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:20 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:25 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:30 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:35 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:40 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
2:45 1 0.42 0.14 N/A 0.2782 0.3282 98.46
2:50 1 0.42 0.14 N/A 0.2782 0.3282 98.46
2:55 1 0.42 0.14 N/A 0.2782 0.3282 98.46
3:00
1 0.42 0.14 N/A 0.2782 0.3282 98.46
3:05 1 0.42 0.14 N/A 0.2782 0.3282 98.46
3:10 1.1 0.46 0.14 N/A 0.3201 0.3776 113.28
3:15 1.1 0.46 0.14 N/A 0.3201 0.3776 113.28
3:20 1.1 0.46 0.14 N/A 0.3201 0.3776 113.28
3:25 1.2 0.50 0.14 N/A 0.3620 0.4270 128.11
3:30 1.3 0.54 0.14 N/A 0.4038 0.4764 142.93
3:35 1.4 0.59 0.14 N/A 0.4457 0.5258 157.75
3:40 1.4 0.59 0.14 N/A 0.4457 0.5258 157.75
3:45 1.5 0.63 0.14 N/A 0.4876 0.5752 172.57
3:50 1.5 0.63 0.14 N/A 0.4876 0.5752 172.57
3:55 1.6 0.67 0.14 N/A 0.5295 0.6247 187.40
4:00
1.6 0.67 0.14 N/A 0.5295 0.6247 187.40
4:05 1.7 0.71 0.14 N/A 0.5714 0.6741 202.22
4:10 1.8 0.75 0.14 N/A 0.6132 0.7235 217.04
4:15 1.9 0.80 0.14 N/A 0.6551 0.7729 231.86
4 of 6
4:20 2 0.84 0.14 N/A 0.6970 0.8223 246.69
4:25 2.1 0.88 0.14 N/A 0.7389 0.8717 261.51
4:30 2.1 0.88 0.14 N/A 0.7389 0.8717 261.51
4:35 2.2 0.92 0.14 N/A 0.7808 0.9211 276.33
4:40 2.3 0.96 0.14 N/A 0.8226 0.9705 291.15
4:45 2.4 1.01 0.14 N/A 0.8645 1.0199 305.98
4:50 2.4 1.01 0.14 N/A 0.8645 1.0199 305.98
4:55 2.5 1.05 0.14 N/A 0.9064 1.0693 320.80
5:00
2.6 1.09 0.14 N/A 0.9483 1.1187 335.62
5:05 3.1 1.30 0.14 N/A 1.1577 1.3658 409.73
5:10 3.6 1.51 0.14 N/A 1.3671 1.6128 483.84
5:15 3.9 1.63 0.14 N/A 1.4927 1.7610 528.31
5:20 4.2 1.76 0.14 N/A 1.6184 1.9093 572.78
5:25 4.7 1.97 0.14 N/A 1.8278 2.1563 646.89
5:30 5.6 2.35 0.14 N/A
2.2047 2.6010 780.29
5:35 1.9 0.80 0.14 N/A 0.6551 0.7729 231.86
5:40 0.9 0.38 0.14 N/A 0.2363 0.2788 83.64
5:45 0.6 0.25 0.14 N/A 0.1107 0.1306 39.17
5:50 0.5 0.21 0.14 N/A 0.0688 0.0812 24.35
5:55 0.3 0.13 0.14 0.11 0.0126 0.0148 4.45
6:00
0.2 0.08 0.14 0.08 0.0084 0.0099 2.96
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:45 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
7:00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 11272.35
5 of 6
24 Hour Storm in 15 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:15 0.2 0.04 0.25 0.04 0.0042 0.0050 4.47
0:30 0.3 0.06 0.24 0.06 0.0063 0.0074 6.70
0:45 0.3 0.06 0.24 0.06 0.0063 0.0074 6.70
1:00
0.4 0.08 0.24 0.08 0.0084 0.0099 8.94
1:15 0.3 0.06 0.24 0.06 0.0063 0.0074 6.70
1:30 0.3 0.06 0.23 0.06 0.0063 0.0074 6.70
1:45 0.3 0.06 0.23 0.06 0.0063 0.0074 6.70
2:00
0.4 0.08 0.23 0.08 0.0084 0.0099 8.94
2:15 0.4 0.08 0.22 0.08 0.0084 0.0099 8.94
2:30 0.4 0.08 0.22 0.08 0.0084 0.0099 8.94
2:45 0.5 0.11 0.22 0.09 0.0105 0.0124 11.17
3:00
0.5 0.11 0.22 0.09 0.0105 0.0124 11.17
3:15 0.5 0.11 0.21 0.09 0.0105 0.0124 11.17
3:30 0.5 0.11 0.21 0.09 0.0105 0.0124 11.17
3:45 0.5 0.11 0.21 0.09 0.0105 0.0124 11.17
4:00
0.6 0.13 0.21 0.11 0.0126 0.0149 13.40
4:15 0.6 0.13 0.20 0.11 0.0126 0.0149 13.40
4:30 0.7 0.15 0.20 0.13 0.0147 0.0174 15.64
4:45 0.7 0.15 0.20 0.13 0.0147 0.0174 15.64
5:00
0.8 0.17 0.20 0.15 0.0168 0.0199 17.87
5:15 0.6 0.13 0.19 0.11 0.0126 0.0149 13.40
5:30 0.7 0.15 0.19 0.13 0.0147 0.0174 15.64
5:45 0.8 0.17 0.19 0.15 0.0168 0.0199 17.87
6:00
0.8 0.17 0.19 0.15 0.0168 0.0199 17.87
6:15 0.9 0.19 0.18 0.17 0.0189 0.0223 20.11
6:30 0.9 0.19 0.18 0.17 0.0189 0.0223 20.11
6:45 1 0.21 0.18 N/A 0.0326 0.0384 34.57
7:00
1 0.21 0.18 N/A 0.0350 0.0412 37.12
7:15 1 0.21 0.17 N/A 0.0373 0.0441 39.66
7:30 1.1 0.23 0.17 N/A 0.0608 0.0717 64.51
7:45 1.2 0.25 0.17 N/A 0.0841 0.0993 89.34
8:00
1.3 0.27 0.17 N/A 0.1075 0.1268 114.15
8:15 1.5 0.32 0.16 N/A 0.1519 0.1792 161.28
8:30 1.5 0.32 0.16 N/A 0.1542 0.1819 163.71
8:45 1.6 0.34 0.16 N/A 0.1775 0.2094 188.46
9:00
1.7 0.36 0.16 N/A 0.2008 0.2369 213.19
9:15 1.9 0.40 0.15 N/A 0.2451 0.2891 260.23
9:30 2 0.42 0.15 N/A 0.2683 0.3166 284.91
9:45 2.1 0.44 0.15 N/A 0.2916 0.3440 309.57
10:00
2.2 0.46 0.15 N/A 0.3148 0.3713 334.21
10:15 1.5 0.32 0.15 N/A 0.1696 0.2001 180.11
10:30 1.5 0.32 0.14 N/A 0.1718 0.2026 182.36
10:45 2 0.42 0.14 N/A 0.2791 0.3292 296.29
11:00
2 0.42 0.14 N/A 0.2811 0.3317 298.50
11:15 1.9 0.40 0.14 N/A 0.2621 0.3093 278.34
11:30 1.9 0.40 0.14 N/A 0.2642 0.3117 280.50
11:45 1.7 0.36 0.13 N/A 0.2241 0.2644 237.96
12:00
1.8 0.38 0.13 N/A 0.2471 0.2916 262.41
12:15 2.5 0.53 0.13 N/A 0.3964 0.4676 420.88
12:30 2.6 0.55 0.13 N/A 0.4194 0.4948 445.28
12:45 2.8 0.59 0.13 N/A 0.4634 0.5467 492.00
6 of 6
13:00
2.9 0.61 0.12 N/A 0.4863 0.5737 516.36
13:15 3.4 0.72 0.12 N/A 0.5934 0.7001 630.05
13:30 3.4 0.72 0.12 N/A
0.5952
0.7022
632.01
13:45 2.3 0.48 0.12 N/A 0.3656 0.4313 388.21
14:00
2.3 0.48 0.12 N/A 0.3674 0.4335 390.13
14:15 2.7 0.57 0.11 N/A 0.4534 0.5349 481.37
14:30 2.6 0.55 0.11 N/A 0.4341 0.5121 460.89
14:45 2.6 0.55 0.11 N/A 0.4358 0.5141 462.73
15:00
2.5 0.53 0.11 N/A 0.4165 0.4913 442.20
15:15 2.4 0.50 0.11 N/A 0.3971 0.4685 421.64
15:30 2.3 0.48 0.11 N/A 0.3777 0.4456 401.05
15:45 1.9 0.40 0.10 N/A 0.2952 0.3482 313.41
16:00
1.9 0.40 0.10 N/A 0.2968 0.3501 315.11
16:15 0.4 0.08 0.10 0.08 0.0084 0.0099 8.94
16:30 0.4 0.08 0.10 0.08 0.0084 0.0099 8.94
16:45 0.3 0.06 0.10 0.06 0.0063 0.0074 6.70
17:00
0.3 0.06 0.10 0.06 0.0063 0.0074 6.70
17:15 0.5 0.11 0.10 0.09 0.0105 0.0124 11.17
17:30 0.5 0.11 0.09 N/A 0.0112 0.0132 11.90
17:45 0.5 0.11 0.09 N/A 0.0126 0.0149 13.39
18:00
0.4 0.08 0.09 0.08 0.0084 0.0099 8.94
18:15 0.4 0.08 0.09 0.08 0.0084 0.0099 8.94
18:30 0.4 0.08 0.09 0.08 0.0084 0.0099 8.94
18:45 0.3 0.06 0.09 0.06 0.0063 0.0074 6.70
19:00
0.2 0.04 0.09 0.04 0.0042 0.0050 4.47
19:15 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
19:30 0.4 0.08 0.08 0.08 0.0084 0.0099 8.94
19:45 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
20:00
0.2 0.04 0.08 0.04 0.0042 0.0050 4.47
20:15 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
20:30 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
20:45 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
21:00
0.2 0.04 0.08 0.04 0.0042 0.0050 4.47
21:15 0.3 0.06 0.08 0.06 0.0063 0.0074 6.70
21:30 0.2 0.04 0.08 0.04 0.0042 0.0050 4.47
21:45 0.3 0.06 0.07 0.06 0.0063 0.0074 6.70
22:00
0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
22:15 0.3 0.06 0.07 0.06 0.0063 0.0074 6.70
22:30 0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
22:45 0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
23:00
0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
23:15 0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
23:30 0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
23:45 0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
24:00
0.2 0.04 0.07 0.04 0.0042 0.0050 4.47
0 0.00 0.07 0.00 0.0000 0.0000 0.00
Total volume (cf) 12052.63
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T3
Drainage Area (ac.) 1.8700
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
90 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.14 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 0.0001
s.f.
Bot. = 0.0001 s.f. Max. Depth (d)= 0.0001 Max. storage= 0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 3.7 0.8569 0.1406 N/A 0.7163 1.3507 405.20
0:10 4.8 1.1117 0.1406 N/A 0.9711 1.8311 549.32
0:15 5.1 1.1812 0.1406 N/A 1.0406 1.9621 588.62
0:20 4.9 1.1348 0.1406 N/A 0.9942 1.8747 562.42
0:25 6.6 1.5286 0.1406 N/A 1.3880 2.6171 785.13
0:30 7.3 1.6907 0.1406 N/A 1.5501 2.9228 876.84
0:35 8.4 1.9454 0.1406 N/A 1.8048 3.4032 1020.95
0:40 9 2.0844 0.1406 N/A 1.9438 3.6652 1099.56
0:45 12.3 2.8487 0.1406 N/A 2.7081 5.1063 1531.89
0:50 17.6 4.0762 0.1406 N/A
3.9356 7.4208 2226.25
0:55 16.1 3.7288 0.1406 N/A 3.5882 6.7658 2029.73
1:00
4.2 0.9727 0.1406 N/A 0.8321 1.5690 470.71
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
1:15 0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
Total volume (cf) 12146.63
2 of 6
3 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 1.3 0.42 0.14 N/A 0.2806 0.5291 158.73
0:10 1.3 0.42 0.14 N/A 0.2806 0.5291 158.73
0:15 1.1 0.36 0.14 N/A 0.2158 0.4069 122.07
0:20 1.5 0.49 0.14 N/A 0.3454 0.6513 195.38
0:25 1.5 0.49 0.14 N/A 0.3454 0.6513 195.38
0:30 1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
0:35 1.5 0.49 0.14 N/A 0.3454 0.6513 195.38
0:40 1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
0:45 1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
0:50 1.5 0.49 0.14 N/A 0.3454 0.6513 195.38
0:55 1.6 0.52 0.14 N/A 0.3778 0.7124 213.71
1:00
1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
1:05 2.2 0.71 0.14 N/A 0.5722 1.0789 323.68
1:10 2.2 0.71 0.14 N/A 0.5722 1.0789 323.68
1:15 2.2 0.71 0.14 N/A 0.5722 1.0789 323.68
1:20 2 0.65 0.14 N/A 0.5074 0.9567 287.02
1:25 2.6 0.84 0.14 N/A 0.7018 1.3233 396.99
1:30 2.7 0.87 0.14 N/A 0.7342 1.3844 415.32
1:35 2.4 0.78 0.14 N/A 0.6370 1.2011 360.33
1:40 2.7 0.87 0.14 N/A 0.7342 1.3844 415.32
1:45 3.3 1.07 0.14 N/A 0.9286 1.7510 525.29
1:50 3.1 1.00 0.14 N/A 0.8638 1.6288 488.63
1:55 2.9 0.94 0.14 N/A 0.7990 1.5066 451.97
2:00
3 0.97 0.14 N/A 0.8314 1.5677 470.30
2:05 3.1 1.00 0.14 N/A 0.8638 1.6288 488.63
2:10 4.2 1.36 0.14 N/A 1.2202 2.3008 690.24
2:15 5 1.62 0.14 N/A 1.4794 2.7895 836.86
2:20 3.5 1.13 0.14 N/A 0.9934 1.8731 561.94
2:25 6.8 2.20 0.14 N/A 2.0626 3.8892 1166.76
2:30 7.3 2.37 0.14 N/A 2.2246 4.1947 1258.40
2:35 8.2 2.66 0.14 N/A
2.5162 4.7445 1423.35
2:40 5.9 1.91 0.14 N/A 1.7710 3.3394 1001.81
2:45 2 0.65 0.14 N/A 0.5074 0.9567 287.02
2:50 1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
2:55 1.8 0.58 0.14 N/A 0.4426 0.8346 250.37
3:00
0.6 0.19 0.14 N/A 0.0538 0.1014 30.43
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 15464.65
3 of 6
6 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 0.5 0.21 0.14 N/A 0.0688 0.1297 38.92
0:10 0.6 0.25 0.14 N/A 0.1107 0.2087 62.61
0:15 0.6 0.25 0.14 N/A 0.1107 0.2087 62.61
0:20 0.6 0.25 0.14 N/A 0.1107 0.2087 62.61
0:25 0.6 0.25 0.14 N/A 0.1107 0.2087 62.61
0:30 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
0:35 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
0:40 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
0:45 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
0:50 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
0:55 0.7 0.29 0.14 N/A 0.1526 0.2877 86.30
1:00
0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:05 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:10 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:15 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:20 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:25 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:30 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:35 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:40 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:45 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:50 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
1:55 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
2:00
0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:05 0.8 0.34 0.14 N/A 0.1944 0.3666 109.99
2:10 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:15 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:20 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:25 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:30 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:35 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:40 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
2:45 1 0.42 0.14 N/A 0.2782 0.5246 157.37
2:50 1 0.42 0.14 N/A 0.2782 0.5246 157.37
2:55 1 0.42 0.14 N/A 0.2782 0.5246 157.37
3:00
1 0.42 0.14 N/A 0.2782 0.5246 157.37
3:05 1 0.42 0.14 N/A 0.2782 0.5246 157.37
3:10 1.1 0.46 0.14 N/A 0.3201 0.6035 181.06
3:15 1.1 0.46 0.14 N/A 0.3201 0.6035 181.06
3:20 1.1 0.46 0.14 N/A 0.3201 0.6035 181.06
3:25 1.2 0.50 0.14 N/A 0.3620 0.6825 204.75
3:30 1.3 0.54 0.14 N/A 0.4038 0.7615 228.44
3:35 1.4 0.59 0.14 N/A 0.4457 0.8404 252.13
3:40 1.4 0.59 0.14 N/A 0.4457 0.8404 252.13
3:45 1.5 0.63 0.14 N/A 0.4876 0.9194 275.82
3:50 1.5 0.63 0.14 N/A 0.4876 0.9194 275.82
3:55 1.6 0.67 0.14 N/A 0.5295 0.9984 299.51
4:00
1.6 0.67 0.14 N/A 0.5295 0.9984 299.51
4:05 1.7 0.71 0.14 N/A 0.5714 1.0773 323.20
4:10 1.8 0.75 0.14 N/A 0.6132 1.1563 346.89
4:15 1.9 0.80 0.14 N/A 0.6551 1.2353 370.59
4 of 6
4:20 2 0.84 0.14 N/A 0.6970 1.3143 394.28
4:25 2.1 0.88 0.14 N/A 0.7389 1.3932 417.97
4:30 2.1 0.88 0.14 N/A 0.7389 1.3932 417.97
4:35 2.2 0.92 0.14 N/A 0.7808 1.4722 441.66
4:40 2.3 0.96 0.14 N/A 0.8226 1.5512 465.35
4:45 2.4 1.01 0.14 N/A 0.8645 1.6301 489.04
4:50 2.4 1.01 0.14 N/A 0.8645 1.6301 489.04
4:55 2.5 1.05 0.14 N/A 0.9064 1.7091 512.73
5:00
2.6 1.09 0.14 N/A 0.9483 1.7881 536.42
5:05 3.1 1.30 0.14 N/A 1.1577 2.1829 654.87
5:10 3.6 1.51 0.14 N/A 1.3671 2.5777 773.32
5:15 3.9 1.63 0.14 N/A 1.4927 2.8146 844.39
5:20 4.2 1.76 0.14 N/A 1.6184 3.0516 915.47
5:25 4.7 1.97 0.14 N/A 1.8278 3.4464 1033.92
5:30 5.6 2.35 0.14 N/A
2.2047 4.1571 1247.13
5:35 1.9 0.80 0.14 N/A 0.6551 1.2353 370.59
5:40 0.9 0.38 0.14 N/A 0.2363 0.4456 133.68
5:45 0.6 0.25 0.14 N/A 0.1107 0.2087 62.61
5:50 0.5 0.21 0.14 N/A 0.0688 0.1297 38.92
5:55 0.3 0.13 0.14 0.11 0.0126 0.0237 7.11
6:00
0.2 0.08 0.14 0.08 0.0084 0.0158 4.74
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:45 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
7:00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 18016.49
5 of 6
24 Hour Storm in 15 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:15 0.2 0.04 0.25 0.04 0.0042 0.0079 7.14
0:30 0.3 0.06 0.24 0.06 0.0063 0.0119 10.71
0:45 0.3 0.06 0.24 0.06 0.0063 0.0119 10.71
1:00
0.4 0.08 0.24 0.08 0.0084 0.0159 14.28
1:15 0.3 0.06 0.24 0.06 0.0063 0.0119 10.71
1:30 0.3 0.06 0.23 0.06 0.0063 0.0119 10.71
1:45 0.3 0.06 0.23 0.06 0.0063 0.0119 10.71
2:00
0.4 0.08 0.23 0.08 0.0084 0.0159 14.28
2:15 0.4 0.08 0.22 0.08 0.0084 0.0159 14.28
2:30 0.4 0.08 0.22 0.08 0.0084 0.0159 14.28
2:45 0.5 0.11 0.22 0.09 0.0105 0.0198 17.85
3:00
0.5 0.11 0.22 0.09 0.0105 0.0198 17.85
3:15 0.5 0.11 0.21 0.09 0.0105 0.0198 17.85
3:30 0.5 0.11 0.21 0.09 0.0105 0.0198 17.85
3:45 0.5 0.11 0.21 0.09 0.0105 0.0198 17.85
4:00
0.6 0.13 0.21 0.11 0.0126 0.0238 21.42
4:15 0.6 0.13 0.20 0.11 0.0126 0.0238 21.42
4:30 0.7 0.15 0.20 0.13 0.0147 0.0278 24.99
4:45 0.7 0.15 0.20 0.13 0.0147 0.0278 24.99
5:00
0.8 0.17 0.20 0.15 0.0168 0.0317 28.56
5:15 0.6 0.13 0.19 0.11 0.0126 0.0238 21.42
5:30 0.7 0.15 0.19 0.13 0.0147 0.0278 24.99
5:45 0.8 0.17 0.19 0.15 0.0168 0.0317 28.56
6:00
0.8 0.17 0.19 0.15 0.0168 0.0317 28.56
6:15 0.9 0.19 0.18 0.17 0.0189 0.0357 32.13
6:30 0.9 0.19 0.18 0.17 0.0189 0.0357 32.13
6:45 1 0.21 0.18 N/A 0.0326 0.0614 55.25
7:00
1 0.21 0.18 N/A 0.0350 0.0659 59.33
7:15 1 0.21 0.17 N/A 0.0373 0.0704 63.38
7:30 1.1 0.23 0.17 N/A 0.0608 0.1146 103.11
7:45 1.2 0.25 0.17 N/A 0.0841 0.1587 142.79
8:00
1.3 0.27 0.17 N/A 0.1075 0.2027 182.45
8:15 1.5 0.32 0.16 N/A 0.1519 0.2864 257.78
8:30 1.5 0.32 0.16 N/A 0.1542 0.2907 261.66
8:45 1.6 0.34 0.16 N/A 0.1775 0.3347 301.21
9:00
1.7 0.36 0.16 N/A 0.2008 0.3786 340.73
9:15 1.9 0.40 0.15 N/A 0.2451 0.4621 415.92
9:30 2 0.42 0.15 N/A 0.2683 0.5060 455.37
9:45 2.1 0.44 0.15 N/A 0.2916 0.5498 494.79
10:00
2.2 0.46 0.15 N/A 0.3148 0.5935 534.17
10:15 1.5 0.32 0.15 N/A 0.1696 0.3198 287.86
10:30 1.5 0.32 0.14 N/A 0.1718 0.3239 291.47
10:45 2 0.42 0.14 N/A 0.2791 0.5262 473.56
11:00
2 0.42 0.14 N/A 0.2811 0.5301 477.08
11:15 1.9 0.40 0.14 N/A 0.2621 0.4943 444.87
11:30 1.9 0.40 0.14 N/A 0.2642 0.4981 448.32
11:45 1.7 0.36 0.13 N/A 0.2241 0.4226 380.33
12:00
1.8 0.38 0.13 N/A 0.2471 0.4660 419.41
12:15 2.5 0.53 0.13 N/A 0.3964 0.7474 672.69
12:30 2.6 0.55 0.13 N/A 0.4194 0.7908 711.69
12:45 2.8 0.59 0.13 N/A 0.4634 0.8737 786.36
6 of 6
13:00
2.9 0.61 0.12 N/A 0.4863 0.9170 825.29
13:15 3.4 0.72 0.12 N/A 0.5934 1.1189 1007.00
13:30 3.4 0.72 0.12 N/A
0.5952
1.1224
1010.14
13:45 2.3 0.48 0.12 N/A 0.3656 0.6894 620.48
14:00
2.3 0.48 0.12 N/A 0.3674 0.6928 623.54
14:15 2.7 0.57 0.11 N/A 0.4534 0.8549 769.37
14:30 2.6 0.55 0.11 N/A 0.4341 0.8185 736.64
14:45 2.6 0.55 0.11 N/A 0.4358 0.8217 739.57
15:00
2.5 0.53 0.11 N/A 0.4165 0.7853 706.76
15:15 2.4 0.50 0.11 N/A 0.3971 0.7488 673.90
15:30 2.3 0.48 0.11 N/A 0.3777 0.7122 640.99
15:45 1.9 0.40 0.10 N/A 0.2952 0.5566 500.92
16:00
1.9 0.40 0.10 N/A 0.2968 0.5596 503.63
16:15 0.4 0.08 0.10 0.08 0.0084 0.0159 14.28
16:30 0.4 0.08 0.10 0.08 0.0084 0.0159 14.28
16:45 0.3 0.06 0.10 0.06 0.0063 0.0119 10.71
17:00
0.3 0.06 0.10 0.06 0.0063 0.0119 10.71
17:15 0.5 0.11 0.10 0.09 0.0105 0.0198 17.85
17:30 0.5 0.11 0.09 N/A 0.0112 0.0211 19.02
17:45 0.5 0.11 0.09 N/A 0.0126 0.0238 21.39
18:00
0.4 0.08 0.09 0.08 0.0084 0.0159 14.28
18:15 0.4 0.08 0.09 0.08 0.0084 0.0159 14.28
18:30 0.4 0.08 0.09 0.08 0.0084 0.0159 14.28
18:45 0.3 0.06 0.09 0.06 0.0063 0.0119 10.71
19:00
0.2 0.04 0.09 0.04 0.0042 0.0079 7.14
19:15 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
19:30 0.4 0.08 0.08 0.08 0.0084 0.0159 14.28
19:45 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
20:00
0.2 0.04 0.08 0.04 0.0042 0.0079 7.14
20:15 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
20:30 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
20:45 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
21:00
0.2 0.04 0.08 0.04 0.0042 0.0079 7.14
21:15 0.3 0.06 0.08 0.06 0.0063 0.0119 10.71
21:30 0.2 0.04 0.08 0.04 0.0042 0.0079 7.14
21:45 0.3 0.06 0.07 0.06 0.0063 0.0119 10.71
22:00
0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
22:15 0.3 0.06 0.07 0.06 0.0063 0.0119 10.71
22:30 0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
22:45 0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
23:00
0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
23:15 0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
23:30 0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
23:45 0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
24:00
0.2 0.04 0.07 0.04 0.0042 0.0079 7.14
0 0.00 0.07 0.00 0.0000 0.0000 0.00
Total volume (cf) 19263.60
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T4
Drainage Area (ac.) 3.3000
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
87.3 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.16 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 0.0001
s.f.
