Rancho Mirage City Council
January 15, 2026

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
PROJECT WORLD MUSEUM EXIST 2 YR EVENT - NORTH
CONCENTRATION POINT: 1
BY MES R. BAZUA, P.E. DATE 3/28/2025

ADJUSTED LOSS RATE
SOIL
GROUP
[Plate C-1]

LAND USE
RI
NUMBER
[Plate E-6.1]

PERVIOUS
AREA

INFILTRATION
RATE
(in/hr)
[Plate E-6.2]

DECIMAL

PERCENT

OF AREA

IMPERVIOUS
[Plate E-6.3]

ADJUSTED

INFILTRATION
RATE
(in/hr)
AREA

AVERAGE

ADJUSTED

INFILTRATION
RATE
(in/hr)
A

COMMERCIAL
32 0.74
90%

0.14 0.00

0.000

0.0000
A

PAVING/HARDSCAPE
32 0.74
100%

0.07 1.24

0.395

0.0292
A
SF - 1 ACRE
32 0.74
20%

0.61 0.00

0.000

0.0000
A
SF - 1/2 ACRE
32 0.74
40%

0.47 0.00

0.000

0.0000
A
SF - 1/4 ACRE
32 0.74
50%

0.41 0.00

0.000

0.0000
A

MF - CONDOMINIUMS
32 0.74
65%

0.31 0.00

0.000

0.0000
A

MF - APARTMENTS
32 0.74
80%

0.21 0.00

0.000

0.0000
A

MOBILE HOME PARKS
32 0.74
75%

0.24 0.00

0.000

0.0000
A

LANDSCAPING
32 0.74
0%

0.74 0.87

0.277

0.2050
A

RETENTION BASINS
32 0.74
0%

0.74 0.00

0.000

0.0000
A

GOLF COURSE
32 0.74
0%

0.74 0.00

0.000

0.0000
D

MOUNTAINOUS
93 0.95
90%

0.18 1.03

0.328

0.0592

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

VARIABLE LOSS
Fm=
C=
Ft=C(24-(T/60))^1.55

LOW LOSS RATE
Where:

T=Time in minutes.

T=1 1/2 unit time for
RATE CURVE (24
-HOUR STORM ONLY)
=
value for each unit
etc.

0.00272
SUM
(24-(T/60))^1.55 + 0.15
= 90%
T=1/2 the unit time for the first time period,

3.14 SUM

0.2935
in/hr

0.146731688

0.00272
(80-90 PERCENT)
To get an average
the second period,
time period, Use
1858
Plate E-2.1

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NORTH
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 0.72
CONSTANT LOSS RATE-in/hr 0.29
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 1.3

0.112

0.29 0.10

0.01 0.04

10.60 2
10 0.17

1.3 0.112

0.29 0.10

0.01 0.04

10.60 3
15 0.25

1.1 0.095

0.29 0.09

0.01 0.03

8.97 4
20 0.33

1.5 0.130

0.29 0.12

0.01 0.04

12.23 5
25 0.42

1.5 0.130

0.29 0.12

0.01 0.04

12.23 6
30 0.50

1.8 0.156

0.29 0.14

0.02 0.05

14.67 7
35 0.58

1.5 0.130

0.29 0.12

0.01 0.04

12.23 8
40 0.67

1.8 0.156

0.29 0.14

0.02 0.05

14.67 9
45 0.75

1.8 0.156

0.29 0.14

0.02 0.05

14.67 10
50 0.83

1.5 0.130

0.29 0.12

0.01 0.04

12.23 11
55 0.92

1.6 0.138

0.29 0.12

0.01 0.04

13.04 12
60 1.00

1.8 0.156

0.29 0.14

0.02 0.05

14.67 13
65 1.08

2.2 0.190

0.29 0.17

0.02 0.06

17.93 14
70 1.17

2.2 0.190

0.29 0.17

0.02 0.06

17.93 15
75 1.25

2.2 0.190

0.29 0.17

0.02 0.06

17.93 16
80 1.33

2.0 0.173

0.29 0.16

0.02 0.05

16.30 17
85 1.42

2.6 0.225

0.29 0.20

0.02 0.07

21.19 18
90 1.50

2.7 0.234

0.29 0.21

0.02 0.07

22.01 19
95 1.58

2.4 0.208

0.29 0.19

0.02 0.07

19.56 20
100

1.67 2.7

0.234

0.29 0.21

0.02 0.07

22.01 21
105

1.75 3.3

0.286

0.29 0.26

0.03 0.09

26.90 22
110

1.83 3.1

0.268

0.29 0.24

0.03 0.08

25.27 23
115

1.92 2.9

0.251

0.29 0.23

0.03 0.08

23.64 24
120

2.00 3.0

0.260

0.29 0.23

0.03 0.08

24.45 25
125

2.08 3.1

0.268

0.29 0.24

0.03 0.08

25.27 26
130

2.17 4.2

0.363

0.29 0.33

0.07 0.22

65.87 27
135

2.25 5.0

0.433

0.29 0.39

0.14 0.44
131.07
28 140

2.33 3.5

0.303

0.29 0.27

0.01 0.03

8.81 29
145

2.42 6.8

0.588

0.29 0.53

0.29 0.93
277.77
30 150

2.50 7.3

0.632

0.29 0.57

0.34 1.06
318.52
31 155

2.58 8.2

0.709

0.29 0.64

0.42 1.31
391.87
32 160

2.67 5.9

0.510

0.29 0.46

0.22 0.68
204.42
33 165

2.75 2.0

0.173

0.29 0.16

0.02 0.05

16.30 34
170

2.83 1.8

0.156

0.29 0.14

0.02 0.05

14.67 35
175

2.92 1.8

0.156

0.29 0.14

0.02 0.05

14.67 36
180

3.00 0.6

0.052

0.29 0.05

0.01 0.02

4.89 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.17 0.04
1895.68

0.04 1880.00

1.31 1859
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NOR -
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.293
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 0.5

0.057

0.29 0.05

0.01 0.02

5.39 2
10 0.17

0.6 0.069

0.29 0.06

0.01 0.02

6.46 3
15 0.25

0.6 0.069

0.29 0.06

0.01 0.02

6.46 4
20 0.33

0.6 0.069

0.29 0.06

0.01 0.02

6.46 5
25 0.42

0.6 0.069

0.29 0.06

0.01 0.02

6.46 6
30 0.50

0.7 0.080

0.29 0.07

0.01 0.03

7.54 7
35 0.58

0.7 0.080

0.29 0.07

0.01 0.03

7.54 8
40 0.67

0.7 0.080

0.29 0.07

0.01 0.03

7.54 9
45 0.75

0.7 0.080

0.29 0.07

0.01 0.03

7.54 10
50 0.83

0.7 0.080

0.29 0.07

0.01 0.03

7.54 11
55 0.92

0.7 0.080

0.29 0.07

0.01 0.03

7.54 12
60 1.00

0.8 0.091

0.29 0.08

0.01 0.03

8.62 13
65 1.08

0.8 0.091

0.29 0.08

0.01 0.03

8.62 14
70 1.17

0.8 0.091

0.29 0.08

0.01 0.03

8.62 15
75 1.25

0.8 0.091

0.29 0.08

0.01 0.03

8.62 16
80 1.33

0.8 0.091

0.29 0.08

0.01 0.03

8.62 17
85 1.42

0.8 0.091

0.29 0.08

0.01 0.03

8.62 18
90 1.50

0.8 0.091

0.29 0.08

0.01 0.03

8.62 19
95 1.58

0.8 0.091

0.29 0.08

0.01 0.03

8.62 20
100

1.67 0.8

0.091

0.29 0.08

0.01 0.03

8.62 21
105

1.75 0.8

0.091

0.29 0.08

0.01 0.03

8.62 22
110

1.83 0.8

0.091

0.29 0.08

0.01 0.03

8.62 23
115

1.92 0.8

0.091

0.29 0.08

0.01 0.03

8.62 24
120

2.00 0.9

0.103

0.29 0.09

0.01 0.03

9.70 25
125

2.08 0.8

0.091

0.29 0.08

0.01 0.03

8.62 26
130

2.17 0.9

0.103

0.29 0.09

0.01 0.03

9.70 27
135

2.25 0.9

0.103

0.29 0.09

0.01 0.03

9.70 28
140

2.33 0.9

0.103

0.29 0.09

0.01 0.03

9.70 29
145

2.42 0.9

0.103

0.29 0.09

0.01 0.03

9.70 30
150

2.50 0.9

0.103

0.29 0.09

0.01 0.03

9.70 31
155

2.58 0.9

0.103

0.29 0.09

0.01 0.03

9.70 32
160

2.67 0.9

0.103

0.29 0.09

0.01 0.03

9.70 33
165

2.75 1.0

0.114

0.29 0.10

0.01 0.04

10.77 34
170

2.83 1.0

0.114

0.29 0.10

0.01 0.04

10.77 35
175

2.92 1.0

0.114

0.29 0.10

0.01 0.04

10.77 36
180

3.00 1.0

0.114

0.29 0.10

0.01 0.04

10.77 37
185

3.08 1.0

0.114

0.29 0.10

0.01 0.04

10.77 38
190

3.17 1.1

0.126

0.29 0.11

0.01 0.04

11.85 39
195

3.25 1.1

0.126

0.29 0.11

0.01 0.04

11.85 40
200

3.33 1.1

0.126

0.29 0.11

0.01 0.04

11.85 41
205

3.42 1.2

0.137

0.29 0.12

0.01 0.04

12.93 42
210

3.50 1.3

0.149

0.29 0.13

0.01 0.05

14.00 43
215

3.58 1.4

0.160

0.29 0.14

0.02 0.05

15.08 44
220

3.67 1.4

0.160

0.29 0.14

0.02 0.05

15.08 45
225

3.75 1.5

0.172

0.29 0.15

0.02 0.05

16.16 46
230

3.83 1.5

0.172

0.29 0.15

0.02 0.05

16.16 47
235

3.92 1.6

0.183

0.29 0.16

0.02 0.06

17.24 48
240

4.00 1.6

0.183

0.29 0.16

0.02 0.06

17.24 49
245

4.08 1.7

0.194

0.29 0.17

0.02 0.06

18.31 50
250

4.17 1.8

0.206

0.29 0.19

0.02 0.06

19.39 51
255

4.25 1.9

0.217

0.29 0.20

0.02 0.07

20.47 52
260

4.33 2.0

0.229

0.29 0.21

0.02 0.07

21.55 53
265

4.42 2.1

0.240

0.29 0.22

0.02 0.08

22.62 54
270

4.50 2.1

0.240

0.29 0.22

0.02 0.08

22.62 55
275

4.58 2.2

0.252

0.29 0.23

0.03 0.08

23.70 56
280

4.67 2.3

0.263

0.29 0.24

0.03 0.08

24.78 1860
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NOR'
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.293
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285

4.75 2.4

0.274

0.29 0.25

0.03 0.09

25.85 58
290

4.83 2.4

0.274

0.29 0.25

0.03 0.09

25.85 59
295

4.92 2.5

0.286

0.29 0.26

0.03 0.09

26.93 60
300

5.00 2.6

0.297

0.29 0.27

0.00 0.01

3.65 61
305

5.08 3.1

0.355

0.29 0.32

0.06 0.19

57.51 62
310

5.17 3.6

0.412

0.29 0.37

0.12 0.37
111.38
63 315

5.25 3.9

0.446

0.29 0.40

0.15 0.48
143.69
64 320

5.33 4.2

0.480

0.29 0.43

0.19 0.59
176.01
65 325

5.42 4.7

0.537

0.29 0.48

0.24 0.77
229.87
66 330

5.50 5.6

0.640

0.29 0.58

0.35 1.09
326.83
67 335

5.58 1.9

0.217

0.29 0.20

0.02 0.07

20.47 68
340

5.67 0.9

0.103

0.29 0.09

0.01 0.03

9.70 69
345

5.75 0.6

0.069

0.29 0.06

0.01 0.02

6.46 70
350

5.83 0.5

0.057

0.29 0.05

0.01 0.02

5.39 71
355

5.92 0.3

0.034

0.29 0.03

0.00 0.01

3.23 72
360

6.00 0.2

0.023

0.29 0.02

0.00 0.01

2.15 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.16 0.04
1843.05

0.04 1827.81

1.09 1861
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NOR
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 3086.9
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2935
MINIMUM LOSS RATE (for var. loss) - in/hr 0.147
LOW LOSS RATE - DECIMAL 0.90
C 0.00272
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15

