Water Supply

• Ice and snow 
• Precipitation
• Snow melt and runoff
• Infiltration
• Ground water Flow percolation
• Ground water storage
• Oceans 
• Evaporation
• Condensation
• Atmosphere
• Evapotransportation
• Surface runoff
• Stream flow
• Springs
• Freshwater

• L.A. Aqueduct
• State water Project
• Colorado river Aqueduct

97

2 or 68 percent of all fresh water

• 1%
• 30% is accessable

The SWP was developed by the Department of Water Resources.

A system of water canals,storage and dams in the central valley that store and transfer water to California's San Joaquin valley

United states bureau of reclamation

Provide water to the central/ San Joaquin valley and hydroelectric power generation.

Drought and regulatory measures preventing expansion of the systems.

Water recycling is the recycling of rain,storm,grey or effluent water.  The water is   collected from these sources and treated for public use

Indirect use is recycled water that has been treated but instead of going directly into the distribution system it is pumped back into a reservoir or ground water system first.

Direct reuse refers to water that is recycled and treated then put directly back into the distribution system.

The Delta is an inverted Delta in northern California supplied by the , Sacramento and San Joaquin rovers.  Formed as a marsh after the last ice age it has been transformed by  the construction of levees and islands for  agricultural use.

One problem is the risk of damage from an earthquake that could destroy many Levees forcing saltwater into the delta.  Another problem is the ecological damage done by the removal of water from the delta this can cause harm to wildlife and water supply.

The Sacramento and San Joaquin rivers

One problem is the ecological damage on the Delta.  By routing water through the tunnels instead of drawing it through the delta, the water in the delta would more easily stabilize and take pressure off the wildlife.  Another is cost the water would be of higher quality because it would not have to flow through the delta thus requiring less treatment.