Hetch Hetchy Water and Power

Reservoir and Powerhouse Planned Releases

Period of May 7-18

 

Reservoir Releases*

Reservoir

Elevation (ft)

Storage (TAF)

Planned Releases (cfs)

Special Conditions

Hetch Hetchy

3775.9

302.9

1000-4100

Increased valve releases at Hetchy due to increased inflows. Plan is to maintain 3200 cfs through May 11> On May 11 we will have a 4 hour pulse at 4100 cfs, then ramp down to ~1000 cfs over next week. Releases may change as inflows change. Timing of 4100 cfs pulse may change.

Cherry

4662.0

204.4

5

None

Eleanor

4657.2

23.5

100 – 300

Valve releases 100-300 cfs expected to continue while inflows are high.

 

Powerhouse Releases**

Powerhouse

Planned Tuolumne Releases (cfs)

Special Conditions

Kirkwood

500

Spill at KPH

Holm

950

 

Moccasin***

100-300

Spill at Moccasin Reservoir

 

 

* Reservoir releases are dependent on storage and weather conditions, and can be changed at any time.

** Powerhouse releases can vary significantly dependent on power load and operational constraints. Planned releases are estimates.

*** Moccasin releases seen at Moccasin Creek between town of Moccasin and Don Pedro Reservoir. These releases do not affect Tuolumne River conditions, but do impact recreation in Moccasin Creek.