Why are watershed protection programs needed in Virginia? Check all that apply. Ecosystems need to be controlled. Floods can carry pollution and destroy habitats. Dams can be damaged and may require repair. Humans can be reckless during recreational activities. Wildlife can ruin water sources when building habitats.
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Ch 7 - Rivers and Flooding
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watershed
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area of land where all of the water that is under it or drains off of it goes into the same place. all the land that contributes water to a trunk river. individual streams in the watershed carry water and sediment. also called drainage basins and catchments.
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surface runoff
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surface runoff from precipitation onto the land flows together toward lower areas such as lakes or oceans.
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Terms in this set (109)
watershed
area of land where all of the water that is under it or drains off of it goes into the same place. all the land that contributes water to a trunk river. individual streams in the watershed carry water and sediment. also called drainage basins and catchments.
surface runoff
surface runoff from precipitation onto the land flows together toward lower areas such as lakes or oceans.
drainage divide
individual watersheds are separated from one another by a drainage divide- the highest topographic divide in the area.
tributaries
streams that flow into other streams. they contribute to another river. tributaries merge into the main trunk river.
water supply
river water supply is determined by area and precipitation
overland flow/runoff
the water that flows over the land surface to feed rivers.
groundwater
some of the precipitation that falls will infiltrate the ground and supply water to groundwater. some of the runoff stored in ponds or dammed lakes will also infiltrate the ground.
removal of vegetation
removal of vegetation from an area, such as clear cutting forests or crop harvesting, can increase surface runoff.
urbanization
urbanization that covers the ground with buildings and pavement decreases infiltration and increases surface runoff.
discharge
the amount of water flowing through a river at any given time. discharge is a rate- the volume of water flowing past a specific point in the river each second. discharge = area x velocity.
factors of discharge
the discharge of a river depends mainly on two factors: the size of its watershed, and the amount of precipitation.
high discharge