Bot. = 0.0001 s.f. Max. Depth (d)= 0.0001 Max. storage= 0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 3.7 0.8569 0.1586 N/A 0.6983 2.3237 697.12
0:10 4.8 1.1117 0.1586 N/A 0.9531 3.1714 951.43
0:15 5.1 1.1812 0.1586 N/A 1.0226 3.4026 1020.79
0:20 4.9 1.1348 0.1586 N/A 0.9763 3.2485 974.55
0:25 6.6 1.5286 0.1586 N/A 1.3700 4.5586 1367.58
0:30 7.3 1.6907 0.1586 N/A 1.5321 5.0981 1529.42
0:35 8.4 1.9454 0.1586 N/A 1.7869 5.9458 1783.73
0:40 9 2.0844 0.1586 N/A 1.9258 6.4082 1922.45
0:45 12.3 2.8487 0.1586 N/A 2.6901 8.9513 2685.39
0:50 17.6 4.0762 0.1586 N/A
3.9176 13.0357 3910.72
0:55 16.1 3.7288 0.1586 N/A 3.5702 11.8798 3563.93
1:00
4.2 0.9727 0.1586 N/A 0.8141 2.7090 812.71
0 0.0000 0.1586 0.00 0.0000 0.0000 0.00
0 0.0000 0.1586 0.00 0.0000 0.0000 0.00
1:15 0 0.0000 0.1586 0.00 0.0000 0.0000 0.00
Total volume (cf) 21219.82
2 of 6
3 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 1.3 0.42 0.16 N/A 0.2626 0.8739 262.16
0:10 1.3 0.42 0.16 N/A 0.2626 0.8739 262.16
0:15 1.1 0.36 0.16 N/A 0.1978 0.6582 197.47
0:20 1.5 0.49 0.16 N/A 0.3274 1.0895 326.85
0:25 1.5 0.49 0.16 N/A 0.3274 1.0895 326.85
0:30 1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
0:35 1.5 0.49 0.16 N/A 0.3274 1.0895 326.85
0:40 1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
0:45 1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
0:50 1.5 0.49 0.16 N/A 0.3274 1.0895 326.85
0:55 1.6 0.52 0.16 N/A 0.3598 1.1973 359.19
1:00
1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
1:05 2.2 0.71 0.16 N/A 0.5542 1.8442 553.25
1:10 2.2 0.71 0.16 N/A 0.5542 1.8442 553.25
1:15 2.2 0.71 0.16 N/A 0.5542 1.8442 553.25
1:20 2 0.65 0.16 N/A 0.4894 1.6285 488.56
1:25 2.6 0.84 0.16 N/A 0.6838 2.2754 682.62
1:30 2.7 0.87 0.16 N/A 0.7162 2.3832 714.96
1:35 2.4 0.78 0.16 N/A 0.6190 2.0598 617.93
1:40 2.7 0.87 0.16 N/A 0.7162 2.3832 714.96
1:45 3.3 1.07 0.16 N/A 0.9106 3.0301 909.02
1:50 3.1 1.00 0.16 N/A 0.8458 2.8145 844.34
1:55 2.9 0.94 0.16 N/A 0.7810 2.5988 779.65
2:00
3 0.97 0.16 N/A 0.8134 2.7066 811.99
2:05 3.1 1.00 0.16 N/A 0.8458 2.8145 844.34
2:10 4.2 1.36 0.16 N/A 1.2022 4.0004 1200.11
2:15 5 1.62 0.16 N/A 1.4614 4.8629 1458.86
2:20 3.5 1.13 0.16 N/A 0.9754 3.2457 973.71
2:25 6.8 2.20 0.16 N/A 2.0446 6.8035 2041.04
2:30 7.3 2.37 0.16 N/A 2.2066 7.3425 2202.76
2:35 8.2 2.66 0.16 N/A
2.4982 8.3128 2493.85
2:40 5.9 1.91 0.16 N/A 1.7530 5.8332 1749.95
2:45 2 0.65 0.16 N/A 0.4894 1.6285 488.56
2:50 1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
2:55 1.8 0.58 0.16 N/A 0.4246 1.4129 423.87
3:00
0.6 0.19 0.16 N/A 0.0358 0.1192 35.76
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
3:15 0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
3:30 0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
Total volume (cf) 26644.34
3 of 6
6 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 0.5 0.21 0.16 N/A 0.0508 0.1691 50.73
0:10 0.6 0.25 0.16 N/A 0.0927 0.3085 92.54
0:15 0.6 0.25 0.16 N/A 0.0927 0.3085 92.54
0:20 0.6 0.25 0.16 N/A 0.0927 0.3085 92.54
0:25 0.6 0.25 0.16 N/A 0.0927 0.3085 92.54
0:30 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
0:35 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
0:40 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
0:45 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
0:50 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
0:55 0.7 0.29 0.16 N/A 0.1346 0.4478 134.34
1:00
0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:05 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:10 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:15 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:20 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:25 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:30 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:35 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:40 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:45 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:50 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
1:55 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
2:00
0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:05 0.8 0.34 0.16 N/A 0.1765 0.5872 176.15
2:10 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:15 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:20 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:25 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:30 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:35 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:40 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
2:45 1 0.42 0.16 N/A 0.2602 0.8659 259.76
2:50 1 0.42 0.16 N/A 0.2602 0.8659 259.76
2:55 1 0.42 0.16 N/A 0.2602 0.8659 259.76
3:00
1 0.42 0.16 N/A 0.2602 0.8659 259.76
3:05 1 0.42 0.16 N/A 0.2602 0.8659 259.76
3:10 1.1 0.46 0.16 N/A 0.3021 1.0052 301.57
3:15 1.1 0.46 0.16 N/A 0.3021 1.0052 301.57
3:20 1.1 0.46 0.16 N/A 0.3021 1.0052 301.57
3:25 1.2 0.50 0.16 N/A 0.3440 1.1446 343.38
3:30 1.3 0.54 0.16 N/A 0.3859 1.2839 385.18
3:35 1.4 0.59 0.16 N/A 0.4277 1.4233 426.99
3:40 1.4 0.59 0.16 N/A 0.4277 1.4233 426.99
3:45 1.5 0.63 0.16 N/A 0.4696 1.5627 468.80
3:50 1.5 0.63 0.16 N/A 0.4696 1.5627 468.80
3:55 1.6 0.67 0.16 N/A 0.5115 1.7020 510.60
4:00
1.6 0.67 0.16 N/A 0.5115 1.7020 510.60
4:05 1.7 0.71 0.16 N/A 0.5534 1.8414 552.41
4:10 1.8 0.75 0.16 N/A 0.5953 1.9807 594.22
4:15 1.9 0.80 0.16 N/A 0.6371 2.1201 636.02
4 of 6
4:20 2 0.84 0.16 N/A 0.6790 2.2594 677.83
4:25 2.1 0.88 0.16 N/A 0.7209 2.3988 719.64
4:30 2.1 0.88 0.16 N/A 0.7209 2.3988 719.64
4:35 2.2 0.92 0.16 N/A 0.7628 2.5381 761.44
4:40 2.3 0.96 0.16 N/A 0.8047 2.6775 803.25
4:45 2.4 1.01 0.16 N/A 0.8465 2.8169 845.06
4:50 2.4 1.01 0.16 N/A 0.8465 2.8169 845.06
4:55 2.5 1.05 0.16 N/A 0.8884 2.9562 886.86
5:00
2.6 1.09 0.16 N/A 0.9303 3.0956 928.67
5:05 3.1 1.30 0.16 N/A 1.1397 3.7923 1137.70
5:10 3.6 1.51 0.16 N/A 1.3491 4.4891 1346.74
5:15 3.9 1.63 0.16 N/A 1.4747 4.9072 1472.16
5:20 4.2 1.76 0.16 N/A 1.6004 5.3253 1597.58
5:25 4.7 1.97 0.16 N/A 1.8098 6.0220 1806.61
5:30 5.6 2.35 0.16 N/A
2.1867 7.2762 2182.87
5:35 1.9 0.80 0.16 N/A 0.6371 2.1201 636.02
5:40 0.9 0.38 0.16 N/A 0.2183 0.7265 217.96
5:45 0.6 0.25 0.16 N/A 0.0927 0.3085 92.54
5:50 0.5 0.21 0.16 N/A 0.0508 0.1691 50.73
5:55 0.3 0.13 0.16 0.11 0.0126 0.0418 12.54
6:00
0.2 0.08 0.16 0.08 0.0084 0.0279 8.36
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
6:15 0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
6:30 0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
6:45 0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
7:00
0 0.00 0.16 0.00 0.0000 0.0000 0.00
Total volume (cf) 30537.27
5 of 6
24 Hour Storm in 15 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:15 0.2 0.04 0.28 0.04 0.0042 0.0140 12.60
0:30 0.3 0.06 0.28 0.06 0.0063 0.0210 18.90
0:45 0.3 0.06 0.27 0.06 0.0063 0.0210 18.90
1:00
0.4 0.08 0.27 0.08 0.0084 0.0280 25.20
1:15 0.3 0.06 0.27 0.06 0.0063 0.0210 18.90
1:30 0.3 0.06 0.26 0.06 0.0063 0.0210 18.90
1:45 0.3 0.06 0.26 0.06 0.0063 0.0210 18.90
2:00
0.4 0.08 0.26 0.08 0.0084 0.0280 25.20
2:15 0.4 0.08 0.25 0.08 0.0084 0.0280 25.20
2:30 0.4 0.08 0.25 0.08 0.0084 0.0280 25.20
2:45 0.5 0.11 0.25 0.09 0.0105 0.0350 31.50
3:00
0.5 0.11 0.24 0.09 0.0105 0.0350 31.50
3:15 0.5 0.11 0.24 0.09 0.0105 0.0350 31.50
3:30 0.5 0.11 0.24 0.09 0.0105 0.0350 31.50
3:45 0.5 0.11 0.23 0.09 0.0105 0.0350 31.50
4:00
0.6 0.13 0.23 0.11 0.0126 0.0420 37.81
4:15 0.6 0.13 0.23 0.11 0.0126 0.0420 37.81
4:30 0.7 0.15 0.23 0.13 0.0147 0.0490 44.11
4:45 0.7 0.15 0.22 0.13 0.0147 0.0490 44.11
5:00
0.8 0.17 0.22 0.15 0.0168 0.0560 50.41
5:15 0.6 0.13 0.22 0.11 0.0126 0.0420 37.81
5:30 0.7 0.15 0.21 0.13 0.0147 0.0490 44.11
5:45 0.8 0.17 0.21 0.15 0.0168 0.0560 50.41
6:00
0.8 0.17 0.21 0.15 0.0168 0.0560 50.41
6:15 0.9 0.19 0.21 0.17 0.0189 0.0630 56.71
6:30 0.9 0.19 0.20 0.17 0.0189 0.0630 56.71
6:45 1 0.21 0.20 0.19 0.0210 0.0700 63.01
7:00
1 0.21 0.20 0.19 0.0210 0.0700 63.01
7:15 1 0.21 0.20 0.19 0.0210 0.0700 63.01
7:30 1.1 0.23 0.19 N/A 0.0389 0.1295 116.58
7:45 1.2 0.25 0.19 N/A 0.0626 0.2084 187.52
8:00
1.3 0.27 0.19 N/A 0.0863 0.2871 258.39
8:15 1.5 0.32 0.18 N/A 0.1310 0.4358 392.20
8:30 1.5 0.32 0.18 N/A 0.1335 0.4444 399.93
8:45 1.6 0.34 0.18 N/A 0.1571 0.5229 470.60
9:00
1.7 0.36 0.18 N/A 0.1807 0.6013 541.20
9:15 1.9 0.40 0.17 N/A 0.2253 0.7497 674.74
9:30 2 0.42 0.17 N/A 0.2488 0.8280 745.20
9:45 2.1 0.44 0.17 N/A 0.2723 0.9062 815.59
10:00
2.2 0.46 0.17 N/A 0.2958 0.9843 885.91
10:15 1.5 0.32 0.16 N/A 0.1510 0.5023 452.09
10:30 1.5 0.32 0.16 N/A 0.1534 0.5103 459.25
10:45 2 0.42 0.16 N/A 0.2609 0.8682 781.40
11:00
2 0.42 0.16 N/A 0.2633 0.8760 788.42
11:15 1.9 0.40 0.16 N/A 0.2445 0.8137 732.36
11:30 1.9 0.40 0.15 N/A 0.2468 0.8214 739.23
11:45 1.7 0.36 0.15 N/A 0.2070 0.6889 620.01
12:00
1.8 0.38 0.15 N/A 0.2303 0.7664 689.74
12:15 2.5 0.53 0.15 N/A 0.3798 1.2638 1137.45
12:30 2.6 0.55 0.14 N/A 0.4030 1.3411 1207.03
12:45 2.8 0.59 0.14 N/A 0.4473 1.4884 1339.54
6 of 6
13:00
2.9 0.61 0.14 N/A 0.4705 1.5655 1408.96
13:15 3.4 0.72 0.14 N/A 0.5778 1.9226 1730.34
13:30 3.4 0.72 0.14 N/A
0.5799
1.9295
1736.59
13:45 2.3 0.48 0.13 N/A 0.3505 1.1663 1049.65
14:00
2.3 0.48 0.13 N/A 0.3525 1.1730 1055.74
14:15 2.7 0.57 0.13 N/A 0.4387 1.4598 1313.78
14:30 2.6 0.55 0.13 N/A 0.4196 1.3963 1256.69
14:45 2.6 0.55 0.13 N/A 0.4216 1.4028 1262.53
15:00
2.5 0.53 0.12 N/A 0.4025 1.3392 1205.27
15:15 2.4 0.50 0.12 N/A 0.3833 1.2755 1147.92
15:30 2.3 0.48 0.12 N/A 0.3641 1.2116 1090.48
15:45 1.9 0.40 0.12 N/A 0.2818 0.9377 843.93
16:00
1.9 0.40 0.12 N/A 0.2836 0.9437 849.32
16:15 0.4 0.08 0.11 0.08 0.0084 0.0280 25.20
16:30 0.4 0.08 0.11 0.08 0.0084 0.0280 25.20
16:45 0.3 0.06 0.11 0.06 0.0063 0.0210 18.90
17:00
0.3 0.06 0.11 0.06 0.0063 0.0210 18.90
17:15 0.5 0.11 0.11 0.09 0.0105 0.0350 31.50
17:30 0.5 0.11 0.11 0.09 0.0105 0.0350 31.50
17:45 0.5 0.11 0.10 0.09 0.0105 0.0350 31.50
18:00
0.4 0.08 0.10 0.08 0.0084 0.0280 25.20
18:15 0.4 0.08 0.10 0.08 0.0084 0.0280 25.20
18:30 0.4 0.08 0.10 0.08 0.0084 0.0280 25.20
18:45 0.3 0.06 0.10 0.06 0.0063 0.0210 18.90
19:00
0.2 0.04 0.10 0.04 0.0042 0.0140 12.60
19:15 0.3 0.06 0.10 0.06 0.0063 0.0210 18.90
19:30 0.4 0.08 0.09 0.08 0.0084 0.0280 25.20
19:45 0.3 0.06 0.09 0.06 0.0063 0.0210 18.90
20:00
0.2 0.04 0.09 0.04 0.0042 0.0140 12.60
20:15 0.3 0.06 0.09 0.06 0.0063 0.0210 18.90
20:30 0.3 0.06 0.09 0.06 0.0063 0.0210 18.90
20:45 0.3 0.06 0.09 0.06 0.0063 0.0210 18.90
21:00
0.2 0.04 0.09 0.04 0.0042 0.0140 12.60
21:15 0.3 0.06 0.09 0.06 0.0063 0.0210 18.90
21:30 0.2 0.04 0.09 0.04 0.0042 0.0140 12.60
21:45 0.3 0.06 0.08 0.06 0.0063 0.0210 18.90
22:00
0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
22:15 0.3 0.06 0.08 0.06 0.0063 0.0210 18.90
22:30 0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
22:45 0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
23:00
0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
23:15 0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
23:30 0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
23:45 0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
24:00
0.2 0.04 0.08 0.04 0.0042 0.0140 12.60
0 0.00 0.08 0.00 0.0000 0.0000 0.00
Total volume (cf) 32055.31
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T5
Drainage Area (ac.) 0.5200
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
90 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.14 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 0.0001
s.f.