0.25 0.2

0.011

0.518

0.010

0.001

0.00 3.07
2 30

0.50 0.3

0.016

0.512

0.015

0.002

0.01 4.61
3 45

0.75 0.3

0.016

0.506

0.015

0.002

0.01 4.61
4 60

1.00 0.4

0.022

0.500

0.020

0.002

0.01 6.15
5 75

1.25 0.3

0.016

0.494

0.015

0.002

0.01 4.61
6 90

1.50 0.3

0.016

0.489

0.015

0.002

0.01 4.61
7 105

1.75 0.3

0.016

0.483

0.015

0.002

0.01 4.61
8 120

2.00 0.4

0.022

0.477

0.020

0.002

0.01 6.15
9 135

2.25 0.4

0.022

0.471

0.020

0.002

0.01 6.15
10 150

2.50 0.4

0.022

0.465

0.020

0.002

0.01 6.15
11 165

2.75 0.5

0.027

0.460

0.024

0.003

0.01 7.69
12 180

3.00 0.5

0.027

0.454

0.024

0.003

0.01 7.69
13 195

3.25 0.5

0.027

0.448

0.024

0.003

0.01 7.69
14 210

3.50 0.5

0.027

0.443

0.024

0.003

0.01 7.69
15 225

3.75 0.5

0.027

0.437

0.024

0.003

0.01 7.69
16 240

4.00 0.6

0.033

0.432

0.029

0.003

0.01 9.22
17 255

4.25 0.6

0.033

0.426

0.029

0.003

0.01 9.22
18 270

4.50 0.7

0.038

0.421

0.034

0.004

0.01 10.76
19 285

4.75 0.7

0.038

0.415

0.034

0.004

0.01 10.76
20 300

5.00 0.8

0.044

0.410

0.039

0.004

0.01 12.30
21 315

5.25 0.6

0.033

0.405

0.029

0.003

0.01 9.22
22 330

5.50 0.7

0.038

0.400

0.034

0.004

0.01 10.76
23 345

5.75 0.8

0.044

0.394

0.039

0.004

0.01 12.30
24 360

6.00 0.8

0.044

0.389

0.039

0.004

0.01 12.30
25 375

6.25 0.9

0.049

0.384

0.044

0.005

0.02 13.84
26 390

6.50 0.9

0.049

0.379

0.044

0.005

0.02 13.84
27 405

6.75 1.0

0.054

0.374

0.049

0.005

0.02 15.37
28 420

7.00 1.0

0.054

0.369

0.049

0.005

0.02 15.37
29 435

7.25 1.0

0.054

0.364

0.049

0.005

0.02 15.37
30 450

7.50 1.1

0.060

0.359

0.054

0.006

0.02 16.91
31 465

7.75 1.2

0.065

0.354

0.059

0.007

0.02 18.45
32 480

8.00 1.3

0.071

0.349

0.064

0.007

0.02 19.99
33 495

8.25 1.5

0.082

0.344

0.073

0.008

0.03 23.06
34 510

8.50 1.5

0.082

0.339

0.073

0.008

0.03 23.06
35 525

8.75 1.6

0.087

0.335

0.078

0.009

0.03 24.60
36 540

9.00 1.7

0.092

0.330

0.083

0.009

0.03 26.13
37 555

9.25 1.9

0.103

0.325

0.093

0.010

0.03 29.21
38 570

9.50 2.0

0.109

0.321

0.098

0.011

0.03 30.75
39 585

9.75 2.1

0.114

0.316

0.103

0.011

0.04 32.28
40 600

10.00 2.2

0.120

0.311

0.108

0.012

0.04 33.82
41 615

10.25 1.5

0.082

0.307

0.073

0.008

0.03 23.06
42 630

10.50 1.5

0.082

0.302

0.073

0.008

0.03 23.06
43 645

10.75 2.0

0.109

0.298

0.098

0.011

0.03 30.75
44 660

11.00 2.0

0.109

0.294

0.098

0.011

0.03 30.75
45 675

11.25 1.9

0.103

0.289

0.093

0.010

0.03 29.21
46 690

11.50 1.9

0.103

0.285

0.093

0.010

0.03 29.21
47 705

11.75 1.7

0.092

0.281

0.083

0.009

0.03 26.13
48 720

12.00 1.8

0.098

0.277

0.088

0.010

0.03 27.67
49 735

12.25 2.5

0.136

0.273

0.122

0.014

0.04 38.43
50 750

12.50 2.6

0.141

0.268

0.127

0.014

0.04 39.97
51 765

12.75 2.8

0.152

0.264

0.137

0.015

0.05 43.05
52 780

13.00 2.9

0.158

0.260

0.142

0.016

0.05 44.58
53 795

13.25 3.4

0.185

0.257

0.166

0.018

0.06 52.27
54 810

13.50 3.4

0.185

0.253

0.166

0.018

0.06 52.27
55 825

13.75 2.3

0.125

0.249

0.113

0.013

0.04 35.36
56 840

14.00 2.3

0.125

0.245

0.113

0.013

0.04 35.36
57 855

14.25 2.7

0.147

0.241

0.132

0.015

0.05 41.51
58 870

14.50 2.6

0.141

0.238

0.127

0.014

0.04 39.97
59 885

14.75 2.6

0.141

0.234

0.127

0.014

0.04 39.97
60 900

15.00 2.5

0.136

0.230

0.122

0.014

0.04 38.43
61 915

15.25 2.4

0.131

0.227

0.118

0.013

0.04 36.90
62 930

15.50 2.3

0.125

0.223

0.113

0.013

0.04 35.36
63 945

15.75 1.9

0.103

0.220

0.093

0.010

0.03 29.21
64 960

16.00 1.9

0.103

0.217

0.093

0.010

0.03 29.21
65 975

16.25 0.4

0.022

0.213

0.020

0.002

0.01 6.15
66 990

16.50 0.4

0.022

0.210

0.020

0.002

0.01 6.15
67 1005

16.75 0.3

0.016

0.207

0.015

0.002

0.01 4.61
H
1862
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NOR
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 3086.9
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2935
MINIMUM LOSS RATE (for var. loss) - in/hr 0.147
LOW LOSS RATE - DECIMAL 0.90
C 0.00272
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020

17.00 0.3

0.016

0.204

0.015

0.002

0.01 4.61
69 1035

17.25 0.5

0.027

0.201

0.024

0.003

0.01 7.69
70 1050

17.50 0.5

0.027

0.198

0.024

0.003

0.01 7.69
71 1065

17.75 0.5

0.027

0.195

0.024

0.003

0.01 7.69
72 1080

18.00 0.4

0.022

0.192

0.020

0.002

0.01 6.15
73 1095

18.25 0.4

0.022

0.189

0.020

0.002

0.01 6.15
74 1110

18.50 0.4

0.022

0.186

0.020

0.002

0.01 6.15
75 1125

18.75 0.3

0.016

0.184

0.015

0.002

0.01 4.61
76 1140

19.00 0.2

0.011

0.181

0.010

0.001

0.00 3.07
77 1155

19.25 0.3

0.016

0.178

0.015

0.002

0.01 4.61
78 1170

19.50 0.4

0.022

0.176

0.020

0.002

0.01 6.15
79 1185

19.75 0.3

0.016

0.174

0.015

0.002

0.01 4.61
80 1200

20.00 0.2

0.011

0.171

0.010

0.001

0.00 3.07
81 1215

20.25 0.3

0.016

0.169

0.015

0.002

0.01 4.61
82 1230

20.50 0.3

0.016

0.167

0.015

0.002

0.01 4.61
83 1245

20.75 0.3

0.016

0.165

0.015

0.002

0.01 4.61
84 1260

21.00 0.2

0.011

0.163

0.010

0.001

0.00 3.07
85 1275

21.25 0.3

0.016

0.161

0.015

0.002

0.01 4.61
86 1290

21.50 0.2

0.011

0.159

0.010

0.001

0.00 3.07
87 1305

21.75 0.3

0.016

0.157

0.015

0.002

0.01 4.61
88 1320

22.00 0.2

0.011

0.155

0.010

0.001

0.00 3.07
89 1335

22.25 0.3

0.016

0.154

0.015

0.002

0.01 4.61
90 1350

22.50 0.2

0.011

0.152

0.010

0.001

0.00 3.07
91 1365

22.75 0.2

0.011

0.151

0.010

0.001

0.00 3.07
92 1380

23.00 0.2

0.011

0.150

0.010

0.001

0.00 3.07
93 1395

23.25 0.2

0.011

0.149

0.010

0.001

0.00 3.07
94 1410

23.50 0.2

0.011

0.148

0.010

0.001

0.00 3.07
95 1425

23.75 0.2

0.011

0.147

0.010

0.001

0.00 3.07
96 1440

24.00 0.2

0.011

0.147

0.010

0.001

0.00 3.07

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cult)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cult)
PEAK FLOW (cfs)

0.14 0.04
1550.16

0.04 1537.34

0.06 H
1863
Plate E-2.2

PROJECT: WORLD MUSEUM EXIST 2 YR EVENT - NORTH
JOB # C2026
1 BASIN CHARACTERISTICS

CONTOUR
DEPTH

INCR TOTAL
(ft) (ft)
AREA

INCR TOTAL
(sf) (sf)
VOLUME

INCR TOTAL
(cuft) (cuft) (acre -ft)
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 PERCOLATION CALCULATIONS

PERCOLATION RATE

MAXWELL IV DRYWELLS

NUMBER USED

RATE/DRYWELL

TOTAL DISSIPATED

TOTAL PERCOLATION RATE
0 in/hr
0 0 cfs

0.00 cfs
0 cfs

0.00 cfs
Basin Characteristics

1864

1 JOB # C2026
100 YEAR - 3 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
1 5

0.04 11
11 0
11 -
11 0.00
2 10

0.04 11
21 0
21 -
21 0.00
3 15

0.03 9
30 0
30 -
30 0.00
4 20

0.04 12
42 0
42 -
42 0.00
5 25

0.04 12
55 0
55 -
55 0.00
6 30

0.05 15
69 0
69 -
69 0.00
7 35

0.04 12
82 0
82 -
82 0.00
8 40

0.05 15
96 0
96 -
96 0.00
9 45

0.05 15
111
0 111
-
111

0.00 10
50 0.04
12 123
0 123
-
123

0.00 11
55 0.04
13 136
0 136
-
136

0.00 12
60 0.05
15 151
0 151
-
151

0.00 13
65 0.06
18 169
0 169
-
169

0.00 14
70 0.06
18 187
0 187
-
187

0.00 15
75 0.06
18 205
0 205
-
205

0.00 16
80 0.05
16 221
0 221
-
221

0.01 17
85 0.07
21 242
0 242
-
242

0.01 18
90 0.07
22 264
0 264
-
264

0.01 19
95 0.07
20 284
0 284
-
284

0.01 20
100

0.07 22
306
0 306
-
306

0.01 21
105

0.09 27
333
0 333
-
333

0.01 22
110

0.08 25
358
0 358
-
358

0.01 23
115

0.08 24
381
0 381
-
381

0.01 24
120

0.08 24
406
0 406
-
406

0.01 25
125

0.08 25
431
0 431
-
431

0.01 26
130

0.22 66
497
0 497
-
497

0.01 27
135

0.44 131
628
0 628
-
628

0.01 28
140

0.03 9
637
0 637
-
637

0.01 29
145

0.93 278
915
0 915
-
915

0.02 30
150

1.06 319
1,233
0 1,233
-
1,233

0.03 31
155

1.31 392
1,625
0 1,625
-
1,625

0.04 32
160

0.68 204
1,829
0 1,829
-
1,829

0.04 33
165

0.05 16
1,846
0 1,846
-
1,846

0.04 34
170

0.05 15
1,860
0 1,860
-
1,860

0.04 35
175

0.05 15
1,875
0 1,875
-
1,875

0.04 36
180

0.02 5
1,880
0 1,880
-
1,880

0.04 1865
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
5 2 10
3 15
4 20
5 25
6 30
7 35
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

