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Stormwater Management Narrative and Summary
RSI MARINE Chanhassen, MN For RSI MARINE STORMWATER MANAGEMENT NARRATIVE & SUMMARY lanuary 27 , 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 CITY OF CHANHASSEII RECEIVED JAN 2 8 2O2Z CMNHASSEN PI.AI{IIIIIG DEPI 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 site is being proposed to be developed into four (4) buildings of 20,000 square feet each wlth 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: EXISTING PROPOSED 1 YEAR 5.99 c.f.s.5.71 c.f.s Z YEAR 8.37 c.f.s 6.94 c.f.s 1O YEAR 23.65 c.f.s.10.23 c.f.s 1OO YEAR 45.21 c.f.s.18.76 c.f.s The Infiltration for the site wlll be provided with a filtration pond adjacent to the stormwater pond. The proposed site will have 2.79 acj,es ot 72!,532 square feet of impervlous surface. The impervious surface is required to infiltrate the first one inch of stormwater runoff. The proposed infiltration required is 121,532 sq ft x 1 inch/12inch or 10,128 cubic feet. The infiltration volume provided is 10,220 cubic feet. The proposed stormwater plan meets the city stormwater requirements. We have attached the HydrocAD model for your review. lf you have any questions, please call. Sincerely, James R Hlll, lnc Joel G. Cooper P.E President EXISTING CONDITIONS The property is currently sitting empty and not being utilized. The vegetation is a combination of grass and trees. PROPOSED CONDITIONS YEAR Routing Diagram for RSI Marine site Chanhassen,Mn 23953 Prepared by (enter your company name herc]., Ptirled 1127D022 HydroCAD@ 10.00-25 dn 00744 O 2019 HydroCAD Software Solutions LLC (new Subcat) RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here}Ptinled 112712022 Peoe 2HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchm ent-numbers) 7.860 0.4'10 8.270 74 98 75 >750lo Grass cover, Good, HSG C (1S) Paved parking, HSG C (1S) TOTAL AREA RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here}Prinled 112712022 Paoe 3HydroCAD@ 10.00-25 s/n 00744 @ 201 o HvdroCAD Software Solutions LLc Soil Listing (all nodes) Area (acres)Group Soil Subcatchment Numbers 0.000 0.000 8.270 0 000 0.000 8.270 HSG A HSG B HSG C HSG D Other 1S TOTAL AREA HSG.A (acres) HSG-B (acres) HSG-C (acres) HSG-D Other Total (acres) (acres) (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.000 0.000 7.860 0.410 8.270 0.000 0.000 0.000 0.000 0.000 0.000 7.860 0.410 8.270 >75% Grass cover, Good 1S Paved parking 15 TOTAL AREA RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} Ptinled 112712022 HvdroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paqe 4 Ground Covers (all nodes) RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} MSE 24-hr 3 1 year Rainfall=2.50" Prinled 112712022 Paoe 5HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.0'l hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 1S: (new Subcat)Runotf Area=8.270 ac 4.96% lmpervious Runoff Depth=0.65" Flow Length=690' Tc='l6.9 min CN=75 Runoff=s.gg cfs 0.448 af Total Runoff Area = 8.270 ac Runoff Volume = 0.448 af Average Runoff Depth = 0.65" 95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.4'10 ac RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} MSE 24-hr 3 1 year Rainfall=2.50" Ptinted 112712022 Paoe 6HvdroCAD@ 10.00-25 sln 00744 O2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: (new Subcat) Runoff = 5.99 cls @ 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 74 98 >75% Grass cover, Good, HSG C Paved oarkino. HSG C 8.270 7.860 0.410 75 Weighted Average 95.04% Pervious Area 4.96% lmpervious Area Tc Length(min) (feeo Slope Velocity Capacity Description (fUft) (fusec) (cfs) 13.3 2.7 0.9 0.2000 0.0138 0.1080 0.34 1.76 2.30 Sheet Flow, Grass: Dense n= 0.24O P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: (new Subcat) Hydrograph ! Runoff '-9 6 5 3 2 Runoff Volume=0148 af MSE 24-hr 3 Are 52 01aRnfallyear a I 72 a0 cuRnoff Flow Length=690' Runoff Depth=0.65" 0 2 4 6 810 1214 16 1A202224262830 32 34 36 38 40 42 44 46 4a 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 7.860 0.410 270 290 130 Ill I I l-* il li - --1 i i; CN=75 Tc=16.9 min RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 2 year Rainfall=2.87" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 1 0.00-25 s/n 00744 A 2Ug HydroCAD Software Solutions LLC Paae 7 Time span=0.00-72.00 hrs, dt=0.01 hrs, 720'1 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.96% lmpervious Runotf Depth=o.88" Flow Length=690' Tc=16.9 min CN=75 Runoff=8.37 cfs 0.604 af Total Runoff Area = 8.270 ac Runoff Volume = 0.604 af Average Runoff Depth = 0.88" 95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} MSE 24-hr 3 2 year Rainfall=2.87" Prinled 112712022 Paoe 8HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: (new Subcat) Runoff = 8.37 ds @ 12.27 hrs, Volume= 0.604 af, Depth= 0.