New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1000 - SUBDIVISIONS; INDIVIDUAL SEWAGE DISPOSAL SYSTEMS
Part Env-Wq 1018 - BEDS AND TRENCHES
Section Env-Wq 1018.05 - Size of Effluent Disposal Area for Trench Systems
Universal Citation: NH Admin Rules Env-Wq 1018.05
Current through Register No. 13, March 27, 2025
(a) Sidewall surfaces in trench systems shall be used in calculating the EDA only if the septic tank outlet is at a higher elevation than the top of the EDA.
(b) The effective EDA for trenches shall be calculated as twice the effective sidewall surface added to the width, multiplied by the length and then multiplied by the number of trenches, as shown in the following equation:
{trench length x [trench width + (trench depth x 2)] } x number of trenches
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08
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