WSP06233

• File Number: 8143.800
• Description: John Martin Reservoir - Water and Contracts
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1999
• Title: Report of the Colorado State Engineer - Concerning Accounting of the Operations of an Offset Account in John Martin Reservoir for Colorado Pumping - 1998 -- Part 2 of 2
• Water Supply Pro - Doc Type: Report/Study

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year, if appropriate. If you have any questions, please contact me or Dale Straw for further

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STATE OF COLORl\DO

WATER DIVISION 2
OFFICE OF THE STATE ENGINEER

310 Easl Abriendo, Suite B
Pueblo. Colorado 61004
Phone: [phone]
'^X, (7191 544,0800

httpJ/waler.state.co.us/default.hlm

February 12,1999

8.\1 ()WL'r1L
CIIVerlll)r

Don Higbee
Lower Arkansas Water Management Association
PO Box 1161
Lamar, CO 81052

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H.11 D. Slmps.on, I'.f.
51,11e EnRineer
Sleven I. Wille, ,'[
Olvi~ion Enginecr

Duane D. Helton
Helton & Williamsen, P.C,
384 Inverness Drive South, Suite 144
Englewood, CO 80112

RE:

Measurement of LAWMA's Highland Canal Water Rlghls

Dear Mr. Higbee & Mr. Helton:

We have reviewed your February 9, 1999 submittal on behalf of the Lower Arkansas
Water Management Association (LAWMA) requesting permission for and assistance in the
establishment and use of a gaging station on the Purgatoire River for determining water
available to LAWMA's Highland Canal water rights. After a preliminary review of your request,
I'm requesting that you provide additional information for use in completing the review and
evaluation of your request.

For the purpose of evaluating your proposal, assume that the gaging station at the
headgate and the Parshall flume on the canal a short distance downstream from the diversion
facilities are in place and that both measurement points are connected to a data collection
platform. With the required equipment in place, please propose a procedure and algorithm for
using this equipment and operating the canal to generate augmentation credits from LAWMA's
Highland Canal water rights. The procedure and the algorithm should provide fDr the
determination of augmentation credits, return flow credits and the documenting, computation,
and reporting of appropriate data under the various river conditions that are possible (i.e.
slar\'lng at zero r'll/er flow al Ihe headgale and increasing 10 high !low under all r'lver call
conditions which would influence LAWMA's entitlement). Your recommended procedures for
operation of the canal should include how LAWMA will make an allowance to the shareholders
on the ditch for the additional canal loss that will occur as a result of the removal of LAWMA
water.

Thank you for preparing your request as we discussed last Fall. I'm hoping to have
enough information to complete the 'evaluation of this proposal and include the final results in
the approval letter for LAWMA's Arkansas River Replacement Plan for the 1999-2000 plan