0.02 5

0.02 6

0.02 6

0.02 6

0.02 6

0.03 8

0.03 8
8 40
9 45
10 50
11 55

0.03 8

0.03 8

0.03 8

0.03 8
12 60

0.03 9
13 65

0.03 9
14 70

0.03 9
15 75

0.03 9
16 80

0.03 9
17 85

0.03 9
18 90

0.03 9
19 95

0.03 9
20 100 0.03 9
21 105 0.03 9
22 110 0.03 9
23 115 0.03 9
24 120 0.03 10
25 125 0.03 9
26 130 0.03 10
27 135 0.03 10
28 140 0.03 10
29 145 0.03 10
30 150 0.03 10
31 155 0.03 10
32 160 0.03 10
33 165 0.04 11
34 170 0.04 11
35 175 0.04 11
36 180 0.04 11
37 185 0.04 11
38 190 0.04 12
39 195 0.04 12
40 200
41 205
42 210
43 215

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
5 12
18 25
31 39
46 0
0 0
0 0
0 0
5 12
18 25
31 39
46 54
0 54
61 0
61 69
0 69
76 0
76 85
0 85
94 0 94
102
0 102
111
0 111
120
0 120
128
0 128
137
0 137
145
0 145
154
0 154
163
0 163
171
0 171
180
0 180
190
0 190
198
0 198
208
0 208
218
0 218
227
0 227
237
0 237
247
0 247
256
0 256
266
0 266
277
0 277
288
0 288
298
0 298
309
0 309
320
0 320
332
0 332
344
0 344

BALANCE IN
BASIN
(cuft) (acre -ft)
5 12
18 25
31 39
46 54
61 69
76 85
94 102
111
120
128
137
145
154
163
171
180
190
198
208
218
227
237
247
256
266
277
288
298
309
320
332
344

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 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

0.00 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.04 12 355 0 355 - 355 0.01

0.04 13 368 0 368 - 368 0.01

0.05 14 382 0 382 - 382 0.01

0.05 15 398 0 398 - 398 0.01
44 220 0.05 15
45 225 0.05 16
46 230 0.05 16
47 235 0.06 17
48 240 0.06 17
49 245 0.06 18
50 250 0.06 19
51 255 0.07 20
52 260 0.07 22
53 265 0.08 23
54 270 0.08 23
55 275 0.08 24
413
0 413
429
0 429
445
0 445
462
0 462
479
0 479
498
0 498
517
0 517
538
0 538
559
0 559
582
0 582
604
0 604
628
0 628
413
429
445
462
479
498
517
538
559
582
604
628

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01
1866
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
56 280

0.08 25
653
0 653
-
653

0.01 57
285

0.09 26
679
0 679
-
679

0.02 58
290

0.09 26
705
0 705
-
705

0.02 59
295

0.09 27
731
0 731
-
731

0.02 60
300

0.01 4
735
0 735
-
735

0.02 61
305

0.19 58
793
0 793
-
793

0.02 62
310

0.37 111
904
0 904
-
904

0.02 63
315

0.48 144
1,048
0 1,048
-
1,048

0.02 64
320

0.59 176
1,224
0 1,224
-
1,224

0.03 65
325

0.77 230
1,454
0 1,454
-
1,454

0.03 66
330

1.09 327
1,780
0 1,780
-
1,780

0.04 67
335

0.07 20
1,801
0 1,801
-
1,801

0.04 68
340

0.03 10
1,811
0 1,811
-
1,811

0.04 69
345

0.02 6
1,817
0 1,817
-
1,817

0.04 70
350

0.02 5
1,822
0 1,822
-
1,822

0.04 71
355

0.01 3
1,826
0 1,826
-
1,826

0.04 72
360

0.01 2
1,828
0 1,828
-
1,828

0.04 1867
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)

PERC TOTAL IN

OUT BASIN
(cuft) (cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
1 15

0.00 3
3 0 3
3 0.00
2 30

0.01 5
8 0 8
8 0.00
3 45

0.01 5
12 0 12
12 0.00
4 60

0.01 6
18 0 18
18 0.00
5 75

0.01 5
23 0 23
23 0.00
6 90

0.01 5
28 0 28
28 0.00
7 105

0.01 5
32 0 32
32 0.00
8 120

0.01 6
38 0 38
38 0.00
9 135

0.01 6
45 0 45
45 0.00
10 150

0.01 6
51 0 51
51 0.00
11 165

0.01 8
58 0 58
58 0.00
12 180

0.01 8
66 0 66
66 0.00
13 195

0.01 8
74 0 74
74 0.00
14 210

0.01 8
81 0 81
81 0.00
15 225

0.01 8
89 0 89
89 0.00
16 240

0.01 9
98 0 98
98 0.00
17 255

0.01 9
108
0 108
108

0.00 18
270

0.01 11
118
0 118
118

0.00 19
285

0.01 11
129
0 129
129

0.00 20
300

0.01 12
141
0 141
141

0.00 21
315

0.01 9
151
0 151
151

0.00 22
330

0.01 11
161
0 161
161

0.00 23
345

0.01 12
174
0 174
174

0.00 24
360

0.01 12
186
0 186
186

0.00 25
375

0.02 14
200
0 200
200

0.00 26
390

0.02 14
214
0 214
214

0.00 27
405

0.02 15
229
0 229
229

0.01 28
420

0.02 15
244
0 244
244

0.01 29
435

0.02 15
260
0 260
260

0.01 30
450

0.02 17
277
0 277
277

0.01 31
465

0.02 18
295
0 295
295

0.01 32
480

0.02 20
315
0 315
315

0.01 33
495

0.03 23
338
0 338
338

0.01 34
510

0.03 23
361
0 361
361

0.01 35
525

0.03 25
386
0 386
386

0.01 36
540

0.03 26
412
0 412
412

0.01 37
555

0.03 29
441
0 441
441

0.01 38
570

0.03 31
472
0 472
472

0.01 39
585

0.04 32
504
0 504
504

0.01 40
600

0.04 34
538
0 538
538

0.01 41
615

0.03 23
561
0 561
561

0.01 42
630

0.03 23
584
0 584
584

0.01 43
645

0.03 31
615
0 615
615

0.01 44
660

0.03 31
646
0 646
646

0.01 45
675

0.03 29
675
0 675
675

0.02 46
690

0.03 29
704
0 704
704

0.02 47
705

0.03 26
730
0 730
730

0.02 48
720

0.03 28
758
0 758
758

0.02 49
735

0.04 38
796
0 796
796

0.02 50
750

0.04 40
836
0 836
836

0.02 51
765

0.05 43
879
0 879
879

0.02 52
780

0.05 45
924
0 924
924

0.02 53
795

0.06 52
976
0 976
976

0.02 54
810

0.06 52
1,028
1,064
1,099
1,141
1,181
0 1,028
0 1,064
0 1,099
0 1,141
0 1,181
1,028
1,064
1,099
1,141
1,181

0.02 55
825

0.04 35

0.02 56
840

0.04 35

0.03 57
855

0.05 42

0.03 58
870

0.04 40

0.03 1868
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
59 885

0.04 40
1,221
0 1,221
-
1,221

0.03 60
900

0.04 38
1,259
0 1,259
-
1,259

0.03 61
915

0.04 37
1,296
0 1,296
-
1,296

0.03 62
930

0.04 35
1,331
0 1,331
-
1,331

0.03 63
945

0.03 29
1,361
0 1,361
-
1,361

0.03 64
960

0.03 29
1,390
0 1,390
-
1,390

0.03 65
975

0.01 6
1,396
0 1,396
-
1,396

0.03 66
990

0.01 6
1,402
0 1,402
-
1,402

0.03 67
1005

0.01 5
1,407
0 1,407
-
1,407

0.03 68
1020

0.01 5
1,411
0 1,411
-
1,411

0.03 69
1035

0.01 8
1,419
0 1,419
-
1,419

0.03 70
1050

0.01 8
1,427
0 1,427
-
1,427

0.03 71
1065

0.01 8
1,434
0 1,434
-
1,434

0.03 72
1080

0.01 6
1,440
0 1,440
-
1,440

0.03 73
1095

0.01 6
1,447
0 1,447
-
1,447

0.03 74
1110

0.01 6
1,453
0 1,453
-
1,453

0.03 75
1125

0.01 5
1,457
0 1,457
-
1,457

0.03 76
1140

0.00 3
1,460
0 1,460
-
1,460

0.03 77
1155

0.01 5
1,465
0 1,465
-
1,465

0.03 78
1170

0.01 6
1,471
0 1,471
-
1,471

0.03 79
1185

0.01 5
1,476
0 1,476
-
1,476

0.03 80
1200

0.00 3
1,479
0 1,479
-
1,479

0.03 81
1215

0.01 5
1,484
0 1,484
-
1,484

0.03 82
1230

0.01 5
1,488
0 1,488
-
1,488

0.03 83
1245

0.01 5
1,493
0 1,493
-
1,493

0.03 84
1260

0.00 3
1,496
0 1,496
-
1,496

0.03 85
1275

0.01 5
1,500
0 1,500
-
1,500

0.03 86
1290

0.00 3
1,504
0 1,504
-
1,504

0.03 87
1305

0.01 5
1,508
0 1,508
-
1,508

0.03 88
1320

0.00 3
1,511
0 1,511
-
1,511

0.03 89
1335

0.01 5
1,516
0 1,516
-
1,516

0.03 90
1350

0.00 3
1,519
0 1,519
-
1,519

0.03 91
1365

0.00 3
1,522
0 1,522
-
1,522

0.03 92
1380

0.00 3
1,525
0 1,525
-
1,525

0.04 93
1395

0.00 3
1,528
0 1,528
-
1,528

0.04 94
1410

0.00 3
1,531
0 1,531
-
1,531

0.04 95
1425

0.00 3
1,534
0 1,534
-
1,534

0.04 96
1440

0.00 3
1,537
0 1,537
-
1,537

0.04 1869
Basin Depth Analysis

A B C
D
1 RCFC&WCD SHORTCUT UNIT HYDROGRAPH METHOD
2 DATA INPUT SHEET
3 4
WORKSHEET PREPARED BY:

JAMES R. BAZUA, P.E.
5 6

PROJECT NAME
WORLD MUSEUM NORTH EXIST 10 YR EVENT
7 JOB #
C2026
8 9

CONCENTRATION POINT DESIGNATION
1 10

AREA DESIGNATION

ON -SITE
11 12

TRIBUTARY AREAS
ACRES
13 14

COMMERCIAL
15 PAVING/HARDSCAPE

1.24 16
SF - 1 ACRE
17 SF - 1/2 ACRE
18 SF-1/4ACRE
19 MF - CONDOMINIUMS
20 MF- APARTMENTS
21 MOBILE HOME PARK
22 LANDSCAPING

0.87 23

RETENTION BASIN
24 GOLF COURSE
25 MOUNTAINOUS

1.03 26

LOW LOSS RATE (PERCENT)
90%
27 28

LENGTH OF WATERCOURSE (L)
436
29 LENGTH TO POINT OPPOSITE CENTROID (Lca)
46 30
31 ELEVATION OF HEADWATER
356
32 ELEVATION OF CONCENTRATION POINT
264.5
33 34

AVERAGE MANNINGS 'N' VALUE

0.02 35
36 STORM FREQUENCY (YEAR)
100
37 38

POINT RAIN
39 3 -HOUR

1.5 40
6 -HOUR

1.93 41
24 -HOUR

2.66 42
43 BASIN CHARACTERISTICS:

ELEVATION
AREA
44 45
46 47
48 49
50 51
52 PERCOLATION RATE (in/hr)
53 54

DRYWELL DATA
55 NUMBER USED
56 PERCOLATION RATE (cfs)
1870

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVENT BASIC DATA CALCULATION FORM JOB # C2026
SHORTCUT METHOD BY =S R. BAZUA, P.E. DATE 3/28/2025

PHYSICAL DATA
[1] CONCENTRATION POINT
1 [2] AREA DESIGNATION

ON -SITE
[3] AREA - ACRES

3.140
[4] L -FEET
436
[5] L -MILES

0.083
[6] La -FEET

46.00 [7] La -MILES

0.009
[8] ELEVATION OF HEADWATER
356
(9] ELEVATION OF CONCENTRATION POINT
264.5
[10] H -FEET

91.5 [11] S-FEET/MILE
1108.1
[12] S^0.5

33.29 [13] L*LCA/S^0.5

0.000
[14] AVERAGE MANNINGS 'N'