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 2 year Rainfall=2.87" Area (ac) CN Description 7.860 0.410 74 98 >75% Grass cover, Good, HSG C Paved parkinq, HSG C 8.270 7.860 0.410 75 Weighted Average 95.04% Pervious Area 4.96% lmpervious Area Tc (min) Length (feet) Slope Velocity Capacity Description (fvft)(fusec) (cfs) 13.3 2.7 0.9 270 290 130 0.34 1.76 2.30 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Watenivay Kv= 15.0 fps Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: (new Subcat) Hydrograph ; I I 7 6 5 4 3 2 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 0 0 2 4 6 610 12 14 16 $ 20 22 21 26 2A 30 32 31 36 38 40 42 ,t4 46 48 50 52 54 56 58 60 62 M 66 68 70 72 Tlmo (houB) 0.2000 0.0138 0.1080 l.E;;rt 1 RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} lilSE 24-hr 3 10 year Rainfall=4.87" Ptinted 112712022 Peoe IHvdroCAD@ 10.00-25 s/n 00744 A 2019 HvdroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.960/o lmpervious Runoff Depth=2.34" Flow Length=690' Tc=16.9min CN=75 Runoff=23.65 cfs 1.616af Total Runoff Area= 8.270 ac Runoff Volume = 1.6'16 af Average Runoff Depth = 2.34" 95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac Summary for Subcatchment 1S: (new Subcat) 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 2+hr 3 10 year Rainfall=4.87" Area (ac) CN Description 7.860 0.410 74 98 >75% Grass cover, Good, HSG C Paved parkinq, HSG C 8.270 7.860 0.410 75 Weighted Average 95.04% Pervious Area 4.96% lmpervious Area Tc Length(min) (fee0 (fuft)(fUsec) (cfs) Slope Velocity Capacity Description 13.3 2.7 0.9 270 290 '130 0.2000 0.0138 0.1080 0.34 1.76 2.30 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 16.9 690 Total Subcatchment 1S: (new Subcat) Hydrograph 24 22 21 20 19 17 16 15 '.9 4 3 2 ,| 0 I I 7 6 5 I 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 GN=75 o 2 4 5 810 12 14 161820222426 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Tlm. (hour3) RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 10 year Rainfall=4.87" Prepared by {enter your company name here} Prinled 112712022 HVdToCAD@ 10.00-25 s/n 00744 O2019 HvdroCAD Software Solutions LLC Paqe 10 mr""tfl FFFH i-t_rrTl + ,l,,tllt Er6-ta'1 RSI Marine site Chanhassen,Mn 23953 MSE 24-hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 10.00-25 s/n 00744 A2U9 HydroCAD Software Solutions LLC Paoe 11 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Storlnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 1S: (new Subcat)Runoff Area=8.270 ac 4.96% lmpervious Runoff Depth=4.49" Flow Length=690' Tc=16.9 min CN=75 Runoff=45.21 cfs 3.092 af Total Runoff Are a = 8.270 ac Runoff Volume = 3.092 af Average Runoff Depth = 4.49" 95.04% Pervious = 7.860 ac 4.96% lmpervious = 0.410 ac RSI Marine site Chanhassen,Mn 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC MSE 24-hr 3 100 year Rainfall=7.38" Ptinted 112712022 Paqe 12 Summary for Subcatchment 15: (new Subcat) 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= 0.0G72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 100 year Rainfall=7.38" Area (ac) CN Description 7.860 0.410 74 98 >75% Grass cover, Good, HSG C Paved Darkinq. HSG C 75 Weighted Average 95.04% Pervious Area 4.96% lmpervious Area Tc Length(min) (fee0 Slope Velocity Capacity Description(fuft) (fusec) (cfs) o.u 1.76 2.30 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed WateMay Kv= 15.0 fps Shallow Goncentrated Flow, Short Grass Pasture Kv= 7.0 fps 50 48 46 44 Subcatchment 1S: (new Subcat) I Runoff 38 36 3,1 32 t., 224t2 20 t8 l6 14 12 't0 I 4 0 1 00 year Rainfall=7.38" Runoff Area=8.270 ac Runoff Volume=3.092 af MSE24-hr 3 CN=75 Runoff Depth=4.49" Flow Length=690' Tc=16.9 min 0 2 4 6 8 10 12 '14 16 18 m 22 24 26 28 30 32 34 36 * 10 4244,16,r8 50 52 54 56 58 60 62 64 66 68 70 72llm. (hou6) 8.270 7.860 0.410 13.3 2.7 0.9 270 290 130 0.2000 0.0138 0.1080 16.9 690 Total Hydrograph t_r I +i MI_T Routing Diagram for Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your @mpany name hete\, Pnnted 112712022 HydroCAD@ 10-0G25 gn 00744 O 2019 HldroCAD Software Solulions LLC pond drainage Direct runoff stormwater pond offsite total Reach Link@A Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Ptinled 112712022 Paoe 2 Area Listing (all nodes) Area (acres) CN Description (subcatchmenlnumbers) 5.47 0 2.790 8.260 74 98 82 >7570 Grass cover, Good, HSG C (1S,25) Paved parking, HSG C (1S,25) TOTAL AREA Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 A 2Ug HydroCAD Software Solutions LLC Ptinted 112712022 Paoe 3 Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 0.000 8.260 0.000 0.000 8.260 HSG A HSG B HSG C HSG D Other 1S, 25 TOTAL AREA Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Printed 112712022 Paqe 4 HSG-A (acres) HSG-B (acres) HSG.C (acres) Ground Covers (all nodes) HSG-D Other Total (acres) (acres) (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.000 0.000 5.470 2.790 8.260 0.000 0.000 0.000 0.000 0.000 0.000 5.47 0 2.790 8.260 >75Yo Grass cover, Good 1S,25 Paved parking 15,25 TOTALAREA Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} MSE 24-hr 3 1 year Rainfall=2.50' Prinled 112712022 HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 5 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 'lS: pond drainage Runoff Area=7.23o ac 36.790/o lmpervious Runoff Depth=1.06" Flow Length=43s' Tc=15.8min CN=83 Runoff=9.s4 cfs 0.636af Subcatchment 25: Direct runoff Runoff Area=1 .03o ac 12.620/o lmpervious Runoff Depth=0.74" Flow Length=150' f c=12.2 min CN=77 RunofF1.03 cfs 0.064 af Pond 1P: stormwater pond Peak Elev=728.05' Storage=31,789 cf lnflow=9.54 cfs 0.636 af Outflow=s.2s cfs 0.636 af Link 3L: offsite total lnflor,=S.7l cfs 0.700af Primary=5.71 cfs 0.700 af Total Runoff Area = 8.260 ac Runoff Volume = 0.700 af Average Runoff Depth = 1.02" 66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 10.00-25 s/n 00744 A 20'19 HydroCAD Software Solutions LLC Paqe6 Summary for Subcatchment'lS: pond drainage Runoff = 9.54 ds @ 12.25 hrs, Volume= 0.636 af, Depth= 1.