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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SELECTED ALTERNATIVES

REACH I: PLATTE RIVER TO ELATI STREET:

As a result of the detailed studies conducted of the drainageways, a

combination of alternatives was recommended in the Phase A report. After

several public hearings and consideration of the recommended alternatives

by the Urban Drainage District, City of Littleton, Arapahoe County and other
interested parties such as the South Suburban Parks, the following plan was

selected.

1. Re-channelize and provide erosion protection immediately east of

the AT & SF Railroad embankment to protect the existing playing

fields.
2. Inlet structure and inlet and outlet slope protection at the

Windermere Street crossing.

3. Erosion protection at the abandoned dam immediately east of Elati

Street.

4. Erosion protection at the Elati Street crossing.

GENERAL :

1. Enforcement of flood plain regulations on the 100-year flood plain.

Implicit in this is regulation of the residual 100-year flood plain

for all areas where drainageway improvements are designed to convey

less than 100-year flows.

2. Any storm sewer inlets to be provided with the recommended and/or

selected improvements should be "Type R" as designated by the Colo-

rado Department of Highways and should be designed using the Stand-
ard Curb Opening Inlet Chart in the June, 1977 issue of "Flood Haz-

REACH 2: ELATI STREET TO LOGAN STREET (EXTENDED):

ard News".

1. Provide a side-channel spillway and flow restrictor at the Highline

Canal to spill storm flows in excess of the canals needs into Lee

Gulch and provide erosion protection in the spill area.

2. Provide for additional culvert capacity at the Broadway Avenue

crossing to reduce the depth of flow to a maximum of 6 inches at

the crown as well as inlet and outlet slope protection.

3. Reconstruct the roadside channel along the east side of Broadway

from the south branch culvert crossing to the north branch to pro-

vide overflow capacity.

4. Provide a drop structure at approximately station 153+03 to stop

the stream bed erosion from moving upstream.

5. As development continues in the industrial area along Mineral Avenue

the channel should be rebuilt to contain the flows in that area.

This is the owners responsibility.

3. The purchase of flood insurance by those subject to flooding should

be encouraged.

4. The proposed flow separation structures at the Highline Canal am-

mends the structures proposed in the Highline Canal Master Plan,

dated November, 1975.

LEE GULCH:

A maintenance access trail to be constructed along all reaches. This

trail could act jointly as a maintenance access and recreational hiker/biker

trail running from the South Platte River to County Line Road.

REACH 3; LOGAN STREET (EXTENDED) TO COUNTY LINE ROAD
No structural flood control improvements are anticipated in this reach,
other than the maintenance access trail.

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