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<br />ABSTRACT
<br />
<br />This report presents the conceptual and preliminary design for the
<br />
<br />flood control improvement alternatives selected to mitigate flooding pro-
<br />
<br />blems on Lee Gulch and Little Creek.
<br />
<br />A detailed cost estimate of the improvements is presented in the
<br />
<br />report. The total capital cost of the improvements is estimated to be
<br />
<br />$512,000 for Lee Gulch and $4,220,000 for Little Creek. The following
<br />
<br />alternatives were selected after evaluation of the Phase A report:
<br />
<br />LEE GULCH
<br />
<br />Flood plain zoning of the lOa-year flood plain
<br />Flood insurance
<br />- Construction of a maintenance access trail
<br />- Select channel improvements and erosion protection
<br />- Side channel spillway on Highline Canal to seperate irrigation and
<br />drainage flows
<br />
<br />,
<br />
<br />LITTLE CREEK
<br />
<br />Flood plain zoning of the lOa-year flood plain
<br />Flood insurance
<br />- Open channel through downtown Littleton
<br />- Relocation of the City Ditch
<br />- Open channel and improved crossings from Lake Street to Apache Street
<br />to convey the 5-year flood
<br />- Detention facility at Little's Creek Park
<br />- Improved crossings at Broadway and Santa Fe to convey the lOa-year flood
<br />- Flow seperation structure at the Highline Canal
<br />- Relief drain upstream of the Highline Canal to protect up to the
<br />5-year flow
<br />- Select improvements on existing detention facility at Clarkson
<br />and Geddes
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<br />JURISDICTIONAL RESPONSIBILITY
<br />
<br />DRAINAGE ARAPII\HJE 1'5000'
<br />BASIN Pll\RAMETER L1TTLEDN COUNTY TOTAL , ,
<br /> 5000 0 5000 FIG.I
<br /> AREA (Sq. Mi,) 1.73 0.69 2.42 MAJOR DRAIHAGEWAY
<br />LEE GULCH PLANNING
<br />LENGTH (Mil 2.82 1.16 3.98
<br /> LEE GULCH- LITTLE CREEK
<br />LI TT LE AREA(Sq MiJ 1. 54 1. 19 2.73
<br />CREEK 4,91 URBAN DRAINAGE AND tLOOO CONTROL OIS7'RICT
<br />LENGTH (Mil 2.71 2.20
<br /> CITY OF LITTLETON ARAPAHO[ COUN T l
<br /> AREA (SqMU 3.27 1.89 5.15
<br />TOTAL 5.53 3.26 8.89 AREA OF CONCERN
<br /> LENGTH eMiJ
<br />APPORTlON- AREA (SqMd 0.63 0.37 1.00 K'K'~'A Ine . Consllllln9 E"9onee<s
<br />MENT LENGTH (Mi) 0.62 0.38 1.00 7456 W. 5'h Ave Denver. Colorado
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