PROJ02019

• Contract/PO #: FS0069FX
• Contractor Name: Fountain, City of
• Contract Type: Loan
• Water District: 0
• Loan Projects - Doc Type: Feasibility Study

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Continued use of the existing channel around the south dam abutment would
preclude any additional problems or new liability associated with potential flooding
at downstream properties. Upon lowering the spillway crest, the reservoir size
would be substantially reduced. A pond with as large a volume as possible (2 or
more acre-feet) would remain to allow for future deposition of sand and gravel.
Periodic removal of sand and gravel deposits at the upper end of the remaining
reservoir may be required, similar to past practices. Icing problems are eliminated
with the retainage of a small reservoir pool. Continued full utilization of the direct
flow water rights associated with the existing dam and diversion structure is
expected.

Proposed modifications to the outlet works intake are shown in Figure 6. A
portion of the sediments around the existing intake pipe would be removed. The
pipe would be extended vertically with a slotted well screen. Water would be
diverted both through the well screen slots during low flow and, for higher flows or
deeper lake water, through the drop inlet at the top of the pipe.

Final Desian Issues

Final design issues would include optimization of the remaining reservoir
storage to leave as large of a lake pool as possible, while limiting the dam to Minor
Size and a Hazard Class 2 or lower. Final alignment of the spillway would under go
optimization to minimize riprap and excavation.

The outlet works intake structure modifications would be designed in detail.
Issues to evaluate include using a slotted well screen standpipe for an intake
structure, and control of flow at the upstream end of the lake between the lake and
the spillway.

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