CC WORKSESSION 06292015 - Laserfiche WebLink

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Units Existing Needed Proposed Direct Overland Drainage Area ac 22.68 -22.68 Direct Storm Sewer Drainage Area ac 174.72 -191.16 Indirect Drainage Area ac 42.91 -42.91 Total Drainage Area into Mirror Pond ac 240.31 -256.75 Dead Pool Storage ac-ft 35.50 32 40.92 Flood Pool Storage ac-ft 45.92 -82.88 Total Storage ac-ft 81.42 -123.80 Total Excavation ac-ft --26.3 NWL ft 920.86 -918.86 Average Pond Depth ft 3.8 4.3 Primary Outlet in Wear @ 920.86 -12 inch orifice Secondary Outlet in existing 18 inch -Wear @ 921.3 Third Outlet in --existing 18 inch EOF ft 925.4 -926.5 HWL ft 921.29 -919.35 Draw Down Time hr 24 48 24 Pond Bounce ft 0.43 -0.49 HWL ft 922.75 -921.21 Draw Down Time hr 36 -90 Pond Bounce ft 1.89 -2.35 HWL ft 924.31 -922.80 Draw Down Time hr 60 -102 Pond Bounce ft 3.44 -3.94 HWL ft 925.64 -924.89 Draw Down Time hr 66 -108 Pond Bounce ft 4.78 -6.03 HWL ft 925.75 -926.12 Draw Down Time hr 72 -120 Pond Bounce ft 4.89 -7.26 Pipe Flow cfs 12.41 -12.79 Over Land Flow cfs 38.39 -0.0 Pipe Volume ft3 2,685,206 -3,732,954 Over Land Volume ft3 991,848 -0.0 Pipe Flow cfs 27.09 -- Over Land Flow cfs 29.23 -16.7 Pipe Volume ft3 261,901 -- Over Land Volume ft3 27,499 -5371.3 Pipe Flow cfs 73.34 -73.32 Over Land Flow cfs 195.81 -192.6 Pipe Volume ft3 5,223,097 -5,242,010 Over Land Volume ft3 587,193 -387,623 TSS Into Pond lb/yr 47,678 -51,397 TSS Leaving Pond lb/yr 3,539 -3,843 TSS Trapped lb/yr 44,139 -47,554 TSS Percent Reduction %92.58 -92.52 TP Into Pond lb/yr 159 -171 TP Leaving Pond lb/yr 58 -63 TP Trapped lb/yr 101 -108 TP Percent Reduction %63.36 -63.41 TSS removed by Vegetated Buffer lb/yr --6,500 TP removed by Vegetated Buffer lb/yr --7 TSS removed by Shoreline Stabilisation lb/yr --4,100 TP removed by Shoreline Stabilisation lb/yr --8 Removal of unconsolidated nutrient rich soils from pond (average 2 feet) *RCWD estimates TP removed by 2 foot average excavation lb/yr --46-77 Shoreline Stabilization Pollutant Removal Results (BWSR Pollution Reduction Estimator, Sheet&Rill) 2000 - 2011 Historical Rain Events and NURP50 Files Used Pond Pollutant Removal Results (P8 Model) Buffer Strip Pollutant Removal Results (BWSR Pollution Reduction Estimator, Filter Strip) 7.38 Inch Atlas Event (100-year) Max Flow Out of Mirror Pond (Link MIRP-MIR1) Total Volume Out of Mirror Pond (Link MIRP-MIR1) Max Flow Down Chandler Dr. NE (Link CD18-CD17) Total Volume Down Chandler Dr. NE (Link CD18-CD17) Max Flow to RCJD 3 (Link FR5-FR4) Total Volume to RCJD 3 (Link FR5-FR4) Mirror Pond Flood Results 1.1 Inch Atlas 14 Event 2.83 Inch Atlas 14 Event (2-year) 4.24 Inch Atlas 14 Event (10-year) 6.00 Inch TP 40 Event (100-year) 7.38 Inch Atlas 14 Event (100-year) Results Summary