Bot. = 0.0001 s.f. Max. Depth (d)= 0.0001 Max. storage= 0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 3.7 0.8569 0.1406 N/A 0.7163 0.3756 112.68
0:10 4.8 1.1117 0.1406 N/A 0.9711 0.5092 152.75
0:15 5.1 1.1812 0.1406 N/A 1.0406 0.5456 163.68
0:20 4.9 1.1348 0.1406 N/A 0.9942 0.5213 156.39
0:25 6.6 1.5286 0.1406 N/A 1.3880 0.7278 218.33
0:30 7.3 1.6907 0.1406 N/A 1.5501 0.8128 243.83
0:35 8.4 1.9454 0.1406 N/A 1.8048 0.9463 283.90
0:40 9 2.0844 0.1406 N/A 1.9438 1.0192 305.76
0:45 12.3 2.8487 0.1406 N/A 2.7081 1.4199 425.98
0:50 17.6 4.0762 0.1406 N/A
3.9356 2.0635 619.06
0:55 16.1 3.7288 0.1406 N/A 3.5882 1.8814 564.42
1:00
4.2 0.9727 0.1406 N/A 0.8321 0.4363 130.89
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
1:15 0 0.0000 0.1406 0.00 0.0000 0.0000 0.00
Total volume (cf) 3377.67
2 of 6
3 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 1.3 0.42 0.14 N/A 0.2806 0.1471 44.14
0:10 1.3 0.42 0.14 N/A 0.2806 0.1471 44.14
0:15 1.1 0.36 0.14 N/A 0.2158 0.1132 33.95
0:20 1.5 0.49 0.14 N/A 0.3454 0.1811 54.33
0:25 1.5 0.49 0.14 N/A 0.3454 0.1811 54.33
0:30 1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
0:35 1.5 0.49 0.14 N/A 0.3454 0.1811 54.33
0:40 1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
0:45 1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
0:50 1.5 0.49 0.14 N/A 0.3454 0.1811 54.33
0:55 1.6 0.52 0.14 N/A 0.3778 0.1981 59.43
1:00
1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
1:05 2.2 0.71 0.14 N/A 0.5722 0.3000 90.01
1:10 2.2 0.71 0.14 N/A 0.5722 0.3000 90.01
1:15 2.2 0.71 0.14 N/A 0.5722 0.3000 90.01
1:20 2 0.65 0.14 N/A 0.5074 0.2660 79.81
1:25 2.6 0.84 0.14 N/A 0.7018 0.3680 110.39
1:30 2.7 0.87 0.14 N/A 0.7342 0.3850 115.49
1:35 2.4 0.78 0.14 N/A 0.6370 0.3340 100.20
1:40 2.7 0.87 0.14 N/A 0.7342 0.3850 115.49
1:45 3.3 1.07 0.14 N/A 0.9286 0.4869 146.07
1:50 3.1 1.00 0.14 N/A 0.8638 0.4529 135.88
1:55 2.9 0.94 0.14 N/A 0.7990 0.4189 125.68
2:00
3 0.97 0.14 N/A 0.8314 0.4359 130.78
2:05 3.1 1.00 0.14 N/A 0.8638 0.4529 135.88
2:10 4.2 1.36 0.14 N/A 1.2202 0.6398 191.94
2:15 5 1.62 0.14 N/A 1.4794 0.7757 232.71
2:20 3.5 1.13 0.14 N/A 0.9934 0.5209 156.26
2:25 6.8 2.20 0.14 N/A 2.0626 1.0815 324.45
2:30 7.3 2.37 0.14 N/A 2.2246 1.1664 349.93
2:35 8.2 2.66 0.14 N/A
2.5162 1.3193 395.80
2:40 5.9 1.91 0.14 N/A 1.7710 0.9286 278.58
2:45 2 0.65 0.14 N/A 0.5074 0.2660 79.81
2:50 1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
2:55 1.8 0.58 0.14 N/A 0.4426 0.2321 69.62
3:00
0.6 0.19 0.14 N/A 0.0538 0.0282 8.46
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
3:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 4300.33
3 of 6
6 Hour Storm in 5 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:05 0.5 0.21 0.14 N/A 0.0688 0.0361 10.82
0:10 0.6 0.25 0.14 N/A 0.1107 0.0580 17.41
0:15 0.6 0.25 0.14 N/A 0.1107 0.0580 17.41
0:20 0.6 0.25 0.14 N/A 0.1107 0.0580 17.41
0:25 0.6 0.25 0.14 N/A 0.1107 0.0580 17.41
0:30 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
0:35 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
0:40 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
0:45 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
0:50 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
0:55 0.7 0.29 0.14 N/A 0.1526 0.0800 24.00
1:00
0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:05 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:10 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:15 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:20 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:25 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:30 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:35 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:40 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:45 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:50 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
1:55 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
2:00
0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:05 0.8 0.34 0.14 N/A 0.1944 0.1020 30.59
2:10 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:15 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:20 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:25 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:30 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:35 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:40 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
2:45 1 0.42 0.14 N/A 0.2782 0.1459 43.76
2:50 1 0.42 0.14 N/A 0.2782 0.1459 43.76
2:55 1 0.42 0.14 N/A 0.2782 0.1459 43.76
3:00
1 0.42 0.14 N/A 0.2782 0.1459 43.76
3:05 1 0.42 0.14 N/A 0.2782 0.1459 43.76
3:10 1.1 0.46 0.14 N/A 0.3201 0.1678 50.35
3:15 1.1 0.46 0.14 N/A 0.3201 0.1678 50.35
3:20 1.1 0.46 0.14 N/A 0.3201 0.1678 50.35
3:25 1.2 0.50 0.14 N/A 0.3620 0.1898 56.94
3:30 1.3 0.54 0.14 N/A 0.4038 0.2117 63.52
3:35 1.4 0.59 0.14 N/A 0.4457 0.2337 70.11
3:40 1.4 0.59 0.14 N/A 0.4457 0.2337 70.11
3:45 1.5 0.63 0.14 N/A 0.4876 0.2557 76.70
3:50 1.5 0.63 0.14 N/A 0.4876 0.2557 76.70
3:55 1.6 0.67 0.14 N/A 0.5295 0.2776 83.29
4:00
1.6 0.67 0.14 N/A 0.5295 0.2776 83.29
4:05 1.7 0.71 0.14 N/A 0.5714 0.2996 89.87
4:10 1.8 0.75 0.14 N/A 0.6132 0.3215 96.46
4:15 1.9 0.80 0.14 N/A 0.6551 0.3435 103.05
4 of 6
4:20 2 0.84 0.14 N/A 0.6970 0.3655 109.64
4:25 2.1 0.88 0.14 N/A 0.7389 0.3874 116.23
4:30 2.1 0.88 0.14 N/A 0.7389 0.3874 116.23
4:35 2.2 0.92 0.14 N/A 0.7808 0.4094 122.81
4:40 2.3 0.96 0.14 N/A 0.8226 0.4313 129.40
4:45 2.4 1.01 0.14 N/A 0.8645 0.4533 135.99
4:50 2.4 1.01 0.14 N/A 0.8645 0.4533 135.99
4:55 2.5 1.05 0.14 N/A 0.9064 0.4753 142.58
5:00
2.6 1.09 0.14 N/A 0.9483 0.4972 149.16
5:05 3.1 1.30 0.14 N/A 1.1577 0.6070 182.10
5:10 3.6 1.51 0.14 N/A 1.3671 0.7168 215.04
5:15 3.9 1.63 0.14 N/A 1.4927 0.7827 234.80
5:20 4.2 1.76 0.14 N/A 1.6184 0.8486 254.57
5:25 4.7 1.97 0.14 N/A 1.8278 0.9584 287.51
5:30 5.6 2.35 0.14 N/A
2.2047 1.1560 346.80
5:35 1.9 0.80 0.14 N/A 0.6551 0.3435 103.05
5:40 0.9 0.38 0.14 N/A 0.2363 0.1239 37.17
5:45 0.6 0.25 0.14 N/A 0.1107 0.0580 17.41
5:50 0.5 0.21 0.14 N/A 0.0688 0.0361 10.82
5:55 0.3 0.13 0.14 0.11 0.0126 0.0066 1.98
6:00
0.2 0.08 0.14 0.08 0.0084 0.0044 1.32
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:15 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:30 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
6:45 0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
7:00
0 0.00 0.14 0.00 0.0000 0.0000 0.00
Total volume (cf) 5009.93
5 of 6
24 Hour Storm in 15 minute increments
Time Pattern Storm Loss Rate Value Effective Flow Flow % Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf)
0:15 0.2 0.04 0.25 0.04 0.0042 0.0022 1.99
0:30 0.3 0.06 0.24 0.06 0.0063 0.0033 2.98
0:45 0.3 0.06 0.24 0.06 0.0063 0.0033 2.98
1:00
0.4 0.08 0.24 0.08 0.0084 0.0044 3.97
1:15 0.3 0.06 0.24 0.06 0.0063 0.0033 2.98
1:30 0.3 0.06 0.23 0.06 0.0063 0.0033 2.98
1:45 0.3 0.06 0.23 0.06 0.0063 0.0033 2.98
2:00
0.4 0.08 0.23 0.08 0.0084 0.0044 3.97
2:15 0.4 0.08 0.22 0.08 0.0084 0.0044 3.97
2:30 0.4 0.08 0.22 0.08 0.0084 0.0044 3.97
2:45 0.5 0.11 0.22 0.09 0.0105 0.0055 4.96
3:00
0.5 0.11 0.22 0.09 0.0105 0.0055 4.96
3:15 0.5 0.11 0.21 0.09 0.0105 0.0055 4.96
3:30 0.5 0.11 0.21 0.09 0.0105 0.0055 4.96
3:45 0.5 0.11 0.21 0.09 0.0105 0.0055 4.96
4:00
0.6 0.13 0.21 0.11 0.0126 0.0066 5.96
4:15 0.6 0.13 0.20 0.11 0.0126 0.0066 5.96
4:30 0.7 0.15 0.20 0.13 0.0147 0.0077 6.95
4:45 0.7 0.15 0.20 0.13 0.0147 0.0077 6.95
5:00
0.8 0.17 0.20 0.15 0.0168 0.0088 7.94
5:15 0.6 0.13 0.19 0.11 0.0126 0.0066 5.96
5:30 0.7 0.15 0.19 0.13 0.0147 0.0077 6.95
5:45 0.8 0.17 0.19 0.15 0.0168 0.0088 7.94
6:00
0.8 0.17 0.19 0.15 0.0168 0.0088 7.94
6:15 0.9 0.19 0.18 0.17 0.0189 0.0099 8.94
6:30 0.9 0.19 0.18 0.17 0.0189 0.0099 8.94
6:45 1 0.21 0.18 N/A 0.0326 0.0171 15.36
7:00
1 0.21 0.18 N/A 0.0350 0.0183 16.50
7:15 1 0.21 0.17 N/A 0.0373 0.0196 17.63
7:30 1.1 0.23 0.17 N/A 0.0608 0.0319 28.67
7:45 1.2 0.25 0.17 N/A 0.0841 0.0441 39.71
8:00
1.3 0.27 0.17 N/A 0.1075 0.0564 50.73
8:15 1.5 0.32 0.16 N/A 0.1519 0.0796 71.68
8:30 1.5 0.32 0.16 N/A 0.1542 0.0808 72.76
8:45 1.6 0.34 0.16 N/A 0.1775 0.0931 83.76
9:00
1.7 0.36 0.16 N/A 0.2008 0.1053 94.75
9:15 1.9 0.40 0.15 N/A 0.2451 0.1285 115.66
9:30 2 0.42 0.15 N/A 0.2683 0.1407 126.63
9:45 2.1 0.44 0.15 N/A 0.2916 0.1529 137.59
10:00
2.2 0.46 0.15 N/A 0.3148 0.1650 148.54
10:15 1.5 0.32 0.15 N/A 0.1696 0.0889 80.05
10:30 1.5 0.32 0.14 N/A 0.1718 0.0901 81.05
10:45 2 0.42 0.14 N/A 0.2791 0.1463 131.68
11:00
2 0.42 0.14 N/A 0.2811 0.1474 132.67
11:15 1.9 0.40 0.14 N/A 0.2621 0.1375 123.71
11:30 1.9 0.40 0.14 N/A 0.2642 0.1385 124.67
11:45 1.7 0.36 0.13 N/A 0.2241 0.1175 105.76
12:00
1.8 0.38 0.13 N/A 0.2471 0.1296 116.63
12:15 2.5 0.53 0.13 N/A 0.3964 0.2078 187.06
12:30 2.6 0.55 0.13 N/A 0.4194 0.2199 197.90
12:45 2.8 0.59 0.13 N/A 0.4634 0.2430 218.67
6 of 6
13:00
2.9 0.61 0.12 N/A 0.4863 0.2550 229.49
13:15 3.4 0.72 0.12 N/A 0.5934 0.3111 280.02
13:30 3.4 0.72 0.12 N/A
0.5952
0.3121
280.89
13:45 2.3 0.48 0.12 N/A 0.3656 0.1917 172.54
14:00
2.3 0.48 0.12 N/A 0.3674 0.1927 173.39
14:15 2.7 0.57 0.11 N/A 0.4534 0.2377 213.94
14:30 2.6 0.55 0.11 N/A 0.4341 0.2276 204.84
14:45 2.6 0.55 0.11 N/A 0.4358 0.2285 205.66
15:00
2.5 0.53 0.11 N/A 0.4165 0.2184 196.53
15:15 2.4 0.50 0.11 N/A 0.3971 0.2082 187.39
15:30 2.3 0.48 0.11 N/A 0.3777 0.1980 178.24
15:45 1.9 0.40 0.10 N/A 0.2952 0.1548 139.29
16:00
1.9 0.40 0.10 N/A 0.2968 0.1556 140.05
16:15 0.4 0.08 0.10 0.08 0.0084 0.0044 3.97
16:30 0.4 0.08 0.10 0.08 0.0084 0.0044 3.97
16:45 0.3 0.06 0.10 0.06 0.0063 0.0033 2.98
17:00
0.3 0.06 0.10 0.06 0.0063 0.0033 2.98
17:15 0.5 0.11 0.10 0.09 0.0105 0.0055 4.96
17:30 0.5 0.11 0.09 N/A 0.0112 0.0059 5.29
17:45 0.5 0.11 0.09 N/A 0.0126 0.0066 5.95
18:00
0.4 0.08 0.09 0.08 0.0084 0.0044 3.97
18:15 0.4 0.08 0.09 0.08 0.0084 0.0044 3.97
18:30 0.4 0.08 0.09 0.08 0.0084 0.0044 3.97
18:45 0.3 0.06 0.09 0.06 0.0063 0.0033 2.98
19:00
0.2 0.04 0.09 0.04 0.0042 0.0022 1.99
19:15 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
19:30 0.4 0.08 0.08 0.08 0.0084 0.0044 3.97
19:45 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
20:00
0.2 0.04 0.08 0.04 0.0042 0.0022 1.99
20:15 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
20:30 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
20:45 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
21:00
0.2 0.04 0.08 0.04 0.0042 0.0022 1.99
21:15 0.3 0.06 0.08 0.06 0.0063 0.0033 2.98
21:30 0.2 0.04 0.08 0.04 0.0042 0.0022 1.99
21:45 0.3 0.06 0.07 0.06 0.0063 0.0033 2.98
22:00
0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
22:15 0.3 0.06 0.07 0.06 0.0063 0.0033 2.98
22:30 0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
22:45 0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
23:00
0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
23:15 0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
23:30 0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
23:45 0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
24:00
0.2 0.04 0.07 0.04 0.0042 0.0022 1.99
0 0.00 0.07 0.00 0.0000 0.0000 0.00
Total volume (cf) 5356.72
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T6
Drainage Area (ac.) 1.5400
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
5 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.71 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 25510
s.f.
Bot. = 3800 s.f. Max. Depth (d)= 5 Max. storage= 65259.52 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 3.7 0.8569 0.7067 N/A 0.1502 0.2333 69.98 0.00 0.00 0.00 0.00 0.00 69.98 3800.00 52.78 17.20 0.00 0.00 0.00 0:10 4.8 1.1117 0.7067 N/A 0.4050 0.6289 188.66 0.00 0.00 0.00 0.00 0.00 188.66 3805.72 52.86 153.00 0.01 0.00 0.00 0:15 5.1 1.1812 0.7067 N/A 0.4745 0.7368 221.03 0.00 0.00 0.00 0.00 0.00 221.03 3850.90 53.48 320.55 0.02 0.00 0.00 0:20 4.9 1.1348 0.7067 N/A 0.4281 0.6648 199.45 0.00 0.00 0.00 0.00 0.00 199.45 3906.64 54.26 465.74 0.04 0.00 0.00 0:25 6.6 1.5286 0.7067 N/A 0.8219 1.2762 382.86 0.00 0.00 0.00 0.00 0.00 382.86 3954.94 54.93 793.67 0.06 0.00 0.00 0:30 7.3 1.6907 0.7067 N/A 0.9840 1.5280 458.39 0.00 0.00 0.00 0.00 0.00 458.39 4064.03 56.44 1195.61 0.09 0.00 0.00 0:35 8.4 1.9454 0.7067 N/A 1.2387 1.9236 577.07 0.00 0.00 0.00 0.00 0.00 577.07 4197.75 58.30 1714.38 0.13 0.00 0.00 0:40 9 2.0844 0.7067 N/A 1.3777 2.1393 641.80 0.00 0.00 0.00 0.00 0.00 641.80 4370.33 60.70 2295.48 0.18 0.00 0.00 0:45 12.3 2.8487 0.7067 N/A 2.1420 3.3261 997.84 0.00 0.00 0.00 0.00 0.00 997.84 4563.64 63.38 3229.94 0.25 0.00 0.00 0:50 17.6 4.0762 0.7067 N/A
3.3695 5.2322 1569.66
0.00 0.00 0.00 0.00 0.00 1569.66 4874.51 67.70 4731.90 0.36 0.00 0.00 0:55 16.1 3.7288 0.7067 N/A 3.0221 4.6928 1407.83 0.00 0.00 0.00 0.00 0.00 1407.83 5374.17 74.64 6065.09 0.46 0.00 0.00 1:00
4.2 0.9727 0.7067 N/A 0.2660 0.4131 123.93 0.00 0.00 0.00 0.00 0.00 123.93 5817.68 80.80 6108.21 0.47
0.00 0.00
0 0.0000 0.7067 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5832.03 81.00 6027.21 0.46 0.00 0.00 0 0.0000 0.7067 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5805.08 80.63 5946.58 0.46 0.00 0.00 1:15 0 0.0000 0.7067 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5778.26 80.25 5866.33 0.45 0.00 0.00 Total volume (cf) 6838.49
Total Overflow (cf) 0.00
2 of 6
3 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 1.3 0.42 0.71 0.38 0.0421 0.0654 19.62 0.00 0.00 0.00 0.00 0.00 19.62 3800.00 19.62 0.00 0.00 0.00 0.00 0:10 1.3 0.42 0.71 0.38 0.0421 0.0654 19.62 0.00 0.00 0.00 0.00 0.00 19.62 3800.00 19.62 0.00 0.00 0.00 0.00 0:15 1.1 0.36 0.71 0.32 0.0356 0.0553 16.60 0.00 0.00 0.00 0.00 0.00 16.60 3800.00 16.60 0.00 0.00 0.00 0.00 0:20 1.5 0.49 0.71 0.44 0.0486 0.0755 22.64 0.00 0.00 0.00 0.00 0.00 22.64 3800.00 22.64 0.00 0.00 0.00 0.00 0:25 1.5 0.49 0.71 0.44 0.0486 0.0755 22.64 0.00 0.00 0.00 0.00 0.00 22.64 3800.00 22.64 0.00 0.00 0.00 0.00 0:30 1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 3800.00 27.17 0.00 0.00 0.00 0.00 0:35 1.5 0.49 0.71 0.44 0.0486 0.0755 22.64 0.00 0.00 0.00 0.00 0.00 22.64 3800.00 22.64 0.00 0.00 0.00 0.00 0:40 1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 3800.00 27.17 0.00 0.00 0.00 0.00 0:45 1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 3800.00 27.17 0.00 0.00 0.00 0.00 0:50 1.5 0.49 0.71 0.44 0.0486 0.0755 22.64 0.00 0.00 0.00 0.00 0.00 22.64 3800.00 22.64 0.00 0.00 0.00 0.00 0:55 1.6 0.52 0.71 0.47 0.0518 0.0805 24.15 0.00 0.00 0.00 0.00 0.00 24.15 3800.00 24.15 0.00 0.00 0.00 0.00 1:00
1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 3800.00 27.17 0.00 0.00 0.00 0.00 1:05 2.2 0.71 0.71 0.64 0.0713 0.1107 33.21 0.00 0.00 0.00 0.00 0.00 33.21 3800.00 33.21 0.00 0.00 0.00 0.00 1:10 2.2 0.71 0.71 0.64 0.0713 0.1107 33.21 0.00 0.00 0.00 0.00 0.00 33.21 3800.00 33.21 0.00 0.00 0.00 0.00 1:15 2.2 0.71 0.71 0.64 0.0713 0.1107 33.21 0.00 0.00 0.00 0.00 0.00 33.21 3800.00 33.21 0.00 0.00 0.00 0.00 1:20 2 0.65 0.71 0.58 0.0648 0.1006 30.19 0.00 0.00 0.00 0.00 0.00 30.19 3800.00 30.19 0.00 0.00 0.00 0.00 1:25 2.6 0.84 0.71 N/A 0.1357 0.2107 63.22 0.00 0.00 0.00 0.00 0.00 63.22 3800.00 52.78 10.44 0.00 0.00 0.00 1:30 2.7 0.87 0.71 N/A 0.1681 0.2610 78.31 0.00 0.00 0.00 0.00 0.00 78.31 3803.47 52.83 35.92 0.00 0.00 0.00 1:35 2.4 0.78 0.71 0.70 0.0778 0.1207 36.22 0.00 0.00 0.00 0.00 0.00 36.22 3811.95 52.94 19.20 0.00 0.00 0.00 1:40 2.7 0.87 0.71 N/A 0.1681 0.2610 78.31 0.00 0.00 0.00 0.00 0.00 78.31 3806.39 52.87 44.65 0.00 0.00 0.00 1:45 3.3 1.07 0.71 N/A 0.3625 0.5629 168.87 0.00 0.00 0.00 0.00 0.00 168.87 3814.85 52.98 160.53 0.01 0.00 0.00 1:50 3.1 1.00 0.71 N/A 0.2977 0.4623 138.68 0.00 0.00 0.00 0.00 0.00 138.68 3853.40 53.52 245.70 0.02 0.00 0.00 1:55 2.9 0.94 0.71 N/A 0.2329 0.3617 108.50 0.00 0.00 0.00 0.00 0.00 108.50 3881.74 53.91 300.28 0.02 0.00 0.00 2:00
3 0.97 0.71 N/A 0.2653 0.4120 123.59 0.00 0.00 0.00 0.00 0.00 123.59 3899.89 54.17 369.70 0.03 0.00 0.00 2:05 3.1 1.00 0.71 N/A 0.2977 0.4623 138.68 0.00 0.00 0.00 0.00 0.00 138.68 3922.99 54.49 453.90 0.03 0.00 0.00 2:10 4.2 1.36 0.71 N/A 0.6541 1.0157 304.71 0.00 0.00 0.00 0.00 0.00 304.71 3951.00 54.88 703.74 0.05 0.00 0.00 2:15 5 1.62 0.71 N/A 0.9133 1.4182 425.46 0.00 0.00 0.00 0.00 0.00 425.46 4034.11 56.03 1073.17 0.08 0.00 0.00 2:20 3.5 1.13 0.71 N/A 0.4273 0.6635 199.06 0.00 0.00 0.00 0.00 0.00 199.06 4157.01 57.74 1214.49 0.09 0.00 0.00 2:25 6.8 2.20 0.71 N/A 1.4965 2.3238 697.14 0.00 0.00 0.00 0.00 0.00 697.14 4204.03 58.39 1853.25 0.14 0.00 0.00 2:30 7.3 2.37 0.71 N/A 1.6585 2.5754 772.61 0.00 0.00 0.00 0.00 0.00 772.61 4416.52 61.34 2564.52 0.20 0.00 0.00 2:35 8.2 2.66 0.71 N/A
1.9501 3.0282 908.45
0.00 0.00 0.00 0.00 0.00 908.45 4653.14 64.63 3408.35 0.26 0.00 0.00 2:40 5.9 1.91 0.71 N/A 1.2049 1.8710 561.30 0.00 0.00 0.00 0.00 0.00 561.30 4933.86 68.53 3901.12 0.30
0.00 0.00
2:45 2 0.65 0.71 0.58 0.0648 0.1006 30.19 0.00 0.00 0.00 0.00 0.00 30.19 5097.79 70.80 3860.51 0.30 0.00 0.00 2:50 1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 5084.28 70.62 3817.06 0.29 0.00 0.00 2:55 1.8 0.58 0.71 0.52 0.0583 0.0906 27.17 0.00 0.00 0.00 0.00 0.00 27.17 5069.83 70.41 3773.81 0.29 0.00 0.00 3:00
0.6 0.19 0.71 0.17 0.0194 0.0302 9.06 0.00 0.00 0.00 0.00 0.00 9.06 5055.44 70.21 3712.66 0.28 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5035.10 69.93 3642.72 0.28 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5011.83 69.61 3573.12 0.27 0.00 0.00 3:15 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4988.67 69.29 3503.83 0.27 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4965.62 68.97 3434.86 0.26 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4942.68 68.65 3366.21 0.26 0.00 0.00 3:30 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4919.84 68.33 3297.88 0.25 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4897.11 68.02 3229.87 0.25 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4874.49 67.70 3162.17 0.24 0.00 0.00 Total volume (cf) 5305.74
Total Overflow (cf) 0.00
3 of 6
