1 Drought Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
July 5, 2022
July 5, 2022 Reservoir Storage
Reservoir
Current
Storage1,2,3
Maximum
Storage4
Available
Capacity
Percent of
Maximum
Storage
Normal
Percent of
Maximum
Storage5
(AF) (AF) (AF)
Tuolumne System
Hetch Hetchy 353,300 360,360 7,060 98.0% 99.1%
Cherry 262,400 273,345 10,945 96.0% -
Eleanor 26,290 27,100 810 97.0% -
Water Bank 228,583 570,000 341,417 40.1% 97.0%
Total Tuolumne Storage 870,573 1,230,805 360,232 70.7% - Local System
Calaveras 60,974 96,670 35,696 63.1% -
San Antonio 47,095 53,266 6,171 88.4% -
Crystal Springs 50,776 58,309 7,533 87.1% -
San Andreas 14,243 19,027 4,784 74.9% -
Pilarcitos 2,708 3,030 322 89.4% -
Total Local Storage 175,796 230,302 54,506 76.3% -
Total System Storage 1,046,369 1,461,107 414,738 71.6% 91.2% Total without water bank 817,786 891,107 73,321 91.8% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
July 4, 2022
Avg Annual Total: 36.68 inches
YTD Total: 23.62 inches
Bay Area 7-station Precipitation Index
as of July 4, 2022
Avg Annual Total: 22.80 inches
YTD Total: 23.49 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries
Upper Tuolumne River Ecosystem Program
Spring 2022
Expected Poopenaut Valley Pond Fill
Poopenaut
Pond
• The “pond fill” release
inundates the pond, but
also numerous other
wetland areas as well.
• Flooding Poopenaut Pond
improves habitat in critical
area.
• Timed to maximize impact
and coincide with DSOD
inspection
• All areas in orange, green,
and blue are inundated at
4,100 cfs.
Planned Hydrograph
Actual Hydrograph
Spill over
Drumgates
Peak Release
Hetch Hetchy Reservoir Fill
Peak Release
Spill over
Drumgates
Poopenaut Valley
18 Poopenaut
Pond
Poopenaut Pond Flooding
The release to fill
Poopenaut Pond
inundates other wetlands
in the Valley as well, such
as this wetland on the
south side of the river.