# Shared Flashcard Set

## Details

Watershed characteristics
Lecture 2
12
Environmental Studies
01/24/2017

Term
 watershed outlet
Definition
 the point which defines the watershed, the location where the watershed all flows to.
Term
 nested watersheds
Definition
 smaller sub-watersheds are found within larger networks of watersheds
Term
 sub-watershed
Definition
 Subdivisions of a large watershed to create land unitswith comparable characteristics.This simplifies computer modelingand allows us to identify flowcharacteristics at multiple pointswithin a watershed.
Term
 On a topographic map water flows are shown:
Definition
 as perpendicular to contour lines
Term
 On a topographic map in steeper areas contour lines are depicted:
Definition
 closer together
Term
 On a topographic map in flatter areas contour lines are depicted:
Definition
 further apart
Term
 On a topographic map a ridge top or mountain top is depicted by:
Definition
 closed contour line
Term
 On a topographic map a valley bottom is depicted by:
Definition
 "v" shape pointing uphill in the contour lines
Term
 On a topographic map a ridge is depicted by:
Definition
 "v" shape pointing downhill
Term
 Why is the drainage area so important?
Definition
 It reflects the volume of water that is generated during rainfall. It is common in hydrologic design to assume a constant depth of rainfall throughout the watershed. Under this assumption the volume of rainwater available for runoff would be the product of the rainfall depth and drainage area.
Term
 What are the three linear measurements used for channel length?
Definition
 L-The distance measured along the main channel from the watershed outlet to the basin divide.Lc - The distance from watershed outlet to the end of the channel as indicated on the map.L10-85 - Distance between two points located at 10 and 85% of the distance from the outlet.
Term
 centroid
Definition
 Location of the point within the drainage basin that represents the weighted center of the basin.
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