Report 4 13 2026

​ENSURPLAN, INC.​ ​ ww.Ensurplan.​​net​ w ​ ivil Engineers & Land Surveyors C Ph: (732) 469-0400​ ​Certificate of Authorization 24GA27997700​ ​STORMWATER DRAINAGE REPORT​ ​04/13/26​ ​Minor Subdivision 15 Ridgeway Ave West Orange, NJ​ ​Stormwater Analysis​ ​Stormwater Quantity​ ​Requirements​ ​ o comply with the Major Stormwater regulations quantity control restrictions, stormwater​ T ​management measures shall be designed so that the post-construction peak runoff rates for the​ ​current and projected 2-, 10 and 100 year storm events, as defined and determined pursuant to​ ​N.J.A.C. 7:8-5.7(c) and (d), respectively, are 50, 75 and 80 percent, respectively, of the​ ​preconstruction peak runoff rates. The percentages apply only to the post-construction​ ​stormwater runoff that is attributable to the portion of the site on which the proposed​ ​development or project is to be constructed.​ ​Design Methodology/Discussion​ ​ he runoff rates from the existing condition were determined. The runoff rates from the​ T ​proposed conditions were determined. A study point is modeled at the existing inlet to the rear​ ​of the site at which all runoff from the studied area is collected. A comparison to the pre​ ​construction and post construction rates along with the maximum allowed reduced rates follows.​ ​Current Intensity Storm​ ​Pre Construction​​Rate​ ​Maximum​ ​Post Construction Rate​ ​2 Year Storm 0.38 cfs 0.19 cfs 0.19 cfs​ ​10 Year Storm 0.95 cfs 0.71 cfs 0.66 cfs​ ​100 Year Storm 2.26 cfs 1.81 cfs 1.80 cfs​ ​8​ ​Mailing Address: Post

s 1.80 cfs​ ​8​ ​Mailing Address: Post Office Box 4304, Warren, NJ 07059​