7997

• UCREFRP Catalog Number: 7997
• Author: Nash, L. L. and P. H. Gleick.
• Title: The Colorado River Basin and Climatic Change, The Sensitivity of Streamflow and Water Supply to Variations in Temperature and Precipitation.
• USFW Year: 1993.
• USFW - Doc Type: EPA 230-R-93-009,
• Copyright Material: NO

r

Climate-change Hydrologic
scenarios ~ model

Water-supply
) model

SCMs NWSRFS
SISS Reservoir
GFDL Two-elevation storage
UKMO
GISS tran8~en
Changes in CRSS
- - runaft- -? Deliveries
Uncontrolled
spills
Hypothetical Salini ty
scenarios I Animas River I

Figure 1: Schematic of study showing the relationship among various models.

available). The parties contemplated each basin eventually using equal quantities of water (7.5 mat), plus
up to another one million acre-feet for the lower basin. Subsequently, the 1944 Treaty signed by Mexico
and the United States guaranteed an annual flow Into Mexico of not less than 1.5 maf, except In times of

severe shortage. Under the Compact, the upper basin In not actually required to deliver a fixed quantity of
water at Lee Ferry In any particular year, though current operating criteria adopted by the Bureau of
Reclamation provide for releases of 8.23 maf from lake Powell annually. If the Mexican Treaty obligation Is
assumed to be shared equally by both basins (although this remains a disputed point), then the required

3