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G.72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 1 year Rainfall=2.50" Area (ac) CN De-sAfiplloD 2.660 4.570 Paved parking, HSG C98 74 >757o Grass cover Good HSG C Tc Length(min) lfeet) 83 Weighted Average 63.21% Pervious Area 36.79% lmpervious Area Slope Velocity Capacity Description(fuft) (fusec) (cfs) 6.6 0.9 7.9 0.4 145 115 '100 75 o.37 2.12 o.21 3.52 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: pond drainage Hydrograph 8 7 6 5 10 3 2 MSE 24-hr 3 1 year Rainfall=2.50" Runoff Area=7.230 ac Runoff Volume=0.636 af Runoff Depth=l.06" FIow Length=435' Tc=l5.8 min CN=83 0 o 2 4 6 A10 12 14 16 1A 20 22 24 26 2A 30 32 34 36 38 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72 Tlm. (hourr) 7.230 4.570 2.660 0.3300 0.0200 0.1000 0.0300 I r Rr""ffl '-9II r1 t--r--# 1 Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50" Prepared by {enter your company name here} Ptinled 112712022 HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC PaAe 7 Summary for Subcatchment 25: Direct runoff Runoff = 1.03 ds @ 12.2'l hrs, Volume= 0.06,4 af, Depth= 0.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G.72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 1 year Rainfall=2.50" Area (ac) CN Description 98 74 >757o Grass cover Good HSG C Paved parking, HSG C 77 Weighted Average 87.38% Pervious Area 12.62% lmpervious Area Tc Length(min) lfeet) Slope Velocity Capacity Description(fuft) (fusec) (cfs) 't0.3 1.9 0.16 0.43 Sheet Flow, Grass: Short Sheet Flow, Grass: Short n= 0.150 n= 0.150 P2= 2.87" P2= 2.87" 12.2 150 Total Subcatchment 25: Direct runoff Hydrograph ! Runoff ] -9l! MSE 24-hr 3 'l year Rainfall=2.50" Runoff Area=1.030 ac Runoff Volume=0.064 af Runoff Depth=O.74" Flow Length=150' Tc=12.2 min CN=77 0 0 2,{ 6 810 1214 16 18 20 22 24 26 2A 30 32 U 36 38 10 1214 46 t1850 5254 56586062 6.66647072 Tlmo (houo) 0.130 0.900 1.030 0.900 0.130 '100 0.0200 50 0.3300 Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 10.00-25 sln 00744 @2019 HydroCAD Software Solutions LLC Paqe 8 Summary for Pond 'lP: stormwater pond lnflow Area = lnflow Outflow Primary Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 13,M0 sf Storage= 24,288 d Peak Elev= 728.05'@ 12.45 hrs Surf.Area= '14,020 sf Storage= 31,789 cf Plug-Flow detention time= 564.5 min calculated for 0.079 af ('12% of inflow) Center-of-Mass det. time= 41 .3 min ( 866.5 - 825.2 ) 7.230 ac, 36.79% lmpervious, lnflow Depth = 1 .06" for 1 year event 9.54 cfs @ 12.25 hts, Volume= 0.636 af 5.25 cfs @ 12.45 hrs, Volume= 0.636 af, Atten= 45ol0, Lag= 12.2 ^ n 5.25 cfs @ 12.45 hrs, Volume= 0.636 af (7,501 cf above start) Volume lnvert Avail.Storage Storage Description #1 722.00',79,976 cf Custom Stage Data (Prismatic) Listed below (Recalc) lnc.Store Cum.Store(cubic-feet) (cubic-feet) Elevation (feet) Surf.Area (sq-ft) Device Routinq 0 4,4U 6,960 12,8U 6,744 30,976 17,968 lnvert Outlet Devices 1,616 2,U8 4,112 '13,040 13,936 17,O40 18,896 0 4,4U 11,424 24,288 31,O32 62,008 79.976 727.50' 725.50', Device 1 Device 2 18.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 lnlet / Outlet lnveft= 724.20' I 723.95' S= 0.01 00'/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 lnlet / Outlet lnvert= 725.50' I 725.50' S= 0.0000 '/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 48.0" Horiz Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 #3 #4 Device 1 730.50' mary OutFlow Max=5.25 cfs @ 12.45 hrs HW=728.05' TW=0.00' (Dynamic Tailwater) =Culvert (Passes 5.25 cfs of 17.78 cfs potential flow) harp-Crested Rectangular Weir (Weir Controls 5.25 cfs @ 2.43 fps) utvert (Passes 5.25 cfs of 5.59 cfs potential flow) ce/Grate ( Controls 0.00 cfs) 722.00 724.OO 726.00 727.50 728.00 730.00 731.00 #1 Primary 724.20' Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HvdroCAD@ 10.00-25 sln 00744 O 2019 HydroCAD Software Solutions LLC MSE 24-hr 3 1 year Rainfall=2.50" Printed 112712022 Paqe 9 Pond 1P: stormwater pond Hydrograph O 216 810121416 18202221 243/) 323,{363840 124161850525156 5a606264 666a7072 Tlm. (hour.) ! lnflowI Primary t 7 6 5 3 2 0 lnflow Area=7230 ac Peak Elev=728.05' Storage=31,789 cfrf-! ^. l L-l ll Elevation (feet) Su rface (sq-ft) Storage (cubic-feet) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 1 year Rainfall=2.50" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 10 Stage-Area-Storage for Pond 1P: stormwater pond Elevation (feet) Surface Storage(sqjt) (cubicjeet) 722.00 722.10 722.20 722.30 722.40 722.50 722.60 722.70 722.80 722.90 723.O0 723.10 723.20 723.30 723.40 723.50 t 23_bu 723.70 723.80 723.90 724.00 724.10 724.20 724.30 724.40 724.50 724.60 724.70 724.80 724.90 725.00 725.10 725.20 725.30 725.40 725.50 725.60 725.70 725.80 725.90 726.O0 726.10 726.20 726.30 726.40 726.50 726.60 726.7 0 726.80 726.90 727 .00 727 .10 '1,616 1 ,678 1 ,739 1,801 1 ,862 1 ,924 1 ,986 2,047 2,109 2,170 2,232 2,294 2,355 2,417 2,478 2,540 2,602 2,663 2,725 2,786 2,848 2,g',t 1 2,974 3,038 3,101 3,164 3,227 e ,)on 3,354 3,417 3,480 3,543 3,606 3,670 3,733 