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Last modified
1/26/2010 10:25:17 AM
Creation date
1/5/2009 12:18:10 PM
Metadata
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Template:
Floodplain Documents
County
El Paso
Community
Manitou Springs, Colorado Springs
Basin
Arkansas
Title
Paleohydrologic Flood Investigations for Streams in Manitou Springs and Colorado Springs
Date
12/3/1987
Floodplain - Doc Type
Floodplain Report/Masterplan
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Fountain Creek at the upsteam ~:~rporate limit (undisturbed by <br />Highway 24), at an elevation of 6,400 feet, has a channel width of 10 <br />feet. Pea-size gravel deposi.ts, tree scaring, and grass covered <br />banks, indicate recent flows have not exceeded 3 feet. Therefore <br />recent strzamflow of 300 cubic f.eet per second is indicated. <br />At an elevation of 6,700 feet, on the~right bank o~ Fountain <br />Creek, is a 5-foot deep and 30-foot long gravel flood bar that was <br />~eposited in the last 100 year•s. Thz flood bar contains boulders of <br />up to 2 feet in diameter. Because of the highway is is unknown how <br />wide the channel was during the deposition of the flood bar. <br />The recent channel hae the same dimensions as at the previous <br />location. <br />waldo Canyon ~oins Fountain Creek at an ?levation~ of 6,760 feet <br />and has an approximate drairiage area of 2 square miles. A private <br />road is located in the canyori (~wners were not at home and upstream <br />i"4i'vestigations on private property were not made). However, channel <br />dimen~ions by Highway 24 are: w;dth is 5 2eet and the depth is 2 feet. <br />The peak discharge for recent F1oWS would be about 100 cubic feet per <br />~econd. • <br />French Creek ~oins Fount~in Creek at an elevation of 7,220 feet <br />and has a drainage area estimated to be about 5 square miles. There <br />are no significant fl~od depo:~its in the channel. The chan.nel width <br />is 4 feet and the banks are gra5s and moss covered to about 2 feet <br />above the streambed. There is no flood debris above this ~e~th. This <br />would indicate that recent peak discharges have not excee~ed 100 to <br />'?00 cubic teet per second. This- lack o* flood evidence indicates that <br />flow~ have not exceeded the erosion threshold discharge of 200 to 300 <br />cubic feet per second for 1t~0 years or more. Jus± downst.ream from <br />French Creek, Fountain Creek channel dimznsione are 10 feet wide and 2 <br />feet deep. The peak discharge of recent flows is estimated to be 200 <br />cubic zeet ~ei second. <br />C~s~ade Creek ~oins Fountain Creek at Cascade at an eltvation of <br />7,360 feet and has an estimated drainage area of 9 square miles. <br />There are no rlood deposits :in the channel. The channel width is 4 <br />fzzt and moss and lichen completely cover channel bould~rs to the <br />water surface about 1 foot above the streambed. This channe]. suggests <br />that recent peak discharges are less than 40 cubic feet per second. <br />This lack of flood evidence indicates that flows have not exceeded the <br />erosion threshold discharge of 200 to 300 cubic feet per ssecond for <br />100 years or more. <br />The unnamed left bank tributary to Fountain Cr~ek at Cascade at <br />an elevation of '7,360 feet has an estimated ~rainage area oi 1 square <br />mile. The channel is a 3-foot wide swale and is complet:ely grass <br />filled showing no evidence of flood deposits.• This channel suggests <br />recent streamflow has been less than 30 cubic feet per secc~nd. This <br />lack of flood evidence indicates that flows have not exaeeded the <br />eiosion threshold discharge of 200 to 300 cubic feet per ~econd for <br />100 years or more. <br />The channel dimensions of Fountain Creek at Cascade are: width is <br />8 feet and depth is 2 feet. There are no significant flood deposits <br />and the banks are well vegetated with grass, brush, and moss. The <br />~O <br />
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