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RSI MARINE Stormwater Narrative 06-01-2022 SET RSI MARINE Chanhassen, MN For RSI MARINE STORMWATER MANAGEMENT NARRATIVE & SUMMARY June, 1, 2022 I hereby certify that this plan and report were prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. __________________________ Joel G. Cooper P.E. License No. 18495 EXISTING CONDITIONS The RSI site is located at the northeast corner of Flying Cloud Drive and Great Plains Blvd. The existing site was previously constructed with a building and parking lot for an animal daycare and overnight facility. The site has both hydrologic soil groups B and C on-site. The predominate soil group for the site is hydrologic group C. The site drains from north to south and drains to the Flying Cloud Drive ditch along the north side of the road and eventually drains to across the road and to Rice Lake. The site ranges in elevation from 798 on the north side to 726 on the south side. The property is currently sitting empty and not being utilized. The vegetation is a combination of grass and trees. PROPOSED CONDITIONS The site is being proposed to be developed into four (4) buildings of 20,000 square feet each with an access off of Flying Cloud Drive in the southeast corner of the property. The proposed development will collect storm water from the building and drive and direct the stormwater into a stormwater pond in the southwest corner of the property through an on-site storm sewer system. The proposed site has been modeled using HydroCAD with Atlas 14 stormwater events for the 1,2,10 and 100-year events. The proposed and existing stormwater run-off rates for the site are as follows: YEAR EXISTING PROPOSED The infiltration for the site will be provided with a filtration pond adjacent to the stormwater pond. The proposed site will have 2.99 acres or 130,220 square feet of impervious surface. The impervious surface is required to infiltrate the first one inch of stormwater runoff. The proposed infiltration required is 130,220 sq ft x 1 inch/12inch or 10,852 cubic feet. The infiltration volume provided is 16,921 cubic feet. WATER QUALITY We have modeled the site using P8 to determine the pre-development loading for the site and the post-development loading. The following is a summary of the model results: EXISTING PROPOSED TSS 429.2 lbs/yr 20.7 lbs/yr TP 1.8 lbs/yr 0.4 lbs/yr 1 YEAR 5.99 c.f.s. 5.03 c.f.s. 2 YEAR 8.37 c.f.s 6.60 c.f.s 10 YEAR 23.65 c.f.s. 9.75 c.f.s 100 YEAR 45.21 c.f.s. 16.53 c.f.s The TSS and TP for the proposed development is less than the existing site conditions and meets the requirements of the lower Minnesota River Watershed requirements. We have attached the HydroCAD and P8 model for your review. If you have any questions, please call. Sincerely, James R Hill, Inc. Joel G. Cooper P.E. President 1S EX SUBCATCHMENT Routing Diagram for RSI Marine site Chanhassen,Mn 23953 Prepared by JRH INC, Printed 5/6/2022 HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link EXISTING RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 2HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 7.860 74 >75% Grass cover, Good, HSG C (1S) 0.410 98 Paved parking, HSG C (1S) 8.270 75 TOTAL AREA EXISTING RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 3HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 8.270 HSG C 1S 0.000 HSG D 0.000 Other 8.270 TOTAL AREA EXISTING MSE 24-hr 3 1 year Rainfall=2.50"RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 4HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX SUBCATCHMENT Runoff = 5.99 cfs @ 12.28 hrs, Volume= 0.448 af, Depth= 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 1 year Rainfall=2.50" Area (ac) CN Description 7.860 74 >75% Grass cover, Good, HSG C 0.410 98 Paved parking, HSG C 8.270 75 Weighted Average 7.860 95.04% Pervious Area 0.410 4.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.3 270 0.2000 0.34 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 2.7 290 0.0138 1.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.9 130 0.1080 2.30 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: EX SUBCATCHMENT Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)6 5 4 3 2 1 0 MSE 24-hr 3 1 year Rainfall=2.50" Runoff Area=8.270 ac Runoff Volume=0.448 af Runoff Depth=0.65" Flow Length=690' Tc=16.9 min CN=75 5.99 cfs EXISTING MSE 24-hr 3 2 year Rainfall=2.87"RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 5HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX SUBCATCHMENT Runoff = 8.37 cfs @ 12.27 hrs, Volume= 0.604 af, Depth= 0.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 2 year Rainfall=2.87" Area (ac) CN Description 7.860 74 >75% Grass cover, Good, HSG C 0.410 98 Paved parking, HSG C 8.270 75 Weighted Average 7.860 95.04% Pervious Area 0.410 4.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.3 270 0.2000 0.34 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 2.7 290 0.0138 1.