Area 3400 km 2 land use agriculture residential

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• area: 3400 km 2 • land use: agriculture, residential, industrial • water use: mainly agricultural • Pajaro Valley overdrafts GW by ~60% Pajaro River Basin
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Many kinds of "enhanced" recharge
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Human Appendix to the Natural Water System (Instream use much greater than offstream use or consumption, 30:4:1)
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Reservoirs: store water, flood control (but: silting, changes to aquatic life, expensive, evaporation)
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Reservoirs are not forever - Carmel River dam removal
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Trends in Water Use
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Consequences of Groundwater Withdrawal Pumping ground water will lower the water table and form a cone of depression around the well –This may impact local and regional ground water availability Aquifer rocks may re-adjust after ground water is withdrawn Sediments may compaction and cause surface subsidence An area of low elevation, relative to sea level, may be inundated by the sea Sinkholes may also develop depending on the host rock Near coastlines saltwater intrusion may occur Freshwater is less dense than saltwater Saltwater near a coast line may push freshwater lenses back if recharge is not sufficient to force seawater toward the sea
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Groundwater Overuse (Slow Recharge = Easy to Overdraft, Dangers: Lower Base Flow in Streams and Coastal Saltwater Intrusion)
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Environmental Consequence of Overdraft Overdraft can lead to: • seawater intrusion • loss of stream or wetland flow • damage to riperian habitat • subsidence • permanent loss of storage • reductions to water quality
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Water Quality Measures for expressing Water Quality – Parts per million (ppm) Parts per billion (ppb) Total Dissolved Solids (TDS) •The sum of dissolved solid chemicals in the water
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