Stormwater Management Report
South Hope Chapel Rd. Subdivision
Project #23184
In calculating stormwater runoff using the NRCS methodology, the appropriate 24-hour rainfall depths as developed for the parcel by the National Oceanic and Atmospheric Administration shall be utilized.
The Ocean County 24-hour rainfall depths provided in the NJDEP BMP Manual Chapter 5 have been utilized which have been developed from NOAA Atlas 14.
Runoff shall meet the requirements at N.J.A.C. 7:8-5.6 and (a) 6iii(1) and (2) below:
Runoff will meet the stormwater runoff quantity standards of N.J.A.C. 7:8-5.6 by meeting peak rate reductions per of N.J.A.C. 7:8-5.6(b)3. for each point of analysis as outlined below:
Design stormwater management measures so that the post-construction peak runoff rates for the current and projected two-, 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 pre-construction 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.
| PEAK RUNOFF COMPARISON – CURRENT ADJUSTED (CFS) |
| POA | Allowable | Proposed |
|---|
| 2-Year |
| 1 | 0.39 | 0.0 |
| 2 | 0.06 | 0.0 |
| 3 | 0.0 | 0.0 |
| 10-Year |
| 1 | 1.17 | 0.0 |
| 2 | 0.23 | 0.0 |
| 3 | 0.0 | 0.0 |
| 100-Year |
| 1 | 2.75 | 0.0 |
| 2 | 1.09 | 0.10 |
| 3 | 0.14 | 0.07 |
| PEAK RUNOFF COMPARISON – FUTURE ADJUSTED (CFS) |
| POA | Allowable | Proposed |
| 2-Year |
| 1 | 0.51 | 0.0 |
| 2 | 0.08 | 0.0 |
| 3 | 0.0 | 0.0 |
| 10-Year |
| 1 | 1.49 | 0.0 |
| 2 | 0.38 | 0.0 |
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