6 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 0.5 0.21 0.71 0.19 0.0209 0.0325 9.75 0.00 0.00 0.00 0.00 0.00 9.75 3800.00 9.75 0.00 0.00 0.00 0.00 0:10 0.6 0.25 0.71 0.23 0.0251 0.0390 11.71 0.00 0.00 0.00 0.00 0.00 11.71 3800.00 11.71 0.00 0.00 0.00 0.00 0:15 0.6 0.25 0.71 0.23 0.0251 0.0390 11.71 0.00 0.00 0.00 0.00 0.00 11.71 3800.00 11.71 0.00 0.00 0.00 0.00 0:20 0.6 0.25 0.71 0.23 0.0251 0.0390 11.71 0.00 0.00 0.00 0.00 0.00 11.71 3800.00 11.71 0.00 0.00 0.00 0.00 0:25 0.6 0.25 0.71 0.23 0.0251 0.0390 11.71 0.00 0.00 0.00 0.00 0.00 11.71 3800.00 11.71 0.00 0.00 0.00 0.00 0:30 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 0:35 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 0:40 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 0:45 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 0:50 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 0:55 0.7 0.29 0.71 0.26 0.0293 0.0455 13.66 0.00 0.00 0.00 0.00 0.00 13.66 3800.00 13.66 0.00 0.00 0.00 0.00 1:00
0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:05 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:10 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:15 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:20 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:25 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:30 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:35 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:40 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:45 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:50 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 1:55 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 2:00
0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:05 0.8 0.34 0.71 0.30 0.0335 0.0520 15.61 0.00 0.00 0.00 0.00 0.00 15.61 3800.00 15.61 0.00 0.00 0.00 0.00 2:10 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:15 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:20 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:25 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:30 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:35 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:40 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 3800.00 17.56 0.00 0.00 0.00 0.00 2:45 1 0.42 0.71 0.38 0.0419 0.0650 19.51 0.00 0.00 0.00 0.00 0.00 19.51 3800.00 19.51 0.00 0.00 0.00 0.00 2:50 1 0.42 0.71 0.38 0.0419 0.0650 19.51 0.00 0.00 0.00 0.00 0.00 19.51 3800.00 19.51 0.00 0.00 0.00 0.00 2:55 1 0.42 0.71 0.38 0.0419 0.0650 19.51 0.00 0.00 0.00 0.00 0.00 19.51 3800.00 19.51 0.00 0.00 0.00 0.00 3:00
1 0.42 0.71 0.38 0.0419 0.0650 19.51 0.00 0.00 0.00 0.00 0.00 19.51 3800.00 19.51 0.00 0.00 0.00 0.00 3:05 1 0.42 0.71 0.38 0.0419 0.0650 19.51 0.00 0.00 0.00 0.00 0.00 19.51 3800.00 19.51 0.00 0.00 0.00 0.00 3:10 1.1 0.46 0.71 0.41 0.0461 0.0715 21.46 0.00 0.00 0.00 0.00 0.00 21.46 3800.00 21.46 0.00 0.00 0.00 0.00 3:15 1.1 0.46 0.71 0.41 0.0461 0.0715 21.46 0.00 0.00 0.00 0.00 0.00 21.46 3800.00 21.46 0.00 0.00 0.00 0.00 3:20 1.1 0.46 0.71 0.41 0.0461 0.0715 21.46 0.00 0.00 0.00 0.00 0.00 21.46 3800.00 21.46 0.00 0.00 0.00 0.00 3:25 1.2 0.50 0.71 0.45 0.0503 0.0780 23.41 0.00 0.00 0.00 0.00 0.00 23.41 3800.00 23.41 0.00 0.00 0.00 0.00 3:30 1.3 0.54 0.71 0.49 0.0544 0.0845 25.36 0.00 0.00 0.00 0.00 0.00 25.36 3800.00 25.36 0.00 0.00 0.00 0.00 3:35 1.4 0.59 0.71 0.53 0.0586 0.0910 27.31 0.00 0.00 0.00 0.00 0.00 27.31 3800.00 27.31 0.00 0.00 0.00 0.00 3:40 1.4 0.59 0.71 0.53 0.0586 0.0910 27.31 0.00 0.00 0.00 0.00 0.00 27.31 3800.00 27.31 0.00 0.00 0.00 0.00 3:45 1.5 0.63 0.71 0.57 0.0628 0.0975 29.26 0.00 0.00 0.00 0.00 0.00 29.26 3800.00 29.26 0.00 0.00 0.00 0.00 3:50 1.5 0.63 0.71 0.57 0.0628 0.0975 29.26 0.00 0.00 0.00 0.00 0.00 29.26 3800.00 29.26 0.00 0.00 0.00 0.00 3:55 1.6 0.67 0.71 0.60 0.0670 0.1041 31.22 0.00 0.00 0.00 0.00 0.00 31.22 3800.00 31.22 0.00 0.00 0.00 0.00 4:00
1.6 0.67 0.71 0.60 0.0670 0.1041 31.22 0.00 0.00 0.00 0.00 0.00 31.22 3800.00 31.22 0.00 0.00 0.00 0.00 4:05 1.7 0.71 0.71 0.64 0.0712 0.1106 33.17 0.00 0.00 0.00 0.00 0.00 33.17 3800.00 33.17 0.00 0.00 0.00 0.00 4:10 1.8 0.75 0.71 0.68 0.0754 0.1171 35.12 0.00 0.00 0.00 0.00 0.00 35.12 3800.00 35.12 0.00 0.00 0.00 0.00 4:15 1.9 0.80 0.71 N/A 0.0890 0.1382 41.47 0.00 0.00 0.00 0.00 0.00 41.47 3800.00 41.47 0.00 0.00 0.00 0.00 4 of 6
4:20 2 0.84 0.71 N/A 0.1309 0.2033 60.98 0.00 0.00 0.00 0.00 0.00 60.98 3800.00 52.78 8.20 0.00 0.00 0.00 4:25 2.1 0.88 0.71 N/A 0.1728 0.2683 80.49 0.00 0.00 0.00 0.00 0.00 80.49 3802.73 52.82 35.88 0.00 0.00 0.00 4:30 2.1 0.88 0.71 N/A 0.1728 0.2683 80.49 0.00 0.00 0.00 0.00 0.00 80.49 3811.93 52.94 63.42 0.00 0.00 0.00 4:35 2.2 0.92 0.71 N/A 0.2147 0.3333 100.00 0.00 0.00 0.00 0.00 0.00 100.00 3821.10 53.07 110.35 0.01 0.00 0.00 4:40 2.3 0.96 0.71 N/A 0.2565 0.3984 119.51 0.00 0.00 0.00 0.00 0.00 119.51 3836.71 53.29 176.57 0.01 0.00 0.00 4:45 2.4 1.01 0.71 N/A 0.2984 0.4634 139.02 0.00 0.00 0.00 0.00 0.00 139.02 3858.74 53.59 262.00 0.02 0.00 0.00 4:50 2.4 1.01 0.71 N/A 0.2984 0.4634 139.02 0.00 0.00 0.00 0.00 0.00 139.02 3887.16 53.99 347.03 0.03 0.00 0.00 4:55 2.5 1.05 0.71 N/A 0.3403 0.5284 158.53 0.00 0.00 0.00 0.00 0.00 158.53 3915.45 54.38 451.18 0.03 0.00 0.00 5:00
2.6 1.09 0.71 N/A 0.3822 0.5935 178.04 0.00 0.00 0.00 0.00 0.00 178.04 3950.09 54.86 574.35 0.04 0.00 0.00 5:05 3.1 1.30 0.71 N/A 0.5916 0.9186 275.59 0.00 0.00 0.00 0.00 0.00 275.59 3991.07 55.43 794.51 0.06 0.00 0.00 5:10 3.6 1.51 0.71 N/A 0.8010 1.2438 373.14 0.00 0.00 0.00 0.00 0.00 373.14 4064.31 56.45 1111.20 0.09 0.00 0.00 5:15 3.9 1.63 0.71 N/A 0.9266 1.4389 431.67 0.00 0.00 0.00 0.00 0.00 431.67 4169.66 57.91 1484.95 0.11 0.00 0.00 5:20 4.2 1.76 0.71 N/A 1.0523 1.6340 490.20 0.00 0.00 0.00 0.00 0.00 490.20 4294.00 59.64 1915.51 0.15 0.00 0.00 5:25 4.7 1.97 0.71 N/A 1.2617 1.9591 587.74 0.00 0.00 0.00 0.00 0.00 587.74 4437.23 61.63 2441.62 0.19 0.00 0.00 5:30 5.6 2.35 0.71 N/A
1.6386 2.5444 763.33
0.00 0.00 0.00 0.00 0.00 763.33 4612.26 64.06 3140.90 0.24 0.00 0.00 5:35 1.9 0.80 0.71 N/A 0.0890 0.1382 41.47 0.00 0.00 0.00 0.00 0.00 41.47 4844.89 67.29 3115.08 0.24
0.00 0.00
5:40 0.9 0.38 0.71 0.34 0.0377 0.0585 17.56 0.00 0.00 0.00 0.00 0.00 17.56 4836.30 67.17 3065.46 0.23 0.00 0.00 5:45 0.6 0.25 0.71 0.23 0.0251 0.0390 11.71 0.00 0.00 0.00 0.00 0.00 11.71 4819.79 66.94 3010.23 0.23 0.00 0.00 5:50 0.5 0.21 0.71 0.19 0.0209 0.0325 9.75 0.00 0.00 0.00 0.00 0.00 9.75 4801.42 66.69 2953.30 0.23 0.00 0.00 5:55 0.3 0.13 0.71 0.11 0.0126 0.0195 5.85 0.00 0.00 0.00 0.00 0.00 5.85 4782.48 66.42 2892.73 0.22 0.00 0.00 6:00
0.2 0.08 0.71 0.08 0.0084 0.0130 3.90 0.00 0.00 0.00 0.00 0.00 3.90 4762.33 66.14 2830.48 0.22 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4741.62 65.86 2764.63 0.21 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4719.71 65.55 2699.08 0.21 0.00 0.00 6:15 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4697.91 65.25 2633.83 0.20 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4676.20 64.95 2568.88 0.20 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4654.59 64.65 2504.23 0.19 0.00 0.00 6:30 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4633.09 64.35 2439.89 0.19 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4611.68 64.05 2375.83 0.18 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4590.37 63.76 2312.08 0.18 0.00 0.00 6:45 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4569.16 63.46 2248.62 0.17 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4548.05 63.17 2185.45 0.17 0.00 0.00 0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4527.04 62.88 2122.58 0.16 0.00 0.00 7:00
0 0.00 0.71 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4506.12 62.59 2059.99 0.16 0.00 0.00 Total volume (cf) 5045.92
Total Overflow (cf) 0.00
5 of 6
24 Hour Storm in 15 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:15 0.2 0.04 1.24 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 0:30 0.3 0.06 1.23 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 0:45 0.3 0.06 1.21 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 1:00
0.4 0.08 1.20 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 1:15 0.3 0.06 1.18 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 1:30 0.3 0.06 1.17 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 1:45 0.3 0.06 1.16 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 2:00
0.4 0.08 1.14 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 2:15 0.4 0.08 1.13 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 2:30 0.4 0.08 1.11 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 2:45 0.5 0.11 1.10 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 3:00
0.5 0.11 1.09 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 3:15 0.5 0.11 1.07 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 3:30 0.5 0.11 1.06 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 3:45 0.5 0.11 1.05 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 4:00
0.6 0.13 1.03 0.11 0.0126 0.0196 17.64 0.00 0.00 0.00 0.00 0.00 17.64 3800.00 17.64 0.00 0.00 0.00 0.00 4:15 0.6 0.13 1.02 0.11 0.0126 0.0196 17.64 0.00 0.00 0.00 0.00 0.00 17.64 3800.00 17.64 0.00 0.00 0.00 0.00 4:30 0.7 0.15 1.01 0.13 0.0147 0.0229 20.58 0.00 0.00 0.00 0.00 0.00 20.58 3800.00 20.58 0.00 0.00 0.00 0.00 4:45 0.7 0.15 0.99 0.13 0.0147 0.0229 20.58 0.00 0.00 0.00 0.00 0.00 20.58 3800.00 20.58 0.00 0.00 0.00 0.00 5:00
0.8 0.17 0.98 0.15 0.0168 0.0261 23.52 0.00 0.00 0.00 0.00 0.00 23.52 3800.00 23.52 0.00 0.00 0.00 0.00 5:15 0.6 0.13 0.97 0.11 0.0126 0.0196 17.64 0.00 0.00 0.00 0.00 0.00 17.64 3800.00 17.64 0.00 0.00 0.00 0.00 5:30 0.7 0.15 0.96 0.13 0.0147 0.0229 20.58 0.00 0.00 0.00 0.00 0.00 20.58 3800.00 20.58 0.00 0.00 0.00 0.00 5:45 0.8 0.17 0.94 0.15 0.0168 0.0261 23.52 0.00 0.00 0.00 0.00 0.00 23.52 3800.00 23.52 0.00 0.00 0.00 0.00 6:00
0.8 0.17 0.93 0.15 0.0168 0.0261 23.52 0.00 0.00 0.00 0.00 0.00 23.52 3800.00 23.52 0.00 0.00 0.00 0.00 6:15 0.9 0.19 0.92 0.17 0.0189 0.0294 26.46 0.00 0.00 0.00 0.00 0.00 26.46 3800.00 26.46 0.00 0.00 0.00 0.00 6:30 0.9 0.19 0.91 0.17 0.0189 0.0294 26.46 0.00 0.00 0.00 0.00 0.00 26.46 3800.00 26.46 0.00 0.00 0.00 0.00 6:45 1 0.21 0.89 0.19 0.0210 0.0327 29.40 0.00 0.00 0.00 0.00 0.00 29.40 3800.00 29.40 0.00 0.00 0.00 0.00 7:00
1 0.21 0.88 0.19 0.0210 0.0327 29.40 0.00 0.00 0.00 0.00 0.00 29.40 3800.00 29.40 0.00 0.00 0.00 0.00 7:15 1 0.21 0.87 0.19 0.0210 0.0327 29.40 0.00 0.00 0.00 0.00 0.00 29.40 3800.00 29.40 0.00 0.00 0.00 0.00 7:30 1.1 0.23 0.86 0.21 0.0231 0.0359 32.34 0.00 0.00 0.00 0.00 0.00 32.34 3800.00 32.34 0.00 0.00 0.00 0.00 7:45 1.2 0.25 0.85 0.23 0.0252 0.0392 35.29 0.00 0.00 0.00 0.00 0.00 35.29 3800.00 35.29 0.00 0.00 0.00 0.00 8:00
1.3 0.27 0.83 0.25 0.0274 0.0425 38.23 0.00 0.00 0.00 0.00 0.00 38.23 3800.00 38.23 0.00 0.00 0.00 0.00 8:15 1.5 0.32 0.82 0.28 0.0316 0.0490 44.11 0.00 0.00 0.00 0.00 0.00 44.11 3800.00 44.11 0.00 0.00 0.00 0.00 8:30 1.5 0.32 0.81 0.28 0.0316 0.0490 44.11 0.00 0.00 0.00 0.00 0.00 44.11 3800.00 44.11 0.00 0.00 0.00 0.00 8:45 1.6 0.34 0.80 0.30 0.0337 0.0523 47.05 0.00 0.00 0.00 0.00 0.00 47.05 3800.00 47.05 0.00 0.00 0.00 0.00 9:00
1.7 0.36 0.79 0.32 0.0358 0.0555 49.99 0.00 0.00 0.00 0.00 0.00 49.99 3800.00 49.99 0.00 0.00 0.00 0.00 9:15 1.9 0.40 0.78 0.36 0.0400 0.0621 55.87 0.00 0.00 0.00 0.00 0.00 55.87 3800.00 55.87 0.00 0.00 0.00 0.00 9:30 2 0.42 0.77 0.38 0.0421 0.0653 58.81 0.00 0.00 0.00 0.00 0.00 58.81 3800.00 58.81 0.00 0.00 0.00 0.00 9:45 2.1 0.44 0.76 0.40 0.0442 0.0686 61.75 0.00 0.00 0.00 0.00 0.00 61.75 3800.00 61.75 0.00 0.00 0.00 0.00 10:00
2.2 0.46 0.74 0.42 0.0463 0.0719 64.69 0.00 0.00 0.00 0.00 0.00 64.69 3800.00 64.69 0.00 0.00 0.00 0.00 10:15 1.5 0.32 0.73 0.28 0.0316 0.0490 44.11 0.00 0.00 0.00 0.00 0.00 44.11 3800.00 44.11 0.00 0.00 0.00 0.00 10:30 1.5 0.32 0.72 0.28 0.0316 0.0490 44.11 0.00 0.00 0.00 0.00 0.00 44.11 3800.00 44.11 0.00 0.00 0.00 0.00 10:45 2 0.42 0.71 0.38 0.0421 0.0653 58.81 0.00 0.00 0.00 0.00 0.00 58.81 3800.00 58.81 0.00 0.00 0.00 0.00 11:00
2 0.42 0.70 0.38 0.0421 0.0653 58.81 0.00 0.00 0.00 0.00 0.00 58.81 3800.00 58.81 0.00 0.00 0.00 0.00 11:15 1.9 0.40 0.69 0.36 0.0400 0.0621 55.87 0.00 0.00 0.00 0.00 0.00 55.87 3800.00 55.87 0.00 0.00 0.00 0.00 11:30 1.9 0.40 0.68 0.36 0.0400 0.0621 55.87 0.00 0.00 0.00 0.00 0.00 55.87 3800.00 55.87 0.00 0.00 0.00 0.00 11:45 1.7 0.36 0.67 0.32 0.0358 0.0555 49.99 0.00 0.00 0.00 0.00 0.00 49.99 3800.00 49.99 0.00 0.00 0.00 0.00 12:00
1.8 0.38 0.66 0.34 0.0379 0.0588 52.93 0.00 0.00 0.00 0.00 0.00 52.93 3800.00 52.93 0.00 0.00 0.00 0.00 12:15 2.5 0.53 0.65 0.47 0.0526 0.0817 73.51 0.00 0.00 0.00 0.00 0.00 73.51 3800.00 73.51 0.00 0.00 0.00 0.00 12:30 2.6 0.55 0.64 0.49 0.0547 0.0849 76.45 0.00 0.00 0.00 0.00 0.00 76.45 3800.00 76.45 0.00 0.00 0.00 0.00 12:45 2.8 0.59 0.63 0.53 0.0589 0.0915 82.33 0.00 0.00 0.00 0.00 0.00 82.33 3800.00 82.33 0.00 0.00 0.00 0.00 6 of 6
13:00
2.9 0.61 0.62 0.55 0.0610 0.0947 85.27 0.00 0.00 0.00 0.00 0.00 85.27 3800.00 85.27 0.00 0.00 0.00 0.00 13:15 3.4 0.72 0.61 N/A 0.1023 0.1588 142.96 0.00 0.00 0.00 0.00 0.00 142.96 3800.00 142.96 0.00 0.00 0.00 0.00 13:30 3.4 0.72 0.60 N/A
0.1116
0.1733
155.96
0.00 0.00 0.00 0.00 0.00 155.96 3800.00 155.96 0.00 0.00 0.00 0.00 13:45 2.3 0.48 0.59 0.44 0.0484 0.0751 67.63 0.00 0.00 0.00 0.00 0.00 67.63 3800.00 67.63 0.00 0.00 0.00 0.00 14:00
2.3 0.48 0.59 0.44 0.0484 0.0751 67.63 0.00 0.00 0.00 0.00 0.00 67.63 3800.00 67.63 0.00 0.00 0.00 0.00 14:15 2.7 0.57 0.58 0.51 0.0568 0.0882 79.39 0.00 0.00 0.00 0.00 0.00 79.39 3800.00 79.39 0.00 0.00 0.00 0.00 14:30 2.6 0.55 0.57 0.49 0.0547 0.0849 76.45 0.00 0.00 0.00 0.00 0.00 76.45 3800.00 76.45 0.00 0.00 0.00 0.00 14:45 2.6 0.55 0.56 0.49 0.0547 0.0849 76.45 0.00 0.00 0.00 0.00 0.00 76.45 3800.00 76.45 0.00 0.00 0.00 0.00 15:00
2.5 0.53 0.55 0.47 0.0526 0.0817 73.51 0.00 0.00 0.00 0.00 0.00 73.51 3800.00 73.51 0.00 0.00 0.00 0.00 15:15 2.4 0.50 0.54 0.45 0.0505 0.0784 70.57 0.00 0.00 0.00 0.00 0.00 70.57 3800.00 70.57 0.00 0.00 0.00 0.00 15:30 2.3 0.48 0.53 0.44 0.0484 0.0751 67.63 0.00 0.00 0.00 0.00 0.00 67.63 3800.00 67.63 0.00 0.00 0.00 0.00 15:45 1.9 0.40 0.53 0.36 0.0400 0.0621 55.87 0.00 0.00 0.00 0.00 0.00 55.87 3800.00 55.87 0.00 0.00 0.00 0.00 16:00
1.9 0.40 0.52 0.36 0.0400 0.0621 55.87 0.00 0.00 0.00 0.00 0.00 55.87 3800.00 55.87 0.00 0.00 0.00 0.00 16:15 0.4 0.08 0.51 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 16:30 0.4 0.08 0.50 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 16:45 0.3 0.06 0.49 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 17:00
0.3 0.06 0.49 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 17:15 0.5 0.11 0.48 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 17:30 0.5 0.11 0.47 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 17:45 0.5 0.11 0.47 0.09 0.0105 0.0163 14.70 0.00 0.00 0.00 0.00 0.00 14.70 3800.00 14.70 0.00 0.00 0.00 0.00 18:00
0.4 0.08 0.46 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 18:15 0.4 0.08 0.45 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 18:30 0.4 0.08 0.45 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 18:45 0.3 0.06 0.44 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 19:00
0.2 0.04 0.43 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 19:15 0.3 0.06 0.43 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 19:30 0.4 0.08 0.42 0.08 0.0084 0.0131 11.76 0.00 0.00 0.00 0.00 0.00 11.76 3800.00 11.76 0.00 0.00 0.00 0.00 19:45 0.3 0.06 0.41 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 20:00
0.2 0.04 0.41 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 20:15 0.3 0.06 0.40 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 20:30 0.3 0.06 0.40 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 20:45 0.3 0.06 0.39 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 21:00
0.2 0.04 0.39 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 21:15 0.3 0.06 0.38 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 21:30 0.2 0.04 0.38 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 21:45 0.3 0.06 0.38 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 22:00
0.2 0.04 0.37 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 22:15 0.3 0.06 0.37 0.06 0.0063 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3800.00 8.82 0.00 0.00 0.00 0.00 22:30 0.2 0.04 0.37 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 22:45 0.2 0.04 0.36 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 23:00
0.2 0.04 0.36 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 23:15 0.2 0.04 0.36 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 23:30 0.2 0.04 0.36 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 23:45 0.2 0.04 0.35 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 24:00
0.2 0.04 0.35 0.04 0.0042 0.0065 5.88 0.00 0.00 0.00 0.00 0.00 5.88 3800.00 5.88 0.00 0.00 0.00 0.00 0 0.00 0.35 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total volume (cf) 3039.42
Total Overflow (cf) 0.00
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations The Wren
T7
Drainage Area (ac.) 0.4200
Unit time (minutes)
5 5 5 15
100 Year Storm Duration (hrs) 1 3 6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70 3.49 5.26
Or data from NOAA interactive website
Soils Group A
AMC index II Runoff Number (plate E-6.1) 32
Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr) 0.74 (AMC II) Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
57 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.) 0.36 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6))
Low Loss Rate Percent (%) 90
Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" someti mes used
(Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((di am/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors Upper sec. (ft.)= 0.0001 Lower sec. (ft.)= 0.0001 Ring diam. (ft.) = 0.0001 Drywell lower max. (cf)= 0.00 Upper m ax.(cf)= 0.00
Gravel bed width around drwyell= 0
Drywell total(cf)= 0.00
Ret. Basin design (area, depth) Top = 24000
s.f.
