problem 1. (25 points)

A subdivision located in Middlesex County, New Jersey has a drainage area of 20 acres, the pre-development curve number of 80, and the pre-development time of concentration of 15 minutes.

The post-development curve number is 92, and the post-development time of concentration is 5 minutes.

Calculate the runoff depths, runoff volumes and runoff peak flow rates for the 100-year, 24-hour storm under both the pre- and post-development conditions.

According to the State of New Jerseys stormwater management rule, what the post-development peak flow rate should be reduced to by using one or more stormwater Best Management Practices (stormwater control measures)? (1 square mile = 640 acres, 1 acre = 43,560 square ft.)