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00ll2J2 Although the program will be evaluated on the basis of the response of precipitation to seeding, streamflow responses to enhanced snowfall will be quantified by an existing physically based numerical model of hydrologic processes. This watershed model will be adapted to the two main environmental areas and to several other watersheds selected to represent hydrologic conditions throughout the Basin. The model will provide the quantity and timing of additional streamflow that can be expected from snDwpack enhancement. The results of the watershed modeling can be used in benefit-cost analyses of follow-on operational seeding projects. This document provides preliminary estimates of streamflow responses to snDwpack enhancement, based on linear regression techniques. These estimates suggest that a 10 pct increase in seasonal snowfall will produce at least a 10 pct enhancement in spring and summer streamflow in most mountain drainages. Management and operation of the CREST program will be facilitated by stationing key field personnel near each of the experimental areas for the duration of the program. In addition, a group of scientists and support personnel will be located at one of the experimental area field headquarters to maxllnize communication and coordination among field personnel and analysts. During Phase I the analysis group will work full-time on analyzing the direct detection cloud seeding experiments and performing numerical model simulations. They will also design the statistical experiments, and, during Phase II, perform analyses to test the design and proper conduct of the experiments_ However, analysts will not be encumbered with the pressures of daily field operations, so they can focus on analysis and design. Too often in past experiments, analysis has been postponed until all field needs were met. This approach resulted in lack of important feedback which could have improved the experiments_ No seeding will be done until environmental compliance activities are finalized. Thereafter, environmental monitoring will be a part of the CREST to address any unresolved issues and verifY predicted environmental responses. The CREST program is expected to cost $70 million (1993 dollars) and take 8 yr to complete. The first year will be devoted to environmental compliance activities and procurement of project equipment and field support and analysis contracts. The Bureau of Reclamation, as lead agency, will spend about 25 pct of funds on program management, scientific oversight, and procurement of all major equipment. The rem~r of the funding will be expended on contracts wit~ t, private sector, universities, a.n(!.:~t~.:-~al, and other Federal agencies. I) ') ~~ ~. j ~.~~J -ft...9.. CU.Jc!3jDN~ I -Vl~,J"r '-"--{" C. ",1v-",-,,,,(t % \ '\., 41V\ JLU:-P 'u.,J~..Ac tLC("-' r. ~, "<J 0 r r .U.I<'." f 0' 6/ l!'" J ' ~ ~. '/u-/---';"''--!3. tJw,f' (u::f ("1"..-10- O'~,-:.Ul ((A.-' a (. I ~ 1 ('.' .' ,\ _1-;", " ,.:...-:;- r'._ <,'. 10 .......,/I.........t:- . '" t.- I \; .1.,. <J .... ,.. .., "/ ",..Q/ r()~.., Iii ,..,.l~(. or ~ I. . ~!lQJu_t.u\J.,.,.l(l" - _; -J. J "ly",^"ofli..-( 0 i~l: r \ r xv I;