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.9 130 0.1080 2.30 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: EX SUBCATCHMENT Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 2 year Rainfall=2.87" Runoff Area=8.270 ac Runoff Volume=0.604 af Runoff Depth=0.88" Flow Length=690' Tc=16.9 min CN=75 8.37 cfs EXISTING MSE 24-hr 3 10 year Rainfall=4.87"RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 6HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX SUBCATCHMENT Runoff = 23.65 cfs @ 12.26 hrs, Volume= 1.616 af, Depth= 2.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 10 year Rainfall=4.87" Area (ac) CN Description 7.860 74 >75% Grass cover, Good, HSG C 0.410 98 Paved parking, HSG C 8.270 75 Weighted Average 7.860 95.04% Pervious Area 0.410 4.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.3 270 0.2000 0.34 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 2.7 290 0.0138 1.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.9 130 0.1080 2.30 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: EX SUBCATCHMENT Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 10 year Rainfall=4.87" Runoff Area=8.270 ac Runoff Volume=1.616 af Runoff Depth=2.34" Flow Length=690' Tc=16.9 min CN=75 23.65 cfs EXISTING MSE 24-hr 3 100 year Rainfall=7.38"RSI Marine site Chanhassen,Mn 23953 Printed 5/6/2022Prepared by JRH INC Page 7HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: EX SUBCATCHMENT Runoff = 45.21 cfs @ 12.26 hrs, Volume= 3.092 af, Depth= 4.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 100 year Rainfall=7.38" Area (ac) CN Description 7.860 74 >75% Grass cover, Good, HSG C 0.410 98 Paved parking, HSG C 8.270 75 Weighted Average 7.860 95.04% Pervious Area 0.410 4.96% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.3 270 0.2000 0.34 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 2.7 290 0.0138 1.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.9 130 0.1080 2.30 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: EX SUBCATCHMENT Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 MSE 24-hr 3 100 year Rainfall=7.38" Runoff Area=8.270 ac Runoff Volume=3.092 af Runoff Depth=4.49" Flow Length=690' Tc=16.9 min CN=75 45.21 cfs 1S Pond drainage 2S Direct runoff 1P Stormwater pond 3L offsite total Routing Diagram for Proposed RSI Marine site Chanhassen 23953 Prepared by JRH INC, Printed 5/6/2022 HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link PROPOSED Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 2HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 5.470 74 >75% Grass cover, Good, HSG C (1S, 2S) 2.790 98 Paved parking, HSG C (1S, 2S) 8.260 82 TOTAL AREA PROPOSED Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 3HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 8.260 HSG C 1S, 2S 0.000 HSG D 0.000 Other 8.260 TOTAL AREA PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 4HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pond drainage Runoff = 9.54 cfs @ 12.25 hrs, Volume= 0.636 af, Depth= 1.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 1 year Rainfall=2.50" Area (ac) CN Description 2.660 98 Paved parking, HSG C 4.570 74 >75% Grass cover, Good, HSG C 7.230 83 Weighted Average 4.570 63.21% Pervious Area 2.660 36.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 145 0.3300 0.37 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.9 115 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 7.9 100 0.1000 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.4 75 0.0300 3.52 Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: Pond drainage Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 1 year Rainfall=2.50" Runoff Area=7.230 ac Runoff Volume=0.636 af Runoff Depth=1.06" Flow Length=435' Tc=15.8 min CN=83 9.54 cfs PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 5HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Direct runoff Runoff = 1.03 cfs @ 12.21 hrs, Volume= 0.064 af, Depth= 0.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 1 year Rainfall=2.50" Area (ac) CN Description 0.130 98 Paved parking, HSG C 0.900 74 >75% Grass cover, Good, HSG C 1.030 77 Weighted Average 0.900 87.38% Pervious Area 0.130 12.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 100 0.0200 0.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.9 50 0.3300 0.43 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 12.2 150 Total Subcatchment 2S: Direct runoff Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)1 0 MSE 24-hr 3 1 year Rainfall=2.50" Runoff Area=1.030 ac Runoff Volume=0.064 af Runoff Depth=0.74" Flow Length=150' Tc=12.2 min CN=77 1.03 cfs PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 6HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Pond 1P: Stormwater pond Inflow Area = 7.230 ac, 36.79% Impervious, Inflow Depth = 1.06" for 1 year event Inflow = 9.54 cfs @ 12.25 hrs, Volume= 0.636 af Outflow = 4.61 cfs @ 12.49 hrs, Volume= 0.636 af, Atten= 52%, Lag= 14.4 min Primary = 4.61 cfs @ 12.49 hrs, Volume= 0.636 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 16,171 sf Storage= 16,922 cf Peak Elev= 728.01' @ 12.49 hrs Surf.Area= 16,921 sf Storage= 25,323 cf (8,402 cf above start) Plug-Flow detention time= 318.6 min calculated for 0.248 af (39% of inflow) Center-of-Mass det. time= 52.1 min ( 877.3 - 825.2 ) Volume Invert Avail.Storage Storage Description #1 726.00' 82,927 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 726.00 6,391 0 0 727.50 16,171 16,922 16,922 728.00 16,909 8,270 25,192 730.00 20,005 36,914 62,106 731.00 21,638 20,822 82,927 Device Routing Invert Outlet Devices #1 Primary 724.20'18.0" Round Culvert L= 29.