SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING
SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING ISSUES Concept Discussions Internal Review Draft June 12, 2018 1 GOALS AND OBJECTIVES Habitat for key species Multi-species fish habitat Food source for birds Water supply pond for future habitat and dust mitigation projects 2 PRELIMINARY Whitewater River/Coachella Valley Stormwater Channel (CVSWC) 3 CONCEPTUAL LAYOUT PRELIMINARY CROSS-SECTION 4
NORTH LAKE PLANNING KEY ISSUES Water quality Salinity Inflow sources & quantities Storm flow routing Gravity vs pumping Pond elevation 5 WATER QUALITY DATA: SELENIUM Inflows (5 yr avg) Whitewater River (CVSWC): 1.8 ppb Other Drains: 3-8 ppb New USEPA draft criteria (2016) for Se 1.5 ppb in ponded water 3.1 ppb in flowing waters Previous (1987) chronic criterion: 5 ppb New criteria recognize fish tissue data supersede water column values (8.5 mg/kg, whole body) 6 Note: ppb = parts per billion WATER QUALITY DATA: OTHER PARAMETERS Nutrient levels typical of highly eutrophic waters Nitrogen: ~15 ppm, Phosphorus: ~2 ppm
Nitrogen limited, i.e., there is excess phosphorus Total suspended solids moderately high: ~100 ppm 7 Note: ppm = parts per million WATER QUALITY DECISIONS Are selenium levels acceptable for creating habitat? Treatment options: Sediment basins Treatment wetlands Mixing in ponds Inflow options Whitewater River vs Drains 8 SALINITY Salinity in the Whitewater River Typically <1 ppt (parts per thousand) In other drains Typically 1-4 ppt 9 SALINITY OPTIONS
Possible targets Nearly fresh: No pumping of Salton Sea water, vs 15-20 ppt: Pumping Salton Sea water Capital, O&M, energy costs, or Greater than 20 ppt: More pumping More costs 10 Coachella Valley Flows (6-yr avg) All other drains = 34 TAFY Whitewater R (CVSWC) = 40 TAFY Inflow needed ~12 TAFY Local drains = 11 TAFY 11Note: TAFY = Thousand Acre-Feet/Year INFLOW SOURCES & QUANTITIES Whitewater River only Limits pond sizes Whitewater flows are seasonal Whitewater plus drains Increases pond sizes but lowers water quality Include groundwater? Shallow or deep 12
STORM FLOW ROUTING OPTIONS Flow through ponds Requires means to pass through floods Examples: inflatable dam or large spillway needed Diversion around ponds Requires diversion system or pumping plant Breaks interconnectivity of ponds east and west of the Whitewater mouth 13 GRAVITY VS PUMPING Gravity feed Avoid pumping costs Complicated plumbing Pumping Added cost, but may be only practical inflow method 14 POND ELEVATION OPTIONS Within historic Salton Sea footprint (-228 NGVD 1928) Easier connectivity with other planned
improvements Above Salton Sea footprint 15 Project Area (Slide 3) LAND OWNERSHIP 16 FOLLOWUP Comments, questions & information welcome Email to: [email protected] 17 CVWD Coachella Valley Stormwater Channel and Agricultural Drain Flow (AFY) Drain BACKUP McKinley Cleveland 0.5
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