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7/24/2015 DE FAH FL)PHASE 2—11 NEEDED 1. Preparation of mars,rb approach terhnicnl memorandum for suhmittal to and rot ie'.!approvai b ``1R':`."AD prior to simmer;r nrodelcng acti:Ices. 2. Un ow already availabl.firm the lo.al ccnrty owners,it is anticipated that surrey services will re r-yuered during this Plrase to identify aitrcaeaeahons,d'Esta ,.es and or operty boundaries-I tre survey data enll be used in denglop merit of the pro,_ct models. .1 st n'nrwater runoff an I routing model ror'.I b:needed to u.sta'.e th. HCH of the SKID cava'''system.Consultant requested and 'ce'i`'ed a copy of the recently updated HS.H model(using the advanced Inter C onnected Carol Routing soft s,are)Rom the water agproognient ristnct for simulating sarace water inflows into the reservoir. rh s H&H model will need to be capable of performing continuous simulations of srrf?ce,rater flow in the canal system over a 2C to 30 year time period to capture low average and high flocs conditions in the sur face waters ploy pr csioin flow to the reservoir.If the SKID H&H model is a storm event based model,the model e+-ill need to be revised by Consultant to simulate continuous tEasys. 4. Upon approval of the approach,Consultant will develop an operations model utilizing STELLA,a widely used systems model for evaluating inflows, outflows and storage components of systems similar to that proposed by the County.The STELLA model will be used to perform a continuous simulation of the proposed reservoir operations over a 20 to 30 year period.The model will account for hlstorrcal rainfall patterns as well as take into account surface water inflows from the SKID canals,evaporation, seepage and other releases from the reservoir (water supply and emergency overflow)on a daily basis over the 20 to 30 year time period. 5. Modeling results will be used to quantify the amount of surface water that can be anticipated during drought conditions,average rainfall conditions and during high rainfall periods.This information will then be utilized to refine the reservoir sizing evaluation performed in Phase 1.The result may be that the size of the reservoir presented in Phase 1 based on the maximum demand(population projection based)would be reduced based on actual, available flow. 6. The modeling summary will be submitted to 51RWMD for review and comment,and modeling will be updated if needed based on comments received. 7- Update recommendcrt -`e rS...d do available flow a h correspcn:'rnz zrcf ccfIrciate. . , Smith Existing Control Structures Source: SRID "11919111.111111111111.11111,11"11111111111111111 Illrler7V4777.7 • ��\ r 1 2-Gate Structure on Lateral L 3-Gate Structure on Lateral C Smith Ia`•A• 21