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 724.20' / 723.95' S= 0.0086 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 727.50'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 2 725.50'18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 725.50' / 725.50' S= 0.0000 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #4 Device 1 730.50'48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.61 cfs @ 12.49 hrs HW=728.01' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 4.61 cfs of 17.24 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 4.61 cfs @ 2.33 fps) 3=Culvert (Passes 4.61 cfs of 5.35 cfs potential flow) 4=Orifice/Grate ( Controls 0.00 cfs) PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 7HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Pond 1P: Stormwater pond Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=7.230 ac Peak Elev=728.01' Storage=25,323 cf 9.54 cfs 4.61 cfs PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 8HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: Stormwater pond Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 726.00 6,391 0 726.05 6,717 328 726.10 7,043 672 726.15 7,369 1,032 726.20 7,695 1,409 726.25 8,021 1,802 726.30 8,347 2,211 726.35 8,673 2,636 726.40 8,999 3,078 726.45 9,325 3,536 726.50 9,651 4,011 726.55 9,977 4,501 726.60 10,303 5,008 726.65 10,629 5,531 726.70 10,955 6,071 726.75 11,281 6,627 726.80 11,607 7,199 726.85 11,933 7,788 726.90 12,259 8,392 726.95 12,585 9,014 727.00 12,911 9,651 727.05 13,237 10,305 727.10 13,563 10,975 727.15 13,889 11,661 727.20 14,215 12,364 727.25 14,541 13,083 727.30 14,867 13,818 727.35 15,193 14,569 727.40 15,519 15,337 727.45 15,845 16,121 727.50 16,171 16,922 727.55 16,245 17,732 727.60 16,319 18,546 727.65 16,392 19,364 727.70 16,466 20,185 727.75 16,540 21,010 727.80 16,614 21,839 727.85 16,688 22,672 727.90 16,761 23,508 727.95 16,835 24,348 728.00 16,909 25,192 728.05 16,986 26,039 728.10 17,064 26,890 728.15 17,141 27,745 728.20 17,219 28,604 728.25 17,296 29,467 728.30 17,373 30,334 728.35 17,451 31,204 728.40 17,528 32,079 728.45 17,606 32,957 728.50 17,683 33,840 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 728.55 17,760 34,726 728.60 17,838 35,616 728.65 17,915 36,509 728.70 17,993 37,407 728.75 18,070 38,309 728.80 18,147 39,214 728.85 18,225 40,123 728.90 18,302 41,037 728.95 18,380 41,954 729.00 18,457 42,875 729.05 18,534 43,799 729.10 18,612 44,728 729.15 18,689 45,660 729.20 18,767 46,597 729.25 18,844 47,537 729.30 18,921 48,481 729.35 18,999 49,429 729.40 19,076 50,381 729.45 19,154 51,337 729.50 19,231 52,297 729.55 19,308 53,260 729.60 19,386 54,227 729.65 19,463 55,199 729.70 19,541 56,174 729.75 19,618 57,153 729.80 19,695 58,135 729.85 19,773 59,122 729.90 19,850 60,113 729.95 19,928 61,107 730.00 20,005 62,106 730.05 20,087 63,108 730.10 20,168 64,114 730.15 20,250 65,125 730.20 20,332 66,139 730.25 20,413 67,158 730.30 20,495 68,180 730.35 20,577 69,207 730.40 20,658 70,238 730.45 20,740 71,273 730.50 20,822 72,312 730.55 20,903 73,355 730.60 20,985 74,402 730.65 21,066 75,454 730.70 21,148 76,509 730.75 21,230 77,569 730.80 21,311 78,632 730.85 21,393 79,700 730.90 21,475 80,771 730.95 21,556 81,847 731.00 21,638 82,927 PROPOSED MSE 24-hr 3 1 year Rainfall=2.50"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 9HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Link 3L: offsite total Inflow Area = 8.260 ac, 33.78% Impervious, Inflow Depth = 1.02" for 1 year event Inflow = 5.03 cfs @ 12.46 hrs, Volume= 0.700 af Primary = 5.03 cfs @ 12.46 hrs, Volume= 0.700 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Inflow Area=8.260 ac 5.03 cfs 5.03 cfs PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 10HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pond drainage Runoff = 12.21 cfs @ 12.25 hrs, Volume= 0.809 af, Depth= 1.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 2 year Rainfall=2.87" Area (ac) CN Description 2.660 98 Paved parking, HSG C 4.570 74 >75% Grass cover, Good, HSG C 7.230 83 Weighted Average 4.570 63.21% Pervious Area 2.660 36.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 145 0.3300 0.37 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.9 115 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 7.9 100 0.1000 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.4 75 0.0300 3.52 Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: Pond drainage Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 2 year Rainfall=2.87" Runoff Area=7.230 ac Runoff Volume=0.809 af Runoff Depth=1.34" Flow Length=435' Tc=15.8 min CN=83 12.21 cfs PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 11HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Direct runoff Runoff = 1.40 cfs @ 12.21 hrs, Volume= 0.084 af, Depth= 0.