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<br />
<br />II GENERAL BASIN DESCRIPTION
<br />
<br />The Dry Gulch watershed lies in the westerly portion of the Denver
<br />
<br />Metropolitan region, predominantly in the City of Lakewood, with
<br />
<br />the remainder in the City of Denver. Its general location is
<br />
<br />illustrated in Figure II-l. The basin consists of gradually
<br />
<br />sloping, relatively level land with few dominant hills or ridges.
<br />
<br />The basin is drained by two principal channels -- Dry Gulch
<br />
<br />and North Dry Gulch. These gulches are still visible in their
<br />
<br />natural states in selected locations, but the urbanization of
<br />
<br />the region has forced the channels out of their natural equilib-
<br />
<br />rium. There have been two major causes of this imbalance of
<br />
<br />the equilibrium state. The first cause is the change in land
<br />
<br />surface from natural, vegetated soil to impervious ground covers
<br />
<br />of streets, parking lots, and buildings. Because of this change,
<br />
<br />a greater portion of the rainfall in the watershed is conveyed
<br />
<br />to the channels, and a lesser portion is able to infiltrate into
<br />
<br />the ground. The second cause of the imbalance is the constric-
<br />
<br />tion or obliteration of the channels themselves. The channels
<br />
<br />have been frequently replaced by small culverts which prevent
<br />
<br />the natural conveyance of large flows, change the sediment carry-
<br />
<br />ing characteristics, and promote erosion or deposition of soil
<br />
<br />at unnatural locations.
<br />
<br />.JL
<br />,r
<br />
<br />As a result, the Dry Gulch and North Dry Gulch Channels have
<br />
<br />been removed from their natural service and cast in the roles
<br />
<br />FIGURE n-I
<br />GENERAL LOCATION MAP
<br />DRY GULCH AND TRIBUTARIES
<br />
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