0.02 [15] LAG TIME -HOURS

0.01 [16] LAG TIME -MINUTES

0.5 [17] 100% OF LAG -MINUTES

0.5 [18] 200% OF LAG -MINUTES

1.0 [19] UNIT TIME -MINUTES (100%-200% OF LAG)
5 [24] TOTAL PERCOLATION RATE (cfs)

0.00 RAINFALL DATA
[1] SOURCE
[2] FREQUENCY -YEARS 100
[3] DURATION:
3 -HOURS
6 -HOURS
24 -HOURS
[4]
POINT
RAIN
INCHES
(Plate E-5.2)
[5]
AREA
[6]
[7]

AVERAGE
POINT
RAIN
INCHES
[8]
POINT
RAIN
INCHES
(Plate E-5.4)
[9]
AREA
[10]
[11]

AVERAGE
POINT
RAIN
INCHES
[12]
POINT
RAIN
INCHES
(Plate E-5.6)
[13]
AREA
[14]
[15]

AVERAGE
POINT
RAIN
INCHES

1.50 3.140

1.00 1.50

1.93 3.140

1.00 1.93

2.66 3.140

1.00 2.66

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 0.00

0.00 0.00

0.00 0.00
SUM [5]
[16] AREA ADJ
[17] ADJ AVG

3.14 SUM [7]

1.50 SUM [9]

3.14 SUM [11]

1.93 SUM [13]

3.14 SUM [15]

2.66 FACTOR

POINT RAIN

1.000

1.000

1.000

1.50 1.93

2.66 STORM EVENT SUMMARY

DURATION
3 -HOUR
6 -HOUR
24 -HOUR

EFFECTIVE RAIN
(in)

0.68 0.66

0.31 FLOOD VOLUME
(cu -ft)
(acre -ft)
7,740

0.18 7,485

0.17 3,590

0.08 REQUIRED STORAGE
(cu -ft)
(acre -ft)
7,676

0.18 7,423

0.17 3,560

0.08 PEAK FLOW
(cfs)

3.71 3.15

0.34 MAXIMUM WSEL
(ft)
-
-
-
1871
Plate E-2.1

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
PROJECT WORLD MUSEUM NORTH EXIST 10 YR EVENT
CONCENTRATION POINT: 1
BY MES R. BAZUA, P.E. DATE 3/28/2025

ADJUSTED LOSS RATE
SOIL
GROUP
[Plate C-1]

LAND USE
RI
NUMBER
[Plate E-6.1]

PERVIOUS
AREA

INFILTRATION
RATE
(in/hr)
[Plate E-6.2]

DECIMAL

PERCENT

OF AREA

IMPERVIOUS
[Plate E-6.3]

ADJUSTED

INFILTRATION
RATE
(in/hr)
AREA

AVERAGE

ADJUSTED

INFILTRATION
RATE
(in/hr)
A

COMMERCIAL
32 0.74
90%

0.14 0.00

0.000

0.0000
A

PAVING/HARDSCAPE
32 0.74
100%

0.07 1.24

0.395

0.0292
A
SF - 1 ACRE
32 0.74
20%

0.61 0.00

0.000

0.0000
A
SF - 1/2 ACRE
32 0.74
40%

0.47 0.00

0.000

0.0000
A
SF - 1/4 ACRE
32 0.74
50%

0.41 0.00

0.000

0.0000
A

MF - CONDOMINIUMS
32 0.74
65%

0.31 0.00

0.000

0.0000
A

MF - APARTMENTS
32 0.74
80%

0.21 0.00

0.000

0.0000
A

MOBILE HOME PARKS
32 0.74
75%

0.24 0.00

0.000

0.0000
A

LANDSCAPING
32 0.74
0%

0.74 0.87

0.277

0.2050
A

RETENTION BASINS
32 0.74
0%

0.74 0.00

0.000

0.0000
A

GOLF COURSE
32 0.74
0%

0.74 0.00

0.000

0.0000
D

MOUNTAINOUS
93 0.95
90%

0.18 1.03

0.328

0.0592

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

VARIABLE LOSS
Fm=
C=
Ft=C(24-(T/60))^1.55

LOW LOSS RATE
Where:

T=Time in minutes.

T=1 1/2 unit time for
RATE CURVE (24
-HOUR STORM ONLY)
=
value for each unit
etc.

0.00272
SUM
(24-(T/60))^1.55 + 0.15
= 90%
T=1/2 the unit time for the first time period,

3.14 SUM

0.2935
in/hr

0.146731688

0.00272
(80-90 PERCENT)
To get an average
the second period,
time period, Use
1872
Plate E-2.1

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVENT
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.50
CONSTANT LOSS RATE-in/hr 0.29
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 1.3

0.234

0.29 0.21

0.02 0.07

22.04 2
10 0.17

1.3 0.234

0.29 0.21

0.02 0.07

22.04 3
15 0.25

1.1 0.198

0.29 0.18

0.02 0.06

18.65 4
20 0.33

1.5 0.270

0.29 0.24

0.03 0.08

25.43 5
25 0.42

1.5 0.270

0.29 0.24

0.03 0.08

25.43 6
30 0.50

1.8 0.324

0.29 0.29

0.03 0.10

28.77 7
35 0.58

1.5 0.270

0.29 0.24

0.03 0.08

25.43 8
40 0.67

1.8 0.324

0.29 0.29

0.03 0.10

28.77 9
45 0.75

1.8 0.324

0.29 0.29

0.03 0.10

28.77 10
50 0.83

1.5 0.270

0.29 0.24

0.03 0.08

25.43 11
55 0.92

1.6 0.288

0.29 0.26

0.03 0.09

27.13 12
60 1.00

1.8 0.324

0.29 0.29

0.03 0.10

28.77 13
65 1.08

2.2 0.396

0.29 0.36

0.10 0.32

96.59 14
70 1.17

2.2 0.396

0.29 0.36

0.10 0.32

96.59 15
75 1.25

2.2 0.396

0.29 0.36

0.10 0.32

96.59 16
80 1.33

2.0 0.360

0.29 0.32

0.07 0.21

62.68 17
85 1.42

2.6 0.468

0.29 0.42

0.17 0.55
164.41
18 90

1.50 2.7

0.486

0.29 0.44

0.19 0.60
181.37
19 95

1.58 2.4

0.432

0.29 0.39

0.14 0.44
130.50
20 100

1.67 2.7

0.486

0.29 0.44

0.19 0.60
181.37
21 105

1.75 3.3

0.594

0.29 0.53

0.30 0.94
283.11
22 110

1.83 3.1

0.558

0.29 0.50

0.26 0.83
249.19
23 115

1.92 2.9

0.522

0.29 0.47

0.23 0.72
215.28
24 120

2.00 3.0

0.540

0.29 0.49

0.25 0.77
232.24
25 125

2.08 3.1

0.558

0.29 0.50

0.26 0.83
249.19
26 130

2.17 4.2

0.756

0.29 0.68

0.46 1.45
435.71
27 135

2.25 5.0

0.900

0.29 0.81

0.61 1.90
571.36
28 140

2.33 3.5

0.630

0.29 0.57

0.34 1.06
317.02
29 145

2.42 6.8

1.224

0.29 1.10

0.93 2.92
876.57
30 150

2.50 7.3

1.314

0.29 1.18

1.02 3.20
961.35
31 155

2.58 8.2

1.476

0.29 1.33

1.18 3.71
1113.95
32 160

2.67 5.9

1.062

0.29 0.96

0.77 2.41
723.96
33 165

2.75 2.0

0.360

0.29 0.32

0.07 0.21

62.68 34
170

2.83 1.8

0.324

0.29 0.29

0.03 0.10

28.77 35
175

2.92 1.8

0.324

0.29 0.29

0.03 0.10

28.77 36
180

3.00 0.6

0.108

0.29 0.10

0.01 0.03

10.17 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.68 0.18
7740.06

0.18 7676.06

3.71 1873
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVEt
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.293
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 0.5

0.116

0.29 0.10

0.01 0.04

10.91 2
10 0.17

0.6 0.139

0.29 0.13

0.01 0.04

13.09 3
15 0.25

0.6 0.139

0.29 0.13

0.01 0.04

13.09 4
20 0.33

0.6 0.139

0.29 0.13

0.01 0.04

13.09 5
25 0.42

0.6 0.139

0.29 0.13

0.01 0.04

13.09 6
30 0.50

0.7 0.162

0.29 0.15

0.02 0.05

15.27 7
35 0.58

0.7 0.162

0.29 0.15

0.02 0.05

15.27 8
40 0.67

0.7 0.162

0.29 0.15

0.02 0.05

15.27 9
45 0.75

0.7 0.162

0.29 0.15

0.02 0.05

15.27 10
50 0.83

0.7 0.162

0.29 0.15

0.02 0.05

15.27 11
55 0.92

0.7 0.162

0.29 0.15

0.02 0.05

15.27 12
60 1.00

0.8 0.185

0.29 0.17

0.02 0.06

17.45 13
65 1.08

0.8 0.185

0.29 0.17

0.02 0.06

17.45 14
70 1.17

0.8 0.185

0.29 0.17

0.02 0.06

17.45 15
75 1.25

0.8 0.185

0.29 0.17

0.02 0.06

17.45 16
80 1.33

0.8 0.185

0.29 0.17

0.02 0.06

17.45 17
85 1.42

0.8 0.185

0.29 0.17

0.02 0.06

17.45 18
90 1.50

0.8 0.185

0.29 0.17

0.02 0.06

17.45 19
95 1.58

0.8 0.185

0.29 0.17

0.02 0.06

17.45 20
100

1.67 0.8

0.185

0.29 0.17

0.02 0.06

17.45 21
105

1.75 0.8

0.185

0.29 0.17

0.02 0.06

17.45 22
110

1.83 0.8

0.185

0.29 0.17

0.02 0.06

17.45 23
115

1.92 0.8

0.185

0.29 0.17

0.02 0.06

17.45 24
120

2.00 0.9

0.208

0.29 0.19

0.02 0.07

19.64 25
125

2.08 0.8

0.185

0.29 0.17

0.02 0.06

17.45 26
130

2.17 0.9

0.208

0.29 0.19

0.02 0.07

19.64 27
135

2.25 0.9

0.208

0.29 0.19

0.02 0.07

19.64 28
140

2.33 0.9

0.208

0.29 0.19

0.02 0.07

19.64 29
145

2.42 0.9

0.208

0.29 0.19

0.02 0.07

19.64 30
150

2.50 0.9

0.208

0.29 0.19

0.02 0.07

19.64 31
155

2.58 0.9

0.208

0.29 0.19

0.02 0.07

19.64 32
160

2.67 0.9

0.208

0.29 0.19

0.02 0.07

19.64 33
165

2.75 1.0

0.232

0.29 0.21

0.02 0.07

21.82 34
170

2.83 1.0

0.232

0.29 0.21

0.02 0.07

21.82 35
175

2.92 1.0

0.232

0.29 0.21

0.02 0.07

21.82 36
180

3.00 1.0

0.232

0.29 0.21

0.02 0.07

21.82 37
185

3.08 1.0

0.232

0.29 0.21

0.02 0.07

21.82 38
190

3.17 1.1

0.255

0.29 0.23

0.03 0.08

24.00 39
195

3.25 1.1

0.255

0.29 0.23

0.03 0.08

24.00 40
200

3.33 1.1

0.255

0.29 0.23

0.03 0.08

24.00 41
205

3.42 1.2

0.278

0.29 0.25

0.03 0.09

26.18 42
210

3.50 1.3

0.301

0.29 0.27

0.01 0.02

7.17 43
215

3.58 1.4

0.324

0.29 0.29

0.03 0.10

28.99 44
220

3.67 1.4

0.324

0.29 0.29

0.03 0.10

28.99 45
225

3.75 1.5

0.347

0.29 0.31

0.05 0.17

50.81 46
230

3.83 1.5

0.347

0.29 0.31

0.05 0.17

50.81 47
235

3.92 1.6

0.371

0.29 0.33

0.08 0.24

72.63 48
240

4.00 1.6

0.371

0.29 0.33

0.08 0.24

72.63 49
245

4.08 1.7

0.394

0.29 0.35

0.10 0.31

94.44 50
250

4.17 1.8

0.417

0.29 0.38

0.12 0.39
116.26
51 255

4.25 1.9

0.440

0.29 0.40

0.15 0.46
138.08
52 260

4.33 2.0

0.463

0.29 0.42

0.17 0.53
159.89
53 265

4.42 2.1

0.486

0.29 0.44

0.19 0.61
181.71
54 270

4.50 2.1

0.486

0.29 0.44

0.19 0.61
181.71
55 275

4.58 2.2

0.510

0.29 0.46

0.22 0.68
203.53
56 280

4.67 2.3

0.533

0.29 0.48

0.24 0.75
225.34
1874
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVEt
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 1029.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.293
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285