3,796 3,859 3,922 3,986 4,049 4,112 4,707 5,302 5,898 6,493 7,088 7,683 8,278 8,874 9,469 10,064 10,659 16s 336 513 AOA 885 1,080 1,282 1,490 1,704 1 ,924 2,150 2,383 2,621 2,866 3,117 3,374 3,637 3,907 4,182 4,464 4,752 5,046 5,U7 5,654 5,967 6,287 6,612 6,945 7 ,283 I ,OZA 7 ,979 8,337 8,700 9,071 9,447 9,830 10,219 10,614 11,016 11,424 'l'1,865 12,365 12,925 13,U5 14,224 14,963 '15,761 16,618 17 ,535 18,512 19,548 727 .20 727 .30 727 .40 727 .50 727 .60 727 .70 727 .80 727 .90 728.00 728.10 728.20 728.30 728.40 728.50 728.60 728.70 728.80 728.90 729.00 729.10 729.20 729.30 729.40 729.50 729.60 729.70 729.80 729.90 730.00 730.10 730.20 730.30 730.40 730.50 730.60 730.70 730.80 730.90 73'1.00 11,254 1 1,850 12,445 13,040 13,219 13,398 13,578 13,7 57 13,936 14,091 14,246 14,402 14,557 14,712 14,867 15,022 15,178 15,333 15,488 15,643 15,798 15,954 16,109 16,264 16,419 16,57 4 16,730 16,885 17 ,040 17 ,226 17 ,411 17,597 17,782 17,968 18,154 18,339 18,52s 18,710 18,896 20,644 21,799 23,014 24,288 25,601 26,932 28,281 29,U7 3't ,032 32,433 33,850 35,283 36,731 38,194 39,673 41 ,167 42,677 44,203 45,744 47 ,301 48,873 50,460 52,063 53,682 55,316 56,966 58,631 60,312 62,008 63,721 65,453 67 ,204 68,972 70,760 72,566 74,391 76,234 78,096 79,976 Summary for Link 3L: offsite total lnflow Area = 8.260 ac, 33.78% lmpervious, lnflow Depth = 1.02" for 1 year eventlnflow = 5.71 cfs @ 12.43 hrs, Volume= 0.700 af Primary = 5.71 cfs @ 12.43 hrs, Volume= 0.700 af, Atten= 0%, Lag= g.g , n Primary outflow = lnflow, Time Span= 0.0G72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Hydrograph I lnflow I Pri,nary 0 2 4 6 81012 1416 1Am2224 2AN32 3,( 36 38 40 42 tl4 4a 48 50 52 54 56 58 60 8264666a70 72 Tlmo (hou6) . 6 5 3 2 Proposed RSI Marine site Chanhassen 23953 lvlSE 24-hr 3 1 year Rainfall=2.50" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paoe 11 1 rrttl lnflow Area=8.260 ac Time span=0.0G72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 1S: pond drainage Runoff Area=7.230 ac 36.790lo lmpervious Runoff Depth=1.34" Flow Length=43s' Tc=15.8min CN=83 Runoff=12.21 cfs 0.809af Subcatchment 25: Direct runoff Runoff Area=1 .030 ac 12.620/o lmpervious Runoff Depth=o.98" Flow Length=150' f c=12.2 min CN=77 Runoff=1.40 cfs 0.084 af Pond lP: stormwater pond Peak Elev=728.20' Storage=33,894 ct l^llow=12.21 cfs 0.809 af Outflow=6.30 cfs 0.809 af Link 3L: offsite total lnflow=6.94 cfs 0.893 af Primary=6.94 cfs 0.893 af Total Runoff Area = 8.260 ac Runoff Volume = 0.893 af Average Runoff Depth = 1.30" 66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87" Prepared by {enter your company name here} Ptinled 112712022 HvdroCAD@ 10.00-25 s/n 00744 02019 HydroCAD Software Solutions LLC Paoe 12 Summary for Subcatchment 1S: pond drainage Runoff = 12.21 cls @ 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 yeat Rainlall=2.87" Area (ac) CN Description Tc Length(min) (feet) Slope Velocity Capacity Description(fuft) (tusec) (cfs) 6.6 0.9 -70 o.4 145 115 100 75 o.37 2.12 o.21 3.52 0.3300 0.0200 0.1000 0.0300 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Paved Kv= 20.3 fps 15.8 435 Total Subcatchment 1S: pond drainage Hyd.ograph ]! 13 12 1'l 10 I I 7 6 5 4 3 2 I 0 Ru -r-----+---t l tlI l R ri u miTc=15. o 2 4 6 A10 12 14 16 1A 20 22 24 26 2A 3n 32 34 36 3a 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72 Time (houB) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87" Prepared by {enter your company name here} Prinled 112712022 HvdroCAD@ 10.00-25 s/n 00744 O2019 HvdroCAD Software Solutions LLC Paqe 13 2.660 98 Paved parking, HSG C4.570 74 >75% Grass cover, Good, HSG C 7.230 4.570 2.660 83 Weighted Average 63.21% Pervious Area 36.79% lmpervious Area Ir il;;rril I ffii + I i-tr1 -rt-T--I I _t |-1H II ---f--r---l---t---a--- Summary for Subcatchment 25: Direct runoff Runoff = 1.4O 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 0.1 30 0.900 >75% Grass cover Good HSG C Paved parking, HSG C 1.030 0.900 0.1 30 77 Weighted Average 87.38% Pervious Area 12.62% lmpervious Area Tc Length(min) (fee0 Slope Velocity Capacity Description(fuft) (fUsec) (cfs) 10.3 1.9 100 0.0200 50 0.3300 Sheet Flow, Grass: Short Sheet Flow, Grass: Short n= 0.150 n= 0.150 P2= 2.87" P2= 2.87" 12.2 150 Total Subcatchment 25: Direct runoff Hydrograph ! Runofi ! Runoff Depth=0.98" Flow Length=150' Tc='12.2 min CN=77 Runoff Volume=0.084 af MSE 24-hr 3 2year Rainfall=2.87'! Runoff Area=l.030 ac 0 o 2 4 6 A 10 1214 16 18202224?62A303234 3a40 4244 46 48 s0 52 54 56 58 60 62 64 66 68 70 72 Tnie (hours) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 2 year Rainfall=2.87" Prepared by {enter your company name here} Ptinted 112712022 HvdroCAD@ '10.00-25 s/n 00744 O2019 HydroCAD Software Solutions LLC Paqe 14 OR 74 0. '16 0.43 1 Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ '10.00-25 sin 00744 @ 2019 HydroCAD Software Solutions LLC MSE 24-hr 3 2 year Rainfall=2.87" Printed 112712O22 Paqe 15 lnflow Area = lnflow Outflow Primary Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= '13,040 sf Storage= 24,288 d Peak Elev= 728.20' @ 12.46 hrs Surf.Area= 14,251 sf Storage= 33,894 cf Plug-Flow detention time= 339.1 min calculated for 0.251 af (31% of inflow) Center-of-Mass det. time= 38.6 min ( 858.7 - 820.1 ) Volume lnvert Avail.QlqAge 9loJage Description Summary for Pond lP: stormwater pond 7.23O ac, 36.79% lmpervious, lnflow Depth = 1.34" for 2 year event 12.21 ds @ 12.25 hrs, Volume= 0.809 af 6.30 cfs @ 12.46 hrs, Volume= 0.809 af, Atten= 48%, Lag= 13., ,'n 6.30 cfs @ 12.46 hrs, Volume= 0.809 af (9,606 cf above start) lnc.Store Cum.Store(cubic-feet) (cubic-feet) Elevation (feet) Surf.Area (sq-ft) Device Routing 0 4,464 6,960 12,8U 6,744 30,976 17,968 lnvert Outlet Devices 1,616 2,848 4.112 13,040 13,936 17,O40 18,896 0 4,464 11,424 24,288 31,032 62,008 79,976 #1 Primary 724.20'18.