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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Mr. Steven J. Witte, Division Engineer
March 11, 1999
Page 2

2)

3)

Mr, Howland will determine the water available under the Highland water rights based
on the administration of upstream junior water rights as necessary to satisfy the
Highland demand and the determination of the water that needs to be passed to
senior water rights in Water District 67.

As indicated previously, the Highland stockholders will normally want all the water that is
available to them under the priority system. This will require, in some cases, administration
of upstream rights. Also, in some cases, not all the water flowing in the river at the
Highland diversion facilities will be available under the Highland water rights, In particular,
calls made under water rights in the Amity, Lamar, and Fort Bent Canals will limit the
divertable water when conservation storage is not contained in John Martin Reservoir.
Thus, the water available under the Highland rights will be the sum of the water (a) passing
over the diversion dam and (b) being diverted into the canal minus (c) that portion of the
water passing over the diversion dam not divertable because o( calls from senior water
rights in Water District 67. For example, if conservation storage is not contained in John
Martin Reservoir and the Amity is calling, not more than 24 cfs will be available under the
Highland rights.

LAWMA will distribute the available water between itself and the other stockholders
using a rotational procedure that will be similar to the way water was distributed
historically.

Water will be distributed between LAWMA and the other Highland stockholders in a rotation
whereby all stockholders receive water equivalent to a "full head" for three days. A full
head in this context is 0.01645 cfs per share, derived by dividing the full decreed diversion
rate of 62.5 ds by 3,800 shares. Consequently, a rotation will require that a total of 372
acre-feet (62.5 x.3 x 1.9835) be available to the Highland rights. A rotation will begin by
delivering 6.88 cfs to the non-LAWMA stockholders for three days. LAWMA will get the
water not required in this delivery until a total of 372 acre-feet has been registered under
the Highland water rights. Then another rotation will start. A rotation will take slightly less
than 8 days when only 24 cfs are available under the rights. The following tabulation shows
the shares of stock and full-head deliveries for non-LAWMA owners:

Owner Shares Full head, cfs
Davidson 181 2.98
Nelson 50 0.82
Waldrop 20 0.33
Spady 167 2.75
Total 418 6.88 cfs

We have estimated for initial use that a diversion of 9.88 cfs will be necessary to make
deliveries of 6.88 ds to the non-LAWMA stockholders. This estimate is based roughly on
our previous estimates that the losses in the Highland Canal for the system as a whole
averaged about 10 percent historically. This diversion rate can be broken down into the
6.88 cfs delivered to these stockholders, 0.76 ds of "historical" canal loss, and 2.24 ds of
additional water that is being left in the canal to protect these users from additional canal
losses. LAWMA will monitor the deliveries to these other stockholders. however. and will
adjust the diversion rate up or down as necessary to provide the proper head of water to
these stockholders. When less than 9.88 cfs is available. all the water will be delivered to
the non-LAWMA stockholders until 40.9 acre-feet (6.88 x 3 x 1.9835) have been delivered