4.75 2.4

0.556

0.29 0.50

0.26 0.82
247.16
58 290

4.83 2.4

0.556

0.29 0.50

0.26 0.82
247.16
59 295

4.92 2.5

0.579

0.29 0.52

0.29 0.90
268.98
60 300

5.00 2.6

0.602

0.29 0.54

0.31 0.97
290.79
61 305

5.08 3.1

0.718

0.29 0.65

0.42 1.33
399.88
62 310

5.17 3.6

0.834

0.29 0.75

0.54 1.70
508.96
63 315

5.25 3.9

0.903

0.29 0.81

0.61 1.91
574.41
64 320

5.33 4.2

0.973

0.29 0.88

0.68 2.13
639.86
65 325

5.42 4.7

1.089

0.29 0.98

0.80 2.50
748.94
66 330

5.50 5.6

1.297

0.29 1.17

1.00 3.15
945.29
67 335

5.58 1.9

0.440

0.29 0.40

0.15 0.46
138.08
68 340

5.67 0.9

0.208

0.29 0.19

0.02 0.07

19.64 69
345

5.75 0.6

0.139

0.29 0.13

0.01 0.04

13.09 70
350

5.83 0.5

0.116

0.29 0.10

0.01 0.04

10.91 71
355

5.92 0.3

0.069

0.29 0.06

0.01 0.02

6.55 72
360

6.00 0.2

0.046

0.29 0.04

0.00 0.01

4.36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.66 0.17
7485.04

0.17 7423.15

3.15 1875
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVE
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 3086.9
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2935
MINIMUM LOSS RATE (for var. loss) - in/hr 0.147
LOW LOSS RATE - DECIMAL 0.90
C 0.00272
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15

0.25 0.2

0.021

0.518

0.019

0.002

0.01 6.01
2 30

0.50 0.3

0.032

0.512

0.029

0.003

0.01 9.02
3 45

0.75 0.3

0.032

0.506

0.029

0.003

0.01 9.02
4 60

1.00 0.4

0.043

0.500

0.038

0.004

0.01 12.03
5 75

1.25 0.3

0.032

0.494

0.029

0.003

0.01 9.02
6 90

1.50 0.3

0.032

0.489

0.029

0.003

0.01 9.02
7 105

1.75 0.3

0.032

0.483

0.029

0.003

0.01 9.02
8 120

2.00 0.4

0.043

0.477

0.038

0.004

0.01 12.03
9 135

2.25 0.4

0.043

0.471

0.038

0.004

0.01 12.03
10 150

2.50 0.4

0.043

0.465

0.038

0.004

0.01 12.03
11 165

2.75 0.5

0.053

0.460

0.048

0.005

0.02 15.03
12 180

3.00 0.5

0.053

0.454

0.048

0.005

0.02 15.03
13 195

3.25 0.5

0.053

0.448

0.048

0.005

0.02 15.03
14 210

3.50 0.5

0.053

0.443

0.048

0.005

0.02 15.03
15 225

3.75 0.5

0.053

0.437

0.048

0.005

0.02 15.03
16 240

4.00 0.6

0.064

0.432

0.057

0.006

0.02 18.04
17 255

4.25 0.6

0.064

0.426

0.057

0.006

0.02 18.04
18 270

4.50 0.7

0.074

0.421

0.067

0.007

0.02 21.05
19 285

4.75 0.7

0.074

0.415

0.067

0.007

0.02 21.05
20 300

5.00 0.8

0.085

0.410

0.077

0.009

0.03 24.05
21 315

5.25 0.6

0.064

0.405

0.057

0.006

0.02 18.04
22 330

5.50 0.7

0.074

0.400

0.067

0.007

0.02 21.05
23 345

5.75 0.8

0.085

0.394

0.077

0.009

0.03 24.05
24 360

6.00 0.8

0.085

0.389

0.077

0.009

0.03 24.05
25 375

6.25 0.9

0.096

0.384

0.086

0.010

0.03 27.06
26 390

6.50 0.9

0.096

0.379

0.086

0.010

0.03 27.06
27 405

6.75 1.0

0.106

0.374

0.096

0.011

0.03 30.07
28 420

7.00 1.0

0.106

0.369

0.096

0.011

0.03 30.07
29 435

7.25 1.0

0.106

0.364

0.096

0.011

0.03 30.07
30 450

7.50 1.1

0.117

0.359

0.105

0.012

0.04 33.08
31 465

7.75 1.2

0.128

0.354

0.115

0.013

0.04 36.08
32 480

8.00 1.3

0.138

0.349

0.124

0.014

0.04 39.09
33 495

8.25 1.5

0.160

0.344

0.144

0.016

0.05 45.10
34 510

8.50 1.5

0.160

0.339

0.144

0.016

0.05 45.10
35 525

8.75 1.6

0.170

0.335

0.153

0.017

0.05 48.11
36 540

9.00 1.7

0.181

0.330

0.163

0.018

0.06 51.12
37 555

9.25 1.9

0.202

0.325

0.182

0.020

0.06 57.13
38 570

9.50 2.0

0.213

0.321

0.192

0.021

0.07 60.14
39 585

9.75 2.1

0.223

0.316

0.201

0.022

0.07 63.14
40 600

10.00 2.2

0.234

0.311

0.211

0.023

0.07 66.15
41 615

10.25 1.5

0.160

0.307

0.144

0.016

0.05 45.10
42 630

10.50 1.5

0.160

0.302

0.144

0.016

0.05 45.10
43 645

10.75 2.0

0.213

0.298

0.192

0.021

0.07 60.14
44 660

11.00 2.0

0.213

0.294

0.192

0.021

0.07 60.14
45 675

11.25 1.9

0.202

0.289

0.182

0.020

0.06 57.13
46 690

11.50 1.9

0.202

0.285

0.182

0.020

0.06 57.13
47 705

11.75 1.7

0.181

0.281

0.163

0.018

0.06 51.12
48 720

12.00 1.8

0.192

0.277

0.172

0.019

0.06 54.12
49 735

12.25 2.5

0.266

0.273

0.239

0.027

0.08 75.17
50 750

12.50 2.6

0.277

0.268

0.249

0.008

0.03 23.04
51 765

12.75 2.8

0.298

0.264

0.268

0.033

0.11 94.58
52 780

13.00 2.9

0.309

0.260

0.278

0.048

0.15 135.91
53 795

13.25 3.4

0.362

0.257

0.326

0.105

0.33 297.38
54 810

13.50 3.4

0.362

0.253

0.326

0.109

0.34 308.37
55 825

13.75 2.3

0.245

0.249

0.220

0.024

0.08 69.16
56 840

14.00 2.3

0.245

0.245

0.220

0.024

0.08 69.16
57 855

14.25 2.7

0.287

0.241

0.259

0.046

0.14 129.99
58 870

14.50 2.6

0.277

0.238

0.249

0.039

0.12 110.33
59 885

14.75 2.6

0.277

0.234

0.249

0.043

0.13 120.60
60 900

15.00 2.5

0.266

0.230

0.239

0.036

0.11 100.64
61 915

15.25 2.4

0.255

0.227

0.230

0.028

0.09 80.54
62 930

15.50 2.3

0.245

0.223

0.220

0.021

0.07 60.28
63 945

15.75 1.9

0.202

0.220

0.182

0.020

0.06 57.13
64 960

16.00 1.9

0.202

0.217

0.182

0.020

0.06 57.13
65 975

16.25 0.4

0.043

0.213

0.038

0.004

0.01 12.03
66 990

16.50 0.4

0.043

0.210

0.038

0.004

0.01 12.03
67 1005

16.75 0.3

0.032

0.207

0.029

0.003

0.01 9.02
T
1876
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVE
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.49
UNIT TIME -PERCENT OF LAG 3086.9
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2935
MINIMUM LOSS RATE (for var. loss) - in/hr 0.147
LOW LOSS RATE - DECIMAL 0.90
C 0.00272
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020

17.00 0.3

0.032

0.204

0.029

0.003

0.01 9.02
69 1035

17.25 0.5

0.053

0.201

0.048

0.005

0.02 15.03
70 1050

17.50 0.5

0.053

0.198

0.048

0.005

0.02 15.03
71 1065

17.75 0.5

0.053

0.195

0.048

0.005

0.02 15.03
72 1080

18.00 0.4

0.043

0.192

0.038

0.004

0.01 12.03
73 1095

18.25 0.4

0.043

0.189

0.038

0.004

0.01 12.03
74 1110

18.50 0.4

0.043

0.186

0.038

0.004

0.01 12.03
75 1125

18.75 0.3

0.032

0.184

0.029

0.003

0.01 9.02
76 1140

19.00 0.2

0.021

0.181

0.019

0.002

0.01 6.01
77 1155

19.25 0.3

0.032

0.178

0.029

0.003

0.01 9.02
78 1170

19.50 0.4

0.043

0.176

0.038

0.004

0.01 12.03
79 1185

19.75 0.3

0.032

0.174

0.029

0.003

0.01 9.02
80 1200

20.00 0.2

0.021

0.171

0.019

0.002

0.01 6.01
81 1215

20.25 0.3

0.032

0.169

0.029

0.003

0.01 9.02
82 1230

20.50 0.3

0.032

0.167

0.029

0.003

0.01 9.02
83 1245

20.75 0.3

0.032

0.165

0.029

0.003

0.01 9.02
84 1260

21.00 0.2

0.021

0.163

0.019

0.002

0.01 6.01
85 1275

21.25 0.3

0.032

0.161

0.029

0.003

0.01 9.02
86 1290

21.50 0.2

0.021

0.159

0.019

0.002

0.01 6.01
87 1305

21.75 0.3

0.032

0.157

0.029

0.003

0.01 9.02
88 1320

22.00 0.2

0.021

0.155

0.019

0.002

0.01 6.01
89 1335

22.25 0.3

0.032

0.154

0.029

0.003

0.01 9.02
90 1350

22.50 0.2

0.021

0.152

0.019

0.002

0.01 6.01
91 1365

22.75 0.2

0.021

0.151

0.019

0.002

0.01 6.01
92 1380

23.00 0.2

0.021

0.150

0.019

0.002

0.01 6.01
93 1395

23.25 0.2

0.021

0.149

0.019

0.002

0.01 6.01
94 1410

23.50 0.2

0.021

0.148

0.019

0.002

0.01 6.01
95 1425

23.75 0.2

0.021

0.147

0.019

0.002

0.01 6.01
96 1440

24.00 0.2

0.021

0.147

0.019

0.002

0.01 6.01

EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cult)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cult)
PEAK FLOW (cfs)

0.31 0.08
3590.13

0.08 3560.45

0.34 T
1877
Plate E-2.2

PROJECT: WORLD MUSEUM NORTH EXIST 10 YR EVENT
JOB # C2026
1 BASIN CHARACTERISTICS

CONTOUR
DEPTH

INCR TOTAL
(ft) (ft)
AREA

INCR TOTAL
(sf) (sf)
VOLUME

INCR TOTAL
(cuft) (cuft) (acre -ft)
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 0
0 0
0 0
0 0