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 lnlet i Outlet lnveft= 724.20' I 723.95' S= 0.0100 '/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 4.0' long Sharp4rested Rectangular Weir 2 End Contraction(s) 18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 lnlet / Outlet lnvert= 725.50' / 725.50' S= 0.0000 '/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 #3 #4 Device 1 Device 2 727.50', 725.50'. Device 1 730.s0' rimary OutFlow Max=6.29 cfs @ 12.46 hrs HW=728.20' TW=0.00' (Dynamic Tailwater) =Culvert (Passes 6.29 cfs of 18.28 cfs potential flow) Sharp-Crested Rectangular Weir (Passes 6.29 cfs ol 7.44 cfs potential flow) ulvert (lnlet Controls 6.29 cfs @ 3.56 fps) rifice/Grate ( Controls 0.00 cfs) #1 722.00' 79,976 cf Gustom Stage Data (Prismatic) Listed below (Recalc) 722.OO 724.00 726.00 727.50 728.O0 730.00 731.00 Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 @ 2019 HydroCAD Software Solutions LLC MSE 24-hr 3 2 year Rainfall=2.87" Printed 112712022 Paoe 16 ' Pond 1P: stormwater pond Hydrograph 0 2 4 6 810121416 18202224262830 3234363840 4244464A505254 56 58 60 62 64 66 6a 70 72 Time (houE) 7 I lnflowI P.imaryI:l.t2 2 t-I lf llrElaIEI/:t , ICsrfoC l€3 3 t, o 4 (;f I- I III ilT tIIr rI 11 lnflow Area=7.230 ac +-T Elevation (feet) Surface (sq-ft) Storage (cubicJeet) Proposed RSI Marine site Chanhassen 23953 tilSE 24-hr 3 2 year Rainfall=2.87" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ '10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paoe 17 Stage-Area-Storage for Pond 1P: stormwater pond Elevation (feet) Surface Storage(sq-ft) (cubic-feet) 722.00 722.10 722.20 722.30 722.40 722.50 722.60 722.70 722.80 722.90 723.00 723.10 723.20 723.30 723.40 723.50 723.60 723.7 0 723.80 723.90 724.00 724.'tO 724.20 724.30 724.40 724.50 724.60 724.70 724.80 724.90 725.00 725.10 725.20 725.30 725.40 725.50 725.60 725.70 725.80 725.90 726.00 726.10 726.20 726.30 726.40 726.50 726.60 726.70 726.80 726.90 727 .00 727 .10 1,616 1,678 1 ,739 1,801 I ,OOZ 1,924 1,986 2,047 2,109 2,170 2,232 2,294 2,355 2,417 2,478 2,540 2,602 Z,bOJ 2,725 2,786 2,848 2,911 2,974 3,038 3,101 3,164 3,227 3,290 3,354 3,417 3,480 3,543 3,606 3,670 3,733 3,796 3,859 3,922 3,986 4,049 4,112 4,707 5,302 5,898 6,493 7,088 /,bd5 8,278 8,874 9,469 10,064 10,659 0.165 336 513 696 885 1,080 1 ,282 1 ,490 I ,704 1 ,924 2,150 2,383 2,621 2,866 3,',\17 3,374 3,637 3,907 4,182 4,464 4,752 5,046 5,347 5,654 5,967 6,287 6,612 6,945 7 ,283 7 ,628 7 ,979 8,337 8,700 I,O71 I,447 9,830 10,219 '10,614 11,016 11,424 1'1,865 12,365 12,925 13,545 14,224 14,963 '15,761 16,618 17,535 18,512 19,548 727 .20 727 .30 727 .40 727 .50 727 .60 727 .70 727 .80 727 .90 728.00 728.10 728.20 728.30 728.40 728.50 728.60 728.70 728.80 728.90 729.00 729.10 729.20 729.30 729.40 729.50 729.60 729.70 729.80 729.90 730.00 730.10 730.20 730 30 730.40 730.50 730.60 730.70 730.80 730.90 731.00 20,644 21 ,799 23,O14 24,288 25,601 26,932 28,281 29,647 31 ,032 32,433 33,850 35,283 36,731 38,194 39,673 41 ,167 42,677 44,203 45,744 47 ,301 48,873 50,460 52,063 s3,682 s5,316 56,966 58,631 60,312 62,008 63,721 65,453 67 ,204 68,972 70,760 72,566 74,391 76,234 78,096 79,976 11,254 1 1,850 12,445 13,040 13,219 13,398 '13,578 13,757 13,936 14,091 14,246 14,402 14,557 14,712 14,867 15,022 15,17I 15,333 15,488 15,643 15,798 15,954 16,'109 16,264 16,419 16,574 16,730 16,885 17 ,040 17 ,226 17 ,411 17,597 17 ,782 17,968 18,154 18,339 18,525 18,710 '18,896 Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} MSE 24-hr 3 2 year Rainfall=2.87" Ptinled 112712022 Paoe 1 8HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC lnflow Area = lnflow Primary Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Hydrograph 8.260 ac, 33.78% lmpervious, lnflow Depth = 1.30" for 2 year event 6.94 cfs @ 12.38 hrs, Volume= 0.893 af 6.94 cfs @ 12.38 hrs, Volume= 0.893 af, Atten= 0%, Lag= 9.6 , n I lniow! Pnmary t 7 6 5 3 2 0 2 4 6 810 12 141618202221 2A3O32U 3630a04244,1648 5052 54s65860 626466687072 Tlm. (hour!) @E Summary for Link 3L: offsite total 1 lnflow Area=8.260 ac i----l_-l ---+ t - % Z 2 Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Ptinled 112712022 HydroCADrO 10.00-25 s/n 00744 AzUg HydroCAD Software Solutions LLC Paqe 19 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Storlnd method Subcatchment 15: pond drainage Runoff Area=7.230 ac 36.79% lmpervious Runoff Depth=2.52" Flow Length=435' Tc=15.8 min CN=83 Runoff=22.99 cfs 1.520af Subcatchment 25: Direct runoff RunoffArea=1.030 ac 12.620/o lmpervious Runoff Depth=2.03" Flow Length=150' Tc=12.2 min CN=77 Runoff=2 .97 cls 0.174 aI Pond 1P: stormwater pond Peak Elev=728.95' Storage=44,917 cf lnflow=22.99 cfs 1.520af Outflow=g.03 cfs 1 .520 af Link 3L: offsite total lnflow=10.23 cfs 1.693 af Primary=19 23 cfs 1'693 af Total Runoff Area = 8.260 ac Runoff Volume = 1.693 af Average Runoff Depth = 2.46" 66.22% Pervious = 5.470 ac 33.78olo lmpervious = 2.790 ac Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 10.00-25 s/n 00744 02019 HfdroQAqsoft\ryeEsq&!!9llS LLC Paoe 20 Summary for Subcatchment'lS: pond drainage Runoff = 22.99 cls @ 12.24 hrs, Volume= '1.520 af , Depth= 2.