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 2 year Rainfall=2.87" Area (ac) CN Description 0.130 98 Paved parking, HSG C 0.900 74 >75% Grass cover, Good, HSG C 1.030 77 Weighted Average 0.900 87.38% Pervious Area 0.130 12.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 100 0.0200 0.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.9 50 0.3300 0.43 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 12.2 150 Total Subcatchment 2S: Direct runoff Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)1 0 MSE 24-hr 3 2 year Rainfall=2.87" Runoff Area=1.030 ac Runoff Volume=0.084 af Runoff Depth=0.98" Flow Length=150' Tc=12.2 min CN=77 1.40 cfs PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 12HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Pond 1P: Stormwater pond Inflow Area = 7.230 ac, 36.79% Impervious, Inflow Depth = 1.34" for 2 year event Inflow = 12.21 cfs @ 12.25 hrs, Volume= 0.809 af Outflow = 5.97 cfs @ 12.48 hrs, Volume= 0.809 af, Atten= 51%, Lag= 14.0 min Primary = 5.97 cfs @ 12.48 hrs, Volume= 0.809 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 16,171 sf Storage= 16,922 cf Peak Elev= 728.13' @ 12.48 hrs Surf.Area= 17,114 sf Storage= 27,448 cf (10,526 cf above start) Plug-Flow detention time= 241.6 min calculated for 0.420 af (52% of inflow) Center-of-Mass det. time= 47.9 min ( 868.1 - 820.1 ) Volume Invert Avail.Storage Storage Description #1 726.00' 82,927 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 726.00 6,391 0 0 727.50 16,171 16,922 16,922 728.00 16,909 8,270 25,192 730.00 20,005 36,914 62,106 731.00 21,638 20,822 82,927 Device Routing Invert Outlet Devices #1 Primary 724.20'18.0" Round Culvert L= 29.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 724.20' / 723.95' S= 0.0086 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 727.50'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 2 725.50'18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 725.50' / 725.50' S= 0.0000 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #4 Device 1 730.50'48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=5.97 cfs @ 12.48 hrs HW=728.13' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 5.97 cfs of 17.66 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Passes 5.97 cfs of 6.37 cfs potential flow) 3=Culvert (Inlet Controls 5.97 cfs @ 3.38 fps) 4=Orifice/Grate ( Controls 0.00 cfs) PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 13HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Pond 1P: Stormwater pond Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=7.230 ac Peak Elev=728.13' Storage=27,448 cf 12.21 cfs 5.97 cfs PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 14HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: Stormwater pond Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 726.00 6,391 0 726.05 6,717 328 726.10 7,043 672 726.15 7,369 1,032 726.20 7,695 1,409 726.25 8,021 1,802 726.30 8,347 2,211 726.35 8,673 2,636 726.40 8,999 3,078 726.45 9,325 3,536 726.50 9,651 4,011 726.55 9,977 4,501 726.60 10,303 5,008 726.65 10,629 5,531 726.70 10,955 6,071 726.75 11,281 6,627 726.80 11,607 7,199 726.85 11,933 7,788 726.90 12,259 8,392 726.95 12,585 9,014 727.00 12,911 9,651 727.05 13,237 10,305 727.10 13,563 10,975 727.15 13,889 11,661 727.20 14,215 12,364 727.25 14,541 13,083 727.30 14,867 13,818 727.35 15,193 14,569 727.40 15,519 15,337 727.45 15,845 16,121 727.50 16,171 16,922 727.55 16,245 17,732 727.60 16,319 18,546 727.65 16,392 19,364 727.70 16,466 20,185 727.75 16,540 21,010 727.80 16,614 21,839 727.85 16,688 22,672 727.90 16,761 23,508 727.95 16,835 24,348 728.00 16,909 25,192 728.05 16,986 26,039 728.10 17,064 26,890 728.15 17,141 27,745 728.20 17,219 28,604 728.25 17,296 29,467 728.30 17,373 30,334 728.35 17,451 31,204 728.40 17,528 32,079 728.45 17,606 32,957 728.50 17,683 33,840 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 728.55 17,760 34,726 728.60 17,838 35,616 728.65 17,915 36,509 728.70 17,993 37,407 728.75 18,070 38,309 728.80 18,147 39,214 728.85 18,225 40,123 728.90 18,302 41,037 728.95 18,380 41,954 729.00 18,457 42,875 729.05 18,534 43,799 729.10 18,612 44,728 729.15 18,689 45,660 729.20 18,767 46,597 729.25 18,844 47,537 729.30 18,921 48,481 729.35 18,999 49,429 729.40 19,076 50,381 729.45 19,154 51,337 729.50 19,231 52,297 729.55 19,308 53,260 729.60 19,386 54,227 729.65 19,463 55,199 729.70 19,541 56,174 729.75 19,618 57,153 729.80 19,695 58,135 729.85 19,773 59,122 729.90 19,850 60,113 729.95 19,928 61,107 730.00 20,005 62,106 730.05 20,087 63,108 730.10 20,168 64,114 730.15 20,250 65,125 730.20 20,332 66,139 730.25 20,413 67,158 730.30 20,495 68,180 730.35 20,577 69,207 730.40 20,658 70,238 730.45 20,740 71,273 730.50 20,822 72,312 730.55 20,903 73,355 730.60 20,985 74,402 730.65 21,066 75,454 730.70 21,148 76,509 730.75 21,230 77,569 730.80 21,311 78,632 730.85 21,393 79,700 730.90 21,475 80,771 730.95 21,556 81,847 731.00 21,638 82,927 PROPOSED MSE 24-hr 3 2 year Rainfall=2.87"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 15HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Link 3L: offsite total Inflow Area = 8.260 ac, 33.78% Impervious, Inflow Depth = 1.30" for 2 year event Inflow = 6.60 cfs @ 12.38 hrs, Volume= 0.893 af Primary = 6.60 cfs @ 12.38 hrs, Volume= 0.893 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=8.260 ac 6.60 cfs 6.60 cfs PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 16HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pond drainage Runoff = 22.99 cfs @ 12.24 hrs, Volume= 1.520 af, Depth= 2.