15A NCAC 02H .1006. STORMWATER REQUIREMENTS: HIGH QUALITY WATERS

All development activities which require a stormwater management permit under Rule .1003 of this Section and are within one mile of and draining to waters classified as High Quality Waters (HQW) shall manage stormwater runoff in accordance with the provisions outlined in this Rule.  More stringent stormwater management measures may be required on a case‑by‑case basis where it is determined that additional measures are required to protect water quality and maintain existing and anticipated uses of these waters.

(1)           All waters classified as WS‑I or WS‑II (15A NCAC 2B .0212 and .0214) and all waters located in the coastal counties (Rule .1005 of this Section) are excluded from the requirements of this Rule since they already have requirements for stormwater management.

(2)           Low Density Option:  Development shall be permitted pursuant to Rule .1003(c)(1) of this Section if the development has:

(a)           built‑upon area of 12 percent or less or proposes single family residential development on lots of one acre or greater;

(b)           stormwater runoff transported primarily by vegetated conveyances; conveyance system shall not include a discrete stormwater collection system as defined in Rule .1002 of this Section;

(c)           a 30 foot wide vegetative buffer.

(3)           High Density Option:  Higher density developments shall be permitted pursuant to Rule .1003(c)(2) of this Section if stormwater control systems meet the following criteria:

(a)           control systems must be wet detention ponds or alternative stormwater management systems designed in accordance with Rule .1008 of this Section;

(b)           control systems must be designed to control runoff from all surfaces generated by one inch of rainfall.

 

History Note:        Authority G.S. 143‑214.1; 143‑214.7; 143‑215.1; 143‑215.3(a);

Eff. September 1, 1995;

Amended Eff. December 1, 1995.