Bot. = 3700 s.f. Max. Depth (d)= 5 Max. storage= 61872.29 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas vol=(h/3)*(bottom+top+(bottom*top)^0.50) area=bottom+(h/d)*(top-bottom) h=(vol*3)/(bottom+top+(bottom*top)^0.5) (va lues must be non-zero or error occurs)
Outside input from: N/A
1 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 3.7 0.8569 0.3604 N/A 0.4965 0.2103 63.09 0.00 0.00 0.00 0.00 0.00 63.09 3700.00 51.39 11.70 0.00 0.00 0.00 0:10 4.8 1.1117 0.3604 N/A 0.7513 0.3182 95.45 0.00 0.00 0.00 0.00 0.00 95.45 3703.84 51.44 55.71 0.00 0.00 0.00 0:15 5.1 1.1812 0.3604 N/A 0.8208 0.3476 104.28 0.00 0.00 0.00 0.00 0.00 104.28 3718.28 51.64 108.34 0.01 0.00 0.00 0:20 4.9 1.1348 0.3604 N/A 0.7745 0.3280 98.40 0.00 0.00 0.00 0.00 0.00 98.40 3735.55 51.88 154.86 0.01 0.00 0.00 0:25 6.6 1.5286 0.3604 N/A 1.1682 0.4947 148.42 0.00 0.00 0.00 0.00 0.00 148.42 3750.81 52.09 251.18 0.02 0.00 0.00 0:30 7.3 1.6907 0.3604 N/A 1.3303 0.5634 169.01 0.00 0.00 0.00 0.00 0.00 169.01 3782.41 52.53 367.66 0.03 0.00 0.00 0:35 8.4 1.9454 0.3604 N/A 1.5851 0.6713 201.38 0.00 0.00 0.00 0.00 0.00 201.38 3820.63 53.06 515.98 0.04 0.00 0.00 0:40 9 2.0844 0.3604 N/A 1.7240 0.7301 219.04 0.00 0.00 0.00 0.00 0.00 219.04 3869.29 53.74 681.27 0.06 0.00 0.00 0:45 12.3 2.8487 0.3604 N/A 2.4883 1.0538 316.14 0.00 0.00 0.00 0.00 0.00 316.14 3923.52 54.49 942.92 0.08 0.00 0.00 0:50 17.6 4.0762 0.3604 N/A
3.7158 1.5736 472.09
0.00 0.00 0.00 0.00 0.00 472.09 4009.37 55.69 1359.32 0.11 0.00 0.00 0:55 16.1 3.7288 0.3604 N/A 3.3684 1.4265 427.95 0.00 0.00 0.00 0.00 0.00 427.95 4145.99 57.58 1729.69 0.14 0.00 0.00 1:00
4.2 0.9727 0.3604 N/A 0.6123 0.2593 77.80 0.00 0.00 0.00 0.00 0.00 77.80 4267.50 59.27 1748.22 0.14
0.00 0.00
0 0.0000 0.3604 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4273.58 59.36 1688.87 0.14 0.00 0.00 0 0.0000 0.3604 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4254.11 59.08 1629.78 0.13 0.00 0.00 1:15 0 0.0000 0.3604 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4234.72 58.82 1570.96 0.13 0.00 0.00 Total volume (cf) 2393.04
Total Overflow (cf) 0.00
2 of 6
3 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 1.3 0.42 0.36 N/A 0.0608 0.0258 7.73 0.00 0.00 0.00 0.00 0.00 7.73 3700.00 7.73 0.00 0.00 0.00 0.00 0:10 1.3 0.42 0.36 N/A 0.0608 0.0258 7.73 0.00 0.00 0.00 0.00 0.00 7.73 3700.00 7.73 0.00 0.00 0.00 0.00 0:15 1.1 0.36 0.36 0.32 0.0356 0.0151 4.53 0.00 0.00 0.00 0.00 0.00 4.53 3700.00 4.53 0.00 0.00 0.00 0.00 0:20 1.5 0.49 0.36 N/A 0.1256 0.0532 15.96 0.00 0.00 0.00 0.00 0.00 15.96 3700.00 15.96 0.00 0.00 0.00 0.00 0:25 1.5 0.49 0.36 N/A 0.1256 0.0532 15.96 0.00 0.00 0.00 0.00 0.00 15.96 3700.00 15.96 0.00 0.00 0.00 0.00 0:30 1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 3700.00 28.31 0.00 0.00 0.00 0.00 0:35 1.5 0.49 0.36 N/A 0.1256 0.0532 15.96 0.00 0.00 0.00 0.00 0.00 15.96 3700.00 15.96 0.00 0.00 0.00 0.00 0:40 1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 3700.00 28.31 0.00 0.00 0.00 0.00 0:45 1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 3700.00 28.31 0.00 0.00 0.00 0.00 0:50 1.5 0.49 0.36 N/A 0.1256 0.0532 15.96 0.00 0.00 0.00 0.00 0.00 15.96 3700.00 15.96 0.00 0.00 0.00 0.00 0:55 1.6 0.52 0.36 N/A 0.1580 0.0669 20.08 0.00 0.00 0.00 0.00 0.00 20.08 3700.00 20.08 0.00 0.00 0.00 0.00 1:00
1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 3700.00 28.31 0.00 0.00 0.00 0.00 1:05 2.2 0.71 0.36 N/A 0.3524 0.1492 44.77 0.00 0.00 0.00 0.00 0.00 44.77 3700.00 44.77 0.00 0.00 0.00 0.00 1:10 2.2 0.71 0.36 N/A 0.3524 0.1492 44.77 0.00 0.00 0.00 0.00 0.00 44.77 3700.00 44.77 0.00 0.00 0.00 0.00 1:15 2.2 0.71 0.36 N/A 0.3524 0.1492 44.77 0.00 0.00 0.00 0.00 0.00 44.77 3700.00 44.77 0.00 0.00 0.00 0.00 1:20 2 0.65 0.36 N/A 0.2876 0.1218 36.54 0.00 0.00 0.00 0.00 0.00 36.54 3700.00 36.54 0.00 0.00 0.00 0.00 1:25 2.6 0.84 0.36 N/A 0.4820 0.2041 61.24 0.00 0.00 0.00 0.00 0.00 61.24 3700.00 51.39 9.85 0.00 0.00 0.00 1:30 2.7 0.87 0.36 N/A 0.5144 0.2179 65.36 0.00 0.00 0.00 0.00 0.00 65.36 3703.23 51.43 23.78 0.00 0.00 0.00 1:35 2.4 0.78 0.36 N/A 0.4172 0.1767 53.01 0.00 0.00 0.00 0.00 0.00 53.01 3707.80 51.50 25.29 0.00 0.00 0.00 1:40 2.7 0.87 0.36 N/A 0.5144 0.2179 65.36 0.00 0.00 0.00 0.00 0.00 65.36 3708.30 51.50 39.14 0.00 0.00 0.00 1:45 3.3 1.07 0.36 N/A 0.7088 0.3002 90.06 0.00 0.00 0.00 0.00 0.00 90.06 3712.84 51.57 77.63 0.01 0.00 0.00 1:50 3.1 1.00 0.36 N/A 0.6440 0.2727 81.82 0.00 0.00 0.00 0.00 0.00 81.82 3725.47 51.74 107.71 0.01 0.00 0.00 1:55 2.9 0.94 0.36 N/A 0.5792 0.2453 73.59 0.00 0.00 0.00 0.00 0.00 73.59 3735.34 51.88 129.42 0.01 0.00 0.00 2:00
3 0.97 0.36 N/A 0.6116 0.2590 77.71 0.00 0.00 0.00 0.00 0.00 77.71 3742.46 51.98 155.14 0.01 0.00 0.00 2:05 3.1 1.00 0.36 N/A 0.6440 0.2727 81.82 0.00 0.00 0.00 0.00 0.00 81.82 3750.90 52.10 184.87 0.01 0.00 0.00 2:10 4.2 1.36 0.36 N/A 1.0004 0.4237 127.10 0.00 0.00 0.00 0.00 0.00 127.10 3760.66 52.23 259.74 0.02 0.00 0.00 2:15 5 1.62 0.36 N/A 1.2596 0.5334 160.03 0.00 0.00 0.00 0.00 0.00 160.03 3785.22 52.57 367.21 0.03 0.00 0.00 2:20 3.5 1.13 0.36 N/A 0.7736 0.3276 98.29 0.00 0.00 0.00 0.00 0.00 98.29 3820.48 53.06 412.43 0.03 0.00 0.00 2:25 6.8 2.20 0.36 N/A 1.8428 0.7804 234.13 0.00 0.00 0.00 0.00 0.00 234.13 3835.32 53.27 593.29 0.05 0.00 0.00 2:30 7.3 2.37 0.36 N/A 2.0048 0.8490 254.71 0.00 0.00 0.00 0.00 0.00 254.71 3894.66 54.09 793.91 0.06 0.00 0.00 2:35 8.2 2.66 0.36 N/A
2.2964 0.9725 291.76
0.00 0.00 0.00 0.00 0.00 291.76 3960.48 55.01 1030.67 0.08 0.00 0.00 2:40 5.9 1.91 0.36 N/A 1.5512 0.6569 197.08 0.00 0.00 0.00 0.00 0.00 197.08 4038.16 56.09 1171.66 0.09
0.00 0.00
2:45 2 0.65 0.36 N/A 0.2876 0.1218 36.54 0.00 0.00 0.00 0.00 0.00 36.54 4084.42 56.73 1151.48 0.09 0.00 0.00 2:50 1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 4077.79 56.64 1123.15 0.09 0.00 0.00 2:55 1.8 0.58 0.36 N/A 0.2228 0.0944 28.31 0.00 0.00 0.00 0.00 0.00 28.31 4068.50 56.51 1094.95 0.09 0.00 0.00 3:00
0.6 0.19 0.36 0.17 0.0194 0.0082 2.47 0.00 0.00 0.00 0.00 0.00 2.47 4059.25 56.38 1041.05 0.08 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4041.56 56.13 984.91 0.08 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4023.15 55.88 929.04 0.08 0.00 0.00 3:15 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4004.81 55.62 873.41 0.07 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3986.56 55.37 818.04 0.07 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3968.40 55.12 762.93 0.06 0.00 0.00 3:30 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3950.31 54.87 708.06 0.06 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3932.31 54.62 653.45 0.05 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3914.39 54.37 599.08 0.05 0.00 0.00 Total volume (cf) 2496.71
Total Overflow (cf) 0.00
3 of 6
6 Hour Storm in 5 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:05 0.5 0.21 0.36 0.19 0.0209 0.0089 2.66 0.00 0.00 0.00 0.00 0.00 2.66 3700.00 2.66 0.00 0.00 0.00 0.00 0:10 0.6 0.25 0.36 0.23 0.0251 0.0106 3.19 0.00 0.00 0.00 0.00 0.00 3.19 3700.00 3.19 0.00 0.00 0.00 0.00 0:15 0.6 0.25 0.36 0.23 0.0251 0.0106 3.19 0.00 0.00 0.00 0.00 0.00 3.19 3700.00 3.19 0.00 0.00 0.00 0.00 0:20 0.6 0.25 0.36 0.23 0.0251 0.0106 3.19 0.00 0.00 0.00 0.00 0.00 3.19 3700.00 3.19 0.00 0.00 0.00 0.00 0:25 0.6 0.25 0.36 0.23 0.0251 0.0106 3.19 0.00 0.00 0.00 0.00 0.00 3.19 3700.00 3.19 0.00 0.00 0.00 0.00 0:30 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 0:35 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 0:40 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 0:45 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 0:50 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 0:55 0.7 0.29 0.36 0.26 0.0293 0.0124 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3700.00 3.72 0.00 0.00 0.00 0.00 1:00
0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:05 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:10 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:15 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:20 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:25 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:30 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:35 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:40 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:45 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:50 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 1:55 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 2:00
0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:05 0.8 0.34 0.36 0.30 0.0335 0.0142 4.26 0.00 0.00 0.00 0.00 0.00 4.26 3700.00 4.26 0.00 0.00 0.00 0.00 2:10 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:15 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:20 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:25 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:30 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:35 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:40 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 3700.00 4.79 0.00 0.00 0.00 0.00 2:45 1 0.42 0.36 N/A 0.0584 0.0247 7.42 0.00 0.00 0.00 0.00 0.00 7.42 3700.00 7.42 0.00 0.00 0.00 0.00 2:50 1 0.42 0.36 N/A 0.0584 0.0247 7.42 0.00 0.00 0.00 0.00 0.00 7.42 3700.00 7.42 0.00 0.00 0.00 0.00 2:55 1 0.42 0.36 N/A 0.0584 0.0247 7.42 0.00 0.00 0.00 0.00 0.00 7.42 3700.00 7.42 0.00 0.00 0.00 0.00 3:00
1 0.42 0.36 N/A 0.0584 0.0247 7.42 0.00 0.00 0.00 0.00 0.00 7.42 3700.00 7.42 0.00 0.00 0.00 0.00 3:05 1 0.42 0.36 N/A 0.0584 0.0247 7.42 0.00 0.00 0.00 0.00 0.00 7.42 3700.00 7.42 0.00 0.00 0.00 0.00 3:10 1.1 0.46 0.36 N/A 0.1003 0.0425 12.74 0.00 0.00 0.00 0.00 0.00 12.74 3700.00 12.74 0.00 0.00 0.00 0.00 3:15 1.1 0.46 0.36 N/A 0.1003 0.0425 12.74 0.00 0.00 0.00 0.00 0.00 12.74 3700.00 12.74 0.00 0.00 0.00 0.00 3:20 1.1 0.46 0.36 N/A 0.1003 0.0425 12.74 0.00 0.00 0.00 0.00 0.00 12.74 3700.00 12.74 0.00 0.00 0.00 0.00 3:25 1.2 0.50 0.36 N/A 0.1422 0.0602 18.06 0.00 0.00 0.00 0.00 0.00 18.06 3700.00 18.06 0.00 0.00 0.00 0.00 3:30 1.3 0.54 0.36 N/A 0.1841 0.0779 23.38 0.00 0.00 0.00 0.00 0.00 23.38 3700.00 23.38 0.00 0.00 0.00 0.00 3:35 1.4 0.59 0.36 N/A 0.2259 0.0957 28.71 0.00 0.00 0.00 0.00 0.00 28.71 3700.00 28.71 0.00 0.00 0.00 0.00 3:40 1.4 0.59 0.36 N/A 0.2259 0.0957 28.71 0.00 0.00 0.00 0.00 0.00 28.71 3700.00 28.71 0.00 0.00 0.00 0.00 3:45 1.5 0.63 0.36 N/A 0.2678 0.1134 34.03 0.00 0.00 0.00 0.00 0.00 34.03 3700.00 34.03 0.00 0.00 0.00 0.00 3:50 1.5 0.63 0.36 N/A 0.2678 0.1134 34.03 0.00 0.00 0.00 0.00 0.00 34.03 3700.00 34.03 0.00 0.00 0.00 0.00 3:55 1.6 0.67 0.36 N/A 0.3097 0.1312 39.35 0.00 0.00 0.00 0.00 0.00 39.35 3700.00 39.35 0.00 0.00 0.00 0.00 4:00
1.6 0.67 0.36 N/A 0.3097 0.1312 39.35 0.00 0.00 0.00 0.00 0.00 39.35 3700.00 39.35 0.00 0.00 0.00 0.00 4:05 1.7 0.71 0.36 N/A 0.3516 0.1489 44.67 0.00 0.00 0.00 0.00 0.00 44.67 3700.00 44.67 0.00 0.00 0.00 0.00 4:10 1.8 0.75 0.36 N/A 0.3935 0.1666 49.99 0.00 0.00 0.00 0.00 0.00 49.99 3700.00 49.99 0.00 0.00 0.00 0.00 4:15 1.9 0.80 0.36 N/A 0.4353 0.1844 55.31 0.00 0.00 0.00 0.00 0.00 55.31 3700.00 51.39 3.92 0.00 0.00 0.00 4 of 6
4:20 2 0.84 0.36 N/A 0.4772 0.2021 60.63 0.00 0.00 0.00 0.00 0.00 60.63 3701.29 51.41 13.15 0.00 0.00 0.00 4:25 2.1 0.88 0.36 N/A 0.5191 0.2198 65.95 0.00 0.00 0.00 0.00 0.00 65.95 3704.31 51.45 27.65 0.00 0.00 0.00 4:30 2.1 0.88 0.36 N/A 0.5191 0.2198 65.95 0.00 0.00 0.00 0.00 0.00 65.95 3709.07 51.51 42.08 0.00 0.00 0.00 4:35 2.2 0.92 0.36 N/A 0.5610 0.2376 71.27 0.00 0.00 0.00 0.00 0.00 71.27 3713.81 51.58 61.78 0.00 0.00 0.00 4:40 2.3 0.96 0.36 N/A 0.6029 0.2553 76.59 0.00 0.00 0.00 0.00 0.00 76.59 3720.27 51.67 86.70 0.01 0.00 0.00 4:45 2.4 1.01 0.36 N/A 0.6447 0.2730 81.91 0.00 0.00 0.00 0.00 0.00 81.91 3728.45 51.78 116.83 0.01 0.00 0.00 4:50 2.4 1.01 0.36 N/A 0.6447 0.2730 81.91 0.00 0.00 0.00 0.00 0.00 81.91 3738.33 51.92 146.82 0.01 0.00 0.00 4:55 2.5 1.05 0.36 N/A 0.6866 0.2908 87.24 0.00 0.00 0.00 0.00 0.00 87.24 3748.17 52.06 182.00 0.01 0.00 0.00 5:00
2.6 1.09 0.36 N/A 0.7285 0.3085 92.56 0.00 0.00 0.00 0.00 0.00 92.56 3759.71 52.22 222.34 0.02 0.00 0.00 5:05 3.1 1.30 0.36 N/A 0.9379 0.3972 119.16 0.00 0.00 0.00 0.00 0.00 119.16 3772.95 52.40 289.10 0.02 0.00 0.00 5:10 3.6 1.51 0.36 N/A 1.1473 0.4859 145.76 0.00 0.00 0.00 0.00 0.00 145.76 3794.85 52.71 382.15 0.03 0.00 0.00 5:15 3.9 1.63 0.36 N/A 1.2729 0.5391 161.73 0.00 0.00 0.00 0.00 0.00 161.73 3825.38 53.13 490.75 0.04 0.00 0.00 5:20 4.2 1.76 0.36 N/A 1.3986 0.5923 177.69 0.00 0.00 0.00 0.00 0.00 177.69 3861.01 53.63 614.82 0.05 0.00 0.00 5:25 4.7 1.97 0.36 N/A 1.6080 0.6810 204.29 0.00 0.00 0.00 0.00 0.00 204.29 3901.72 54.19 764.92 0.06 0.00 0.00 5:30 5.6 2.35 0.36 N/A
1.9849 0.8406 252.18
0.00 0.00 0.00 0.00 0.00 252.18 3950.97 54.87 962.23 0.08 0.00 0.00 5:35 1.9 0.80 0.36 N/A 0.4353 0.1844 55.31 0.00 0.00 0.00 0.00 0.00 55.31 4015.70 55.77 961.76 0.08
0.00 0.00
5:40 0.9 0.38 0.36 0.34 0.0377 0.0160 4.79 0.00 0.00 0.00 0.00 0.00 4.79 4015.55 55.77 910.78 0.07 0.00 0.00 5:45 0.6 0.25 0.36 0.23 0.0251 0.0106 3.19 0.00 0.00 0.00 0.00 0.00 3.19 3998.82 55.54 858.43 0.07 0.00 0.00 5:50 0.5 0.21 0.36 0.19 0.0209 0.0089 2.66 0.00 0.00 0.00 0.00 0.00 2.66 3981.65 55.30 805.79 0.07 0.00 0.00 5:55 0.3 0.13 0.36 0.11 0.0126 0.0053 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3964.38 55.06 752.33 0.06 0.00 0.00 6:00
0.2 0.08 0.36 0.08 0.0084 0.0035 1.06 0.00 0.00 0.00 0.00 0.00 1.06 3946.84 54.82 698.57 0.06 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3929.20 54.57 644.00 0.05 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3911.29 54.32 589.68 0.05 0.00 0.00 6:15 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3893.47 54.08 535.60 0.04 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3875.73 53.83 481.77 0.04 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3858.07 53.58 428.19 0.03 0.00 0.00 6:30 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3840.49 53.34 374.85 0.03 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3822.99 53.10 321.75 0.03 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3805.57 52.86 268.90 0.02 0.00 0.00 6:45 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3788.22 52.61 216.28 0.02 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3770.96 52.37 163.91 0.01 0.00 0.00 0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3753.78 52.14 111.77 0.01 0.00 0.00 7:00
0 0.00 0.36 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3736.67 51.90 59.87 0.00 0.00 0.00 Total volume (cf) 2415.79
Total Overflow (cf) 0.00
5 of 6
24 Hour Storm in 15 minute increments
Drywell Drywell Drywell Drywell Overflow Basin Basin Basin Time Pattern Storm Loss Rate Value Effective Flow Flow Outside Retention Period Storage Storage To Retention Period Storage Storage Overflow Ov erflow
% Rain (in/hr
)
Max. Min. Rain (in/hr
)
Rate (cfs) Vol. (cf) Input (cf) Area (sf) Perc. (
c
Vol. (cf) Depth (ft) Basin (cf) Area (sf) Perc. (cf) Vol. (cf) Depth (ft )
Vol. (cf) Rate (cfs)
0:15 0.2 0.04 0.63 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 0:30 0.3 0.06 0.63 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 0:45 0.3 0.06 0.62 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 1:00
0.4 0.08 0.61 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 1:15 0.3 0.06 0.60 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 1:30 0.3 0.06 0.60 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 1:45 0.3 0.06 0.59 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 2:00
0.4 0.08 0.58 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 2:15 0.4 0.08 0.58 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 2:30 0.4 0.08 0.57 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 2:45 0.5 0.11 0.56 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 3:00
0.5 0.11 0.55 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 3:15 0.5 0.11 0.55 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 3:30 0.5 0.11 0.54 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 3:45 0.5 0.11 0.53 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 4:00
0.6 0.13 0.53 0.11 0.0126 0.0053 4.81 0.00 0.00 0.00 0.00 0.00 4.81 3700.00 4.81 0.00 0.00 0.00 0.00 4:15 0.6 0.13 0.52 0.11 0.0126 0.0053 4.81 0.00 0.00 0.00 0.00 0.00 4.81 3700.00 4.81 0.00 0.00 0.00 0.00 4:30 0.7 0.15 0.51 0.13 0.0147 0.0062 5.61 0.00 0.00 0.00 0.00 0.00 5.61 3700.00 5.61 0.00 0.00 0.00 0.00 4:45 0.7 0.15 0.51 0.13 0.0147 0.0062 5.61 0.00 0.00 0.00 0.00 0.00 5.61 3700.00 5.61 0.00 0.00 0.00 0.00 5:00
0.8 0.17 0.50 0.15 0.0168 0.0071 6.42 0.00 0.00 0.00 0.00 0.00 6.42 3700.00 6.42 0.00 0.00 0.00 0.00 5:15 0.6 0.13 0.49 0.11 0.0126 0.0053 4.81 0.00 0.00 0.00 0.00 0.00 4.81 3700.00 4.81 0.00 0.00 0.00 0.00 5:30 0.7 0.15 0.49 0.13 0.0147 0.0062 5.61 0.00 0.00 0.00 0.00 0.00 5.61 3700.00 5.61 0.00 0.00 0.00 0.00 5:45 0.8 0.17 0.48 0.15 0.0168 0.0071 6.42 0.00 0.00 0.00 0.00 0.00 6.42 3700.00 6.42 0.00 0.00 0.00 0.00 6:00
0.8 0.17 0.47 0.15 0.0168 0.0071 6.42 0.00 0.00 0.00 0.00 0.00 6.42 3700.00 6.42 0.00 0.00 0.00 0.00 6:15 0.9 0.19 0.47 0.17 0.0189 0.0080 7.22 0.00 0.00 0.00 0.00 0.00 7.22 3700.00 7.22 0.00 0.00 0.00 0.00 6:30 0.9 0.19 0.46 0.17 0.0189 0.0080 7.22 0.00 0.00 0.00 0.00 0.00 7.22 3700.00 7.22 0.00 0.00 0.00 0.00 6:45 1 0.21 0.46 0.19 0.0210 0.0089 8.02 0.00 0.00 0.00 0.00 0.00 8.02 3700.00 8.02 0.00 0.00 0.00 0.00 7:00
1 0.21 0.45 0.19 0.0210 0.0089 8.02 0.00 0.00 0.00 0.00 0.00 8.02 3700.00 8.02 0.00 0.00 0.00 0.00 7:15 1 0.21 0.44 0.19 0.0210 0.0089 8.02 0.00 0.00 0.00 0.00 0.00 8.02 3700.00 8.02 0.00 0.00 0.00 0.00 7:30 1.1 0.23 0.44 0.21 0.0231 0.0098 8.82 0.00 0.00 0.00 0.00 0.00 8.82 3700.00 8.82 0.00 0.00 0.00 0.00 7:45 1.2 0.25 0.43 0.23 0.0252 0.0107 9.62 0.00 0.00 0.00 0.00 0.00 9.62 3700.00 9.62 0.00 0.00 0.00 0.00 8:00
1.3 0.27 0.43 0.25 0.0274 0.0116 10.43 0.00 0.00 0.00 0.00 0.00 10.43 3700.00 10.43 0.00 0.00 0.00 0.00 8:15 1.5 0.32 0.42 0.28 0.0316 0.0134 12.03 0.00 0.00 0.00 0.00 0.00 12.03 3700.00 12.03 0.00 0.00 0.00 0.00 8:30 1.5 0.32 0.41 0.28 0.0316 0.0134 12.03 0.00 0.00 0.00 0.00 0.00 12.03 3700.00 12.03 0.00 0.00 0.00 0.00 8:45 1.6 0.34 0.41 0.30 0.0337 0.0143 12.83 0.00 0.00 0.00 0.00 0.00 12.83 3700.00 12.83 0.00 0.00 0.00 0.00 9:00
1.7 0.36 0.40 0.32 0.0358 0.0151 13.63 0.00 0.00 0.00 0.00 0.00 13.63 3700.00 13.63 0.00 0.00 0.00 0.00 9:15 1.9 0.40 0.40 0.36 0.0400 0.0169 15.24 0.00 0.00 0.00 0.00 0.00 15.24 3700.00 15.24 0.00 0.00 0.00 0.00 9:30 2 0.42 0.39 0.38 0.0421 0.0178 16.04 0.00 0.00 0.00 0.00 0.00 16.04 3700.00 16.04 0.00 0.00 0.00 0.00 9:45 2.1 0.44 0.39 N/A 0.0567 0.0240 21.59 0.00 0.00 0.00 0.00 0.00 21.59 3700.00 21.59 0.00 0.00 0.00 0.00 10:00
2.2 0.46 0.38 N/A 0.0832 0.0353 31.73 0.00 0.00 0.00 0.00 0.00 31.73 3700.00 31.73 0.00 0.00 0.00 0.00 10:15 1.5 0.32 0.37 0.28 0.0316 0.0134 12.03 0.00 0.00 0.00 0.00 0.00 12.03 3700.00 12.03 0.00 0.00 0.00 0.00 10:30 1.5 0.32 0.37 0.28 0.0316 0.0134 12.03 0.00 0.00 0.00 0.00 0.00 12.03 3700.00 12.03 0.00 0.00 0.00 0.00 10:45 2 0.42 0.36 N/A 0.0575 0.0243 21.91 0.00 0.00 0.00 0.00 0.00 21.91 3700.00 21.91 0.00 0.00 0.00 0.00 11:00
2 0.42 0.36 N/A 0.0628 0.0266 23.94 0.00 0.00 0.00 0.00 0.00 23.94 3700.00 23.94 0.00 0.00 0.00 0.00 11:15 1.9 0.40 0.35 N/A 0.0470 0.0199 17.93 0.00 0.00 0.00 0.00 0.00 17.93 3700.00 17.93 0.00 0.00 0.00 0.00 11:30 1.9 0.40 0.35 N/A 0.0523 0.0221 19.92 0.00 0.00 0.00 0.00 0.00 19.92 3700.00 19.92 0.00 0.00 0.00 0.00 11:45 1.7 0.36 0.34 0.32 0.0358 0.0151 13.63 0.00 0.00 0.00 0.00 0.00 13.63 3700.00 13.63 0.00 0.00 0.00 0.00 12:00
1.8 0.38 0.34 N/A 0.0415 0.0176 15.81 0.00 0.00 0.00 0.00 0.00 15.81 3700.00 15.81 0.00 0.00 0.00 0.00 12:15 2.5 0.53 0.33 N/A 0.1938 0.0821 73.86 0.00 0.00 0.00 0.00 0.00 73.86 3700.00 73.86 0.00 0.00 0.00 0.00 12:30 2.6 0.55 0.33 N/A 0.2198 0.0931 83.78 0.00 0.00 0.00 0.00 0.00 83.78 3700.00 83.78 0.00 0.00 0.00 0.00 12:45 2.8 0.59 0.32 N/A 0.2668 0.1130 101.70 0.00 0.00 0.00 0.00 0.00 101.70 3700.00 101.70 0.00 0.00 0.00 0.00 6 of 6
13:00
2.9 0.61 0.32 N/A 0.2927 0.1240 111.57 0.00 0.00 0.00 0.00 0.00 111.57 3700.00 111.57 0.00 0.00 0.00 0.00 13:15 3.4 0.72 0.31 N/A 0.4027 0.1706 153.50 0.00 0.00 0.00 0.00 0.00 153.50 3700.00 153.50 0.00 0.00 0.00 0.00 13:30 3.4 0.72 0.31 N/A
0.4075
0.1726
155.31
0.00 0.00 0.00 0.00 0.00 155.31 3700.00 154.17 1.14 0.00 0.00 0.00 13:45 2.3 0.48 0.30 N/A 0.1807 0.0765 68.88 0.00 0.00 0.00 0.00 0.00 68.88 3700.37 154.18 0.00 0.00 0.00 0.00 14:00
2.3 0.48 0.30 N/A 0.1853 0.0785 70.64 0.00 0.00 0.00 0.00 0.00 70.64 3700.00 70.64 0.00 0.00 0.00 0.00 14:15 2.7 0.57 0.29 N/A 0.2741 0.1161 104.45 0.00 0.00 0.00 0.00 0.00 104.45 3700.00 104.45 0.00 0.00 0.00 0.00 14:30 2.6 0.55 0.29 N/A 0.2575 0.1091 98.15 0.00 0.00 0.00 0.00 0.00 98.15 3700.00 98.15 0.00 0.00 0.00 0.00 14:45 2.6 0.55 0.29 N/A 0.2619 0.1109 99.83 0.00 0.00 0.00 0.00 0.00 99.83 3700.00 99.83 0.00 0.00 0.00 0.00 15:00
2.5 0.53 0.28 N/A 0.2453 0.1039 93.48 0.00 0.00 0.00 0.00 0.00 93.48 3700.00 93.48 0.00 0.00 0.00 0.00 15:15 2.4 0.50 0.28 N/A 0.2285 0.0968 87.10 0.00 0.00 0.00 0.00 0.00 87.10 3700.00 87.10 0.00 0.00 0.00 0.00 15:30 2.3 0.48 0.27 N/A 0.2117 0.0897 80.69 0.00 0.00 0.00 0.00 0.00 80.69 3700.00 80.69 0.00 0.00 0.00 0.00 15:45 1.9 0.40 0.27 N/A 0.1317 0.0558 50.20 0.00 0.00 0.00 0.00 0.00 50.20 3700.00 50.20 0.00 0.00 0.00 0.00 16:00
1.9 0.40 0.26 N/A 0.1358 0.0575 51.76 0.00 0.00 0.00 0.00 0.00 51.76 3700.00 51.76 0.00 0.00 0.00 0.00 16:15 0.4 0.08 0.26 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 16:30 0.4 0.08 0.26 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 16:45 0.3 0.06 0.25 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 17:00
0.3 0.06 0.25 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 17:15 0.5 0.11 0.24 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 17:30 0.5 0.11 0.24 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 17:45 0.5 0.11 0.24 0.09 0.0105 0.0045 4.01 0.00 0.00 0.00 0.00 0.00 4.01 3700.00 4.01 0.00 0.00 0.00 0.00 18:00
0.4 0.08 0.23 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 18:15 0.4 0.08 0.23 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 18:30 0.4 0.08 0.23 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 18:45 0.3 0.06 0.22 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 19:00
0.2 0.04 0.22 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 19:15 0.3 0.06 0.22 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 19:30 0.4 0.08 0.21 0.08 0.0084 0.0036 3.21 0.00 0.00 0.00 0.00 0.00 3.21 3700.00 3.21 0.00 0.00 0.00 0.00 19:45 0.3 0.06 0.21 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 20:00
0.2 0.04 0.21 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 20:15 0.3 0.06 0.21 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 20:30 0.3 0.06 0.20 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 20:45 0.3 0.06 0.20 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 21:00
0.2 0.04 0.20 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 21:15 0.3 0.06 0.20 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 21:30 0.2 0.04 0.19 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 21:45 0.3 0.06 0.19 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 22:00
0.2 0.04 0.19 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 22:15 0.3 0.06 0.19 0.06 0.0063 0.0027 2.41 0.00 0.00 0.00 0.00 0.00 2.41 3700.00 2.41 0.00 0.00 0.00 0.00 22:30 0.2 0.04 0.19 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 22:45 0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 23:00
0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 23:15 0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 23:30 0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 23:45 0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 24:00
0.2 0.04 0.18 0.04 0.0042 0.0018 1.60 0.00 0.00 0.00 0.00 0.00 1.60 3700.00 1.60 0.00 0.00 0.00 0.00 0 0.00 0.18 0.00 0.0000 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total volume (cf) 1998.58
Total Overflow (cf) 0.00
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations
The Wren
OFF1
Drainage Area (ac.)
