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APPENDIX G:XPSWMM RESULST FOR PHASE 1 LAKES Phase 1 model Phase 1 model Difference between the Phase 2 Difference between the Phase 2 Alt6-LAKE-V20-ca-Alt6-LAKE-V20-1a- Phase 1 model Phase 1 model Phase 1 model Model with the Model with the model with the HIGHEST model with the LOWEST WSEL Phase 2 PS-D-48 Phase 2 PS-D-48 All 1-Farm Pump- Alt 1-Farm Pump- Alt 1-Gravity-B-48 Alt 1-Gravity-C-48 Alt 2-Gravity-D-48 highest PEAK WSEL lowest PEAK WSEL WSELand the Phase 1 model and the Phase 1 model with the Lake B-48 C-48 Lake with the LOWEST WSEL HIGHEST WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL MODEL MODEL A-EL A-EL [FEET] [FEET] [FEET] [FEET] [FEET] [FEET] [FEET] [-] [-] [FEET] [FEET] 1-2 8.0 7.9 7.5 7.5 7.6 7.5 7.3 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 2-Gravity-D-48 0.7 0.3 1-2 3 8.0 7.9 7.5 7.5 7.6 7.5 7.3 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 2-Gravity-D-48 0.7 0.3 3 4 8.1 8.0 7.7 7.7 7.8 7.8 7.8 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 0.2 4 5 8.1 8.0 7.7 7.7 7.8 7.8 7.8 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 0.2 5 6 8.1 8.0 7.8 7.7 7.9 7.8 7.8 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 0.2 6 7 8.0 7.9 7.6 7.6 7.7 7.6 7.6 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-B-48 0.4 0.2 7 8 8.1 8.0 7.7 7.7 7.8 7.7 7.7 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 0.2 8 9 8.1 8.0 7.7 7.8 7.9 8.0 7.8 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-B-48 0.4 0.0 9 30 8.1 8.0 7.7 7.8 7.9 8.0 7.8 Alt6-LAKE-V20-ca-Phase 2 PS-D-48 Phase 1 model Alt 1-Farm Pump-B-48 0.4 -0.1 10 11 8.1 8.0 7.7 7.9 7.9 8.1 7.8 Phase 11 AI[1-Gravity-C-48 Phase 1 model Alt 1-Farm Pump-B-48 0.4 -0.1 11 12 7.7 7.7 7.4 7.3 7.9 8.0 7.9 Phase 1 model AI[1-Gravity-C-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 -0.3 12 13 7.7 7.7 7.4 7.3 7.9 8.0 7.9 Phase 1 model Alt 1-Gravity-C-48 Phase 1 model Alt 1-Farm Pump-C-48 0.4 -0.25 13 Lake PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL PEAK WSEL MODEL MODEL AWSEL CWSEL Lake Notes: ->Alt 6:1 active pumps by lake 3 and an equivivalent of 6 active pumps at the Phase 2 Pump Station;;Alt 1:2 active pumps by lake 3;Alt 2:3 active pumps by lake 3. --)L:Pumps in watershed A(by lake 3)pumping into lake 25 in watershed C. •ca:Hydrograph scaled based on approximated contributory drainage area;la:Hydrograph scaled based on contributory drainage area relative to lake size. •V20:Layout of the Phase 2 lake piping version 2.0 •Phase 1 Pump Station:Lake 12 is connected to the Phase 2 Pump Station(as is lake 19 and 22);Gravity,Lake 11 in Phase 1 connected by gravity pipe to lake 19 in Phase 2;Farm Pump:Temporary pump pumping to farm ditch from Lake 12 in Phase 1. B:Pipelayout according to"Model B"for Phase Hake interconnection pipes;C:Pipelayout according to"Model C"for Phase Hake interconnection pipes;D:Pipelayout according to"Model D"for Phase Hake interconnection pipes. 'See River Islands Phase 1 Stormwater Mitigation Report dated April 2020. 4 48:48-hour 100-year storm is analyzed. Phase 1 model Alt-2-Gravity-D-48 is the phase 1 model the phase 2 models are based on,though alterations has been made to the number of pumps by lake 3 and to the lake 12 connection to phase 2. Models run on: 10/30/2010 Results extracted: 11/4/2020 Models run by: FC Models location: W:IB520IEngineeringlModelinglSW River Islands Phase 2 XPSWMM12020-10-19