FLOOD02983

• County: Arapahoe
• Community: Littleton
• Stream Name: Lee Gulch, Little Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 9/1/1978
• Prepared For: Littleton
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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I. INTRODUCTION

II. STUDY AREA

The "Major Drainageway Planning for Lee Gulch and Little Creek, Phase

A" report was prepared for the Urban Drainage and Flood Control District~

Littleton, and Arapahoe County by KKBNA in October, 1977. The Phase A report

analyzes the hydrology and hydraulics of the two streams, the impact of

flooding, and the costs and benefits of alternative solutions to the flooding

problems. This Phase B report presents the conceptual and preliminary design

for the selected alternatives in sufficient detail for planning purposes and

for proceeding with final design plans and specifications.

GENERAL

The plan selected after evaluation of the Phase A report by the Urban

Drainage and Flood Control District, The City of Littleton, and Arapahoe

County was re-examined and final hydrological and hydraulic studies were

made. A preliminary drainage and flood control design based upon the se-

lected plan is presented in plan and profile drawings and cost estimates

are tabulated by reach and jurisdictional responsibility.

Lee Gulch and Little Creek have contiguous drainage basins located

generally in an envelope bounded on the north by Littleton Boulevard, the

south by County Line Road, the east by University Boulevard, and the west

by the South Platte River. The indexing system completed in project REUSE

designated the Lee Gulch drainage basin as 1-05-6000-01 and the Little

Creek drainage basin as 1-05-5800-01. Both basins drain generally in a

north-westerly direction to the South Platte River, with both basins ex-

tending from Littleton into the unincorporated area of Arapahoe County.

The upper portion of the Lee Gulch basin extends into Douglas County and

is included in this report for information and runoff purposes only.

Figure I shows the location and jurisdictional responsibility of the drain-

age basins.

Soils in the basins consist of: Alluvial Land - Nunn Association

along the South Platte River flood plain; Nunn-Bresser-Ascalon Association

in the lower half of Little Creek; Fondis-Weld Association in the upper

portions of Little Creek and central portion of Lee Gulch; Renohill-Buick-

Litle Association in the remainder of Lee Gulch and upper central part of

Little Creek. The Alluvial Land-Nunn Association soils are characterized

by high water tables and severe wind erosion unless protected along streams;

and deep, well drained, with moderate to high water holding capacity in ad-

jacent terraces. The Nunn-Bresser-Ascalon Association characteristics range

from those of terrace areas, above, to deep soil with rapid water intake and

moderate water holding capacity; unprotected areas are subject to severe

water and wind erosion. The Fondis-Weld Association characteristics are:

taking water at a moderate rate; high water holding capacity; slight erosion

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