This is the alternate given on page 12-12 of the DENR Manual.Capital Improvement Projects listed and described in the 2004 Stormwater Plan have either been completed or included in the 2010 Stormwater Capital Improvement Plan.
Stormwater Management performance criteria establish the design objectives for Stormwater BMPs. The applicable regulations are listed in Table I-1 below and the requirements are compared in Tables I-2 and I-3. Additional State requirements apply to projects that impact wetlands, streams, stream buffers, or floodplains. In addition to implementing the new development and re-development rules as stated in 15A NCAC 02B.0271, the University will meet the existing development requirements of the Jordan Lake Rules by requiring additional treatment at redevelopment sites. The nutrient requirements listed below reflect UNC Policy to Implement the Jordan Lake Rules. There may be exceptions for sites in unincorporated Orange or Chatham Counties that meet the State definition for Low Density Development and do not meet require Diffuse Flow Plans. Treatment shall be designed according to the design standards listed in the subsequent section. Designers must use the calculation method approved by the State DWQ. As of the publishing of these guidelines, the Tar Pam Piedmont Worksheet is the approved method. The post-construction nutrient exports will be compared to the baseline (December 31, 2001) nutrient exports for that site. A 35 reduction of TN and 5 reduction of TP must be demonstrated based on the calculation method approved by the State DWQ. ![]() ![]() For sites where runoff discharges to multiple outlets from the UNC property, analysis must be conducted for each outlet. For example, if a site partly discharges to Battle Branch and partly to the Town of Chapel Hill storm drainage system along Franklin Street, at least two design points are required. The calculations will be based on the SCS (NRCS) Methodology. The calculations must be based on a method acceptable to the Town and UNC. All stormwater management practices constructed at UNC must follow the NCDENR Best Management Practices Manual, as amended by the DENR, the Town of Chapel Hill, and UNC. Stormwater Pipe Design Manual Are AcceptableBMPs shown in the NCDENR manual are acceptable unless otherwise noted. The UNC Stormwater Engineer may require changes to the design to improve safety, provide maintenance access, or control maintenance costs. This testing shall follow the testing requirements given on page 16-7 of the DENR Manual (Section 16.3.5 In-Situ Soil Requirements). Analysis by a geotechnical or structural engineer may be required.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |