PROJ00301

• Contract/PO #: C153442
• Contractor Name: Fuchs Ranches, Inc.
• Contract Type: Loan
• Water District: 20
• County: Rio Grande
• Bill Number: HB 83-1102
• Loan Projects - Doc Type: Feasibility Study

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length of the 60-inch closed conduit is about 110 feet (see Figures II
and V). A new channel would be excavated beginning at the downstream
end of the spi 11 way conduit and extend to the natural stream channel,
as shown on Figure II. The elevation of the service spillway crest is
202.2 feet (gage height 17.2 feet).

A new emergency earth and riprap lined spillway and spillway
channe 1 will be const ructed on natu ra 1 ground east of the exi st i ng
spillway. The existing spillway would be removed and the area back-
fi 11 ed and compacted with the most impervi ous materi a 1 avail ab 1 e at
the damsite. A buried concrete wall, 92 feet in length, would be
constructed to serve as the spillway crest. Figure II shows the loca-
tion of the emergency spillway in plan, and Figure III shows the loca-
tion of.the spillway in profile along the dam centerline. Figure VII
shows the spillway and channel in profile parallel to the direction of
flow. The emergency spillway would function very infrequently as the
service spillway would pass most of the floods at the dam.

The pu rpose of the emergency spi 11 way is to ensu re that the
100-year inflow design flood could be routed through the reservoir and
spi 11 way without overtopping the dam, assuming the flow through the
service spillway was significantly reduced due to plugging with
debris, etc. Table A-4 and Figure A-2, in Appendix A, present the
spi 11 way rat i ng data for both the proposed servi ce and emergency
spillways for Alternative No.1.

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