0.00 PERCOLATION CALCULATIONS

PERCOLATION RATE

MAXWELL IV DRYWELLS

NUMBER USED

RATE/DRYWELL

TOTAL DISSIPATED

TOTAL PERCOLATION RATE
0 in/hr
0 0 cfs

0.00 cfs
0 cfs

0.00 cfs
Basin Characteristics

1878

1 JOB # C2026
100 YEAR - 3 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
1 5

0.07 22
22 0
22 -
22 0.00
2 10

0.07 22
44 0
44 -
44 0.00
3 15

0.06 19
63 0
63 -
63 0.00
4 20

0.08 25
88 0
88 -
88 0.00
5 25

0.08 25
114
0 114
-
114

0.00 6
30 0.10
29 142
0 142
-
142

0.00 7
35 0.08
25 168
0 168
-
168

0.00 8
40 0.10
29 197
0 197
-
197

0.00 9
45 0.10
29 225
0 225
-
225

0.01 10
50 0.08
25 251
0 251
-
251

0.01 11
55 0.09
27 278
0 278
-
278

0.01 12
60 0.10
29 307
0 307
-
307

0.01 13
65 0.32
97 403
0 403
-
403

0.01 14
70 0.32
97 500
0 500
-
500

0.01 15
75 0.32
97 596
0 596
-
596

0.01 16
80 0.21
63 659
0 659
-
659

0.02 17
85 0.55
164
824
0 824
-
824

0.02 18
90 0.60
181
1,005
0 1,005
-
1,005

0.02 19
95 0.44
131
1,135
0 1,135
-
1,135

0.03 20
100

0.60 181
1,317
0 1,317
-
1,317

0.03 21
105

0.94 283
1,600
0 1,600
-
1,600

0.04 22
110

0.83 249
1,849
0 1,849
-
1,849

0.04 23
115

0.72 215
2,064
0 2,064
-
2,064

0.05 24
120

0.77 232
2,297
0 2,297
-
2,297

0.05 25
125

0.83 249
2,546
0 2,546
-
2,546

0.06 26
130

1.45 436
2,981
0 2,981
-
2,981

0.07 27
135

1.90 571
3,553
0 3,553
-
3,553

0.08 28
140

1.06 317
3,870
0 3,870
-
3,870

0.09 29
145

2.92 877
4,746
0 4,746
-
4,746

0.11 30
150

3.20 961
5,708
0 5,708
-
5,708

0.13 31
155

3.71 1,114
6,822
0 6,822
-
6,822

0.16 32
160

2.41 724
7,546
0 7,546
-
7,546

0.17 33
165

0.21 63
7,608
0 7,608
-
7,608

0.17 34
170

0.10 29
7,637
0 7,637
-
7,637

0.18 35
175

0.10 29
7,666
0 7,666
-
7,666

0.18 36
180

0.03 10
7,676
0 7,676
-
7,676

0.18 1879
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
5 0.04
2 10
3 15
4 20
5 25
6 30
7 35
VOLUME
IN
(cuft)
11 0.04 13

0.04 13

0.04 13

0.04 13

0.05 15

0.05 15
8 40
9 45
10 50
11 55

0.05 15

0.05 15

0.05 15

0.05 15
12 60

0.06 17
13 65

0.06 17
14 70

0.06 17
15 75

0.06 17
16 80

0.06 17
17 85

0.06 17
18 90

0.06 17
19 95

0.06 17
20 100 0.06 17
21 105 0.06 17
22 110 0.06 17
23 115 0.06 17
24 120 0.07 20
25 125 0.06 17
26 130 0.07 20
27 135 0.07 20
28 140 0.07 20
29 145 0.07 20
30 150 0.07 20
31 155 0.07 20
32 160 0.07 20
33 165 0.07 22
34 170 0.07 22
35 175 0.07 22
36 180 0.07 22
37 185 0.07 22
38 190 0.08 24
39 195 0.08 24
40 200
41 205

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
11 24
37 50
63 79
94 0
0 0
0 0
0 0
11 24
37 50
63 79
94 109
0 109
124
0 124
140
0 140
155
0 155
172
0 172
190
0 190
207
0 207
225
0 225
242
0 242
260
0 260
277
0 277
295
0 295
312
0 312
329
0 329
347
0 347
364
0 364
384
0 384
401
0 401
421
0 421
441
0 441
460
0 460
480
0 480
500
0 500
519
0 519
539
0 539
561
0 561
583
0 583
604
0 604
626
0 626
648
0 648
672
0 672
696
0 696

BALANCE IN
BASIN
(cuft) (acre -ft)
11 24
37 50
63 79
94 109
124
140
155
172
190
207
225
242
260
277
295
312
329
347
364
384
401
421
441
460
480
500
519
539
561
583
604
626
648
672
696

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 0.00

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.01

0.01 0.02

0.02 0.08 24 720 0 720 - 720 0.02

0.09 26 746 0 746 - 746 0.02
7 753 0 753 - 753 0.02

0.10 29 782 0 782 - 782 0.02
42 210 0.02
43 215
44 220 0.10 29
45 225 0.17 51
46 230 0.17 51
47 235 0.24 73
48 240 0.24 73
49 245 0.31 94
50 250 0.39 116
51 255 0.46 138
52 260 0.53 160
53 265 0.61 182
54 270 0.61 182
55 275 0.68 204
811
0 811
862
0 862
913
0 913
986
0 986
1,058
1,153
1,269
1,407
1,567
1,749
1,930
2,134
0 1,058
0 1,153
0 1,269
0 1,407
0 1,567
0 1,749
0 1,930
0 2,134
811
862
913
986
1,058
1,153
1,269
1,407
1,567
1,749
1,930
2,134

0.02 0.02

0.02 0.02

0.02 0.03

0.03 0.03

0.04 0.04

0.04 0.05
1880
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
56 280

0.75 225
2,359
0 2,359
-
2,359

0.05 57
285

0.82 247
2,606
0 2,606
-
2,606

0.06 58
290

0.82 247
2,853
0 2,853
-
2,853

0.07 59
295

0.90 269
3,122
0 3,122
-
3,122

0.07 60
300

0.97 291
3,413
0 3,413
-
3,413

0.08 61
305

1.33 400
3,813
0 3,813
-
3,813

0.09 62
310

1.70 509
4,322
0 4,322
-
4,322

0.10 63
315

1.91 574
4,896
0 4,896
-
4,896

0.11 64
320

2.13 640
5,536
0 5,536
-
5,536

0.13 65
325

2.50 749
6,285
0 6,285
-
6,285

0.14 66
330

3.15 945
7,231
0 7,231
-
7,231

0.17 67
335

0.46 138
7,369
0 7,369
-
7,369

0.17 68
340

0.07 20
7,388
0 7,388
-
7,388

0.17 69
345

0.04 13
7,401
0 7,401
-
7,401

0.17 70
350

0.04 11
7,412
0 7,412
-
7,412

0.17 71
355

0.02 7
7,419
0 7,419
-
7,419

0.17 72
360

0.01 4
7,423
0 7,423
-
7,423

0.17 1881
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)

PERC TOTAL IN

OUT BASIN
(cuft) (cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
1 15

0.01 6
6 0 6
6 0.00
2 30

0.01 9
15 0 15
15 0.00
3 45

0.01 9
24 0 24
24 0.00
4 60

0.01 12
36 0 36
36 0.00
5 75

0.01 9
45 0 45
45 0.00
6 90

0.01 9
54 0 54
54 0.00
7 105

0.01 9
63 0 63
63 0.00
8 120

0.01 12
75 0 75
75 0.00
9 135

0.01 12
87 0 87
87 0.00
10 150

0.01 12
99 0 99
99 0.00
11 165

0.02 15
114
0 114
114 0.00
12 180

0.02 15
129
0 129
129 0.00
13 195

0.02 15
144
0 144
144 0.00
14 210

0.02 15
159
0 159
159 0.00
15 225

0.02 15
174
0 174
174 0.00
16 240

0.02 18
192
0 192
192 0.00
17 255

0.02 18
210
0 210
210 0.00
18 270

0.02 21
232
0 232
232 0.01
19 285

0.02 21
253
0 253
253 0.01
20 300

0.03 24
277
0 277
277 0.01
21 315

0.02 18
295
0 295
295 0.01
22 330

0.02 21
316
0 316
316 0.01
23 345

0.03 24
340
0 340
340 0.01
24 360

0.03 24
364
0 364
364 0.01
25 375

0.03 27
391
0 391
391 0.01
26 390

0.03 27
418
0 418
418 0.01
27 405

0.03 30
448
0 448
448 0.01
28 420

0.03 30
478
0 478
478 0.01
29 435

0.03 30
508
0 508
508 0.01
30 450

0.04 33
541
0 541
541 0.01
31 465

0.04 36
577
0 577
577 0.01
32 480

0.04 39
616
0 616
616 0.01
33 495

0.05 45
662
0 662
662 0.02
34 510

0.05 45
707
0 707
707 0.02
35 525

0.05 48
755
0 755
755 0.02
36 540

0.06 51
806
0 806
806 0.02
37 555

0.06 57
863
0 863
863 0.02
38 570

0.07 60
923
0 923
923 0.02
39 585

0.07 63
986
0 986
986 0.02
40 600

0.07 66
1,052
1,098
1,143
1,203
1,263
1,320
1,377
1,428
1,482
1,558
1,581
1,675
1,811
2,108
2,417
2,486
2,555
2,685
2,795
0 1,052
0 1,098
0 1,143
0 1,203
0 1,263
0 1,320
0 1,377
0 1,428
0 1,482
0 1,558
0 1,581
0 1,675
0 1,811
0 2,108
0 2,417
0 2,486
0 2,555
0 2,685
0 2,795
1,052 0.02
1,098 0.03
1,143 0.03
1,203 0.03
1,263 0.03
1,320 0.03
1,377 0.03
1,428 0.03
1,482 0.03
1,558 0.04
1,581 0.04
1,675 0.04
1,811 0.04
2,108 0.05
2,417 0.06
2,486 0.06
2,555 0.06
2,685 0.06
2,795 0.06
41 615

0.05 45
42 630

0.05 45
43 645

0.07 60
44 660

0.07 60
45 675

0.06 57
46 690

0.06 57
47 705

0.06 51
48 720

0.06 54
49 735

0.08 75
50 750

0.03 23
51 765

0.11 95
52 780

0.15 136
53 795

0.33 297
54 810

0.34 308
55 825

0.08 69
56 840

0.08 69
57 855

0.14 130
58 870

0.12 110
1882
Basin Depth Analysis

1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)

TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)

TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)

BALANCE IN
BASIN
(cuft) (acre -ft)
59 885

0.13 121
2,916
0 2,916
-
2,916

0.07 60
900

0.11 101
3,017
0 3,017
-
3,017

0.07 61
915

0.09 81
3,097
0 3,097
-
3,097

0.07 62
930

0.07 60
3,158
0 3,158
-
3,158

0.07 63
945

0.06 57
3,215
0 3,215
-
3,215

0.07 64
960

0.06 57
3,272
0 3,272
-
3,272

0.08 65
975

0.01 12
3,284
0 3,284
-
3,284

0.08 66
990

0.01 12
3,296
0 3,296
-
3,296

0.08 67
1005

0.01 9
3,305
0 3,305
-
3,305

0.08 68
1020

0.01 9
3,314
0 3,314
-
3,314

0.08 69
1035

0.02 15
3,329
0 3,329
-
3,329

0.08 70
1050

0.02 15
3,344
0 3,344
-
3,344

0.08 71
1065

0.02 15
3,359
0 3,359
-
3,359

0.08 72
1080

0.01 12
3,371
0 3,371
-
3,371

0.08 73
1095

0.01 12
3,383
0 3,383
-
3,383

0.08 74
1110

0.01 12
3,395
0 3,395
-
3,395

0.08 75
1125

0.01 9
3,404
0 3,404
-
3,404

0.08 76
1140

0.01 6
3,410
0 3,410
-
3,410

0.08 77
1155

0.01 9
3,419
0 3,419
-
3,419

0.08 78
1170

0.01 12
3,431
0 3,431
-
3,431

0.08 79
1185

0.01 9
3,440
0 3,440
-
3,440

0.08 80
1200

0.01 6
3,446
0 3,446
-
3,446

0.08 81
1215

0.01 9
3,455
0 3,455
-
3,455

0.08 82
1230

0.01 9
3,464
0 3,464
-
3,464

0.08 83
1245

0.01 9
3,473
0 3,473
-
3,473

0.08 84
1260

0.01 6
3,479
0 3,479
-
3,479

0.08 85
1275

0.01 9
3,488
0 3,488
-
3,488

0.08 86
1290

0.01 6
3,494
0 3,494
-
3,494

0.08 87
1305

0.01 9
3,503
0 3,503
-
3,503

0.08 88
1320

0.01 6
3,509
0 3,509
-
3,509

0.08 89
1335

0.01 9
3,518
0 3,518
-
3,518

0.08 90
1350

0.01 6
3,524
0 3,524
-
3,524

0.08 91
1365

0.01 6
3,530
0 3,530
-
3,530

0.08 92
1380

0.01 6
3,536
0 3,536
-
3,536

0.08 93
1395

0.01 6
3,542
0 3,542
-
3,542

0.08 94
1410

0.01 6
3,548
0 3,548
-
3,548

0.08 95
1425

0.01 6
3,554
0 3,554
-
3,554

0.08 96
1440

0.01 6
3,560
0 3,560
-
3,560

0.08 1883
Basin Depth Analysis

A B C
D
1 RCFC&WCD SHORTCUT UNIT HYDROGRAPH METHOD
2 DATA INPUT SHEET
3 4
WORKSHEET PREPARED BY:

JAMES R. BAZUA, P.E.
5 6

PROJECT NAME
WORLD MUSEUM PROP 2 YR EVENT - NORTH
7 JOB #
C2026
8 9

CONCENTRATION POINT DESIGNATION
1 10

AREA DESIGNATION

ON -SITE
11 12

TRIBUTARY AREAS
ACRES
13 14

COMMERCIAL
15 PAVING/HARDSCAPE

1.67 16
SF - 1 ACRE
17 SF - 1/2 ACRE
18 SF-1/4ACRE
19 MF - CONDOMINIUMS
20 MF- APARTMENTS
21 MOBILE HOME PARK
22 LANDSCAPING

0.55 23

RETENTION BASIN
24 GOLF COURSE
25 MOUNTAINOUS

0.92 26

LOW LOSS RATE (PERCENT)
90%
27 28

LENGTH OF WATERCOURSE (L)
480
29 LENGTH TO POINT OPPOSITE CENTROID (Lca)
75 30
31 ELEVATION OF HEADWATER
356
32 ELEVATION OF CONCENTRATION POINT
264.5
33 34

AVERAGE MANNINGS 'N' VALUE

0.02 35
36 STORM FREQUENCY (YEAR)
100
37 38

POINT RAIN
39 3 -HOUR

0.721
40 6 -HOUR

0.953
41 24 -HOUR

1.36 42
43 BASIN CHARACTERISTICS:

ELEVATION
AREA
44 45
46 47
48 49
50 51
52 PERCOLATION RATE (in/hr)
53 54

DRYWELL DATA
55 NUMBER USED
56 PERCOLATION RATE (cfs)
1884

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NORTH BASIC DATA CALCULATION FORM JOB # C2026
SHORTCUT METHOD BY =S R. BAZUA, P.E. DATE 3/28/2025

PHYSICAL DATA
[1] CONCENTRATION POINT
1 [2] AREA DESIGNATION

ON -SITE
[3] AREA - ACRES

3.140
[4] L -FEET
480
[5] L -MILES

0.091
[6] La -FEET

75.00 [7] La -MILES

0.014
[8] ELEVATION OF HEADWATER
356
[9] ELEVATION OF CONCENTRATION POINT
264.5
[10] H -FEET

91.5 [11] S-FEET/MILE
1006.5
[12] S^0.5

31.73 [13] L*LCA/S^0.5

0.000
[14] AVERAGE MANNINGS 'N'

0.02 [15] LAG TIME -HOURS

0.01 [16] LAG TIME -MINUTES

0.6 [17] 100% OF LAG -MINUTES

0.6 [18] 200% OF LAG -MINUTES

1.2 [19] UNIT TIME -MINUTES (100%-200% OF LAG)
5 [24] TOTAL PERCOLATION RATE (cfs)

0.00 RAINFALL DATA
[1] SOURCE
[2] FREQUENCY -YEARS 100
[3] DURATION:
3 -HOURS
6 -HOURS
24 -HOURS
[4]
POINT
RAIN
INCHES
(Plate E-5.2)
[5]
AREA
[6]
[7]

AVERAGE
POINT
RAIN
INCHES
[8]
POINT
RAIN
INCHES
(Plate E-5.4)
[9]
AREA
[10]
[11]

AVERAGE
POINT
RAIN
INCHES
[12]
POINT
RAIN
INCHES
(Plate E-5.6)
[13]
AREA
[14]
[15]

AVERAGE
POINT
RAIN
INCHES

0.72 3.140

1.00 0.72

0.95 3.140

1.00 0.95

1.36 3.140

1.00 1.36

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 0.00

0.00 0.00

0.00 0.00
SUM [5]
[16] AREA ADJ
[17] ADJ AVG

3.14 SUM [7]

0.72 SUM [9]

3.14 SUM [11]

0.95 SUM [13]

3.14 SUM [15]

1.36 FACTOR

POINT RAIN

1.000

1.000

1.000

0.72 0.95

1.36 STORM EVENT SUMMARY

DURATION
3 -HOUR
6 -HOUR
24 -HOUR

EFFECTIVE RAIN
(in)

0.21 0.21

0.14 FLOOD VOLUME
(cu -ft)
(acre -ft)
2,417

0.06 2,393

0.05 1,550

0.04 REQUIRED STORAGE
(cu -ft)
(acre -ft)
2,397

0.06 2,373

0.05 1,537

0.04 PEAK FLOW
(cfs)

1.53 1.31

0.06 MAXIMUM WSEL
(ft)
-
-
-
1885
Plate E-2.1

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
PROJECT WORLD MUSEUM PROP 2 YR EVENT - NORTH
CONCENTRATION POINT: 1
BY MES R. BAZUA, P.E. DATE 3/28/2025

ADJUSTED LOSS RATE
SOIL
GROUP
[Plate C-1]

LAND USE
RI
NUMBER
[Plate E-6.1]

PERVIOUS
AREA

INFILTRATION
RATE
(in/hr)
[Plate E-6.2]

DECIMAL

PERCENT

OF AREA

IMPERVIOUS
[Plate E-6.3]

ADJUSTED

INFILTRATION
RATE
(in/hr)
AREA

AVERAGE

ADJUSTED

INFILTRATION
RATE
(in/hr)
A

COMMERCIAL
32 0.74
90%

0.14 0.00

0.000

0.0000
A

PAVING/HARDSCAPE
32 0.74
100%

0.07 1.67

0.532

0.0394
A
SF - 1 ACRE
32 0.74
20%

0.61 0.00

0.000

0.0000
A
SF - 1/2 ACRE
32 0.74
40%

0.47 0.00

0.000

0.0000
A
SF - 1/4 ACRE
32 0.74
50%

0.41 0.00

0.000

0.0000
A

MF - CONDOMINIUMS
32 0.74
65%

0.31 0.00

0.000

0.0000
A

MF - APARTMENTS
32 0.74
80%

0.21 0.00

0.000

0.0000
A

MOBILE HOME PARKS
32 0.74
75%

0.24 0.00

0.000

0.0000
A

LANDSCAPING
32 0.74
0%

0.74 0.55

0.175

0.1296
A

RETENTION BASINS
32 0.74
0%

0.74 0.00

0.000

0.0000
A

GOLF COURSE
32 0.74
0%

0.74 0.00

0.000

0.0000
D

MOUNTAINOUS
93 0.95
90%

0.18 0.92

0.293

0.0529

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

0.00 0.000

0.0000

VARIABLE LOSS
Fm=
C=
Ft=C(24-(T/60))^1.55

LOW LOSS RATE
Where:

T=Time in minutes.

T=1 1/2 unit time for
RATE CURVE (24
-HOUR STORM ONLY)
=
value for each unit
etc.

0.00205
SUM
(24-(T/60))^1.55 + 0.11
= 90%
T=1/2 the unit time for the first time period,

3.14 SUM

0.2219
in/hr

0.110929936

0.00205
(80-90 PERCENT)
To get an average
the second period,
time period, Use
1886
Plate E-2.1

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NORTH
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.62
UNIT TIME -PERCENT OF LAG 808.9
TOTAL ADJUSTED STORM RAIN -INCHES 0.72
CONSTANT LOSS RATE-in/hr 0.22
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 1.3

0.112

0.22 0.10

0.01 0.04

10.60 2
10 0.17

1.3 0.112

0.22 0.10

0.01 0.04

10.60 3
15 0.25

1.1 0.095

0.22 0.09

0.01 0.03

8.97 4
20 0.33

1.5 0.130

0.22 0.12

0.01 0.04

12.23 5
25 0.42

1.5 0.130

0.22 0.12

0.01 0.04

12.23 6
30 0.50

1.8 0.156

0.22 0.14

0.02 0.05

14.67 7
35 0.58

1.5 0.130

0.22 0.12

0.01 0.04

12.23 8
40 0.67

1.8 0.156

0.22 0.14

0.02 0.05

14.67 9
45 0.75

1.8 0.156

0.22 0.14

0.02 0.05

14.67 10
50 0.83

1.5 0.130

0.22 0.12

0.01 0.04

12.23 11
55 0.92

1.6 0.138

0.22 0.12

0.01 0.04

13.04 12
60 1.00

1.8 0.156

0.22 0.14

0.02 0.05

14.67 13
65 1.08

2.2 0.190

0.22 0.17

0.02 0.06

17.93 14
70 1.17

2.2 0.190

0.22 0.17

0.02 0.06

17.93 15
75 1.25

2.2 0.190

0.22 0.17

0.02 0.06

17.93 16
80 1.33

2.0 0.173

0.22 0.16

0.02 0.05

16.30 17
85 1.42

2.6 0.225

0.22 0.20

0.00 0.01

2.91 18
90 1.50

2.7 0.234

0.22 0.21

0.01 0.04

11.06 19
95 1.58

2.4 0.208

0.22 0.19

0.02 0.07

19.56 20
100

1.67 2.7

0.234

0.22 0.21

0.01 0.04

11.06 21
105

1.75 3.3

0.286

0.22 0.26

0.06 0.20

59.96 22
110

1.83 3.1

0.268

0.22 0.24

0.05 0.15

43.66 23
115

1.92 2.9

0.251

0.22 0.23

0.03 0.09

27.36 24
120

2.00 3.0

0.260

0.22 0.23

0.04 0.12

35.51 25
125

2.08 3.1

0.268

0.22 0.24

0.05 0.15

43.66 26
130

2.17 4.2

0.363

0.22 0.33

0.14 0.44
133.32
27 135

2.25 5.0

0.433

0.22 0.39

0.21 0.66
198.52
28 140

2.33 3.5

0.303

0.22 0.27

0.08 0.25

76.26 29
145

2.42 6.8

0.588

0.22 0.53

0.37 1.15
345.22
30 150

2.50 7.3

0.632

0.22 0.57

0.41 1.29
385.97
31 155

2.58 8.2

0.709

0.22 0.64

0.49 1.53
459.32
32 160

2.67 5.9

0.510

0.22 0.46

0.29 0.91
271.87
33 165

2.75 2.0

0.173

0.22 0.16

0.02 0.05

16.30 34
170

2.83 1.8

0.156

0.22 0.14

0.02 0.05

14.67 35
175

2.92 1.8

0.156

0.22 0.14

0.02 0.05

14.67 36
180

3.00 0.6

0.052

0.22 0.05

0.01 0.02

4.89 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.21 0.06
2416.63

0.06 2396.65

1.53 1887
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NOR -
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.62
UNIT TIME -PERCENT OF LAG 808.9
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.222
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5

