Issue 4b - Addressing Local Degradation -

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Presentation transcript:

Issue 4b - Addressing Local Degradation - Compliance location at Contra Costa Canal at Pumping Plant #1 - Addressing Local Degradation - David A. Briggs Special Projects Manager Contra Costa Water District

Contra Costa Water District Service Area

Diversions from Rock Slough are critical to CCWD Up to 450 cfs 350 cfs CCWD uses Rock Slough Intake to meet customer demands when Old River Intake is filling Los Vaqueros Reservoir and/or during peak demand periods. Rock Slough diversions will increase over time as CCWD demand increases. 250 cfs 200 cfs

Two local conditions affect compliance at PP1 1. Diversion rate at PP1 affects local circulation: In July 1997, CCWD began using the Old River intake which reduced diversions from Rock Slough. However, Rock Slough use will increase as CCWD demand increases because diversions from the Old River Pump Station are already maximized. 2. Local degradation increases salinity under some conditions: Monitoring and field investigations in Rock Slough and Contra Costa Canal confirmed Veale Tract drainage and seepage near PP1 are the two major local sources CALFED projects will address sources by 2007.

Rock Slough and Contra Costa Canal Holland Tract EC Contra Costa Canal Sandmound Slough Tide Gate Pumping Plant #1 [C5 CHCCC06] Delta Road Bridge Trash Rack / Fish Screen (Entrance to Canal) Bacon Island EC

CCWD operations: Prior to 1997 All CCWD supplies diverted at Rock Slough, except for small diversions (about 5 TAF/yr) at Mallard Slough

CCWD operations: 1997 to present Old River Pump Station and Los Vaqueros Reservoir now used to meet demands, in addition to Rock Slough

Future CCWD Operations: 2020 forecast

Higher pumping reduces local salinity differences Seepage near PP1 Veale Tract drainage

CALFED Projects provide sustainable solutions Canal Improvement Project Protects CCWD’s water supply from groundwater seepage (project will be operational in June 2007) Veale Tract Project Re-locates existing Veale Tract drainage to area with higher flow and more favorable mean current (project will be operational in June 2005)

Conclusions Approach suggested by CCWD and DWR is sustainable: No re-directed impacts, no change in protection of beneficial uses; Reduces conflicts; Reliance on alternative location will likely decrease in future because: CALFED projects will be on-line in 1-3 years, reducing the two major sources of degradation in Rock Slough and Contra Costa Canal; CCWD’s demand and use of Rock Slough will increase in future. Increased circulation in Rock Slough will reduce need to use alternative compliance location.