North Carolina Administrative Code (Last Updated: November 13, 2014) |
TITLE 15A. ENVIRONMENT AND NATURAL RESOURCES |
CHAPTER 18. ENVIRONMENTAL HEALTH |
SUBCHAPTER C. WATER SUPPLIES |
15A NCAC 18C .0703. MECHANICAL FLOCCULATION
Latest version.
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(a) Basin Inlet and Outlet. The design of inlets and outlets of flocculation basins shall prevent short circuiting of the water and destruction or deterioration of the floc.
(b) Detention Period. The flocculation basins shall have a theoretical detention period of not less than 20 minutes.
(c) Agitator Control. The agitators of flocculation basins shall be equipped with variable speed controls.
(d) Paddles. Peripheral speed and paddle configuration shall be designed to obtain optimum velocity gradient.
History Note: Authority G.S. 130A‑315; 130A‑317; P.L. 93‑523;
Eff. January 1, 1977;
Readopted Eff. December 5, 1977;
Amended Eff. July 1, 1994.