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FLOOD08848
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Last modified
1/26/2010 10:06:41 AM
Creation date
10/5/2006 3:55:31 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
37
County
Jefferson
Community
Lakewood
Stream Name
Sanderson Gulch, North Sanderson Gulch, Weir Gulch
Basin
South Platte
Title
Major Drainageway Planning - Volume I - Sanderson Gulch and Weir Gulch
Date
8/1/1972
Designation Date
12/1/1974
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />" <br />I <br /> <br />l<lid around the periphery of th.. {J<.md. Water to the pond is <br />supplied frorn a well located adjacent to the pond. During any <br />5i~eable storm occurrence, runoff water from Sanderson Gulch <br />flows directly into the pond from one of the outlet conduits <br />beneath the Green Gables Entrance Road. Once the Green Gables <br />Entrance Road is overtopped, the entire overflowwQuld be directed <br />into the Shwayder Pond. <br /> <br />The Shwayder Pond is totally inadequate to route any major storm <br />runoff. The spillway is extremely small and the entire embank- <br />ment would he overtopped by any but the smallest storms. The pond, <br />however, is essentially cut out of the natural soil and very little <br />danger of failure and resulting release of large volumes of run- <br />off is evident. <br /> <br />I <br />I <br /> <br />C!airfield Reservoir is located approximately one-half mile below <br />Shwayder Pond on Sanderson Gulch. The reservoir is in private <br />ownership and serves as an aesthetic additive to the area. <br />Access to several homes located north of Sanderson Gulch is <br />achieved by use of a road along the embankment of Clairfield <br />Reservoir. Tho spillway for the reservoir is actually a bridge <br />16 feet wide by 4 feet Z inches high. A two foot diameter vertical <br />corrugated metal pipe serves as the outlet structure beneath the <br />darn embankment. The normal water surface area of the lake is <br />approximately 2.8 acres. <br /> <br />Hydrological investigations indicate that the existing dam crest <br />would be overtopped by a ten year storm runoff. The existing <br />facilities must therefore be considered as totally unsafe for <br />existence within an urban area. <br /> <br />The mainBit-.O-Sea Reservoir is located irrunediately downstream <br />from Clair field Reservoir. This reservoir is owned by a private <br />corporation of 18 home owners and acts as the aesthetic core <br />facility to the development. The reservoir has a surface area <br />of approximately 4.7 acres. The spillway consists of a 40 foot <br />long broad crested weir with a concrete cutoff wall. Hydrological <br />investigations indicate that the dam crest would be overtopped <br />by a 25 year storm occurrence. Since overtopping of the embank- <br />ment might result in breaching of thc dike and release of the <br />stored waters behind it,the reservoir must be considered unsafe <br />for existence in a developed area. <br /> <br />Immediately below the main Bit- O-.<;ea R",,,,,,rvoir i.s '" smaller <br />reservoir in the same development complex. The storage volume <br />of this reservoir is so small that it has not been considered in <br />the runoff analysis. <br /> <br />-15_ <br /> <br />NORTH SANDERSON GULCH <br /> <br />The upper 136 acres of North Sanderson Gulch has historically been <br />intercepted by Robbins Dasher Lake. Robbins Dasher Lake was an <br />irrigation storage reservoir. Approximately 10 years ago its use <br />as an irrigation reservoir ceased and it began to be filled in for <br />development and park purposes. Green Gahles Park, belonging to <br />the Foothills Metropolitan Recreation and Park District, now occu- <br />pies part of the northeast quadrant of the reservoir. Plans are <br />now underway for the straightening of Garrison Street directly <br />through the middle of the reservoir site. The reservoir has effec- <br />tively ceased to exist due to recent development. <br />A small recreational pond has been situated in the park develop- <br />ment which has potential as a flood detention reservoir. Under <br />existing conditions of topography, however, very little storm <br />water can enter the reservoir. <br /> <br />Immediately east of the reservoir, Main Agricultural DitCh crosses <br />the North Sanderson basin. The ditch is faced with its normal <br />problem of intercepting surface runoffs. since there is no estab- <br />lished channel for North Sanderson Gulch at this location, it is <br />impossible for the ditch to discharge accumulated surface runoff <br />waters into a natural drainage course. General flooding of the <br />area would be possible during a major storm from the ditch. <br />Near the intersection of Wadsworth Blvd. and Florida Avenue is the <br />site of an old irrigation storage reservoir on the sub-basin of <br />North Sanderson Gulch which enters from the Alameda High School area. <br />This reservoir has historically accepted runoff from approxim~tely <br />112 acres. <br /> <br />The reservoir no longer functions in the capacity as an irrigation <br />storage facility. The be~ has be~n br~ached and develor~~nt is <br />radpily encroaching upon the area. The pond originally had a <br />surface area of approximately 2.75 acres. <br />About one-quarter mile above the junction of North Sanderson GulCh <br />with main Sanderson Gulch is another small privately owned reservoir <br />adjacent to the KLIR Radio Station. The pond is d7signed merely for <br />aesthetic purposes having a surface area of approx~mately 2.35 acres_ <br />The spillway consists of a V shaped grass section with a 90 foot top <br />width. Analysis of the reservoir indicates that the embankment <br />wo~ld be overtopped by ~~e 10 yc~r ~tor~ ccc~rrcncc. ~~c rc~crvcir <br />is of Iluch small volume that very little damage would occur should <br />it be br",ach",d. <br /> <br />-17- <br />
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