BOARD00336

• Board Meeting Date: 7/28/2003
• Description: CF Section - New Loans - Windsor Reservoir & Canal Company - Storage Recovery Project for Windsor Reservoir No. 8 and No. 8 Annex
• Board Meetings - Doc Type: Memo

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Windsor ReseNolr & Company
July 28-29 2003

Agenda Item 21a

Total decreed storage in all reservoirs is 65,562 acre feet. Windsor Reservoir No.8 and NO.8.
Annex are adjacent, inter-connected, reservoirs. The State Engineer's Office (SEa) treats them as
one reservoir for the purpose of storage decrees, but as two for the purpose of dam safety
inspection. Windsor Reservoir No.8 and Annex No., 8 have a storage decree of 15,381 acre-feet,
but current storage capacity is 12,700 acre-feet due to sediment accumulation.

Since 1993, with the help of 3 CWCS loans, WRCC has been rehabilitating their system. '
Improvements have included lining portions of the Poudre Valley Canal; Cobb Lake outlet works
, rehabilitation; Elder Reservoir dam, outlet and spillway improvements; and Windsor Res. No.8 and
NO.8 Annex dam, outlet and spillway improvements. The rehabiiitation work on Reservoir No.8
and NO.8 annex was completed in May 2003. Draining of both reservoirs in Fall 2002 has made it
possible to excavate materials with conventional equipment, thereby creating an opportunity to
reclaim a portion of the 2,600 acre-feet loss of storag~.

Feaslbllltv Studies

Duane Smith, P.E. of Smith Geotechnical Engineering Consultants of Fort Collins has completed
the feasibility study in accordance with CWCS guidelines. The study includes an assessment of
alternatives available for recovering storage loss in the reservoir due to siltation.

The Windsor Reservoir & Canal ComDanv

WRCC is a Colorado mutual ditch company and non-profit corporation registered in the State of
Colorado in good standing. The Company was incorporated in 1890. There are 275 shareholders
holding 1000 shares of stock.

Water Rlahts

Total decreed storage in all WRCC reservoirs is 65,562 acre feet, and the firm yield of the WRCC
system is 30,200 acre feet. Windsor Reservoir No.8 and Annex No.8 have a storage decree of
15,381 acre-feet, with current storage capacity at 12,700 acre-feet due to sediment accumulation.
Recovering some of the lost storage in Windsor Reservoir No.8 and No.8 Annex will help them
secure their water right.

Project DescriDtion

Three alternatives were analyzed in the feasibility study:

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1. No-action alternative.
2. Construct a new reservoir to store the 2,600 acre-feet lost to siltation.
3. Excavate and recover a portion of the lost storage, 620 acre-feet ($750,000)

Alternative 1, No-action, was not considered viable-as It does not address the problem of lost
storage and potential loss of the water right. This alternative would not add any water to the
system and does not provide any positive impacts. Although there is no cost to take this action,
there is a cost in lost water and lost crop revenue,

Alternative 2, Construct a new reservoir to store the 2,600 acre-feet lost to siltation, was
deemed viable since it would recover all of the lost storage. However, this was seen as a more
long-term solution that would take many years to bring to fruition and was not considered a prime .
alternative at this time.

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