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 10 year Rainfall=4.27" Area (ac) CN Description 2.660 98 Paved parking, HSG C 4.570 74 >75% Grass cover, Good, HSG C 7.230 83 Weighted Average 4.570 63.21% Pervious Area 2.660 36.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 145 0.3300 0.37 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.9 115 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 7.9 100 0.1000 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.4 75 0.0300 3.52 Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: Pond drainage Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSE 24-hr 3 10 year Rainfall=4.27" Runoff Area=7.230 ac Runoff Volume=1.520 af Runoff Depth=2.52" Flow Length=435' Tc=15.8 min CN=83 22.99 cfs PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 17HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Direct runoff Runoff = 2.97 cfs @ 12.21 hrs, Volume= 0.174 af, Depth= 2.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 10 year Rainfall=4.27" Area (ac) CN Description 0.130 98 Paved parking, HSG C 0.900 74 >75% Grass cover, Good, HSG C 1.030 77 Weighted Average 0.900 87.38% Pervious Area 0.130 12.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 100 0.0200 0.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.9 50 0.3300 0.43 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 12.2 150 Total Subcatchment 2S: Direct runoff Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 MSE 24-hr 3 10 year Rainfall=4.27" Runoff Area=1.030 ac Runoff Volume=0.174 af Runoff Depth=2.03" Flow Length=150' Tc=12.2 min CN=77 2.97 cfs PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 18HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Pond 1P: Stormwater pond Inflow Area = 7.230 ac, 36.79% Impervious, Inflow Depth = 2.52" for 10 year event Inflow = 22.99 cfs @ 12.24 hrs, Volume= 1.520 af Outflow = 8.53 cfs @ 12.54 hrs, Volume= 1.520 af, Atten= 63%, Lag= 18.1 min Primary = 8.53 cfs @ 12.54 hrs, Volume= 1.520 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 16,171 sf Storage= 16,922 cf Peak Elev= 728.79' @ 12.54 hrs Surf.Area= 18,131 sf Storage= 39,023 cf (22,102 cf above start) Plug-Flow detention time= 155.5 min calculated for 1.131 af (74% of inflow) Center-of-Mass det. time= 45.2 min ( 852.6 - 807.4 ) Volume Invert Avail.Storage Storage Description #1 726.00' 82,927 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 726.00 6,391 0 0 727.50 16,171 16,922 16,922 728.00 16,909 8,270 25,192 730.00 20,005 36,914 62,106 731.00 21,638 20,822 82,927 Device Routing Invert Outlet Devices #1 Primary 724.20'18.0" Round Culvert L= 29.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 724.20' / 723.95' S= 0.0086 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 727.50'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 2 725.50'18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 725.50' / 725.50' S= 0.0000 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #4 Device 1 730.50'48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=8.53 cfs @ 12.54 hrs HW=728.79' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 8.53 cfs of 19.70 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Passes 8.53 cfs of 17.92 cfs potential flow) 3=Culvert (Inlet Controls 8.53 cfs @ 4.82 fps) 4=Orifice/Grate ( Controls 0.00 cfs) PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 19HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Pond 1P: Stormwater pond Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=7.230 ac Peak Elev=728.79' Storage=39,023 cf 22.99 cfs 8.53 cfs PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 20HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: Stormwater pond Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 726.00 6,391 0 726.05 6,717 328 726.10 7,043 672 726.15 7,369 1,032 726.20 7,695 1,409 726.25 8,021 1,802 726.30 8,347 2,211 726.35 8,673 2,636 726.40 8,999 3,078 726.45 9,325 3,536 726.50 9,651 4,011 726.55 9,977 4,501 726.60 10,303 5,008 726.65 10,629 5,531 726.70 10,955 6,071 726.75 11,281 6,627 726.80 11,607 7,199 726.85 11,933 7,788 726.90 12,259 8,392 726.95 12,585 9,014 727.00 12,911 9,651 727.05 13,237 10,305 727.10 13,563 10,975 727.15 13,889 11,661 727.20 14,215 12,364 727.25 14,541 13,083 727.30 14,867 13,818 727.35 15,193 14,569 727.40 15,519 15,337 727.45 15,845 16,121 727.50 16,171 16,922 727.55 16,245 17,732 727.60 16,319 18,546 727.65 16,392 19,364 727.70 16,466 20,185 727.75 16,540 21,010 727.80 16,614 21,839 727.85 16,688 22,672 727.90 16,761 23,508 727.95 16,835 24,348 728.00 16,909 25,192 728.05 16,986 26,039 728.10 17,064 26,890 728.15 17,141 27,745 728.20 17,219 28,604 728.25 17,296 29,467 728.30 17,373 30,334 728.35 17,451 31,204 728.40 17,528 32,079 728.45 17,606 32,957 728.50 17,683 33,840 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 728.55 17,760 34,726 