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.0G72.00 hrs, dt= 0.0'l hrs MSE 24-hr 3 10 yeat Rainfall4.27" Area (ac) CN Description Tc (min) Length (feet) Slope Velocity Capacity Description(fuft) (fusec) (cfs) 6.6 0.9 7.9 o.4 145 115 100 75 0.3300 0.0200 0.1000 0.0300 0.37 2.12 0.21 3.52 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flou Paved Kv= 20.3 fps 25 24 22 21 20 19 18 17 15.8 435 Total Subcatchment 1S: pond drainage Hydrograph I Runoff 5 4 3 2 I 0I 8 7 6 5 4 3 2 1 0 GN=83 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 0 2 4 6 810 12 14 16 1A 20 22 24 X 2A 30 32 34 36 38 40 42 44 46 4A 50 52 54 56 58 60 62 64 66 68 70 72 Tlm€ (hou.!) 2.660 98 Paved parking, HSG C4.570 74 >75olo Grass cover. Good. HSG C 7.230 83 Weighted Average4.570 63.21% Pervious Area2.660 36.79% lmpervious Area '-9 ltrt t---f--T---a---t I _ffi J t1i t---t-I-i---l---]---- t -ffi -T.TTTTTTTTT Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} HydroCAD@ 10.00-25 s/n 00744 A zxg HydroCAD Software Solutions LLC MSE 24-hr 3 10 year Rainfall=4.27" Printed 112712022 Paqe 21 Summary for Subcatchment 25: 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 1.030 0.900 0130 Tc Length(min) (fee0 Slope Velocity Capacity Description(fuft) (fusec) (cfs) 10.3 1.9 0.16 0.43 100 50 0.0200 0.3300 Sheet Flow, Grass: Short Sheet Flow, Grass: Short n= 0.150 n= 0.150 P2= 2.87" P2= 2.87" 12.2 150 Total 3 2 '-9 MSE 24-hr 3 10 year Rainfal!=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 0 0 2 4 6 8 1012't1 16 18 20 22 24 26 28 30 32 U 36 38 40 42 ,14 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Tlm. (hours) 0.130 0 900 98 Paved parking, HSG C74 >75% Grass cover, Good, HSG C 77 Weighted Average 87.38% Pervious Area 12.62% lmpervious Area Subcatchment 25: Direct runoff Hydrograph li R,""til Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Ptinted 112712022 HvdroCAD@ 10,0Q-2E S/n QQ744 O2019 HydroCAD Software Solutions LLC Paae 22 Summary for Pond 1P: stormwater pond 7 .230 ac, 36.79% lmpervious, lnflow Depth = 2.52" for 10 year event 22.99 cfs @ 12.24 hrs, Volume= 1.520 af 9.03 cfs @ 12.53 hrs, Volume= 1.520 af, Atten= 6'l%, Lag= 17.1 , n 9.03 cfs @ 12.53 hrs, Volume= 1.520 al Routing by Dyn-Stor-lnd melhod, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 13,040 sf Storage= 24,288 d Peak Elev= 728.95' @ '12.53 hrs Surf.Area= 15,405 sf Storage= M,917 cl (20,629 cf above start) Plug-Flow detention time= 176.7 min calculated for 0.962 af (63% of inflow) Center-of-Mass det. time= 37.6 min ( 845.0 - 807.4 ) Volume lnvert Avail.Storage Storage Description #1 722.00',79,976 cf Custom Stage Data (Prismatic) Lisled below (Recalc) lnc.Store Cum.Store(cubic-feet) (cubic-feet) Elevation (feeo Surf.Area (sq-ft) 722.00 724.OO 726.00 727.50 728.00 730.00 731.00 Device Routinq 1,616 2,U8 4,112 13,040 13,936 17,O40 18,896 4,464 6,960 12,864 6,7M 30,976 17,968 0 4,4U 11,424 24,288 31,032 62,008 79,976 #1 Primary 724.20' 727.50' 725.50', Device 1 Device 2 18.0" Round Culvert L= 25.0' RCP, groove end poecting, Ke= 0.200 lnlet / Outlet lnveft= 724.20' I 723.95' S= 0.0100 '/ Cc= 0.900 n= 0.013, Flow Area= 1.77 sf 4.0' long Sharp4rested Rectangular Weir 2 End Contraction(s) 18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 lnlet / Outlet lnvert= 725.50' / 725.50' S= 0.0000 '/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 #3 #4 Device 1 730.50' frimary OutFlow Max=9.03 cfs @ 12.53 hrs HW=728.95' TW=0.00' (Dynamic Tailwaler)t-1=Culvert (Passes 9.03 cfs of 20.60 cfs potential flow) ?-?=Sharp'-crested Rectangular Weir (Passes 9.03 cfs of 21 .1 1 cfs potential flow) I t-3=Gulvert (lnlet Controls 9.03 cfs @ 5.1 1 fps) l-4=orifice/Grate ( Controls 0.00 cfs) lnflow Area = lnflow Outflow Primary lnvert Outlet Devices Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Prinled 112712O22 HydroCAD@ 10.00-25 s/n 00744 @2019 HydroCAD Software Solutions LLC Paqe 23 Pond 1P: stormwater pond Hydrograph '-9 0 2 4 6 A 101214 16 1A202224262A30 3234363840 4244464A505254 56 58 60 62 64 66 68 70 72 Time (hours) II lnrlow !! I lr rfl(,\V I \t e a r z 3 u a c {lFIeI ti )t I) )I)i' 'fCI-A A C I ,|., I \ ^ KI +T I r I ! l rltllrl:t!:lrlrli ij +_i l1 -l Elevation (feet) Su rface (sq-ft) Storage (cubic-feet) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ 10.00-25 s/n 00744 42019 HydroCAD Software Solutions LLC Paoe 24 Stage-Area-Storage for Pond 1P: stormwater pond Elevation (feet) Surface Storage(sqjt) (cubic-feet) 722.00 722.10 722.20 722.30 722.40 722.50 722.60 722.70 722.80 722.90 723.00 723.10 723.20 723.30 723.40 723.50 723.60 723.70 723.80 723.90 724.00 724.10 724.20 724.30 724.40 724.50 724.60 724.70 724.80 724.90 725.00 725.10 725.20 725.30 725.40 725.50 725.60 725.70 725.80 725.90 726.00 726.10 726.20 726.30 726.40 726.50 726.60 726.70 726.80 726.90 727 .00 727 .10 1,616 1,678 1,739 1,801 1,862 1,924 1,986 2,047 2,109 2,170 2,232 2,294 2,355 2,417 2,478 2,540 2,602 2,663 2,725 