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C): <:;) .-;l ~ ~, tv . A verage number of days water was carried in the structure during a year during the period WY 1981 to 1991. . Maximum number of days water was carried in the structure during a year during the period WY 1981 to 1991. . The maximum observed diversion in cfs at the structure on an average daily basis during the period WY 1981 to 1991. This information is tabulated by individual structure within each water district on the tables attached hereto (Attachment 2), Steps I and 2 were repeated for the period October 26, 1991 through October 31, 1995 and the results are recorded on the second half of Attachment 2 as "post 1991" data, 3, Utilizing the consumptive use model in CRDSS, we then determined what the consumptive use of water by these structures was, This was done on a water district basis, The water district information was then combined as appropriate to provide a valid comparison to information provided in the 1991 baseline, The results of this comparison are provided in the table at the end of this document. Please note that the tables in Attachment 2 may display zeros during the years used for this effort, Zeros do not mean that these structures have not diverted water. We want the USF&WS to understand that most water rights shown on the tables in Attachment 2 were decreed prior to our study period, What the zero means is that this particular structure either did not divert during our study period or that we simply have no daily record of diversions for this structure during our study period, How the USF&WS will deal with these structures is unknown, but we would encourage the USF&WS to allow the water user the opportunity to supply historic diversion data and include these rights in the environmental baseline, Also, please note that evaporation data for reservoirs is not show in the tables in Attachment 2, We have included evaporation data in our consumptive use calculations that follow and would expect reservoir evaporation to be included in the USF&WS environmental baseline, Results The tables developed under steps 1 and 2 above (Attachment 2) identify the water rights that were in existence as of October 25, 1991 and indicate how they have operated since 1981. This is information that the USF&WS has not had ready access to before, The value of having this list of water rights is that should any water right on the list require a federal permit in the future, the RP A for that water right, to the extent of its historic operations, already exists and no additional mitigation measures should be sought by the USF&WS during the Section 7 consultation process, Even though we have not included undecreed wells on the list, we would still expect wells to be covered by the existing RPA, Secondly, with respect to consumptive uses, CRDSS operates o~ a period of record that runs from WY 1975 to WY 1991 at the present time, Thus, only consumptive use 3