Orange County NC Website
Browse       Search
export amounts to 3.61bs/ac /yr. <br />(2) Pay a one -time offset payment -e€ 3304h. This offset <br />fee will go to the `xledaBds Rester- do Program OAW) <br />North Carolina Ecosystem Enhancement Program <br />(NCEEP). The )AW NCEEP will utilize these fees in <br />accordance with the Basinwide Wetlands and Riparian <br />Restoration plans. It is the policy of the WRP NCEEP to <br />utilize the funds where they are generated to the maximum <br />extent possible. <br />(3) A combination of BMPs and offset payments may be <br />used to achieve 3.6 lbs /ac /yr. <br />b) If the calculated export is greater than 10.0 lbs /ac /yr, the owner <br />must use BMPs to lower the nitrogen export to 10.0 lbs /ac /yr. The <br />owner may then use one of the above options to achieve a nitrogen <br />export level of 3.61bs /ac /yr. <br />D. Calculating Peak Runoff Volume <br />For all new development, there shall be no net increase in peak flow leaving the <br />site from the predevelopment conditions for the 1 year, 24 hour storm. <br />1. The following are acceptable methodologies for computing the pre - <br />and post- development conditions for the 1 year, 24 hour storm. <br />a) Rational Method <br />b) Peak Discharge Method as described in the USDA Soil <br />Conservation Service's Technical Release Number 55 (TR -55). <br />c) Putnam Method <br />d) Alternative methods must be approved by the County and the <br />EMC <br />2. The same method must be used for both the pre- and post - <br />development conditions. <br />3. Raleigh Rainfall Depths <br />a) 1 year, 24 hour depth: 3.00 inches <br />b) 1 year, 24 hour intensity: under development by DWQ staff <br />E. Exemptions to the Peak Flow Requirements <br />Peak flow requirements are waived for development that meets the following <br />criteria: <br />1. Increase in peak flow between pre- and post- development conditions <br />does not exceed 10% (ten percent). <br />2. Proposed new development meets all of the following criteria: <br />a) total impervious surface is less than 15% (fifteen percent), and <br />b) remaining pervious surface maximizes stormwater runoff <br />control and conveyance. <br />3. Detention will cause further flooding on lands that have experience <br />5 <br />