FLOOD03506

• County: Jefferson
• Community: Lakewood
• Stream Name: South Lakewood Gulch
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 8/1/1978
• Prepared For: Lakewood
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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SECTION VIII

PHAS E B
MAJOR ORAINAGEWAY PLANNING

TABLE VIII-l
SUMMARY OF TOTAL COSTS*
PHASE B
MAJOR ORAINAGEWAY PLANNING
SOUTH LAKEwOOD GULCH
Total
Channel Street Uti I i ty Property Improve- Present
Plan and Profile Improvement Crossing Relocation Acquisition ment worth of
Sheet Number Cos ts Costs Cos ts Costs Cost Maintenance**
1 $ 11,000 0 0 0 $ 11,000 $ 4;000
2 $145,000 0 0 0 $145,000 $ 4;000
3 $194,000 0 0 $ 60,000 $254;000 $ 7,000
4 $165,000 $243,000 $23,000 $ 80,000 $511,000 $ 13,000
5 $174;000 $316,000 $19,000 $ 39,000 $548,000 $ 14;000
6 $ 96,000 $ 93,000 $15,000 $ 48,000 $252,000 $ 14;000
7 $ 30,000 0 0 $ 10,000 $ 40,000 $ 1 ,000
TOTAL $815,000 $652,000 $57,000 $237,000 $1,761,000 $ 57,000

The consultants for the Urban Drainage and Flood Control District (UDFCD)
(Wright-McLaughlin Engineers) and for the City of Lakewood recommend a combined
alternative plan as outlined in the Phase A Addendum dated November, 1978.

The specific direction given by the UDFCD and Lakewood is stated in the
letters reproduced at the end of this section.

The recommended plan for South Lakewood Gulch is a combination of a maximum

storm water retention facility and two on-site detention storages, underground

conduit and concrete box culverts, grass-lined and where necessitated,

structural wall channel. The improvements are designed to meet the 100-year

storm criteria.

Master Plan drawings have been prepared showing the location and extent of

channel improvements and are presented at a reduced scale. Other information

on the drawings includes the existing and improved channel condition, 100-year

floodplain limits, water surface and channel profiles, cross-section locations,

R.O.W., utilities, typical sections and 100-year discharge rates for both

existing and improved conditions. The floodway and floodplain information

is tabulated in the "Flood Hazard Area Delineation, South Lakewood Gulch,

July 1971' report.

* Includes costs for engineering contingencies, fiscal, legal, and administrative
expenses. See the estimated construction cost table for individual plan and
profile sheets for the breakdown of these costs.

** Based on a 50-year project life and 6-5/8% annual interest rate.

The projected total cost of Master Plan Improvements is $1,761;000, which
includes costs for engineering contingencies, fical, legal, and administrative
expenses. No costs have been included for the 100-year water surface area
at Rockmont College or for the small farm ponds above Alameda. The present
worth of the annualized operation and maintenance costs (50-year, 6-5/8
percent) are estimated at $57,000. A summary of total costs is given in
Table VIII-I. A breakdown of these costs is presented with a commentary
of each of the Plan and Profile drawings which follow.

VIII-l