728.60 17,838 35,616 728.65 17,915 36,509 728.70 17,993 37,407 728.75 18,070 38,309 728.80 18,147 39,214 728.85 18,225 40,123 728.90 18,302 41,037 728.95 18,380 41,954 729.00 18,457 42,875 729.05 18,534 43,799 729.10 18,612 44,728 729.15 18,689 45,660 729.20 18,767 46,597 729.25 18,844 47,537 729.30 18,921 48,481 729.35 18,999 49,429 729.40 19,076 50,381 729.45 19,154 51,337 729.50 19,231 52,297 729.55 19,308 53,260 729.60 19,386 54,227 729.65 19,463 55,199 729.70 19,541 56,174 729.75 19,618 57,153 729.80 19,695 58,135 729.85 19,773 59,122 729.90 19,850 60,113 729.95 19,928 61,107 730.00 20,005 62,106 730.05 20,087 63,108 730.10 20,168 64,114 730.15 20,250 65,125 730.20 20,332 66,139 730.25 20,413 67,158 730.30 20,495 68,180 730.35 20,577 69,207 730.40 20,658 70,238 730.45 20,740 71,273 730.50 20,822 72,312 730.55 20,903 73,355 730.60 20,985 74,402 730.65 21,066 75,454 730.70 21,148 76,509 730.75 21,230 77,569 730.80 21,311 78,632 730.85 21,393 79,700 730.90 21,475 80,771 730.95 21,556 81,847 731.00 21,638 82,927 PROPOSED MSE 24-hr 3 10 year Rainfall=4.27"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 21HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Link 3L: offsite total Inflow Area = 8.260 ac, 33.78% Impervious, Inflow Depth = 2.46" for 10 year event Inflow = 9.75 cfs @ 12.29 hrs, Volume= 1.693 af Primary = 9.75 cfs @ 12.29 hrs, Volume= 1.693 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=8.260 ac 9.75 cfs 9.75 cfs PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 22HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pond drainage Runoff = 47.98 cfs @ 12.24 hrs, Volume= 3.246 af, Depth= 5.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 100 year Rainfall=7.38" Area (ac) CN Description 2.660 98 Paved parking, HSG C 4.570 74 >75% Grass cover, Good, HSG C 7.230 83 Weighted Average 4.570 63.21% Pervious Area 2.660 36.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 145 0.3300 0.37 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.9 115 0.0200 2.12 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 7.9 100 0.1000 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" 0.4 75 0.0300 3.52 Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: Pond drainage Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)50 45 40 35 30 25 20 15 10 5 0 MSE 24-hr 3 100 year Rainfall=7.38" Runoff Area=7.230 ac Runoff Volume=3.246 af Runoff Depth=5.39" Flow Length=435' Tc=15.8 min CN=83 47.98 cfs PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 23HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Direct runoff Runoff = 6.84 cfs @ 12.20 hrs, Volume= 0.404 af, Depth= 4.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 100 year Rainfall=7.38" Area (ac) CN Description 0.130 98 Paved parking, HSG C 0.900 74 >75% Grass cover, Good, HSG C 1.030 77 Weighted Average 0.900 87.38% Pervious Area 0.130 12.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.3 100 0.0200 0.16 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 1.9 50 0.3300 0.43 Sheet Flow, Grass: Short n= 0.150 P2= 2.87" 12.2 150 Total Subcatchment 2S: Direct runoff Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)7 6 5 4 3 2 1 0 MSE 24-hr 3 100 year Rainfall=7.38" Runoff Area=1.030 ac Runoff Volume=0.404 af Runoff Depth=4.71" Flow Length=150' Tc=12.2 min CN=77 6.84 cfs PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 24HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Pond 1P: Stormwater pond Inflow Area = 7.230 ac, 36.79% Impervious, Inflow Depth = 5.39" for 100 year event Inflow = 47.98 cfs @ 12.24 hrs, Volume= 3.246 af Outflow = 12.87 cfs @ 12.62 hrs, Volume= 3.246 af, Atten= 73%, Lag= 22.9 min Primary = 12.87 cfs @ 12.62 hrs, Volume= 3.246 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 16,171 sf Storage= 16,922 cf Peak Elev= 730.44' @ 12.62 hrs Surf.Area= 20,720 sf Storage= 71,021 cf (54,099 cf above start) Plug-Flow detention time= 122.0 min calculated for 2.857 af (88% of inflow) Center-of-Mass det. time= 53.2 min ( 845.4 - 792.2 ) Volume Invert Avail.Storage Storage Description #1 726.00' 82,927 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 726.00 6,391 0 0 727.50 16,171 16,922 16,922 728.00 16,909 8,270 25,192 730.00 20,005 36,914 62,106 731.00 21,638 20,822 82,927 Device Routing Invert Outlet Devices #1 Primary 724.20'18.0" Round Culvert L= 29.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 724.20' / 723.95' S= 0.0086 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 727.50'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 2 725.50'18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 Inlet / Outlet Invert= 725.50' / 725.50' S= 0.0000 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #4 Device 1 730.50'48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=12.87 cfs @ 12.62 hrs HW=730.44' TW=0.00' (Dynamic Tailwater) 1=Culvert (Passes 12.87 cfs of 24.08 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Passes 12.87 cfs of 56.19 cfs potential flow) 3=Culvert (Inlet Controls 12.87 cfs @ 7.28 fps) 4=Orifice/Grate ( Controls 0.00 cfs) PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 25HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Pond 