2022 08 Drainage Report

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STORMWATER COLLECTION SYSTEM CALCULATIONS (PIPE SIZING)

DYNAMIC ENGINEERING Stormwater Collection System Calculations Project: Residential Subaision ‘Computed By: RAW Job #: 4266-90-00 Checked By: RPF Location: West Orange Township Date: 67472022 Design Storm: 25-¥e NOTES: 1) Design method used is Rational Method, unless otherwise noted. 2) Refer to Weighted Runoff Coefficient rable for ealeulation of incremental areas and C values SUBCATCHMENT TIME OF PIPE SECTION ‘AREA INCREMENTAL CUMULATIVE] CONCENTRATION ' PEAK RUNOFF PIPING INPUT. PIPING DATA. eto | tein [paral eum Pie | Five row 10 acattees | ret | axcae | averse | tna | roe [Fe coin [2] Serge Bi | con | vy (min) } (min) (CFS) ce) | (es) ESTE TEA as TH 305 Too] asi] —Ta00| — 68a] asa 034] — 15] esa] Ooo] 00s] a5] a0 Basin FES 008 08 ‘08 Taal — ai] 1000] — sol 0a 0.54] 15] 2saa]-a012] oor 5.85] 4.9 Basin im 010 095 [ 010 am Ta.0al — «71 1000] — «sol 04s — 0.68] 15] a00a]-a012] 0.0035] a4] 3.39 ME TSC 000 1a95-[—a00 a0 Tao] —aaal—11e7l— «sal 000] — 0.6615] — 200| 0.12] 0.0050] 405] a

OVERFLOW SPILLWAY CALCULATIONS

q DYNAMIC ENGINEERING Overflow Spillway Calculations Project: Residential Subdivision Job #: 4266-99-001 Location: West Orange Township Computed By: RMW Checked By: RPF Date: 8/5/2022 BIORETENTION BASIN A To Size Spillway: . Assume complete blockage of the outlet control structure and no infiltration . Route 2 ,10 & 100 year storm through basin assuming that the basin is filled with water up to the Emergency Spillway Elevation 2 Year 40 Year 100 Year |Spillway Width (ft. illway Elevation (ft. Flow through Spil |Water Surface Elevation (ft) Depth of Flow (ft) 0.09) [Area of Flow (A) (sf)* 0.94 Velocity (V) = Q/ A (ft/sec) 0.83 4.03 1.29 &V = < 2.0FPS & Stability Achieved

q DYNAMIC ENGINEERING Overflow Spillway Calculations Project: Residential Subdivision Job #: 4266-99-001 Location: West Orange Township Computed By: RMW Checked By: RPF Date: 8/5/2022 BIORETENTION BASIN B. To Size Spillway: . Assume complete blockage of the outlet control structure and no infiltration . Route 2 ,10 & 100 year storm through basin assuming that the basin is filled with water up to the Emergency Spillway Elevation 2 Year 10 Year 100 Year Spillway Width (ft. ‘Spillway Elevation (ft, Flow through Spillway (Q) (cfs. Water Surface Elevation (ft) Depth of Flow (ft) 0.14 0.18 0.29] ‘Area of Flow (A) (sf)" 4.14 4.83] 2.98) Velocity (V)=Q/A (ft/sec) 0.82 1.05 1.38 #&V = < 2.0FPS & Stability Achieved

q DYNAMIC ENGINEERING Overflow Spillway Calculations Project: Residential Subdivision Job #: 4266-99-001 Location: West Orange Township Computed By: RMW Checked By: RPF Date: 8/5/2022 BIORETENTION BASIN C To Size Spillway: . Assume complete blockage of the outlet control structure and no infiltration . Route 2 ,10 & 100 year storm through basin assuming that the basin is filled with water up to the Emergency Spillway Elevation 2 Year 10 Year 100 Year Spillway Width (ft.) Spillway Elevation (ft. Flow through Spillway (Q) (cfs \Water Surface Elevation (ft) Depth of Flow (ft) [Area of Flow (A) (sf) Velocity (V)=Q/A (fU’sec) 0.81 1.04 1.36 &V = < 2.0FPS & Stability Achieved