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Watershed Modeling at SFEI

John J. Oram, Lester J. McKee, Mikolaj LewickiSPLWG December 2007

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Objectives

• Improve understanding of monitored watersheds

• Determine sediment and contaminant loads from unmonitored watersheds

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Other Studies

• Bay Area Hydrologic Model (BAHM)– SCVURPPP, ACCWP, SMCWPPP– Model Used: HSPF– Purpose: Stormwater management

• Brake Pad Partnership (BPP)– Gov., Manufacturers, Enviros, stormwater

mngers– Model Used: HSPF– Purpose: Impact of brake pad Cu on South

San Francisco Bay

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Other Studies (continued)

• BAHM and BPP are where we want to be:– multi-watershed models– Water, sediment, contaminant loads

• However, we want to walk … not run.– Develop single watershed models where we

monitor sediments and contaminants– Incrementally add watersheds as we gain

knowledge

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Project #1 : Guadalupe River

• $75k funding for 2008

• Objectives:– Develop HSPF model for

1) Water

2) Sediment

3) Hg and PCBs

– Estimate current loads– Determine proportional flow regime– Estimate long-term avg loads

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Project #1 : Guadalupe River

• Potential Challenges– Reservoirs– Plumbing (e.g., storm drains)– Stream x-sections– Others …

• Would like to leverage SCCWRP– Learn Drew Ackerman’s HSPF secrets– Why use SWMM for BMPs?