BOARD00709

• Board Meeting Date: 3/24/2003
• Description: CF Section - The Supply Irrigating Ditch Company
• Board Meetings - Doc Type: Memo

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STATE OF COLORADO

Colorado Water Conservation Board

Department of Natural Resources
1313 Sherman Street, Room 721
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
www.cwcb.state.co.us

MEMORANDUM

Bill Owens
Governor

TO:

Greg E. Walcher
Executive Director

Colorado Water Conservation Board Members

John Van Sciver ....:::rW V
Mike Serlet. P.E., Chief ~
Water Supply Planning ~ldFinance Section.

FROM:

Rod Kuharich
CWCB Director

Dan McAuliffe
Deputy Director

DATE: March 11, 2003

SUBJECT: Agenda Item 24e., March 24-26, 2003 Board Meeting
The Supply Irrigating Ditch Company

Introduction
The Supply Irrigating Ditch Company (SIDC) is applying for a loan in amount of $1,000,000 to
rehabilitate and enlarge the Knoth Reservoir Dam. The estimated total cost of the project is
$2.193,000. Please see the attached project summary and map.

Backaround
The SIDC, located in Boulder County, operates the Supply Ditch for the benefit of the
shareholders by providing direct flow irrigation water. The Supply Ditch diverts from Sl. Vrain
Creek near Lyons and delivers water through a 15-mile ditch system to the B.500-acre service
area as a partial supply. The Supply Ditch operates without an equalizer reservoir and it is difficult
to control direct flow deliveries. The SIDC has an opportunity to acquire a perpetual easement to
use the Knoth Reservoir as well as a water right to store 370 acre-feel. The reservoir would be
used to equalize ditch flows and store the decree. The SIDC would pay the cost of the
rehabilitation as a condition of acquiring these rights.

The existing Knoth Reservoir is a Class 3 structure with a capacity of 220 acre-feel. The State
Engineer has restricted the reservoir to zero storage due to seepage problems and other safety
issues. The enlarged Knoth Reservoir will be a Class 2 structure with a capacity of 540 acre-feel.
All dam safety issues will be addressed as part of the construction project.

Feasibility Studies
Duane Smith, P.E.. (Smith Geothechnical, Fort Collins), has completed the Feasibility Study. The
study includes an assessment of alternatives available for rehabilitation of the Knoth Reservoir
Dam.