1P: Stormwater pond Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)50 45 40 35 30 25 20 15 10 5 0 Inflow Area=7.230 ac Peak Elev=730.44' Storage=71,021 cf 47.98 cfs 12.87 cfs PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 26HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: Stormwater pond Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 726.00 6,391 0 726.05 6,717 328 726.10 7,043 672 726.15 7,369 1,032 726.20 7,695 1,409 726.25 8,021 1,802 726.30 8,347 2,211 726.35 8,673 2,636 726.40 8,999 3,078 726.45 9,325 3,536 726.50 9,651 4,011 726.55 9,977 4,501 726.60 10,303 5,008 726.65 10,629 5,531 726.70 10,955 6,071 726.75 11,281 6,627 726.80 11,607 7,199 726.85 11,933 7,788 726.90 12,259 8,392 726.95 12,585 9,014 727.00 12,911 9,651 727.05 13,237 10,305 727.10 13,563 10,975 727.15 13,889 11,661 727.20 14,215 12,364 727.25 14,541 13,083 727.30 14,867 13,818 727.35 15,193 14,569 727.40 15,519 15,337 727.45 15,845 16,121 727.50 16,171 16,922 727.55 16,245 17,732 727.60 16,319 18,546 727.65 16,392 19,364 727.70 16,466 20,185 727.75 16,540 21,010 727.80 16,614 21,839 727.85 16,688 22,672 727.90 16,761 23,508 727.95 16,835 24,348 728.00 16,909 25,192 728.05 16,986 26,039 728.10 17,064 26,890 728.15 17,141 27,745 728.20 17,219 28,604 728.25 17,296 29,467 728.30 17,373 30,334 728.35 17,451 31,204 728.40 17,528 32,079 728.45 17,606 32,957 728.50 17,683 33,840 Elevation (feet) Surface (sq-ft) Storage (cubic-feet) 728.55 17,760 34,726 728.60 17,838 35,616 728.65 17,915 36,509 728.70 17,993 37,407 728.75 18,070 38,309 728.80 18,147 39,214 728.85 18,225 40,123 728.90 18,302 41,037 728.95 18,380 41,954 729.00 18,457 42,875 729.05 18,534 43,799 729.10 18,612 44,728 729.15 18,689 45,660 729.20 18,767 46,597 729.25 18,844 47,537 729.30 18,921 48,481 729.35 18,999 49,429 729.40 19,076 50,381 729.45 19,154 51,337 729.50 19,231 52,297 729.55 19,308 53,260 729.60 19,386 54,227 729.65 19,463 55,199 729.70 19,541 56,174 729.75 19,618 57,153 729.80 19,695 58,135 729.85 19,773 59,122 729.90 19,850 60,113 729.95 19,928 61,107 730.00 20,005 62,106 730.05 20,087 63,108 730.10 20,168 64,114 730.15 20,250 65,125 730.20 20,332 66,139 730.25 20,413 67,158 730.30 20,495 68,180 730.35 20,577 69,207 730.40 20,658 70,238 730.45 20,740 71,273 730.50 20,822 72,312 730.55 20,903 73,355 730.60 20,985 74,402 730.65 21,066 75,454 730.70 21,148 76,509 730.75 21,230 77,569 730.80 21,311 78,632 730.85 21,393 79,700 730.90 21,475 80,771 730.95 21,556 81,847 731.00 21,638 82,927 PROPOSED MSE 24-hr 3 100 year Rainfall=7.38"Proposed RSI Marine site Chanhassen 23953 Printed 5/6/2022Prepared by JRH INC Page 27HydroCAD® 10.00-25 s/n 00744 © 2019 HydroCAD Software Solutions LLC Summary for Link 3L: offsite total Inflow Area = 8.260 ac, 33.78% Impervious, Inflow Depth = 5.30" for 100 year event Inflow = 16.53 cfs @ 12.24 hrs, Volume= 3.650 af Primary = 16.53 cfs @ 12.24 hrs, Volume= 3.650 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Inflow Primary Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420Flow (cfs)18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=8.260 ac 16.53 cfs 16.53 cfs P8 Urban Catchment Model, Version 3.5 Case RSI_EX.p8c Title Startup Case PrecFile MSP4918.pcp PartFile nurp50.p8p Case Title Startup Case Case Data File RSI_EX.p8c Path G:\MSOFFICE\AA Docs\RSI Marine\p8\ Case Notes: Storm Data File MSP4918.pcp Particle File nurp50.p8p Air Temp File File MSP4918.tem Time Steps Per Hour 4 Minimum Inter-Event Time (hrs) 10 Maximum Continuity Error % 2 Rainfall Breakpoint (inches) 0.8 Precipitation Scale Factor 1 Air Temp Offset (deg-F) 0 Loops Thru Storm File 1 Simulation Dates Start 6/1/1970 Keep 1/1/1971 Stop 12/31/1972 Max Snowfall Temperature (deg-f) 32.0 SnowMelt Temperature (deg-f) 32.0 Snowmelt Coef (in/degF-Day) 0.06 Soil Freeze Temp (deg-F) 32.0 Snowmelt Abstraction Factor 1.00 Evapo-Trans. Calibration Factor 1.00 Growing Season Start Month 5 Growing Season End Month 10 5-Day Antecedent Rainfall + Runoff (inches) CN Antecedent Moisture Condition AMC-II AMC-III Growing Season 1.40 2.10 NonGrowing Season 0.50 1.10 Watershed Data Watershed Name Existing Site Runoff to Device Outflow Infiltration to Device Watershed Area 8.27 SCS Curve Number (Pervious) 74 Scale Factor for Pervious Runoff Load 1 Indirectly Connected Imperv Fraction 0 UnSwept Impervious Fraction 0.05 UnSwept Depression Storage (inches) 0.02 UnSwept Imperv. Runoff Coefficient 1 UnSwept Scale Factor for Particle Loads 1 Swept Impervious Fraction 0 Swept Depression Storage (inches) 0.02 Swept Imperv. Runoff Coefficient 1 Swept Scale Factor for Particle Loads 1 Sweeping Frequency 0 Sweeping Efficiency 1 Sweeping Start Date (MMDD) 101 Sweeping Stop Date (MMDD) 1231 Device Data Device Name Outflow Device Type PIPE Infiltration Outlet Normal Outlet Spillway Outlet Particle Removal Scale Factor Bottom Elevation (ft) Bottom Area (acres) Permanent Pool Area (acres) Permanent Pool Volume (ac-ft) Perm Pool Infilt Rate (in/hr) Flood Pool Area (acres) Flood Pool Volume (ac-ft) Flood Pool Infilt Rate (in/hr) Infilt Basin Void Fraction (%) Detention Pond Outlet Parameters Outlet Type Outlet Orifice Diameter (in) Orifice