Surface Water (Lakes, streams, ponds, wetlands, etc.)

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Presentation transcript:

Surface Water (Lakes, streams, ponds, wetlands, etc.)

 The total area from which a stream draws its water.  The boundaries of the drainage area are called drainage divides  The total area from which a stream draws its water.  The boundaries of the drainage area are called drainage divides Drainage Basin (Watershed)

Major North American Drainage Basins & Divides

Discharge: 17,500 m 3 /sec

Colorado River Drainage Basin Continental Divide

Bottom Line: Know your watershed - everything that is in the watershed can end up in the stream. The precipitation, evaporation, and % runoff of the basin will determine how much water is available.

Groundwater GW Recharge Area (Infiltration) GW Discharge GW Flow

Porosity = The percent void space in a rock or sediment Permeability = The ability of a material to transmit a fluid

Unsaturated Zone: Pores include both air and water Saturated Zone: Pores filled with water Groundwater Table Groundwater Recharge

Aquifer = A geologic unit capable of storing and transmitting water in sufficient quantities to supply wells Generally not an “underground cave” = A geologic unit capable of storing and transmitting water in sufficient quantities to supply wells Generally not an “underground cave”

Groundwater Flow & Discharge

U.S. Groundwater Withdrawals:

Groundwater Impacts 1.Groundwater depletion 2.Land subsidence 3.Saltwater intrusion

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