Section Env-Wq 1504.10 - Calculation of Water Quality Volume (WQV)Water quality volume (WQV) shall be calculated using the Unified Sizing Criteria as follows:
(a) "P" means one inch of rainfall;(b) "A" means the total area draining to the design structure;(c) "I" means the percent impervious area draining to the design structure, in decimal form;(d) "Rv" means the unit-less runoff coefficient calculated as the sum of 0.05 plus the product of I multiplied by 0.9, as in the formula below: Rv = 0.05 + (0.9 x I)
(e) To calculate the WQV, the applicant shall multiply the product of Rv and A by P, as shown in the formula below: WQV = P x A x Rv
N.H. Admin. Code § Env-Wq 1504.10
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09; (See Revision Note #2 at chapter heading for Env-Wq 1500) renumbered by #9817-A (formerly Env-Wq 1504.09)
Amended by Volume XXXVII Number 32, Filed August 10, 2017, Proposed by #12342, Effective 8/15/2017, Expires 8/15/2027.