1.1800
Unit time (minutes)
5 5
5 15
100 Year Storm Duration (hrs)
1 3
6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70
3.49 5.26
Or data from NOAA interactive website
Soils Group
A
AMC index II Runoff Number (plate E-6.1)
32 Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr)
0.74 (AMC II)
Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
90 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.)
0.14 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6)) Low Loss Rate Percent (%)
90 Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" sometimes used (Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((diam/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors
Upper sec. (ft.)=
0.0001
Lower sec. (ft.)=
0.0001
Ring diam. (ft.) =
0.0001
Drywell lower max. (cf)=
0.00 Upper max.(cf)=
0.00 Gravel bed width around drwyell=
0 Drywell total(cf)=
0.00 Ret. Basin design (area, depth)
Top =
0.0001
s.f.
Bot. =
0.0001
s.f.
Max. Depth (d)=
0.0001
Max. storage=
0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas
vol=(h/3)*(bottom+top+(bottom*top)^0.50)
area=bottom+(h/d)*(top-bottom)
h=(vol*3)/(bottom+top+(bottom*top)^0.5)
(values must be non-zero or error occurs)
Outside input from:
N/A
1 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
3.7 0.8569
0.1406
N/A
0.7163
0.8523
255.69
0:10
4.8 1.1117
0.1406
N/A
0.9711
1.1554
346.63
0:15
5.1 1.1812
0.1406
N/A
1.0406
1.2381
371.43
0:20
4.9 1.1348
0.1406
N/A
0.9942
1.1830
354.89
0:25
6.6 1.5286
0.1406
N/A
1.3880
1.6514
495.43
0:30
7.3 1.6907
0.1406
N/A
1.5501
1.8443
553.30
0:35
8.4 1.9454
0.1406
N/A
1.8048
2.1475
644.24
0:40
9 2.0844
0.1406
N/A
1.9438
2.3128
693.84
0:45
12.3 2.8487
0.1406
N/A
2.7081
3.2222
966.65
0:50
17.6 4.0762
0.1406
N/A
3.9356
4.6827
1404.80
0:55
16.1 3.7288
0.1406
N/A
3.5882
4.2693
1280.79
1:00
4.2 0.9727
0.1406
N/A
0.8321
0.9901
297.03
0 0.0000
0.1406
0.00 0.0000
0.0000
0.00 0
0.0000
0.1406
0.00 0.0000
0.0000
0.00 1:15
0 0.0000
0.1406
0.00 0.0000
0.0000
0.00 Total volume (cf)
7664.72
2 of 6
3 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
1.3 0.42
0.14 N/A
0.2806
0.3339
100.16
0:10
1.3 0.42
0.14 N/A
0.2806
0.3339
100.16
0:15
1.1 0.36
0.14 N/A
0.2158
0.2568
77.03 0:20
1.5 0.49
0.14 N/A
0.3454
0.4110
123.29
0:25
1.5 0.49
0.14 N/A
0.3454
0.4110
123.29
0:30
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
0:35
1.5 0.49
0.14 N/A
0.3454
0.4110
123.29
0:40
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
0:45
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
0:50
1.5 0.49
0.14 N/A
0.3454
0.4110
123.29
0:55
1.6 0.52
0.14 N/A
0.3778
0.4495
134.86
1:00
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
1:05
2.2 0.71
0.14 N/A
0.5722
0.6808
204.25
1:10
2.2 0.71
0.14 N/A
0.5722
0.6808
204.25
1:15
2.2 0.71
0.14 N/A
0.5722
0.6808
204.25
1:20
2 0.65
0.14 N/A
0.5074
0.6037
181.12
1:25
2.6 0.84
0.14 N/A
0.7018
0.8350
250.51
1:30
2.7 0.87
0.14 N/A
0.7342
0.8736
262.07
1:35
2.4 0.78
0.14 N/A
0.6370
0.7579
227.38
1:40
2.7 0.87
0.14 N/A
0.7342
0.8736
262.07
1:45
3.3 1.07
0.14 N/A
0.9286
1.1049
331.46
1:50
3.1 1.00
0.14 N/A
0.8638
1.0278
308.33
1:55
2.9 0.94
0.14 N/A
0.7990
0.9507
285.20
2:00
3 0.97
0.14 N/A
0.8314
0.9892
296.77
2:05
3.1 1.00
0.14 N/A
0.8638
1.0278
308.33
2:10
4.2 1.36
0.14 N/A
1.2202
1.4518
435.55
2:15
5 1.62
0.14 N/A
1.4794
1.7602
528.07
2:20
3.5 1.13
0.14 N/A
0.9934
1.1820
354.59
2:25
6.8 2.20
0.14 N/A
2.0626
2.4542
736.25
2:30
7.3 2.37
0.14 N/A
2.2246
2.6469
794.07
2:35
8.2 2.66
0.14 N/A
2.5162
2.9939
898.16
2:40
5.9 1.91
0.14 N/A
1.7710
2.1072
632.16
2:45
2 0.65
0.14 N/A
0.5074
0.6037
181.12
2:50
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
2:55
1.8 0.58
0.14 N/A
0.4426
0.5266
157.99
3:00
0.6 0.19
0.14 N/A
0.0538
0.0640
19.20 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 3:15
0 0.00
0.14 0.00
0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 3:30
0 0.00
0.14 0.00
0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 Total volume (cf)
9758.44
3 of 6
6 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
0.5 0.21
0.14 N/A
0.0688
0.0819
24.56 0:10
0.6 0.25
0.14 N/A
0.1107
0.1317
39.51 0:15
0.6 0.25
0.14 N/A
0.1107
0.1317
39.51 0:20
0.6 0.25
0.14 N/A
0.1107
0.1317
39.51 0:25
0.6 0.25
0.14 N/A
0.1107
0.1317
39.51 0:30
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 0:35
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 0:40
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 0:45
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 0:50
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 0:55
0.7 0.29
0.14 N/A
0.1526
0.1815
54.46 1:00
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:05
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:10
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:15
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:20
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:25
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:30
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:35
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:40
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:45
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:50
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 1:55
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 2:00
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:05
0.8 0.34
0.14 N/A
0.1944
0.2314
69.41 2:10
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:15
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:20
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:25
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:30
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:35
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:40
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 2:45
1 0.42
0.14 N/A
0.2782
0.3310
99.30 2:50
1 0.42
0.14 N/A
0.2782
0.3310
99.30 2:55
1 0.42
0.14 N/A
0.2782
0.3310
99.30 3:00
1 0.42
0.14 N/A
0.2782
0.3310
99.30 3:05
1 0.42
0.14 N/A
0.2782
0.3310
99.30 3:10
1.1 0.46
0.14 N/A
0.3201
0.3808
114.25
3:15
1.1 0.46
0.14 N/A
0.3201
0.3808
114.25
3:20
1.1 0.46
0.14 N/A
0.3201
0.3808
114.25
3:25
1.2 0.50
0.14 N/A
0.3620
0.4307
129.20
3:30
1.3 0.54
0.14 N/A
0.4038
0.4805
144.15
3:35
1.4 0.59
0.14 N/A
0.4457
0.5303
159.10
3:40
1.4 0.59
0.14 N/A
0.4457
0.5303
159.10
3:45
1.5 0.63
0.14 N/A
0.4876
0.5802
174.05
3:50
1.5 0.63
0.14 N/A
0.4876
0.5802
174.05
3:55
1.6 0.67
0.14 N/A
0.5295
0.6300
189.00
4:00
1.6 0.67
0.14 N/A
0.5295
0.6300
189.00
4:05
1.7 0.71
0.14 N/A
0.5714
0.6798
203.95
4:10
1.8 0.75
0.14 N/A
0.6132
0.7297
218.90
4:15
1.9 0.80
0.14 N/A
0.6551
0.7795
233.85
4 of 6
4:20
2 0.84
0.14 N/A
0.6970
0.8293
248.79
4:25
2.1 0.88
0.14 N/A
0.7389
0.8791
263.74
4:30
2.1 0.88
0.14 N/A
0.7389
0.8791
263.74
4:35
2.2 0.92
0.14 N/A
0.7808
0.9290
278.69
4:40
2.3 0.96
0.14 N/A
0.8226
0.9788
293.64
4:45
2.4 1.01
0.14 N/A
0.8645
1.0286
308.59
4:50
2.4 1.01
0.14 N/A
0.8645
1.0286
308.59
4:55
2.5 1.05
0.14 N/A
0.9064
1.0785
323.54
5:00
2.6 1.09
0.14 N/A
0.9483
1.1283
338.49
5:05
3.1 1.30
0.14 N/A
1.1577
1.3774
413.23
5:10
3.6 1.51
0.14 N/A
1.3671
1.6266
487.98
5:15
3.9 1.63
0.14 N/A
1.4927
1.7761
532.83
5:20
4.2 1.76
0.14 N/A
1.6184
1.9256
577.67
5:25
4.7 1.97
0.14 N/A
1.8278
2.1747
652.42
5:30
5.6 2.35
0.14 N/A
2.2047
2.6232
786.96
5:35
1.9 0.80
0.14 N/A
0.6551
0.7795
233.85
5:40
0.9 0.38
0.14 N/A
0.2363
0.2812
84.35 5:45
0.6 0.25
0.14 N/A
0.1107
0.1317
39.51 5:50
0.5 0.21
0.14 N/A
0.0688
0.0819
24.56 5:55
0.3 0.13
0.14 0.11
0.0126
0.0149
4.48 6:00
0.2 0.08
0.14 0.08
0.0084
0.0100
2.99 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 6:15
0 0.00
0.14 0.00
0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 6:30
0 0.00
0.14 0.00
0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 6:45
0 0.00
0.14 0.00
0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 0
0.00 0.14
0.00 0.0000
0.0000
0.00 7:00
0 0.00
0.14 0.00
0.0000
0.0000
0.00 Total volume (cf)
11368.69
5 of 6
24 Hour Storm in 15 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:15
0.2 0.04
0.25 0.04
0.0042
0.0050
4.51 0:30
0.3 0.06
0.24 0.06
0.0063
0.0075
6.76 0:45
0.3 0.06
0.24 0.06
0.0063
0.0075
6.76 1:00
0.4 0.08
0.24 0.08
0.0084
0.0100
9.01 1:15
0.3 0.06
0.24 0.06
0.0063
0.0075
6.76 1:30
0.3 0.06
0.23 0.06
0.0063
0.0075
6.76 1:45
0.3 0.06
0.23 0.06
0.0063
0.0075
6.76 2:00
0.4 0.08
0.23 0.08
0.0084
0.0100
9.01 2:15
0.4 0.08
0.22 0.08
0.0084
0.0100
9.01 2:30
0.4 0.08
0.22 0.08
0.0084
0.0100
9.01 2:45
0.5 0.11
0.22 0.09
0.0105
0.0125
11.27 3:00
0.5 0.11
0.22 0.09
0.0105
0.0125
11.27 3:15
0.5 0.11
0.21 0.09
0.0105
0.0125
11.27 3:30
0.5 0.11
0.21 0.09
0.0105
0.0125
11.27 3:45
0.5 0.11
0.21 0.09
0.0105
0.0125
11.27 4:00
0.6 0.13
0.21 0.11
0.0126
0.0150
13.52 4:15
0.6 0.13
0.20 0.11
0.0126
0.0150
13.52 4:30
0.7 0.15
0.20 0.13
0.0147
0.0175
15.77 4:45
0.7 0.15
0.20 0.13
0.0147
0.0175
15.77 5:00
0.8 0.17
0.20 0.15
0.0168
0.0200
18.02 5:15
0.6 0.13
0.19 0.11
0.0126
0.0150
13.52 5:30
0.7 0.15
0.19 0.13
0.0147
0.0175
15.77 5:45
0.8 0.17
0.19 0.15
0.0168
0.0200
18.02 6:00
0.8 0.17
0.19 0.15
0.0168
0.0200
18.02 6:15
0.9 0.19
0.18 0.17
0.0189
0.0225
20.28 6:30
0.9 0.19
0.18 0.17
0.0189
0.0225
20.28 6:45
1 0.21
0.18 N/A
0.0326
0.0387
34.86 7:00
1 0.21
0.18 N/A
0.0350
0.0416
37.44 7:15
1 0.21
0.17 N/A
0.0373
0.0444
40.00 7:30
1.1 0.23
0.17 N/A
0.0608
0.0723
65.06 7:45
1.2 0.25
0.17 N/A
0.0841
0.1001
90.11 8:00
1.3 0.27
0.17 N/A
0.1075
0.1279
115.13
8:15
1.5 0.32
0.16 N/A
0.1519
0.1807
162.66
8:30
1.5 0.32
0.16 N/A
0.1542
0.1835
165.11
8:45
1.6 0.34
0.16 N/A
0.1775
0.2112
190.07
9:00
1.7 0.36
0.16 N/A
0.2008
0.2389
215.01
9:15
1.9 0.40
0.15 N/A
0.2451
0.2916
262.45
9:30
2 0.42
0.15 N/A
0.2683
0.3193
287.35
9:45
2.1 0.44
0.15 N/A
0.2916
0.3469
312.22
10:00
2.2 0.46
0.15 N/A
0.3148
0.3745
337.07
10:15
1.5 0.32
0.15 N/A
0.1696
0.2018
181.65
10:30
1.5 0.32
0.14 N/A
0.1718
0.2044
183.92
10:45
2 0.42
0.14 N/A
0.2791
0.3320
298.82
11:00
2 0.42
0.14 N/A
0.2811
0.3345
301.05
11:15
1.9 0.40
0.14 N/A
0.2621
0.3119
280.72
11:30
1.9 0.40
0.14 N/A
0.2642
0.3143
282.90
11:45
1.7 0.36
0.13 N/A
0.2241
0.2667
239.99
12:00
1.8 0.38
0.13 N/A
0.2471
0.2941
264.65
12:15
2.5 0.53
0.13 N/A
0.3964
0.4716
424.48
12:30
2.6 0.55
0.13 N/A
0.4194
0.4990
449.09
12:45
2.8 0.59
0.13 N/A
0.4634
0.5513
496.21
6 of 6
13:00
2.9 0.61
0.12 N/A
0.4863
0.5786
520.77
13:15
3.4 0.72
0.12 N/A
0.5934
0.7060
635.43
13:30
3.4 0.72
0.12 N/A
0.5952
0.7082
637.41
13:45
2.3 0.48
0.12 N/A
0.3656
0.4350
391.53
14:00
2.3 0.48
0.12 N/A
0.3674
0.4372
393.46
14:15
2.7 0.57
0.11 N/A
0.4534
0.5394
485.49
14:30
2.6 0.55
0.11 N/A
0.4341
0.5165
464.83
14:45
2.6 0.55
0.11 N/A
0.4358
0.5185
466.68
15:00
2.5 0.53
0.11 N/A
0.4165
0.4955
445.98
15:15
2.4 0.50
0.11 N/A
0.3971
0.4725
425.24
15:30
2.3 0.48
0.11 N/A
0.3777
0.4494
404.48
15:45
1.9 0.40
0.10 N/A
0.2952
0.3512
316.09
16:00
1.9 0.40
0.10 N/A
0.2968
0.3531
317.80
16:15
0.4 0.08
0.10 0.08
0.0084
0.0100
9.01 16:30
0.4 0.08
0.10 0.08
0.0084
0.0100
9.01 16:45
0.3 0.06
0.10 0.06
0.0063
0.0075
6.76 17:00
0.3 0.06
0.10 0.06
0.0063
0.0075
6.76 17:15
0.5 0.11
0.10 0.09
0.0105
0.0125
11.27 17:30
0.5 0.11
0.09 N/A
0.0112
0.0133
12.00 17:45
0.5 0.11
0.09 N/A
0.0126
0.0150
13.50 18:00
0.4 0.08
0.09 0.08
0.0084
0.0100
9.01 18:15
0.4 0.08
0.09 0.08
0.0084
0.0100
9.01 18:30
0.4 0.08
0.09 0.08
0.0084
0.0100
9.01 18:45
0.3 0.06
0.09 0.06
0.0063
0.0075
6.76 19:00
0.2 0.04
0.09 0.04
0.0042
0.0050
4.51 19:15
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 19:30
0.4 0.08
0.08 0.08
0.0084
0.0100
9.01 19:45
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 20:00
0.2 0.04
0.08 0.04
0.0042
0.0050
4.51 20:15
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 20:30
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 20:45
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 21:00
0.2 0.04
0.08 0.04
0.0042
0.0050
4.51 21:15
0.3 0.06
0.08 0.06
0.0063
0.0075
6.76 21:30
0.2 0.04
0.08 0.04
0.0042
0.0050
4.51 21:45
0.3 0.06
0.07 0.06
0.0063
0.0075
6.76 22:00
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 22:15
0.3 0.06
0.07 0.06
0.0063
0.0075
6.76 22:30
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 22:45
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 23:00
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 23:15
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 23:30
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 23:45
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 24:00
0.2 0.04
0.07 0.04
0.0042
0.0050
4.51 0
0.00 0.07
0.00 0.0000
0.0000
0.00 Total volume (cf)
12155.64
1 of 6
HYDROLOGY CALCULATIONS -
Using the RCFC&WCD Short Cut Unit Hydrograph Method
Area Designations
The Wren
OFF2
Drainage Area (ac.)
0.2100
Unit time (minutes)
5 5
5 15
100 Year Storm Duration (hrs)
1 3
6 24
Total Precipitation (Plates D-4.4,E-5.2, 5.4, 5.6)(in.)
1.93 2.70
3.49 5.26
Or data from NOAA interactive website
Soils Group
A
AMC index II Runoff Number (plate E-6.1)
32 Plate E-6.2 Pervious Area Loss Rate (Fp)(in/hr)
0.74 (AMC II)
Percentage of Impervious Cover (Ai)(%) (plate E-6.3)
55.5 Weighted Average Loss Rate (F=Fp(1-.9Ai))(in./hr.)
0.37 (used for 1, 3, and 6 hour storm, the 24 hour storm uses variable maximum loss rate per plate E-1.1 (3 of 6)) Low Loss Rate Percent (%)
90 Retention Basin Percolation Rate (in/hr)
2 (also used for drywell percolation rate)
Percolation is taken incrementally.
Basin volume is calculated using the "truncated pyramid" formula, a more conservative estimate than "averaged end areas" sometimes used (Drywell can be "zeroed out" by reducing numbers to less than .001, but should not entered as zeros or program chokes.) Drywell storage includes 40% of the 1' wide rock bed surrounding the drywell: formula (upper)*PI()*(diam/2)^2+(lower)*PI()*((diam/2)^2+0.4*((diam/2+(grav+0.4166))^2-(diam/2+0.4166)^2)) The drywell wall thickness is assumed at 5" (0.4166) and the gravel bed width is variable "grav" Drywell design factors
Upper sec. (ft.)=
0.0001
Lower sec. (ft.)=
0.0001
Ring diam. (ft.) =
0.0001
Drywell lower max. (cf)=
0.00 Upper max.(cf)=
0.00 Gravel bed width around drwyell=
0 Drywell total(cf)=
0.00 Ret. Basin design (area, depth)
Top =
0.0001
s.f.
Bot. =
0.0001
s.f.