Discharge Coef Outlet Weir Length (ft) Weir Discharge Coef Perforated Riser Height (ft) Number of Holes in Riser Holes Diameter Flood Pool Drain Time (hrs) Swale Parameters Length of Flow Path (ft) Slope of Flow Path % Bottom Width (ft) Side Slope (ft-v/ft-h) Maximum Depth of Flow (ft) Mannings n Constant Hydraulic Model Pipe, Splitter, Aquifer Parameter Hydraulic Res. Time (hrs) 0 Particle Data Particle File nurp50.p8p Particle Class P0% P10% P30% P50% P80% Filtration Efficiency (%) 90 100 100 100 100 Settling Velocity (ft/hr) 0 0.03 0.3 1.5 15 First Order Decay Rate (1/day) 0 0 0 0 0 2nd Order Decay (1/day-ppm) 0 0 0 0 0 Impervious Runoff Conc (ppm) 1 0 0 0 0 Pervious Runoff Conc (ppm) 1 100 100 100 200 Pervious Conc Exponent 0 1 1 1 1 Accum. Rate (lbs-ac-day) 0 1.75 1.75 1.75 3.5 Particle Removal Rate (1/day) 0 0.25 0.25 0.25 0.25 Washoff Coefficient 0 20 20 20 20 Washoff Exponent 0 2 2 2 2 Sweeper Efficiency 0 0 0 5 15 Water Quality Component Data Component Name TSS TP TKN CU PB ZN Water Quality Criteria (ppm) Level 1 5 0.025 2 2 0.02 5 Level 2 10 0.05 1 0.0048 0.014 0.0362 Level 3 20 0.1 0.5 0.02 0.15 0.38 Content Scale Factor 1 1 1 1 1 1 Particle Composition (mg/kg) P0% 0 99000 600000 13600 2000 64000 P10% 1000000 3850 15000 340 180 1600 P30% 1000000 3850 15000 340 180 1600 P50% 1000000 3850 15000 340 180 1600 P80% 1000000 0 0 340 180 0 P8 Urban Catchment Model, Version 3.5 Run Date 05/26/22 Case RSI_PROP.p8c FirstDate 01/01/71 Precip(in) 50.4 Title Startup Case LastDate 12/31/72 Rain(in) 40.76 PrecFile MSP4918.pcp Events 134 Snow(in) 9.67 PartFile nurp50.p8p TotalHrs 16440 TotalYrs 1.88 Case Title Startup Case Case Data File RSI_PROP.p8c Path G:\MSOFFICE\AA Docs\RSI Marine\p8\ Case Notes: Storm Data File MSP4918.pcp Particle File nurp50.p8p Air Temp File File MSP4918.tem Time Steps Per Hour 10 Minimum Inter-Event Time (hrs) 10 Maximum Continuity Error % 2 Rainfall Breakpoint (inches) 0.8 Precipitation Scale Factor 1 Air Temp Offset (deg-F) 0 Loops Thru Storm File 1 Simulation Dates Start 6/1/1970 Keep 1/1/1971 Stop 12/31/1972 Max Snowfall Temperature (deg-f) 32.0 SnowMelt Temperature (deg-f) 32.0 Snowmelt Coef (in/degF-Day) 0.06 Soil Freeze Temp (deg-F) 32.0 Snowmelt Abstraction Factor 1.00 Evapo-Trans. Calibration Factor 1.00 Growing Season Start Month 5 Growing Season End Month 10 5-Day Antecedent Rainfall + Runoff (inches) CN Antecedent Moisture Condition AMC-II AMC-III Growing Season 1.40 2.10 NonGrowing Season 0.50 1.10 Watershed Data Watershed Name 1S 2S Runoff to Device POND 1P POND 1P Infiltration to Device Watershed Area 7.23 1.03 SCS Curve Number (Pervious) 74 74 Scale Factor for Pervious Runoff Load 1 1 Indirectly Connected Imperv Fraction 0 0.126 UnSwept Impervious Fraction 0.368 0 UnSwept Depression Storage (inches) 0.02 0.02 UnSwept Imperv. Runoff Coefficient 1 1 UnSwept Scale Factor for Particle Loads 1 1 Swept Impervious Fraction 0 0 Swept Depression Storage (inches) 0.02 0.02 Swept Imperv. Runoff Coefficient 1 1 Swept Scale Factor for Particle Loads 1 1 Sweeping Frequency 0 0 Sweeping Efficiency 1 1 Sweeping Start Date (MMDD) 101 101 Sweeping Stop Date (MMDD) 1231 1231 Device Data Device Name POND 1PPOND 1P - FILTRATION BENCHOUTFLOW Device Type POND INF_BASIN PIPE Infiltration Outlet OUTFLOW Normal Outlet POND 1P - FILTRATION BENCH Spillway Outlet OUTFLOW OUTFLOW Particle Removal Scale Factor 1 1 Bottom Elevation (ft) 722 726 Bottom Area (acres) 0.03 0.15 Permanent Pool Area (acres) 0.11 Permanent Pool Volume (ac-ft) 0.34 Perm Pool Infilt Rate (in/hr) 0 Flood Pool Area (acres) 0.23 0.18 Flood Pool Volume (ac-ft) 0.68 0.25 Flood Pool Infilt Rate (in/hr) 0 1 Infilt Basin Void Fraction (%) 100 Detention Pond Outlet Parameters Outlet Type WEIR Outlet Orifice Diameter (in) Orifice Discharge Coef Outlet Weir Length (ft) 115 Weir Discharge Coef 3 Perforated Riser Height (ft) Number of Holes in Riser Holes Diameter Flood Pool Drain Time (hrs) Swale Parameters Length of Flow Path (ft) Slope of Flow Path % Bottom Width (ft) Side Slope (ft-v/ft-h) Maximum Depth of Flow (ft) Mannings n Constant Hydraulic Model Pipe, Splitter, Aquifer Parameter Hydraulic Res. Time (hrs) 0 Particle Data Particle File nurp50.p8p Particle Class P0% P10% P30% P50% P80% Filtration Efficiency (%) 90 100 100 100 100 Settling Velocity (ft/hr) 0 0.03 0.3 1.5 15 First Order Decay Rate (1/day) 0 0 0 0 0 2nd Order Decay (1/day-ppm) 0 0 0 0 0 Impervious Runoff Conc (ppm) 1 0 0 0 0 Pervious Runoff Conc (ppm) 1 100 100 100 200 Pervious Conc Exponent 0 1 1 1 1 Accum. Rate (lbs-ac-day) 0 1.75 1.75 1.75 3.5 Particle Removal Rate (1/day) 0 0.25 0.25 0.25 0.25 Washoff Coefficient 0 20 20 20 20 Washoff Exponent 0 2 2 2 2 Sweeper Efficiency 0 0 0 5 15 Water Quality Component Data Component Name TSS TP TKN CU PB ZN HC Water Quality Criteria (ppm) Level 1 5 0.025 2 2 0.02 5 0.1 Level 2 10 0.05 1 0.0048 0.014 0.0362 0.5 Level 3 20 0.1 0.5 0.02 0.15 0.38 1 Content Scale Factor 1 1 1 1 1 1 1 Particle Composition (mg/kg) P0% 0 99000 600000 13600 2000 64000 250000 P10% 1000000 3850 15000 340 180 1600 22500 P30% 1000000 3850 15000 340 180 1600 22500 P50% 1000000 3850 15000 340 180 1600 22500 P80% 1000000 0 0 340 180 0 22500