WSP11220

• File Number: 8281.300
• Description: Colorado River Studies and Investigations - Colorado River Consumptive Uses and Losses Report
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 3/1/1991
• Title: Decree Accounting -- methodology used for monthly and yearly water-use accounting of Colorado River water -- Part 2 of 2
• Water Supply Pro - Doc Type: Report/Study

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furnished by the. CRC.
not been reported, so

date, pumping of recharged water from
proposed recharge procedures have not

storage has
been used.

To
the

Nevada State Denartment of Fish and Game (Denartment of Wildlife) - Return
flows for the Nevada Fish and Game are furnished to Reclamation monthly by
this user. They also furnish a yearly summary. Records are filed in the
Decree Accounting Binder.

Boulder Citv - Return flows for Boulder City are its share of the line losses.
proportioned according to its share of the total water diverted (water
diverted to the National Park Service. Boulder Canyon Project, and Boulder
City) shown on the Boulder Canyon Project report submitted monthly from Hoover
Dam. As a formula, it ocould be expressed as'

[BC Diversion/Total DivertedJXWater Line Losses

The Boulder Canyon Project report is found in the Decree Accounting binder in
the BC Water Supply Operating Report section.

Citv of Needles - Although the City of Needles has informed Reclamation that
they ceased submitting the Report of Colorado River Water Pumped and Returned
to River (monthly report) in February 1989. they did submit a summary for 1989
usage in May. of 1990 upon Reclamation request. A response to an earlier
Reclamation request, which outlines the reasons for the City of Needles not
continuing to submit the requested monthly report, is included at the end of
Section 3B. The 1989 summary provided by the City of Needles reflects an
accoun~ing procedure which Reclamation at this time has not accepted. The
summary was used, however. to compute the 1989 consumptive use for. the Ci~y of
Needles. Return flows were taken to be only the returns from the Sewer Plant.
No 1990 su..ary has appeared at the time of this writing. It appears likely
that another request for the 1990 data will have to be made.

Me~oDolitan Water District - Return flows credits for MWD for final
accounting are the sum of the seepage flows from Copper Basin Reservoir and
Gene Wash Reservoir at Copper Creek No.1. Gene Canyon No.1. and Desilt and
Eureka Washes. minus 15 acre-feet for phreatophyte use per month. These
records are supplied somewhat irregularly by MWD. At times it is necessary to
request MWD to continue sending them. Monthly accounting procedures use an
estimate of 10 acre-feet per day for return flow credit. The USGS reports in
their Water~Oata Report that this 10 acre-feet amount "is used for accounting
.
purposes.. This is only accurate in that it npplies to monthly accounting

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