Kan. Admin. Regs. § 5-40-32

Current through Register Vol. 43, No. 40, October 3, 2024

Section 5-40-32 - Determination of rainfall excess

(a) Rainfall excess shall be determined by using the natural resource conservation service (NRCS) runoff curve number method.

(b) The antecedent moisture condition (AMC) to be used when determining the curve number for the design storm shall be one of the following:

(1) For zone one, the curve number determined using AMC III;

(2) for zone two, the curve number determined by averaging the AMC II and AMC III curve numbers; or

(3) for zone three, the curve number determined using AMC II.

Zone one, zone two, and zone three shall have the meanings specified in K.A.R. 5-40-1 under the definition of a "stream."

(c) If the drainage basin is in two zones, the curve number may be weighted based on the drainage area within each zone.

(d) AMC II shall be used in determining the rainfallrunoff relationship used to compute the required detention storage.

Kan. Admin. Regs. § 5-40-32

Authorized by and implementing K.S.A. 2006 Supp. 82a-303a; effective May 18, 2007.