FLOOD03286

• County: Adams
• Community: Wheat Ridge, Arvada
• Stream Name: Lower Clear Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 10/1/1981
• Prepared For: Adams County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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SECTION VI

VI-1

PHASE B MA.JOR DRAJNAGEWAY PLAN

MAJOR DRAINAGEWAY IMPROVEMENT COSTS

GENERAL COMMENTS

The projected total cost of the Major Drainageway PI an improvements is
$10,941,600 (1981 doll ars), which incl udes costs for construction, property
acquisition. enginef>ring, contingencies, fiscal, legal and administrative
expf>nses. The annual operation and maintenance costs are estimated at
$215,000. A sunmary of total costs is given in Table VI-I. A breakr10wn of
these costs is presented with the commentaries accompanying the mapping in
Appendix D. The unit prices associated with the costs of the Major
Drainageway PI an improvements are presented in Tables VI-2 and VI-3. In
evaluating property acquisition costs, it was assuned that any property
within thf> lOa-year floodway limits \\Ould be purchased at the cost of Open
Space land. In determining operating and maintenance costs, it was assuned
that there \\Ould be no costs to local governments for maintaining the
Colorado Statf> Division of Highways channel improvements since thf>se channel s
will be maintained by the Highway Department.

The master pI an presented in this Section was developed using criteria set
forth by the local entities and the Urban Drainage and Flood Control Dis-
trict. The refinement of the master pI an incl uded the final i zation of alter-
natives for the lOa-year (1 percent) flood for future basin df>velopment, and
is presented on mapping in this report.

The following section describes the general strategies and types of improve-
ments used in this master pI an. The floodpl ain preservation strategies are
discussed in this section in a general manner. Site specific detail s are
discussed within the commentaries accompanying the mapping in Appendix D. The
mapping includes pI an and profile drawings showing the prel iminary design of
the Sel ected Major Drainageway PI an for lower Cl ear Creek, and the lOa-year
floodpl ain for existing and improved channel conditions.

The improvements util ize the design criteria contained in the Denver Regional
Council of Government's Urban Storm Drainage Criteria Manual, volunes 1 and
2. (Reference 40), and other acceptable criteria for the Denver ~tropolitan
area.

It is recommended that the following sequence be established for final design
and construction of thf> selected improvements:

1. Tennyson Street and Lowell Boulevard Improvements.
2. Of'nver and Rio Grande Western Railroad and Federal Blvd.
bridges and channel improvements.
3. Kipling Street bridge and channf>l improvemf>nts.
4. Channel improvements at the confluence with the South Platte River.
5. Pecos Street bridge, channel and road improvements.