2,786 2,848 2,911 2,974 3,038 3,101 3,164 3,227 3,290 3,354 3,417 3,480 3,543 3,606 3,670 3,733 3,796 3,859 3,922 3,986 4,049 4,112 4,707 5,302 5,898 6,493 7,088 7,683 8,278 8,874 9,469 10,064 10,659 0 165 336 696 88s 1,080 1 ,282 1 ,490 1 ,704 1,924 2,150 2,383 2,621 2,866 3,117 3,374 3,637 3,907 4,182 4,464 4,752 5,046 5,347 5,654 s,967 6,287 6,612 6,945 7 ,283 7 ,628 7 ,979 8,337 8,700 9,071 I,447 9,830 10,219 10,614 11,016 11,424 11,865 12,365 12,925 13,545 14,224 14,963 't5,761 16,618 17,535 18,512 19,548 727.20 727 .30 727 .40 727 .50 727 .60 727 .70 727 .80 727 .90 728.00 728.10 728.20 728.30 728.40 728.50 728.60 728.70 728.80 728.90 729.00 729.10 729.20 729.30 729.40 729.50 729.60 729.7 0 729.80 729.90 730.00 730.10 730.20 730.30 730.40 730.50 730.60 730.70 730.80 730.90 731.00 11,254 1 1,850 12,445 13,040 13,219 13,398 13,578 13,757 13,936 14,091 14,246 14,402 14,557 14,712 14,867 15,O22 15,178 15,333 15,488 1 5,643 15,798 15,954 16,109 16,264 16,419 16,574 16,730 16,885 17 ,O40 17 ,226 17,411 17 ,597 17 ,782 17,968 18,154 18,339 18,710 18,896 20,644 21 ,799 23,O14 24,288 25,601 26,932 28,281 29,647 31,032 32,433 33,850 35,283 36,731 38, 'r 94 39,673 41 ,167 42,677 44,203 45,744 47 ,301 48,873 50,460 52,063 53,682 55,316 s6,966 58,631 60,312 62,008 63,72'l 65,453 67 ,204 68,972 70,760 72,566 74,391 76,234 78,096 79,976 Summary for Link 3L: offsite total lnflow Area = 8.260 ac, 33.78o/o lmpervious, lnflow Depth = 2.46" for 10 year eventlnflow = 10.23 cfs @ 12.30 hrs, Volume= 1.693 af Primary = 10.23 cfs @ 12.30 hrs, Volume= 1.693 af, Atten= 0%, Lag= 9.6 r'n Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Hydrograph I lnflowI Primary 11 '.9 I 7 6 5 4 0 2 4 6 8101214 16 1A2O221 2A3O 32 321 363840 12 11 46 1A 50 52 51 56 58 60 62 64 66 6a ?0 72 Tln|. (hou.!) lnflow Area=8.260 ac Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 10 year Rainfall=4.27" Prepared by {enter your company name here} Prinled 112712022 HydroCAD@ 10.00-25 s/n 00744 O 2019 HvdroCAD Software Solutions LLC Paoe 25 i tll Tro,3d;l Proposed RSI Marine site Chanhassen 23953 MSE 24'hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ 10.00-25 sln 00744 O20'19 HydroCAD Software Solutions LLC Paoe 26 Time span=0.0G72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-lnd method - Pond routing by Dyn-Stor-lnd method Subcatchment 15: pond drainage RunoffArea=7.230 ac 36.79Yo lmpervious Runoff Depth=5.39" Flow Length=435' Tc=15.8min CN=83 Runoff=47.98 cfs 3.246 af Subcatchment 25: Direct runoff Runoff Area=1.030 ac '12.620/o lmpervious Runoff Depth=4.71" Flow Length=150' Tc=12.2 min CN=77 RunofF6.84 cfs 0.404 af Pond'lP: stormwater pond Peak Elev=730.70' Storage=74,299 cf lnflow=47.98 cfs 3.246 af Outflolr,= 16.96 cfs 3.246 af Link 3L: offsite total lnflow=18.76 cfs 3.650 af Primary=18.76 cfs 3.650 af Total Runoff Area = 8.260 ac Runoff Volume = 3.650 af Average Runoff Depth = 5.30" 66.22% Pervious = 5.470 ac 33.78% lmpervious = 2.790 ac Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Printed 112712022 HydroCAD@ 1 0.00-25 s/n 00744 A 2019 HydroCAD Software Solutions LLC Paqe 27 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= 0.0G72.00 hrs, dt= 0.01 hrs MSE 24-hr 3 '100 year Rainfall=7.38" Area (ac) CN Description Paved parking, HSG C98 74 >757o Grass cover Good HSG C 7.230 4.570 2.660 Tc Length(min) (feet) 83 Weighted Average 63.21olo Pervious Area 36.79olo I mpervious Area Slope Velocity Capacity Description(fuft) (fusec) (cfs) 0.37 2.',12 0.21 3.52 Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Sheet Flow, Grass: Dense n= 0.240 P2= 2.87" Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 1S: pond drainage Hydrograph I Runoff E'o 3"u 20 50 45 40 35 10 0 MSE 24-hr 3 1 00 year Rainfall=7.38" Runoff Area=7.230 ac Runoff Volume=3.246 af Runoff Deplh=S.39" FIow Length=435' Tc=15.8 min CN=83 o 216 A 10 12 14 16 18 20222426 28 30 32 34 36 3A 40 42 44 46 48 s0 52 54 56 58 60 62 U 6 68 70 72 Tlme (houB) 2.660 4.570 6.6 0.9 7.9 o.4 145 0.3300 1 15 0.0200 100 0.1000 75 0.0300 15.8 435 Total l I Summary for Subcatchment 25: Direct runoff Runoff = 6.84 ds @ 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 98 74 >75% Grass cover Good HSG C Paved parking, HSG C 77 Weighted Average 87.38% Pervious Area 12.62% lmpervious Area Tc Length(min) (fee0 (fuft)(fusec) (cfs) Slope Velocity Capacity Description 10.3 1.9 100 0.0200 50 0.3300 0.16 0.43 Sheet Flow, Grass: Short Sheet Flow, Grass: Short n= 0.150 n= 0.150 P2= 2.87" P2= 2.87" 12.2 150 Total Subcatchment 25: Direct runoff Hydrograph I Runoff '-9 7 6 5 3 2 Runoff Area=1.030 ac Runoff Volume=0.404 af Runoff Depth=4.71" Flow Length=l5 Tc=12.2 min CN=77 MSE 24-hr 3 f 00 year Rainfall=7.38" 0 02468101214 16 ft 20 22 24 26 2A 30 32 U 6 * 40 42 44 46 t{J 50 52 54 55 58 60 62 64 66 68 70 72 Tlme (hourt) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Ptinled 112712022 HvdroCAD@ '10.00-25 s/n 00744 02019 HvdroCAD Software Solutions LLC Paoe 28 0.130 0.900 1.030 0.900 0. 