WSP09469 - Laserfiche WebLink

Home Browse Search

3334 5.2 EXAMPLE APPliCATION OF SIMPliFIED SCREENING MODEL To illustrate how a DSS can be applied to this project, we have perfonned an example evaluation using the screening criteria described in Section 4, This includes system yield. river re-regulation benefits (project location) and total project C05t. These correspond to criteria 15, 17, 18, and 19 shown on Figure 5,1. An example of a simplified hierarchy of planning values using only four criteria is shown on Figure 5.2, Example weighting factors are also presented in this figure, For those examples we have weighted the three overall project goals of minimizing project investment, maximizing sponsor's operational effectiveness and maximizing available water used at (),5, 0,25 and 0,25, respectively, It is important to note that the sum of these weights equals 1.0, In addition, the sum of the weight~ associated with the subgoals of minimizing WWDC cost and GVID cost also equal 1.0, For this example we have weighted these subgoals as a direct inverse of the 75 percent/25 percent WWDC financing, Once the basic scoring model has been developed, it can be easily manipulated to perfonn sensitivity analysis and illustrate the trade-offs associated with competing goals, subgoals, and objectives. Example preference relationships which may be applicable to the Greybull Valley Project are illustrated on Figure 5,3, A summary of example results for the 15 alternatives considered in our comparative evaluation is shown graphically on Figure 5.4, The score for each criteria is indicated separately by the different hatching patterns on this figure. As can be seen, the two viable recommended primary alternatives for consideration in the EIS received the highest scores in this example, The No Action alternative did not rank. in the top five of those alternatives evaluated, but must be included as a primary alternative in the EIS as specified by the Council on Environmental Quality regulations (CEQ, 40 CFR 1500-1508), 5.3 OTHER ISSUES AND PLANNING CONSIDERATIONS Some very significant additional issues associated with other goals, subgoals, and objectives were not addressed in our initial screening, These issues can be expected to develop during the EIS process, A general issue that can be expected to be raised is that the level of the evaluations associated with all alternatives, except Lower Roach Gulch, is preliminary, Key technical issues associated with yield analysis, geotechnical concerns, and constructability need to be evaluated in greater detail for each alternative, The results of these analyses may increase or decrease the reconnaissance level estimates of project investment or yields and impact the project's overall ability to meet the GVID's purpose and need, A discussion of some of these key issues follows, 5.3.1 Primary Alternatives Data extrapolations from previous modeling perfonned by SWWRC indicate that there could be 40,000 to 80,000 acre-feet of additional water available in the Upper Greybull River and lWJ7\'Jl.EPORt\1EXT.VI 5-3