0.08 0.5

0.057

0.22 0.05

0.01 0.02

5.39 2
10 0.17

0.6 0.069

0.22 0.06

0.01 0.02

6.46 3
15 0.25

0.6 0.069

0.22 0.06

0.01 0.02

6.46 4
20 0.33

0.6 0.069

0.22 0.06

0.01 0.02

6.46 5
25 0.42

0.6 0.069

0.22 0.06

0.01 0.02

6.46 6
30 0.50

0.7 0.080

0.22 0.07

0.01 0.03

7.54 7
35 0.58

0.7 0.080

0.22 0.07

0.01 0.03

7.54 8
40 0.67

0.7 0.080

0.22 0.07

0.01 0.03

7.54 9
45 0.75

0.7 0.080

0.22 0.07

0.01 0.03

7.54 10
50 0.83

0.7 0.080

0.22 0.07

0.01 0.03

7.54 11
55 0.92

0.7 0.080

0.22 0.07

0.01 0.03

7.54 12
60 1.00

0.8 0.091

0.22 0.08

0.01 0.03

8.62 13
65 1.08

0.8 0.091

0.22 0.08

0.01 0.03

8.62 14
70 1.17

0.8 0.091

0.22 0.08

0.01 0.03

8.62 15
75 1.25

0.8 0.091

0.22 0.08

0.01 0.03

8.62 16
80 1.33

0.8 0.091

0.22 0.08

0.01 0.03

8.62 17
85 1.42

0.8 0.091

0.22 0.08

0.01 0.03

8.62 18
90 1.50

0.8 0.091

0.22 0.08

0.01 0.03

8.62 19
95 1.58

0.8 0.091

0.22 0.08

0.01 0.03

8.62 20
100

1.67 0.8

0.091

0.22 0.08

0.01 0.03

8.62 21
105

1.75 0.8

0.091

0.22 0.08

0.01 0.03

8.62 22
110

1.83 0.8

0.091

0.22 0.08

0.01 0.03

8.62 23
115

1.92 0.8

0.091

0.22 0.08

0.01 0.03

8.62 24
120

2.00 0.9

0.103

0.22 0.09

0.01 0.03

9.70 25
125

2.08 0.8

0.091

0.22 0.08

0.01 0.03

8.62 26
130

2.17 0.9

0.103

0.22 0.09

0.01 0.03

9.70 27
135

2.25 0.9

0.103

0.22 0.09

0.01 0.03

9.70 28
140

2.33 0.9

0.103

0.22 0.09

0.01 0.03

9.70 29
145

2.42 0.9

0.103

0.22 0.09

0.01 0.03

9.70 30
150

2.50 0.9

0.103

0.22 0.09

0.01 0.03

9.70 31
155

2.58 0.9

0.103

0.22 0.09

0.01 0.03

9.70 32
160

2.67 0.9

0.103

0.22 0.09

0.01 0.03

9.70 33
165

2.75 1.0

0.114

0.22 0.10

0.01 0.04

10.77 34
170

2.83 1.0

0.114

0.22 0.10

0.01 0.04

10.77 35
175

2.92 1.0

0.114

0.22 0.10

0.01 0.04

10.77 36
180

3.00 1.0

0.114

0.22 0.10

0.01 0.04

10.77 37
185

3.08 1.0

0.114

0.22 0.10

0.01 0.04

10.77 38
190

3.17 1.1

0.126

0.22 0.11

0.01 0.04

11.85 39
195

3.25 1.1

0.126

0.22 0.11

0.01 0.04

11.85 40
200

3.33 1.1

0.126

0.22 0.11

0.01 0.04

11.85 41
205

3.42 1.2

0.137

0.22 0.12

0.01 0.04

12.93 42
210

3.50 1.3

0.149

0.22 0.13

0.01 0.05

14.00 43
215

3.58 1.4

0.160

0.22 0.14

0.02 0.05

15.08 44
220

3.67 1.4

0.160

0.22 0.14

0.02 0.05

15.08 45
225

3.75 1.5

0.172

0.22 0.15

0.02 0.05

16.16 46
230

3.83 1.5

0.172

0.22 0.15

0.02 0.05

16.16 47
235

3.92 1.6

0.183

0.22 0.16

0.02 0.06

17.24 48
240

4.00 1.6

0.183

0.22 0.16

0.02 0.06

17.24 49
245

4.08 1.7

0.194

0.22 0.17

0.02 0.06

18.31 50
250

4.17 1.8

0.206

0.22 0.19

0.02 0.06

19.39 51
255

4.25 1.9

0.217

0.22 0.20

0.02 0.07

20.47 52
260

4.33 2.0

0.229

0.22 0.21

0.01 0.02

6.46 53
265

4.42 2.1

0.240

0.22 0.22

0.02 0.06

17.23 54
270

4.50 2.1

0.240

0.22 0.22

0.02 0.06

17.23 55
275

4.58 2.2

0.252

0.22 0.23

0.03 0.09

28.01 56
280

4.67 2.3

0.263

0.22 0.24

0.04 0.13

38.78 1888
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NOR -
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.14
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.62
UNIT TIME -PERCENT OF LAG 808.9
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.222
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285

4.75 2.4

0.274

0.22 0.25

0.05 0.17

49.55 58
290

4.83 2.4

0.274

0.22 0.25

0.05 0.17

49.55 59
295

4.92 2.5

0.286

0.22 0.26

0.06 0.20

60.33 60
300

5.00 2.6

0.297

0.22 0.27

0.08 0.24

71.10 61
305

5.08 3.1

0.355

0.22 0.32

0.13 0.42
124.96
62 310

5.17 3.6

0.412

0.22 0.37

0.19 0.60
178.83
63 315

5.25 3.9

0.446

0.22 0.40

0.22 0.70
211.14
64 320

5.33 4.2

0.480

0.22 0.43

0.26 0.81
243.46
65 325

5.42 4.7

0.537

0.22 0.48

0.32 0.99
297.33
66 330

5.50 5.6

0.640

0.22 0.58

0.42 1.31
394.28
67 335

5.58 1.9

0.217

0.22 0.20

0.02 0.07

20.47 68
340

5.67 0.9

0.103

0.22 0.09

0.01 0.03

9.70 69
345

5.75 0.6

0.069

0.22 0.06

0.01 0.02

6.46 70
350

5.83 0.5

0.057

0.22 0.05

0.01 0.02

5.39 71
355

5.92 0.3

0.034

0.22 0.03

0.00 0.01

3.23 72
360

6.00 0.2

0.023

0.22 0.02

0.00 0.01

2.15 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)

0.21 0.05
2392.99

0.05 2373.21

1.31 1889
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NOR"
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.62
UNIT TIME -PERCENT OF LAG 2426.8
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2219
MINIMUM LOSS RATE (for var. loss) - in/hr 0.111
LOW LOSS RATE - DECIMAL 0.90
C 0.00205
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15

0.25 0.2

0.011

0.392

0.010

0.001

0.00 3.07
2 30

0.50 0.3

0.016

0.387

0.015

0.002

0.01 4.61
3 45

0.75 0.3

0.016

0.383

0.015

0.002

0.01 4.61
4 60

1.00 0.4

0.022

0.378

0.020

0.002

0.01 6.15
5 75

1.25 0.3

0.016

0.374

0.015

0.002

0.01 4.61
6 90

1.50 0.3

0.016

0.369

0.015

0.002

0.01 4.61
7 105

1.75 0.3

0.016

0.365

0.015

0.002

0.01 4.61
8 120

2.00 0.4

0.022

0.361

0.020

0.002

0.01 6.15
9 135

2.25 0.4

0.022

0.356

0.020

0.002

0.01 6.15
10 150

2.50 0.4

0.022

0.352

0.020

0.002

0.01 6.15
11 165

2.75 0.5

0.027

0.348

0.024

0.003

0.01 7.69
12 180

3.00 0.5

0.027

0.343

0.024

0.003

0.01 7.69
13 195

3.25 0.5

0.027

0.339

0.024

0.003

0.01 7.69
14 210

3.50 0.5

0.027

0.335

0.024

0.003

0.01 7.69
15 225

3.75 0.5

0.027

0.331

0.024

0.003

0.01 7.69
16 240

4.00 0.6

0.033

0.326

0.029

0.003

0.01 9.22
17 255

4.25 0.6

0.033

0.322

0.029

0.003

0.01 9.22
18 270

4.50 0.7

0.038

0.318

0.034

0.004

0.01 10.76
19 285

4.75 0.7

0.038

0.314

0.034

0.004

0.01 10.76
20 300

5.00 0.8

0.044

0.310

0.039

0.004

0.01 12.30
21 315

5.25 0.6

0.033

0.306

0.029

0.003

0.01 9.22
22 330

5.50 0.7

0.038

0.302

0.034

0.004

0.01 10.76
23 345

5.75 0.8

0.044

0.298

0.039

0.004

0.01 12.30
24 360

6.00 0.8

0.044

0.294

0.039

0.004

0.01 12.30
25 375

6.25 0.9

0.049

0.290

0.044

0.005

0.02 13.84
26 390

6.50 0.9

0.049

0.286

0.044

0.005

0.02 13.84
27 405

6.75 1.0

0.054

0.283

0.049

0.005

0.02 15.37
28 420

7.00 1.0

0.054

0.279

0.049

0.005

0.02 15.37
29 435

7.25 1.0

0.054

0.275

0.049

0.005

0.02 15.37
30 450

7.50 1.1

0.060

0.271

0.054

0.006

0.02 16.91
31 465

7.75 1.2

0.065

0.267

0.059

0.007

0.02 18.45
32 480

8.00 1.3

0.071

0.264

0.064

0.007

0.02 19.99
33 495

8.25 1.5

0.082

0.260

0.073

0.008

0.03 23.06
34 510

8.50 1.5

0.082

0.257

0.073

0.008

0.03 23.06
35 525

8.75 1.6

0.087

0.253

0.078

0.009

0.03 24.60
36 540

9.00 1.7

0.092

0.249

0.083

0.009

0.03 26.13
37 555

9.25 1.9

0.103

0.246

0.093

0.010

0.03 29.21
38 570

9.50 2.0

0.109

0.242

0.098

0.011

0.03 30.75
39 585

9.75 2.1

0.114

0.239

0.103

0.011

0.04 32.28
40 600

10.00 2.2

0.120

0.235

0.108

0.012

0.04 33.82
41 615

10.25 1.5

0.082

0.232

0.073

0.008

0.03 23.06
42 630

10.50 1.5

0.082

0.229

0.073

0.008

0.03 23.06
43 645

10.75 2.0

0.109

0.225

0.098

0.011

0.03 30.75
44 660

11.00 2.0

0.109

0.222

0.098

0.011

0.03 30.75
45 675

11.25 1.9

0.103

0.219

0.093

0.010

0.03 29.21
46 690

11.50 1.9

0.103

0.216

0.093

0.010

0.03 29.21
47 705

11.75 1.7

0.092

0.212

0.083

0.009

0.03 26.13
48 720

12.00 1.8

0.098

0.209

0.088

0.010

0.03 27.67
49 735

12.25 2.5

0.136

0.206

0.122

0.014

0.04 38.43
50 750

12.50 2.6

0.141

0.203

0.127

0.014

0.04 39.97
51 765

12.75 2.8

0.152

0.200

0.137

0.015

0.05 43.05
52 780

13.00 2.9

0.158

0.197

0.142

0.016

0.05 44.58
53 795

13.25 3.4

0.185

0.194

0.166

0.018

0.06 52.27
54 810

13.50 3.4

0.185

0.191

0.166

0.018

0.06 52.27
55 825

13.75 2.3

0.125

0.188

0.113

0.013

0.04 35.36
56 840

14.00 2.3

0.125

0.185

0.113

0.013

0.04 35.36
57 855

14.25 2.7

0.147

0.182

0.132

0.015

0.05 41.51
58 870

14.50 2.6

0.141

0.180

0.127

0.014

0.04 39.97
59 885

14.75 2.6

0.141

0.177

0.127

0.014

0.04 39.97
60 900

15.00 2.5

0.136

0.174

0.122

0.014

0.04 38.43
61 915

15.25 2.4

0.131

0.172

0.118

0.013

0.04 36.90
62 930

15.50 2.3

0.125

0.169

0.113

0.013

0.04 35.36
63 945

15.75 1.9

0.103

0.166

0.093

0.010

0.03 29.21
64 960

16.00 1.9

0.103

0.164

0.093

0.010

0.03 29.21
65 975

16.25 0.4

0.022

0.161

0.020

0.002

0.01 6.15
66 990

16.50 0.4

0.022

0.159

0.020

0.002

0.01 6.15
67 1005

16.75 0.3

0.016

0.156

0.015

0.002

0.01 4.61
H
1890
Plate E-2.2

RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM PROP 2 YR EVENT - NOR
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025

EFFECTIVE

RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 3.140
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.62
UNIT TIME -PERCENT OF LAG 2426.8
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.2219
MINIMUM LOSS RATE (for var. loss) - in/hr 0.111
LOW LOSS RATE - DECIMAL 0.90
C 0.00205
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020

17.00 0.3

0.016

0.154

0.015

0.002

0.01 4.61
69 1035