130 Proposed RSI Marine site Chanhassen 23953 Prepared by {enter your company name here} MSE 24-hr 3 100 year Rainfall=7.38" Ptinted 112712022 H roCAD@ 10.00-25 sln 00744 O2019 H roCAD Software Solutions LLC Summary for Pond 1P: stormwater pond 7.23O ac, 36.79% lmpervious, lnflow Depth = 5.39" for '100 year event 47.98 cfs @ 12.24 hrs, Volume= 3.246 al 16.96 cfs @ 12.U hrs, Volume= 3.246 af , Atten= 65%, Lag= 16.2 , n 16.96 cfs @ 12.54 hrs, Volume= 3.246 al lnflow Area = lnflow Outflow Primary Routing by Dyn-Stor-lnd method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 727.50' Surf.Area= 13,040 sf Storage= 24,288 ct Peak Elev= 73O.7O'@ 12.54 hrs Surf.Area= 18,330 sf Storage= 74,299 ct (50,011cf above start) Plug-Flow detention time= 130.2 min calculated for 2.688 af (83% of inflow) Center-of-Mass det. time= 44.3 min ( 836.5 - 792.2 ) Volume lnvert Avail.Storaqe Storaqe Descri ption #1 722.00',79,976 ct Custom Stage Data (Prismatic) Listed below (Recalc) lnc.Store Cum.Store(cubic-feet) (cubic-feet) Elevation (feet) Surf.Area (sq-ft) 722.O0 724.00 726.O0 727.50 728.OO 730.00 731.00 Device Routing lnvert Outlet Devices 1 ,616 2,U8 4,112 13,040 13,936 17.U0 18,896 0 4,4U 6,960 12,864 6.744 30,976 17,968 0 4AU 11,424 24,288 3',t,032 62,008 79,976 #1 Primary 724.20',18.0" Round Culvert L= 25.0' RCP, groove end projecting, Ke= 0.200 lnlet / Outlet lnverl= 724.20' 1 723.95' S= 0.01 00'/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 18.0" Round Culvert L= 30.0' RCP, mitered to conform to fill, Ke= 0.700 lnlet / Outlet lnvert= 725.50' 1725.50' S= 0.0000'/ Cc= 0.900 n= 0.013, Flow Area= 1 .77 sf 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 #3 Device 1 Device 2 727.50', 725.50' #4 Device 1 730.50', rimary OutFlow Max=16.96 ds@12.U hrs HW=730.69' TW=0.00' (Dynamic Tailwater) =Culvert (Passes '16.96 cfs ol 25.23 cfs potential flow) =Sharp-Crested Rectangular Weir (Passes 13.42 cls of 62.76 cfs potential flow) =Culvert (lnlet Controls 13.42 cfs @ 7.59 fps) rifice/Grate (Weir Controls 3.54 cfs @ 1.44 fW) Proposed RSI Marine site Ghanhassen 23953 Prepared by {enter your company name here} MSE 24-hr 3 100 year Rainfall=7.38" Prinled 112712022 Paoe 30HydroCAD@ 10.00-25 s/n O 2019 HvdroCAD Software Solutions LLC '-9E o 2 4 6 I 10 12 14 16 14202221 Pond 1P: stormwater pond Hydrograph 28 30 32 34 36 3a 40 42 4 I 1A fi 52 51 56 58 60 82 64 6 A 70 72 llrro (houB) Int I e I Z tt at!tl l(,l v \t d' JIEaKlIE ,t I n , ,u v (!I t c I C l€I 4 I, - II lIIrIIIIIIlfltilflIIlil1 a IlllllI1ililII llltIIIlllllflltIIIIl ltr I lnfowI Primaryffi t -// f'616ds Elevation (feet) Su rface (sq-ft) Storage (cubic-feet) Elevation (feet) Su rface Storagesq-ft) (cubic-feet) 722.00 722.10 722.20 722.30 722.40 722.50 722.60 722.70 722.80 722.90 723.00 723.10 723.20 723.30 723.40 723.50 723.60 723.70 723.80 723.90 724.00 724.10 724.20 724.30 724.40 724.50 724.60 724.70 724.80 724.90 725.00 725.10 725.20 725.30 725.40 725.50 725.60 725.70 725.80 725.90 726.00 726.10 726.20 726.30 726.40 726.50 726.60 726.70 726.80 726.90 727 .00 727 .10 1,616 1,678 1 ,739 1,801 1 ,862 1 ,924 1,986 2,047 2,109 2,170 2,232 2,294 2,355 2,417 2,478 2,U0 2,602 2,663 2,725 2,786 2,848 2,911 2,974 3,038 3,101 3,164 3,227 3,290 3,3s4 3,417 3,480 3,543 3,606 3,670 3,733 3,796 3,859 3,922 3,986 4,049 4,112 4,707 5,302 5,898 6,493 7,088 7,683 8,278 I,874 9,469 10,064 10,659 727 .20 727 .30 727 .40 727 .50 727 .60 727.70 727 .80 727 .90 728.00 728.10 728.20 728.30 728.40 728.50 728 60 728.70 728.80 728.90 729.00 729.10 729.20 729.30 729.40 729.50 729.60 729.70 729.80 729.90 730.00 730.10 730.20 730.30 730.40 730.50 730.60 730.70 730.80 730.90 731.00 11,254 1 1,850 12,445 13,040 13,219 13,398 13,578 13,757 't 3,936 14,091 14,246 14,402 14,557 14,712 14,867 15,022 't5,178 15,333 '15,488 15,643 15,798 15,954 16,109 16,264 '16,419 16,57 4 16,730 16,885 17 ,040 17 ,226 17,411 17,597 17,782 17,968 18,154 18,339 18,525 18,710 18,896 20,u4 21,799 23,014 24,288 25,601 26,932 28.281 29,647 31 ,032 32,433 33,850 35,283 36,731 38,194 39,673 41,167 42.677 44.203 45,744 47 ,301 48,873 50,460 52,063 53,682 55,3'16 s6,966 58,631 60,312 62,008 63,721 65,453 67 ,204 68,972 70,760 72,566 74.391 76,234 78,096 79,976 Proposed RSI Marine site Chanhassen 23953 tlSE 24-hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Ptinted 112712022 HvdroCAD@ 10.00-25 s/n 00744 020'19 HvdroCAD Software Solutions LLC Paqe 31 Stage-Area-Storage for Pond 1P: stormwater pond 0 165 336 513 696 885 1,080 1,282 'I ,490 I ,704 1 ,924 2,',150 2,383 2,621 2,866 3,117 3,374 3,637 3,907 4,182 4AU 4,752 5,046 5,U7 5,654 5,967 6,287 6,612 6,945 7 ,283 7 ,628 7 ,979 8,337 8,700 9,071 9,447 9,830 10,219 10,614 11,016 11,424 1 1,865 12,365 't2,925 13,545 14,224 14,963 15,761 16,618 17,535 18,512 19,548 Primary outflow = lnflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 3L: offsite total Hydrograph 21 20 19 t8 17 16 15 11 13 i12 l, 11 er0E9 I 7 6 5 I 3 2 1 0 ! lnfowI Pnmary 0 2 4 6 8 t0 12 14 16 1A202224 2A30 32 34 36 38 40 42 4 4 14 50 52 54 56 5860626,{ 66 68 70 72 Timo (houB) Proposed RSI Marine site Chanhassen 23953 MSE 24-hr 3 100 year Rainfall=7.38" Prepared by {enter your company name here} Printed 112712022 HvdroCAD@ 10.00-25 s/n 00744 02019 HvdroCAD Software Solutions LLC Paoe 32 Summary for Link 3L: offsite total lnflow Area = 8.260 ac, 33.78o/o lmpervious, lnflow Depth = 5.30" for 100 year eventlnflow = 18.76 cts @ 12.52 hrs, Volume= 3.650 af Primary = 18.76 cfs @ '12.52 hrs, Volume= 3.650 af, Atten= 0%, Lag= g.g , n --r--r-t rlrrlrrr uf 1 + I 1 l lnflow Area=8-260 rTr-T-TrrTrTr + ffi T-rT r-r-1 #tttl I I t ac it,j 1 'ul z A m % t'B;6-cr'