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CRDSS
<br />TASK MEMORANDUM 1.14-23
<br />Consumptive Use Model
<br />Non-Evapotranspiration (Other Uses) Consumptive Uses and Losses
<br />in the Gunnison River Basin
<br />1.0 ISSUE
<br />This task memorandum formalizes the verification/implementation of the CRDSS consumptive use (CU)
<br />model for the Gunnison River basin as a prototype. It only includes the non-evapotranspiration
<br />categories such as livestock, stock pond, reservoir, municipal, thermal electric, mineral resource and
<br />export. These categories maintain the same categories included in the U.S. Bureau of Reclamation
<br />(USBR) Colorado River System Consumptive Uses and Losses Report, 1981-1985, which is produced
<br />every 5 years. A separate task memorandum is prepared for the evapotranspiration category (Task
<br />Memorandum 1.14-22). The verification was initially planned for 1 year (1985), but has been
<br />implemented for 6 years (1985-90).
<br />2.0 DISCUSSION/ANALYSIS
<br />The computation of the consumptive uses and losses from the entire Gunnison River basin can be done
<br />either by county (Delta, Gunnison, Hinsdale, Mesa, Montrose, Ouray, and Saguache) or by hydrologic
<br />unit (HU) (14020001, 14020002, 14020003, 14020004, 14020005, 14020006). The USBR uses the
<br />intersection of counties and HUs as the subdivisions for its Colorado River System Consumptive Uses
<br />and Losses Report, 1981-1985 . Thus, the Gunnison River basin has been subdivided into 15 subareas
<br />that are the result of intersecting the counties and the HUs. These include the subareas (1) Delta County
<br />in HU14020002, (2) Delta in HU14020004, (3) Delta in HU14020005, (4) Delta in HU14020006, (5)
<br />Gunnison in HU14020001, (6) Gunnison in HU14020002, (7) Gunnison in HU14020003, (8) Gunnison
<br />in HU14020004, (9) Hinsdale in HU14020002, (10) Mesa in HU14020005, (11) Montrose in
<br />HU14020002, (12) Montrose in HU14020005, (13) Montrose in HU14020006, (14) Ouray in
<br />HU14020006, and (15) Saguache in HU14020003. However, since some of the data, such as population
<br />and number of livestock, are officially available and published by county only, spatial interpolation is
<br />performed to obtain the equivalent data for smaller subareas.
<br />The time-series data are provided by months to preserve unit consistency across different categories. For
<br />data, such as population and number of livestock, that are reported officially by years, the monthly
<br />values are assumed to be equal to the annual values. Monthly coefficients are provided (defaults = 1.0)
<br />in order to account for the monthly variations in the values, if necessary.
<br />Livestock
<br />As in the USBR Colorado River System Consumptive Uses and Losses Report, 1981-1985, only three
<br />types of livestock are included: cattle, sheep, and hogs. Table 1 shows the average daily water
<br />consumption of each livestock type.
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<br />A275 01.09.9 5 1.14-23 Manguerra
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