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Potter Valley ProjectHEC-ResSim Model

John MendozaChris DelaneyDon Seymour

August 29, 2018

Potter Valley Project ResSim

• 7 Model Junctions1. Lake Pillsbury2. Scott Dam3. Van Arsdale Reservoir4. Cape Horn Dam5. Downstream of Cape Horn Dam6. Potter Valley Powerhouse7. East Fork of Russian River

• 3 Potential Added Locations8. Below Tomki Creek9. Below Outlet Creek10. Below Middle Fork Eel

Potter Valley Project ResSim• Hydrology

Ø Western HydrologicsØ 108-years:

§ 1910 – 2017

• Lake Pillsbury StorageØ 2016 PG&E Bathymetric Survey

• Current PVP OperationsØ 2004 RPAØ Block Water

§ Based on 2017§ After May 1 release blockwater if

flows below CHD < 250 cfs

Ø Discretionary diversions§ Storage > Target Storage Curve§ Simulates current operational

practices

Ø Gate closure§ Gate closure model logic based on

inflow into Lake Pillsbury

Potter Valley Project ResSim

Potter Valley Project ResSim

Model Validation Results

Model Validation Results

Modeled calculated gate closure start date: March 16

Observed gate closure start date: March 24

Model Validation Results

Model Validation Results

Model Validation Results

Summary Metrics Template• Daily Average & Probability Exceedance of

Flow & Storage Time Series

Summary Metrics TemplateExisting S1 S2 S3 S4 S5

Unimpair

ed

Historical

Gage S1 S2 S3 S4 S5 Unimpaired

Historical

Gage

Storage % % % % % % %

Lake Pillsbury % % % % % % %

Average % % % % % % %

EOS % % % % % % %

Min/Max (Std Dev) % % % % % % %

Lake Mendocino % % % % % % %

Average % % % % % % %

EOS % % % % % % %

Min/Max (Std Dev) % % % % % % %

Flows % % % % % % %

Eel River % % % % % % %

Below Scott Dam % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

Above Cape Horn Dam % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

Below Tomki Creek % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

Below Middle Fork Eel % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

East Fork Russian River % % % % % % %

PV Powerhouse % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

Above Lake Mendocino % % % % % % %

Jun-Sep Avg % % % % % % %

Jun-Sep Min/Max (Std Dev) % % % % % % %

Water Year Avg % % % % % % %

Water Year Min/Max (Std Dev) % % % % % % %

Evaluation

Metric (AF) Model Junction/Value

Model Scenario Other Percent Change From Existing Condition Scenario

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