Max. Depth (d)=
0.0001
Max. storage=
0.00 (d/3)*(bottom+top+(bottom*top)^0.50)
Formulas
vol=(h/3)*(bottom+top+(bottom*top)^0.50)
area=bottom+(h/d)*(top-bottom)
h=(vol*3)/(bottom+top+(bottom*top)^0.5)
(values must be non-zero or error occurs)
Outside input from:
N/A
1 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
3.7 0.8569
0.3704
N/A
0.4866
0.1030
30.91 0:10
4.8 1.1117
0.3704
N/A
0.7413
0.1570
47.09 0:15
5.1 1.1812
0.3704
N/A
0.8108
0.1717
51.51 0:20
4.9 1.1348
0.3704
N/A
0.7645
0.1619
48.56 0:25
6.6 1.5286
0.3704
N/A
1.1582
0.2452
73.57 0:30
7.3 1.6907
0.3704
N/A
1.3203
0.2796
83.87 0:35
8.4 1.9454
0.3704
N/A
1.5751
0.3335
100.06
0:40
9 2.0844
0.3704
N/A
1.7140
0.3629
108.88
0:45
12.3 2.8487
0.3704
N/A
2.4783
0.5248
157.43
0:50
17.6 4.0762
0.3704
N/A
3.7058
0.7847
235.41
0:55
16.1 3.7288
0.3704
N/A
3.3584
0.7111
213.34
1:00
4.2 0.9727
0.3704
N/A
0.6024
0.1275
38.26 0
0.0000
0.3704
0.00 0.0000
0.0000
0.00 0
0.0000
0.3704
0.00 0.0000
0.0000
0.00 1:15
0 0.0000
0.3704
0.00 0.0000
0.0000
0.00 Total volume (cf)
1188.91
2 of 6
3 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
1.3 0.42
0.37 N/A
0.0508
0.0108
3.23 0:10
1.3 0.42
0.37 N/A
0.0508
0.0108
3.23 0:15
1.1 0.36
0.37 0.32
0.0356
0.0075
2.26 0:20
1.5 0.49
0.37 N/A
0.1156
0.0245
7.35 0:25
1.5 0.49
0.37 N/A
0.1156
0.0245
7.35 0:30
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 0:35
1.5 0.49
0.37 N/A
0.1156
0.0245
7.35 0:40
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 0:45
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 0:50
1.5 0.49
0.37 N/A
0.1156
0.0245
7.35 0:55
1.6 0.52
0.37 N/A
0.1480
0.0313
9.40 1:00
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 1:05
2.2 0.71
0.37 N/A
0.3424
0.0725
21.75 1:10
2.2 0.71
0.37 N/A
0.3424
0.0725
21.75 1:15
2.2 0.71
0.37 N/A
0.3424
0.0725
21.75 1:20
2 0.65
0.37 N/A
0.2776
0.0588
17.64 1:25
2.6 0.84
0.37 N/A
0.4720
0.1000
29.99 1:30
2.7 0.87
0.37 N/A
0.5044
0.1068
32.04 1:35
2.4 0.78
0.37 N/A
0.4072
0.0862
25.87 1:40
2.7 0.87
0.37 N/A
0.5044
0.1068
32.04 1:45
3.3 1.07
0.37 N/A
0.6988
0.1480
44.39 1:50
3.1 1.00
0.37 N/A
0.6340
0.1343
40.28 1:55
2.9 0.94
0.37 N/A
0.5692
0.1205
36.16 2:00
3 0.97
0.37 N/A
0.6016
0.1274
38.22 2:05
3.1 1.00
0.37 N/A
0.6340
0.1343
40.28 2:10
4.2 1.36
0.37 N/A
0.9904
0.2097
62.92 2:15
5 1.62
0.37 N/A
1.2496
0.2646
79.38 2:20
3.5 1.13
0.37 N/A
0.7636
0.1617
48.51 2:25
6.8 2.20
0.37 N/A
1.8328
0.3881
116.43
2:30
7.3 2.37
0.37 N/A
1.9948
0.4224
126.72
2:35
8.2 2.66
0.37 N/A
2.2864
0.4842
145.25
2:40
5.9 1.91
0.37 N/A
1.5412
0.3264
97.91 2:45
2 0.65
0.37 N/A
0.2776
0.0588
17.64 2:50
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 2:55
1.8 0.58
0.37 N/A
0.2128
0.0451
13.52 3:00
0.6 0.19
0.37 0.17
0.0194
0.0041
1.23 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 3:15
0 0.00
0.37 0.00
0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 3:30
0 0.00
0.37 0.00
0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 Total volume (cf)
1226.78
3 of 6
6 Hour Storm in 5 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:05
0.5 0.21
0.37 0.19
0.0209
0.0044
1.33 0:10
0.6 0.25
0.37 0.23
0.0251
0.0053
1.60 0:15
0.6 0.25
0.37 0.23
0.0251
0.0053
1.60 0:20
0.6 0.25
0.37 0.23
0.0251
0.0053
1.60 0:25
0.6 0.25
0.37 0.23
0.0251
0.0053
1.60 0:30
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 0:35
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 0:40
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 0:45
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 0:50
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 0:55
0.7 0.29
0.37 0.26
0.0293
0.0062
1.86 1:00
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:05
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:10
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:15
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:20
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:25
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:30
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:35
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:40
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:45
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:50
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 1:55
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 2:00
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:05
0.8 0.34
0.37 0.30
0.0335
0.0071
2.13 2:10
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:15
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:20
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:25
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:30
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:35
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:40
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 2:45
1 0.42
0.37 N/A
0.0484
0.0103
3.08 2:50
1 0.42
0.37 N/A
0.0484
0.0103
3.08 2:55
1 0.42
0.37 N/A
0.0484
0.0103
3.08 3:00
1 0.42
0.37 N/A
0.0484
0.0103
3.08 3:05
1 0.42
0.37 N/A
0.0484
0.0103
3.08 3:10
1.1 0.46
0.37 N/A
0.0903
0.0191
5.74 3:15
1.1 0.46
0.37 N/A
0.0903
0.0191
5.74 3:20
1.1 0.46
0.37 N/A
0.0903
0.0191
5.74 3:25
1.2 0.50
0.37 N/A
0.1322
0.0280
8.40 3:30
1.3 0.54
0.37 N/A
0.1741
0.0369
11.06 3:35
1.4 0.59
0.37 N/A
0.2160
0.0457
13.72 3:40
1.4 0.59
0.37 N/A
0.2160
0.0457
13.72 3:45
1.5 0.63
0.37 N/A
0.2578
0.0546
16.38 3:50
1.5 0.63
0.37 N/A
0.2578
0.0546
16.38 3:55
1.6 0.67
0.37 N/A
0.2997
0.0635
19.04 4:00
1.6 0.67
0.37 N/A
0.2997
0.0635
19.04 4:05
1.7 0.71
0.37 N/A
0.3416
0.0723
21.70 4:10
1.8 0.75
0.37 N/A
0.3835
0.0812
24.36 4:15
1.9 0.80
0.37 N/A
0.4254
0.0901
27.02 4 of 6
4:20
2 0.84
0.37 N/A
0.4672
0.0989
29.68 4:25
2.1 0.88
0.37 N/A
0.5091
0.1078
32.34 4:30
2.1 0.88
0.37 N/A
0.5091
0.1078
32.34 4:35
2.2 0.92
0.37 N/A
0.5510
0.1167
35.00 4:40
2.3 0.96
0.37 N/A
0.5929
0.1255
37.66 4:45
2.4 1.01
0.37 N/A
0.6348
0.1344
40.32 4:50
2.4 1.01
0.37 N/A
0.6348
0.1344
40.32 4:55
2.5 1.05
0.37 N/A
0.6766
0.1433
42.98 5:00
2.6 1.09
0.37 N/A
0.7185
0.1521
45.64 5:05
3.1 1.30
0.37 N/A
0.9279
0.1965
58.95 5:10
3.6 1.51
0.37 N/A
1.1373
0.2408
72.25 5:15
3.9 1.63
0.37 N/A
1.2630
0.2674
80.23 5:20
4.2 1.76
0.37 N/A
1.3886
0.2940
88.21 5:25
4.7 1.97
0.37 N/A
1.5980
0.3384
101.51
5:30
5.6 2.35
0.37 N/A
1.9749
0.4182
125.46
5:35
1.9 0.80
0.37 N/A
0.4254
0.0901
27.02 5:40
0.9 0.38
0.37 0.34
0.0377
0.0080
2.39 5:45
0.6 0.25
0.37 0.23
0.0251
0.0053
1.60 5:50
0.5 0.21
0.37 0.19
0.0209
0.0044
1.33 5:55
0.3 0.13
0.37 0.11
0.0126
0.0027
0.80 6:00
0.2 0.08
0.37 0.08
0.0084
0.0018
0.53 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 6:15
0 0.00
0.37 0.00
0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 6:30
0 0.00
0.37 0.00
0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 6:45
0 0.00
0.37 0.00
0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 0
0.00 0.37
0.00 0.0000
0.0000
0.00 7:00
0 0.00
0.37 0.00
0.0000
0.0000
0.00 Total volume (cf)
1185.68
5 of 6
24 Hour Storm in 15 minute increments
Time
Pattern
Storm
Loss Rate Value
Effective
Flow
Flow
%
Rain (in/hr)
Max.
Min.
Rain (in/hr)
Rate (cfs)
Vol. (cf)
0:15
0.2 0.04
0.65 0.04
0.0042
0.0009
0.80 0:30
0.3 0.06
0.64 0.06
0.0063
0.0013
1.20 0:45
0.3 0.06
0.64 0.06
0.0063
0.0013
1.20 1:00
0.4 0.08
0.63 0.08
0.0084
0.0018
1.60 1:15
0.3 0.06
0.62 0.06
0.0063
0.0013
1.20 1:30
0.3 0.06
0.61 0.06
0.0063
0.0013
1.20 1:45
0.3 0.06
0.61 0.06
0.0063
0.0013
1.20 2:00
0.4 0.08
0.60 0.08
0.0084
0.0018
1.60 2:15
0.4 0.08
0.59 0.08
0.0084
0.0018
1.60 2:30
0.4 0.08
0.58 0.08
0.0084
0.0018
1.60 2:45
0.5 0.11
0.58 0.09
0.0105
0.0022
2.00 3:00
0.5 0.11
0.57 0.09
0.0105
0.0022
2.00 3:15
0.5 0.11
0.56 0.09
0.0105
0.0022
2.00 3:30
0.5 0.11
0.56 0.09
0.0105
0.0022
2.00 3:45
0.5 0.11
0.55 0.09
0.0105
0.0022
2.00 4:00
0.6 0.13
0.54 0.11
0.0126
0.0027
2.41 4:15
0.6 0.13
0.53 0.11
0.0126
0.0027
2.41 4:30
0.7 0.15
0.53 0.13
0.0147
0.0031
2.81 4:45
0.7 0.15
0.52 0.13
0.0147
0.0031
2.81 5:00
0.8 0.17
0.51 0.15
0.0168
0.0036
3.21 5:15
0.6 0.13
0.51 0.11
0.0126
0.0027
2.41 5:30
0.7 0.15
0.50 0.13
0.0147
0.0031
2.81 5:45
0.8 0.17
0.49 0.15
0.0168
0.0036
3.21 6:00
0.8 0.17
0.49 0.15
0.0168
0.0036
3.21 6:15
0.9 0.19
0.48 0.17
0.0189
0.0040
3.61 6:30
0.9 0.19
0.47 0.17
0.0189
0.0040
3.61 6:45
1 0.21
0.47 0.19
0.0210
0.0045
4.01 7:00
1 0.21
0.46 0.19
0.0210
0.0045
4.01 7:15
1 0.21
0.46 0.19
0.0210
0.0045
4.01 7:30
1.1 0.23
0.45 0.21
0.0231
0.0049
4.41 7:45
1.2 0.25
0.44 0.23
0.0252
0.0053
4.81 8:00
1.3 0.27
0.44 0.25
0.0274
0.0058
5.21 8:15
1.5 0.32
0.43 0.28
0.0316
0.0067
6.01 8:30
1.5 0.32
0.43 0.28
0.0316
0.0067
6.01 8:45
1.6 0.34
0.42 0.30
0.0337
0.0071
6.42 9:00
1.7 0.36
0.41 0.32
0.0358
0.0076
6.82 9:15
1.9 0.40
0.41 0.36
0.0400
0.0085
7.62 9:30
2 0.42
0.40 0.38
0.0421
0.0089
8.02 9:45
2.1 0.44
0.40 N/A
0.0460
0.0097
8.76 10:00
2.2 0.46
0.39 N/A
0.0727
0.0154
13.86 10:15
1.5 0.32
0.38 0.28
0.0316
0.0067
6.01 10:30
1.5 0.32
0.38 0.28
0.0316
0.0067
6.01 10:45
2 0.42
0.37 N/A
0.0474
0.0100
9.03 11:00
2 0.42
0.37 N/A
0.0529
0.0112
10.08 11:15
1.9 0.40
0.36 0.36
0.0400
0.0085
7.62 11:30
1.9 0.40
0.36 N/A
0.0426
0.0090
8.12 11:45
1.7 0.36
0.35 0.32
0.0358
0.0076
6.82 12:00
1.8 0.38
0.35 0.34
0.0379
0.0080
7.22 12:15
2.5 0.53
0.34 N/A
0.1846
0.0391
35.18 12:30
2.6 0.55
0.34 N/A
0.2107
0.0446
40.16 12:45
2.8 0.59
0.33 N/A
0.2579
0.0546
49.15 6 of 6
13:00
2.9 0.61
0.33 N/A
0.2839
0.0601
54.11 13:15
3.4 0.72
0.32 N/A
0.3941
0.0834
75.10 13:30
3.4 0.72
0.32 N/A
0.3989
0.0845
76.03 13:45
2.3 0.48
0.31 N/A
0.1723
0.0365
32.84 14:00
2.3 0.48
0.31 N/A
0.1771
0.0375
33.74 14:15
2.7 0.57
0.30 N/A
0.2659
0.0563
50.67 14:30
2.6 0.55
0.30 N/A
0.2495
0.0528
47.54 14:45
2.6 0.55
0.29 N/A
0.2540
0.0538
48.41 15:00
2.5 0.53
0.29 N/A
0.2375
0.0503
45.26 15:15
2.4 0.50
0.28 N/A
0.2208
0.0468
42.09 15:30
2.3 0.48
0.28 N/A
0.2042
0.0432
38.91 15:45
1.9 0.40
0.28 N/A
0.1243
0.0263
23.68 16:00
1.9 0.40
0.27 N/A
0.1285
0.0272
24.48 16:15
0.4 0.08
0.27 0.08
0.0084
0.0018
1.60 16:30
0.4 0.08
0.26 0.08
0.0084
0.0018
1.60 16:45
0.3 0.06
0.26 0.06
0.0063
0.0013
1.20 17:00
0.3 0.06
0.26 0.06
0.0063
0.0013
1.20 17:15
0.5 0.11
0.25 0.09
0.0105
0.0022
2.00 17:30
0.5 0.11
0.25 0.09
0.0105
0.0022
2.00 17:45
0.5 0.11
0.24 0.09
0.0105
0.0022
2.00 18:00
0.4 0.08
0.24 0.08
0.0084
0.0018
1.60 18:15
0.4 0.08
0.24 0.08
0.0084
0.0018
1.60 18:30
0.4 0.08
0.23 0.08
0.0084
0.0018
1.60 18:45
0.3 0.06
0.23 0.06
0.0063
0.0013
1.20 19:00
0.2 0.04
0.23 0.04
0.0042
0.0009
0.80 19:15
0.3 0.06
0.22 0.06
0.0063
0.0013
1.20 19:30
0.4 0.08
0.22 0.08
0.0084
0.0018
1.60 19:45
0.3 0.06
0.22 0.06
0.0063
0.0013
1.20 20:00
0.2 0.04
0.21 0.04
0.0042
0.0009
0.80 20:15
0.3 0.06
0.21 0.06
0.0063
0.0013
1.20 20:30
0.3 0.06
0.21 0.06
0.0063
0.0013
1.20 20:45
0.3 0.06
0.21 0.06
0.0063
0.0013
1.20 21:00
0.2 0.04
0.20 0.04
0.0042
0.0009
0.80 21:15
0.3 0.06
0.20 0.06
0.0063
0.0013
1.20 21:30
0.2 0.04
0.20 0.04
0.0042
0.0009
0.80 21:45
0.3 0.06
0.20 0.06
0.0063
0.0013
1.20 22:00
0.2 0.04
0.20 0.04
0.0042
0.0009
0.80 22:15
0.3 0.06
0.19 0.06
0.0063
0.0013
1.20 22:30
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 22:45
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 23:00
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 23:15
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 23:30
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 23:45
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 24:00
0.2 0.04
0.19 0.04
0.0042
0.0009
0.80 0
0.00 0.19
0.00 0.0000
0.0000
0.00 Total volume (cf)
962.47
Date
Enter the Area Tributary to this Feature
A
T
=
10.48 acres
I
f
=
0.68 Use the following equation based on the WEF/ASCE Method C = 0.858I
f
3
- 0.78I
f
2
+ 0.774I
f
+ 0.04
C =
0.47 V
u
=
0.19 V
BMP
(ft
3 )=
V
BMP
=
7,228
ft
3 Calculate the design storage volume of the BMP, V
BMP
.
V
U
(in-ac/ac) x A
T
(ac) x 43,560 (ft
2 /ac)
12 (in/ft)
Notes:
Effective Impervious Fraction
Calculate the composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, V
BMP
Calculate V
U
, the 85% Unit Storage Volume V
U
= 0.40 x C
(in*ac)/ac
Drainage Area Number/Name
DMA1
Determine the Effective Impervious Fraction
Type of post-development surface cover
(
use pull down menu
)
Mixed Surface Types
Designed by
Keith Christiansen
County/City Case No
Company Project Number/Name
Date Palm Apartments
Whitewater Watershed
BMP Design Volume, V
BMP
(Rev. 03-2012)
Legend:
Required Entries
Calculated Cells
Company Name
Christiansen & Company
3/1/2024
Company Name:
Date:
Designed by:
County/City Case No.:
A
TRIB
=
10.48 acres
V
BMP
=
6,467
ft
3 I =
2 in/hr
FS =
3 D
1 =
D
1 =
2.7 ft
1 ft
50 ft
10 ft
D
2
=
4.0 ft
D
MAX
=
2.7 ft
z =
4 :1
d
B
=
2.5 ft
A
S
=
2587
ft
2 A
D
=
45000
ft
2 Volume =
32 ft
3 Depth =
1 ft
Area =
32 ft
2 12.0
in
Notes:
a) Tributary Drainage Area (BMP subarea)
Infiltration Basin - Design Procedure (Rev. 06-2014)
BMP ID
Legend:
Required Entries
Ret 1
Calculated Cells
Christiansen & Company
Keith A. Christiansen
Design Volume
b) Enter V
BMP
determined from Section 4.3 of this Handbook
Maximum Depth
a) Infiltration rate
b) Factor of Safety (See Table 1, Appendix B: "Infiltration Testing" from this BMP Handbook)
c) Calculate D
1 I (in/hr) x 48 hrs
12 (in/ft) x FS
d) Enter the depth of freeboard (at least 1 ft)
e) Enter depth to historic high ground water (measured from top
of basin)
f) Enter depth to top of bedrock or impermeable layer (measured from top
of basin)
c) Minimum bottom surface area of basin (A
S
= V
BMP
/d
B
)
g) D
2 is the smaller of:
Depth to groundwater - (10 ft + freeboard) and
Depth to impermeable layer - (5 ft + freeboard)
h) D
MAX
is the smaller value of D
1 and D
2 but shall not exceed 5 feet
Basin Geometry
a) Basin side slopes (no steeper than 4:1)
b) Proposed basin depth (excluding freeboard)
d) Proposed Design Surface Area
Forebay
a) Forebay volume (minimum 0.5% V
BMP
)
b) Forebay depth (height of berm/splashwall. 1 foot min.)
c) Forebay surface area (minimum)
d) Full height notch-type weir
Width (W) =
FF=361.17
PE=360.5
FF=361.27
PE=360.6
FF=361.27
PE=360.6
FF=361.20
PE=360.53
FF=361.20
PE=360.53
FF=361.17
PE=360.5
FF=361.17
PE=360.5
FF=361.50
PE=360.83
FF=361.67
PE=361.0
FF=361.67
PE=361.0
FF=361.67
PE=361.0
FF=361.47
PE=360.8
FF=361.47
PE=360.8
HP
0 .
2 9
%
HP
HP
4 .
2 2
%
2 .
0 1
%
P
O
O
L
L
I
P
3 6
1 .
6 0
1%
1%
BOT=
350.0
BOT=
354.0
350.0
BASIN
RETENTION
BASIN
RET.
BASIN
RET.
PROP. 6"
CURB & GUTTER
PROP. 6'
SIDEWALK
C/L
TC 361.38
FL 360.88
TC 361.18
FL 360.68
(TC 357.52)
(FL 357.02
1.89%
(1.10%)
(TC 355.53)
(FL 355.04)
(TC 352.24)
(FL 351.78)
(TC 352.33)
(FL 351.85)
TC 357.79
FL 357.29
TC 359.53
FL 359.03
TC 361.43
FL 360.76
FL 360.62
FL 360.56
TC 361.14
FL 360.47
TC 362.65
FL 361.98
F
S
3 6
1 .
2 4
CB2
HP
0.50%
HP
GB
1.91%
0 .
5 %
0 .
5 %
0 .
5 %
0.5%
0.5%
HP
0 .
5 %
2 %
2 4
"
H
D
P
E
8" HDPE
8 "
H
D
P
E
8 "
H
D
P
E
2 4
"
H
D
P
E
0 .
5 %
3 0
"
H
D
P
E
EXISTING R/W
EXISTING R/W
N0° 05' 20"E
N
8 9
°
5 6
'
4 6
"
W
N
.
0 0
°
0 1
"
4 3
"
E
779.37'
(
P
R
O
T
E
C
T
I
N
P
L
A
C
E
)
E
X
I
S
T
.
6 '
B
L
O
C
K
W
A
L
L
5 7
1 .
3 3
'
N
.
8 9
°
5 6
"
4 6
"
W
N. 00°05"20" E 754.69'
N. 89°54"51" W
585.53'
P
R
O
P
.
6 '
B
L
O
C
K
W
A
L
L
P
R
O
P
.
6 '
B
L
O
C
K
W
A
L
L
P
R
O
P
.
6 '
B
L
O
C
K
W
A
L
L
CB3
CB4
TC 356.53
FL 356.03
CB5
1 8
"
H
D
P
E
3:1
3 :
1 3
:
1 3
:
1 3
:
1 1.50%
1.50%
0 .
5 0
%
4.25%
F
S
3 6
0 .
6 7
FS 360.67
FS 360.67
0 .
5 0
%
0 .
5 0
%
H
P
0 .
5 0
%
1.50%
1.50%
0 .
5 0
%
2.13%
3.24%
FS 360.67
FS 360.67
FS 360.67
1 .
0 0
%
1.50%
INV. 356.25
TC 360.50
2 %
2%
2%
2%
2%
2 %
2 %
2 %
2 %
2 %
2 %
2%
1.50%
1.50%
1.50%
1.50%
0 .
5 0
%
0.50%
0.50%
0.50%
4.00%
3 .
5 0
%
1 .
5 0
%
FS 360.67
FS 360.67
F
S
3 6
0 .
6 7
FS 360.67
2.28%
GB
1.00%
1 .
5 0
%
2 .
0 0
%
4 .
0 0
%
0 .
5 0
%
5 .
3 0
%
F
S
3 6
0 .
7 0
1%
2 %
2%
2%
2%
2 %
2 %
FS 360.67
2%
2 %
2 %
2%
2%
CB#1
S
=
0 .
0 0
5 3.75%
P
O
O
L
L
I
P
3 6
1 .
6 0
F
S
3 6
1 .
2 4
H
P
FF
3 6
1 .
4 0
FF
361.40
F
S
3 6
1 .
4 6
0 .
5 0
%
1 .
0 0
%
0.50%
0 .
5 0
%
0.50%
0.50%
2%
2%
2 %
2 %
2 %
2%
2 %
2 %
2%
1%
2 %
2 %
1 %
1 %
2%
1%
2%
2%
2%
2%
2%
2 %
2%
2%
2 %
2 %
2%
2 %
2%
2 %
2%
2 %
2 %
2.0%
2.0%
5.9%
5.9%
FS 360.70
FS 360.70
F
S
3 6
0 .
7 0
F
S
3 6
0 .
7 0
FS 360.70
FS 360.70
F
S
3 6
0 .
7 0
1.50%
1 .
0 0
%
0.50%
2.00%
2 .
0 0
%
1 .
0 0
%
0.50%
3:1
2 .
7 3
%
6 .
2 5
%
5 .
1 1
%
F
S
3 6
1 .
4 6
2%
2%
2 %
2 %
2 %
2 %
2%
2%
2%
2%
2%
0 .
5 0
%
0 .
5 0
%
0.50%
2.53%
1.00%
2%
2%
2%
2 %
2%
0.50%
1.00%
0.50%
1.00%
2 %
2%
2%
2 %
2%
2%
F
S
3 6
0 .
7 7
F
S
3 6
0 .
7 7
F
S
3 6
0 .
7 7
F
S
3 6
0 .
7 7
0.50%
5.0%
5 .
0 %
1 .
0 %
1.0%
2%
2%
2%
2%
2%
2%
2%
2%
2%
N. 00°05"20" E 754.69'
N
.
3 0
°
5 4
"
4 0
"
W
2 9
.
1 7
'
5 7
1 .
3 3
'
N
.
8 9
°
5 6
"
4 6
"
W
N
.
0 0
°
0 1
"
4 3
"
E
779.37'
2%
2%
2%
2%
0.50%
1.00%
2%
2 %
2%
0.50%
1.00%
F
S
3 6
0 .
7 7
F
S
3 6
0 .
7 7
F
S
3 6
0 .
9 7
0 .
5 %
F
S
3 6
0 .
9 7
F
S
3 6
0 .
9 7
F
S
3 6
0 .
9 7
F
S
3 6
0 .
9 7
0.50%
4.1%
4 .
1 %
6 .
5 7
%
F
S
3 6
0 .
9 7
0 .
5 %
2%
2%
2%
2%
2 %
2%
2%
2%
2%
2 %
2%
2%
2%
2%
2 %
2%
2%
2%
2%
0.50%
0.50%
0.50%
0.50%
0 .
