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FLOOD01787
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Last modified
11/23/2009 12:58:08 PM
Creation date
10/4/2006 10:21:40 PM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Stream Name
South Boulder Creek
Title
South Boulder Creek/ Flatirons
Date
12/5/1997
Prepared For
Boulder
Prepared By
Consultants
Floodplain - Doc Type
Community File
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<br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Bear Canyon Creek can spill to the Anderson Basin (and Ditch) at Table Mesa and <br />Broadway (Highway 93) <br /> <br />Downstream of Highway 36 on the west side of the basin there are three subbasins <br />which are drained by storm sewers to Bear Canyon Creek, but which may <br />contribute to the South Boulder Creek basin because of street drainage patterns and <br />the Wellman Ditch. The Wellman Ditch can also bring in significant runoff from <br />other watersheds, particularly Bear Canyon Creek. <br /> <br />KEY FEATURES AFFECTING LOCAL DRAINAGE AND SOUTH BOULDER CREEK <br />OVERFLOWS - HIGHWAY 36 TO THE WELLMAN DITCH <br /> <br />Flow arriving at the area of Highway 36 Bridge over the main channel of South <br />Boulder Creek can potentially spill to the northwest, as documented during Phase I. <br />There are three major and several minor routes which the flow can take before <br />joining South Boulder Creek: <br /> <br />1 . Main Channel. The main channel route conveys flow in a largely <br />riparian cottonwood grove floodplain which has a mixture of open <br />space, agriculture, residential, and commercial uses. Significant spills <br />to the West Valley can occur upstream of Highways 93 and 36. As <br />the main channel passes by the Wellman Ditch additional spills to the <br />West Valley occur through a residential area and the golf course. <br />Below Arapahoe, a water diversion to the Valmont reservoirs (Hillcrest, <br />Valmont, Leggett) can also carry flood flows, as indicated in previous <br />floodplain studies. Also, there is another potential spill to the west to <br />Dry Creek Ditch No.2 near the railroad tracks. <br /> <br />2. Direct return to South Boulder Creek: Drv Creek No.2. Viele. and the <br />Anderson Ditch. The South Boulder Creek spillage upstream of <br />Highway 36 that flows to the northwest would be joined by flows <br />from Dry Creek Ditch No.2. <br /> <br />There are three modest conveyance systems which will carry an initial <br />portion of the flow across Highway 36 and, for the most part, back to <br />South Boulder Creek just below South Boulder Road. The first 220 cfs <br />would be conveyed in the Dry Creek No.2 box culvert across Highway <br />36, and via an irrigation ditch to a spill structure near South Boulder <br />Road which would shed most of the flow to the lower Anderson Ditch, <br />which subsequently could spill to Viele. Greater spillage flow from <br />South Boulder Creek, on the order of 500 to 800 cfs, will be <br />intercepted by the Viele drainage system adjacent to the Foothills <br />Parkway Interchange and conveyed under Highway 36, and then <br />combine with the spillage from the lower Anderson Ditch and the Dry <br /> <br />II - 3 <br />
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