2026 02 12 Crestmont CC and Eagle Rock Ave Stormwater Management Report

Crestmont Country Club Eagle Rock Ave Improvements Langan Project #10104802 Township of West Orange, NJ DRAINAGE SUBAREA RUNOFF COEFFICIENT CALCULATIONS EXISTING CONDITIONS STORMWATER CONVEYANCE CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE IMPROVEMENTS LANGAN PROJECT #10104802 PROPOSED CONVEYANCE SYSTEM SUB- OPEN SPACE OPEN SPACE WOODS WOODS GRAVEL IMPERVIOUS TOTAL TOTAL RUNOFF DRAINAGE HSGC C HSGC D HSGC C HSGC D HSGC C AREA AREA AREA COEFFICIENT STRUCTURE AREA C = 0.51 C = 0.65 C = 0.45 C = 0.59 C = 0.84 C = 0.99 C TYPE (SF) (SF) (SF) (SF) (SF) (SF) (SF) (AC) (Weighted) NETWORK 1 EX-CB1-2 46,220 16,005 2,062 2,630 0 21,788 88,705 2.04 0.65 GRATE INLET EX-CB1-3 0 0 0 0 17,450 17,450 0.40 0.99 GRATE INLET NOTES: 1. Runoff coefficients are referenced from Table 10.3-B: Recommended Coefficient of Runoff Values for Various Selected Land Uses from Section 10 of the 2015 New Jersey

GRATE INLET NOTES: 1. Runoff coefficients are referenced from Table 10.3-B: Recommended Coefficient of Runoff Values for Various Selected Land Uses from Section 10 of the 2015 New Jersey Department of Transportation (NJDOT) Roadway Design Manual. \\langan.com\data\PAR\data8\101049801\Project Data\_Discipline\Site Civil\Stormwater\Eagle Rock Inlet Runoff Coefficient Calculations