5 0
%
1.50%
1.50%
1.50%
1.50%
1.50%
1.50%
2.00%
2 .
0 0
%
1.00%
HP
2.70%
1.10%
1.30%
47'
E
X
I
S
T
I
N
G
8 "
C
U
R
B
&
G
U
T
T
E
R
T
O
M
E
R
E
M
O
V
E
D
2%
2%
2%
2 %
2%
2 %
2%
2%
2 %
2%
2%
2%
6 "
H
D
P
E
0 .
5 %
6 "
H
D
P
E
2%
2%
2 %
2%
2%
2%
6 "
H
D
P
E
INV.
353.00
PROPOSED CROSS GUTTER
P
R
O
P
.
S
T
R
E
E
T
L
I
G
H
T
(
T
Y
P
.
)
E
X
I
S
T
I
N
G
3 "
G
A
S
M
A
I
N
13'
30'
E
X
I
S
T
I
N
G
C
A
B
L
E
/
T
E
L
E
E
X
I
S
T
I
N
G
3 "
G
A
S
M
A
I
N
13'
30'
E
X
I
S
T
I
N
G
C
A
B
L
E
/
T
E
L
E
E
X
I
S
T
I
N
G
1 2
"
D
I
P
W
A
T
E
R
M
A
I
N
1 8
'
E
X
I
S
T
I
N
G
8 "
D
I
P
W
A
T
E
R
M
A
I
N
E
X
I
S
T
I
N
G
8 "
D
I
P
W
A
T
E
R
M
A
I
N
E
X
I
S
T
I
N
G
8 "
V
C
P
W
A
T
E
R
M
A
I
N
(TMH=355.78)
(
I
N
V
.
=
3 4
5 .
1 5
)
(
T
M
H
=
3 5
2 .
1 1
)
(INV.=344.10)
5'
5'
6'
P
R
O
P
.
1 .
3 3
'
R
E
T
.
W
A
L
L
P
R
O
P
.
1 .
3 3
'
R
E
T
.
W
A
L
L
PROP. 4'
RET.WALL
6 "
H
D
P
E
6 "
H
D
P
E
T
G
3 6
1 .
3 5
I
N
V
.
3 6
0 .
1 0
T
G
3 6
1 .
3 5
I
N
V
.
3 6
0 .
1 0
T
G
3 6
0 .
5 0
INV. 357.10
T
G
3 6
0 .
5 0
I
N
V
.
3 5
6 .
7 8
25'
1 7
'
17'
17'
1 7
'
2 5
'
1 7
'
2 5
'
1 7
'
17'
25'
17'
17'
17'
2 5
'
25'
17'
17'
25'
17'
17'
9'
9 '
9'
9'
9'
9 '
9'
9'
9'
9'
26'
E
X
I
S
T
I
N
G
1 2
"
C
M
L
/
C
M
C
W
A
T
E
R
M
A
I
N
29'
TC 359.82
FL 359.32
TC 360.83
TP 360.33
TC 360.81
FL 360.31
TC 360.59
FL 360.09
TC 361.65
FL 361.15
TC 361.00
FL 360.50
TC 361.38
FL 360.88
TC 360.26
FL 359.76
TC 360.76
FL 360.26
TC 361. 14
FL 360.64
TC 361. 40
FL 360.90
TC 361.55
FL 361.05
TC 361.5 6
FL 361.06
TC 361.23
FL 360.73
TC 358.98
FL 358.48
INV 354.00
TC 359.89
FL 359.39
TC 359.76
FL 359.26
TC 359.73
FL 359.23
TC 358.89
FL 358.39
TC 359.70
FL 359.20
TC 361.2 3
TP 360.73
TC 360.90
TP 360.40
TC 360.9 0
TP 360.40
TC 360.9 0
TP 360.40
TC 360.90
TP 360.40
TC 360.75
FL 360.25
TC 359.44
FL 358.94
TC 359.80
FL 359.30
TP 361.21
TC 360.10
FL 359.60
TC 360.38
FL 359.88
TC 360.78
FL 360.28
TC 360.56
FL 360.06
TC 360.75
FL 360.25
TC 361.30
FL 360.80
TC 361.10
FL 360.60
TC 359.55
FL 359.05
TC 359.54
FL 359.04
TC 360.22
FL 359.72
TC 361.27
FL 360.77
TC 361.10
FL 360.60
TC 361.10
FL 360.60
TC 361.33
FL 360.83
TC 360.85
TP 360.35
FL 360.2
FL 359.2
TG 35 8.75
TC 3 61.59
FL 361.09
TC 3 60.96
FL 3 60.46
FL 360.8
TC 360.57
FL 360.07
TC 361.66
TP 361.16
TC 361.28
TP 360.78
TC 361.83
FL 361.33
TC 361.34
FL 360.84
TC 361.56
FL 361.06
TC 361.61
FL 361.11
TC 361.50
FL 361.00
TC 361.17
FL 360.67
TC 360.74
TP 360.24
TG 359.53
INV. 355.75
TC 359.95
FL 359.45
TC 360.10
FL 359.60
TC 359.90
FL 359.40
TC 360.09
FL 359.59
TC 361.85
TP 361.35
TC 360.84
TP 360.34
TC 361.06
TP 360.56
TC 361.05
TP 360.55
TC 361.0 5
TP 360.5 5
TC 360.98
TP 360.48
TC 360.99
TP 360.49
TC 362.11
TP 361.61
FL 361.0
TG 359.5 3
INV. 357.75
TC 359.75
TP 359.25
TC 360.0 7
TP 359.57
FL 360.0
HP
TG 359.5 3
INV. 355.75
TC 360.43
TP 359.93
TC 360.90
TP 360.40
TC 360.90
TP 360.40
TC 360.90
TP 360.40
TC 360.90
TP 360.40
TC 360.90
TP 360.40
TC 360.90
TP 360.40
TC 360.50
TP 360.00
FL 359.44
GB
TC 359.20
FL 358.70
TC 361.1 2
FL 360.62
TC 361.3 0
TP 360.8 0
TC 361.13
FL 360.63
TC 360.98
TP 360.48
TC 360.98
TP 360.48
TC 359.52
FL 359.02
TC 360.98
TP 360.48
TC 360.9 8
TP 360.48
TC 361.14
TP 360.64
TC 360.92
TP 360.42
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 360.16
FL 3 59.66
TC 360.74
FL 360.24
TC 3 61.93
FL 3 61.43
TC 361.28
TP 360.78
TC 360.53
FL 360.03
TC 360.86
TP 360.36
TC 361.30
TP 360.80
TC 360. 94
TP 360.44
TC 360.20
FL 359.70
TC 360. 33
FL 359.83
FL 359.86
FL 360.13
TC 3 60.92
FL 3 60.42
FL 359.75
TC 360.90
TP 360.40
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361. 10
TP 360.60
TC 361.10
TP 360.60
TC 361.10
TP 360.60
TC 361.3 6
TP 360.86
TC 361.3 5
TP 360.85
TC 361.3 5
TP 360.85
TC 361.3 5
TP 360.85
TC 361.35
TP 360.85
TC 361.35
TP 360.85
TC 361.3 5
TP 360.85
TC 3 61.35
TP 3 60.85
TC 361.35
TP 360.85
TC 3 61.35
TP 3 60.85
TC 3 61.35
TP 3 60.85
TC 3 61.35
TP 3 60.85
TC 361.35
TP 360.85
TC 361.35
TP 360.85
TC 361.53
FL 361.03
TC 361.55
TP 361.05
TC 361.31
TP 360.81
TC 3 61.42
TP 3 60.92
TC 3 61.43
TP 3 60.93
TC 361.25
TP 360.75
TC 361.50
TP 361.00
TG 360.50
INV. 359.25
TG 360.50
INV. 358.95
TG 360.50
INV. 358.68
TG 360.50
INV. 358.41
TG 360.50
INV. 358.18
FL 360.8
FL 360.7
FL 360.5
TG 360.10
INV. 358.85
TG 360.05
INV. 357.47
TG 360.40
INV. 357.95
TG 360.40
INV. 358.27
TG 360.40
INV. 358.67
TG 360.40
INV. 359.15
TC 359.93
TP 359.43
19'
17'
9'
1 9
'
17'
17'
9'
1 9
'
19'
9'
19'
9'
17'
19'
19'
19'
19'
19'
19'
19'
19'
1 7
'
19'
17'
9'
19'
T
G
3 6
1 .
3 5
I
N
V
.
3 6
0 .
1 0
2%
2%
FS 360.67
HP
HP
2 %
0 .
5 %
HP
0.5%
FL 360.00
HP
TC 360.50
FL 360.00
HP
0.50%
0.50%
PROP. 6" TYPE D CURB
PROP. 6" CURB & GUT TER
2 %
2%
13'
13'
T
O
D
A
T
E
P
A
L
M
D
R
I
V
E
T
O
3 0
T
H
.
A
V
E
.
0.50%
INV. 350.00
3:1
3 :
1 BOT=
1 2
%
2 %
2 %
0.68%
TC 360.96
TP 360.46
HP
0 .
5 0
%
F
S
3 6
1 .
0 7
1 .
0 %
1 .
0 %
F
S
3 6
0 .
6 7
T
G
3 5
9 .
1 0
I
N
V
.
3 5
7 .
0 0
I
N
V
.
3 5
0 .
0 0
T
C
3 6
1 .
0 0
F
S
3 6
0 .
5 0
T
C
3 6
1 .
0 0
F
S
3 6
0 .
5 0
T
C
3 6
1 .
0 0
F
S
3 6
0 .
5 0
T
C
3 6
0 .
7 4
F
L
3 6
0 .
2 4
FF=
359.17
PE=
358.67
D
E
V
E
L
O
P
E
R
T
O
P
R
O
C
E
S
S
A
C
C
E
S
S
A
G
R
E
E
M
E
N
T
W
I
T
H
NORTHGATE CHURC H
(
A
L
L
D
R
A
I
N
A
G
E
F
R
O
M
P
R
O
P
O
S
E
D
S
T
R
E
E
T
S
H
A
L
L
T
E
R
M
I
N
A
T
E
I
N
T
H
E
E
X
I
S
T
I
N
G
(
R
E
G
R
A
D
E
D
)
R
E
T
E
N
T
I
O
N
B
A
S
I
N
)
N
O
T
E
:
V
O
L
U
M
E
O
F
R
E
T
E
N
T
I
O
N
B
A
S
I
N
M
U
S
T
B
E
M
A
I
N
T
A
I
N
E
D
.
1.50%
TC 360.36
FS 359.86
FS 359.35
1.50%
FF=
359.60
PE=
359.10
7'
P
R
O
P
.
6 '
S
I
D
E
W
A
L
K
5'
5'
5'
5'
5'
5'
5'
5'
5'
5 '
5'
5 '
5'
5'
5'
5'
5'
5 '
5'
5'
5'
5'
5 '
5'
5'
5'
5'
5 '
5 '
5'
5 '
5'
5'
5'
5'
5'
5'
5'
5 '
5'
5 '
5'
5'
5'
5'
5 '
5'
5'
5 '
19'
19'
EMERGENCY OVERFLOW
FS 354.90
TC 360.14
TP 359.64
GATE
K.A.C.
C.A.C.
K.A.C.
LOCATION:
BENCH
ELEV.
DESIGN BY:
DRAWN BY:
CHECKED BY:
FILE NO.
DWG. NO.
OF SHEETS
SHEET
DATE
R.C.E. 50083
1 Christiansen & Company
Land Development - Design - Engineering
Est. 2007
5225 Canyon Crest Drive, Ste 251
Riverside, California 92507
Ph: 951-323-4713 Fax: 951-405-8410
email:[email protected]
APPROVED
DATE
REVISION
CORRECTED
APPROVED
"AS BUILT"
BY
BY
DATE
DATE
CONSTRUCTION CONTRACTOR AGREES THAT IN ACCORDANCE WIT H GENERALLY ACCEPTED CONSTRUCTION PRACTICES, CO NSTRUCTION CONTRACTOR WILL BE REQUIRED TO ASSUME SOLE AND CO MPLETE RESPONSIBILITY FOR JOB SITE CONDITIONS DURING THE COURSE OF CONSTRUCTION OF TH E PROJECT, INCLUDING THE SAFETY OF PER SONS AND PROPERTY; THAT THIS REQUIREMENT SHALL BE MADE TO APPLY CONTINUOUSLY AND NOT BE LIMITED T O NORMAL WORKING HOURS, AND CONSTRUCTION CONT RACTOR FURTHER AGREES TO DEFEND INDEMNIFY AND HOLD DESIGN PROFESSIO NAL HARMLESS FROM ANY AND ALL LIABILITY, REAL OR ALLEGED, I N C ONNECTION W ITH THE PERFORMANCE OF WORK ON THIS PROJECT, EXCEPTING LIABILITY ARISING FROM THE SOLE NEGLIGENCE PRIVATE ENGINEERING NOTE:
OF DESIGN PROFESSIONAL.
UNAUTHORIZED CHANGES & USES:
THE ENGINEER PREPARING
THESE PLANS WILL NOT BE RESPONSIBLE FOR, OR LIABLE FOR, UNAUTHORIZED IN WRITING AND MUST BE APPROVED BY THE PREPARER O F THESE PLANS.
CHANGES TO OR USES OF TH ESE PLANS. ALL CHANGES TO THE PLANS MUST BE K.A.C.
C.A.C.
K.A.C.
LOCATION:
BENCHMARK:
ELEV.
PREPARED UNDER THE DIRECT SUPERVISION OF:
DESIGN BY:
DRAWN BY:
CHECKED BY:
CITY OF CATHEDRAL CITY, COUNTY OF RIVERSIDE,
FILE NO.
DWG. NO.
OF SHEETS
SHEET
KEITH A. CHRISTIANSEN
DATE
R.C.E. 50083
1 PRELIMINARY POST HYDROLOGY MAP
APN 670-110-043
1 Christiansen & Company
Land Development - Design - Engineering
Est. 2007
5225 Canyon Crest Drive, Ste 251
Riverside, California 92507
Ph: 951-323-4713 Fax: 951-405-8410
email:[email protected]
THE WREN
APPROVED
DATE
REVISION
CORRECTED
APPROVED
"AS BUILT"
BY
BY
DATE
DATE
THESE PLANS WILL NOT BE RESPONSIBLE FOR, OR LIABLE FOR, UNAUTHORIZED IN WRITING AND MUST BE APPROVED BY THE PREPARER O F THESE PLANS.
CHANGES TO OR USES OF TH ESE PLANS. ALL CHANGES TO THE PLANS MUST BE 116
363.23
BRONZE DISC. IN CONCRETE MONUMENT AT THE
BENCHMARK: FD. CATHEDRAL CITY
NE COR. OF DATE PALM DR. & RAMON RD. APPROX.
XXXXX ROSEMOUNT AVENUE
STATE OF CALIFORNIA
DATE PAL M /RAMON
20 FEET FROM EDGES OF PAVEMENT.
IN THE CITY OF CATHEDRAL CITY, COUNTY OF RIVERSIDE, STATE OF CALIFORNIA THE WREN
EXISTING GENERAL PLAN LAND USE:
PROPOSED GENERAL PLAN LAND USE:
LIQUEFACTION: NO LIQUEFACTION AREA
FEMA FLOOD ZONE DESIGNATION: ZONE X (FLOOD HAZARD IS UNDETERMINED, BUT POSSIBLE) PER FIRM MAP NO. 06065C1579G / DATED: AUGUST 28, 2008
NOTE: 1.
2. THIS MAP INCLUDES THE ENTIRE CONTIGUOUS OWNERSHIP OF THE LAND DIVIDER.
THERE ARE NO KNOWN WELLS ON PROPERTY OR WITHIN 200 FEET OF PROPERTY.
3. THERE ARE NO EXISTING DWELLINGS, BUILDINGS, OR OTHER STRUCTURES KNOWN ON THIS PROPERTY.
4. SUBDIVISION WILL SHOW COMPLIANCE WITH CITY/COUNTY WATER QUALITY MANAGEMENT PER A SEPARATE WQMP REPORT.
REVISIONS:
NO.
DATE:
DESCRIPTION:
CG (GENERAL COMMERCIAL)
RMH (MEDIUM HIGH DENSITY RESIDENTIAL)
EXISTING ZONING:
PROPOSED ZONING:
PCC (PLANNED COMMUNITY COMMERCIAL)
R3 (MULTIPLE FAMILY RESIDENTIAL)
LEGAL DESCRIPTION:
EXISTING GROSS ACREAGE:
PROPOSED NET ACREAGE:
BUILDINGS (138724 SF)
ASPHALT (111774 SF)
CONCRETE (34951 SF)
LANDSCAPE (125947 SF)
ACREAGE:
10.48 ACRES
10.48 ACRES
3.18 ACRES
2.57 ACRES
0.80 ACRES
2.89 ACRES
1.04 ACRES
OWNER / MAINTENANCE ENTITY:
PRIVATE
ASSESSOR'S PARCEL NUMBER: 670-110-043
PROPOSED IMPROVEMENT SCHEDULE: SCHEDULE "A"
SOURCE OF TOPOGRAPHY:
ADDRESS:
DATE OF TOPOGRAPHY:
INLAND AERIAL SURVEYS, INC.
7117 ARLINGTON AVENUE, SUITE "A"
RIVERSIDE, CA 92503
JULY 11, 2023
TELEPHONE: (951) 687-4252
EXHIBIT PREPARER:
ADDRESS:
CONTACT:
CHRISTIANSEN & COMPANY
5225 CANYON CREST DRIVE, SUITE 251
RIVERSIDE, CA 92507
KEITH CHRISTIANSEN
TELEPHONE: (951)323-4713
CONTACT:
STEFAN VOGEL
TELEPHONE: (626) 277-6782
LAND OWNER:
ADDRESS:
DESERT CARE, LLC
31190 CALLE CAYUGA
CATHEDRAL CITY, CA 92234
APPLICANT:
ADDRESS:
CONTACT:
DATA TABLE
COACHELLA VALLEY COMMUNITY DEELOPMENT GROUP, INC
36101 BOB HOPE DRIVE, SUITE E5
RANCHO MIRAGE, CA 92270
STEFAN VOGEL
TELEPHONE:
(626) 277-6782
EXHIBIT DATE: MARCH 4, 2024
PRELIMINARY POST HYDROLOGY MAP
ARCHITECT:
ADDRESS:
CONTACT:
HUMPHREYS & PARTNERS ARCHITECTS, LP
2350 BRISTOL STREET
COSTA MESA, CA 92626
VELY ZAJEC
TELEPHONE: (949)955-4500
LANDSCAPE ARCHITECT:
ADDRESS:
CONTACT:
JSA LANDSCAPE ARCHITECT
19846 COVENTRY LANE
HUNTINGTON BEACH, CA 92646
JIM SHROPE
TELEPHONE: (760)610-9873
GEO/INFILTRATION:
ADDRESS:
CONTACT:
SLADDEN ENGINEERING
45090 GOLF CENTER PARKWAY
INDIO, CA 92201
BRETT ANDERSON
TELEPHONE: (760)863-0713
email:
[email protected]
email:
[email protected]
email:
[email protected]
email:
[email protected]
email:
[email protected]
email:
[email protected]
RETENTION BASIN (45113 SF)
PRIVATE
PRIVATE
PRIVATE
PRIVATE
PRIVATE
EXISTING EASEMENT NOTES:
1 2
AREAS:
UTILITY PURVEYORS:
WATER -
COACHELLA VALLEY WATER DISTRICT
PH: 760-398-2651
SEWER -
COACHELLA VALLEY WATER DISTRICT
PH: 760-398-2651
ELECTRIC -
SOUTHERN CALIFORNIA EDISON
PH: 760-202-4252
GAS -
SOUTHERN CALIFORNIA GAS COMPANY
PH: 800-427-2200
TELEPHONE -
FRONTIER
PH: 760-864-1726
CABLE -
SPECTRUM
PH: 760-346-3714
GEOTECHNICAL:
ADDRESS:
CONTACT:
LANDMARK CONSULTANTS, INC.
77-948 WILDCAT DRIVE
PALM DESERT, CA 92211
GREG M. CHANDRA
TELEPHONE: (760)360-0665
email:
[email protected]
AN EASEMENT FOR STREET PURPOSES IN FAVOR OF THE
COUNTY OF SAN BERNARDINO AS RECORDED IN BOOK 2825
AT PAGE 265, DATED 1/1/61, REC. OF RIVERSIDE COUNTY, CA.
AN EASEMENT FOR PUBLIC HIGHWAY AND PUBLIC UTILITY
PURPOSED IN FAVOR OF THE CITY OF CATHEDRAL CITY AS
RECORDED PER INST. NO. 188899 , DATED 6/6/91, REC. OF
RIVERSIDE COUNTY, CA.
A
A
C
P/L
P/L
DATE PALM DRIVE
C/L
SECTION 15 LINE
VICINITY MAP
NTS
SECTION "A-A"
SCALE: HORIZ. 1"=40'
VISTA CHINO
30TH AVENUE
I
N
T
E
R
S
T
A
T
E
1 0
LANDAU BLVD
McCALLUM WAY
BARISTO RD.
SAN ELJAY AVE.
CYPRESS RD.
ROSEMOUNT AVE.
PROJECT SITE
TOW 369.4
TF 362.4
2 :
1 M
A
X
.
FG 363.4
PROP. 6' BLOCK WALL
FL SWALE
360.6
BLDG 9 PAD=361.0
3 .
9 %
TC 359.55
FL 359.35
TC 360.36
TP 359.86
0 .
5 3
%
TC 360.72
TP 360.22
TC 360.93
TP 360.43
TP 360.45
0 .
5 1
%
FL 359.95
TC 360.86
TP 360.36
0 .
8 0
%
FG 360.7
350.0
RETENTION
BOTTOM
BASIN
TC 360.54
TP 360.14
TC 360.76
TP 360.26
EXIST. R/W
P/L
360
350
3 :
1 3
:
1 APN 670-401-016
PE 357.0
VERT. 1"=4'
360
370
ROSEMOUNT AVE.
INDICATES DECORATIVE CONCRETE
INDICATES FLOWLINE
INDICATES TOP OF CURB
INDICATES TOP OF PAVEMENT
FL
TC
TP
INDICATE LINEAR FEET
L.F.
INDICATES INVERT ELEVATION
INDICATES TOP OF GRATE
INV.
TG
INDICATES PROPERTY LINE
P/L
INDICATES FINISHED HARD SURFACE
FS
INDICATES TOP OF FOOTING
TF
INDICATES TOP OF WALL
TW
INDICATES PLANTER
P
INDICATES FINISHED DIRT
FG
INDICATES BLOCK WALL
INDICATES BOTTOM
BTM
PER LANDSCAPE PLAN
INDICATES PROPOSED ASPHALT
INDICATES EXISTING CONTOUR
INDICATES PROPOSED CONTOUR
(50)
50 INDICATES EXISTING GRADE
EG
LEGEND
BLDG. #4
BLDG. #3
BLDG. #2
BLDG. #1
BLDG. #5
BLDG. #7
BLDG. #12
BLDG. #11
BLDG. #10
BLDG. #9
BLDG. #8
BLDG. #7
1 2
T1
T2
T3
T4
T5
T6
HYDRAULIC DATA
TRIBUTARY
AREA (AC.)
IMP%
Q100 (cfs)
V100 (cf)
T1(CB#1)
1.90 90.0%
7.54 19573
T2(CB#2)
1.17 90.0%
4.64 12053
T3(CB#3)
1.87 90.0%
7.42 19264
T4(CB#4)
3.30 87.3%
13.04 32055
T5(CB#5)
0.52 90.0%
2.06 5357
T6
1.54 5.0%
5.23 6838
ENTIRE PROJECT
10.48 67.9%
40.04 70427
OFF2
OFF1
Q100= 13.04 cfs
V100= 32055 cf
Q100= 7.54 cfs
V100= 19573 cf
Q100= 4.64 cfs
V100= 12053 cf
Q100=7.42 cfs
V100= 19264 cf
Q100= 2.06 cfs
V100= 5357 cf
Q100= 0.78 cfs
V100= 1227 cf
Q100= 4.68 cfs
V100= 12115 cf
OFF1
0.21 90.0%
4.68 12155
OFF2
1.18 55.5%
0.78 1227
100yr-3hr WS=354.98
T4
T7
T7
0.42 57.0%
1.57 2497
Q100= 1.57 cfs
V100= 2497 cf
C/L
DATE PALM DRIVE
43'
16'
(TP 363.3)
(TC 363.0)
(FL 362.3)
2 %
4'
47'
PROP. 8" CURB & GUTTER
PROP.
AC PVMNT
8'
8'
S/W