New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 373 - DESIGN STANDARDS FOR NON-COMMUNITY WATER SYSTEMS
Section Env-Ws 373.08 - Design Flow

Universal Citation: NH Admin Rules Env-Ws 373.08

Current through Register No. 13, March 27, 2025

(a) Subject to (b), below, anticipated design flows for a proposed non-community water system, based on the type of use, shall beas determined in Table 373-1 below:

Table 373-1

Anticipated Design Flows

Type of Use Design Flow
Institutions other than hospitals 135 gpdper bed
Golf Club 20 gpdper locker
Bed & Breakfast 60 gpdper bedroom
Shopping center/stores 5 gpdper 100 square feet (sq.ft.)
Hospitals 200 gpdper bed
Campground with 3-way hook-up 90 gpdper site
Campground with central comfort station 75 gpdper site
Motel/Hotel 50 gpdper person, calculated at 4 persons per room
School with gym and cafeteria 25 gpdper student
Factory -sanitary use only 20 gpdper worker
Restaurant 40 gpdper seat
Lounge 20 gpdper seat
Office space 15 gpdper person or 15 gpd/100 sq. ft.

(b) If the specific type of use is not listed above, the design flow shall be determined in accordance with Env-Ws 1008.

(c) For non-community water systems that are being expanded or upgraded, the design flow shall be determined either in accordance with (a) and (b), above, or by using historical water readings in accordance with one of the following:

(1) By finding the daily average flow from water meter readings and multiplying the average by a minimum factor of 2 or a maximum factor of 3 depending on the type or frequency of the meter readings; or

(2) By examining 12 months of consecutive daily water meter readings, in which case, the water system's design flow shall be based on the highest daily flow noted, without application of a multiplying factor.

(d) Since the design flows contained in Table 373-1 and Env-Ws 1008 do not include exterior water use, for those water systems where watering lawns and gardens, filling swimming pools, or other high water use demands are expected, the total design flow for the water system shall be increased accordingly.

(See Revision Note at chapter heading for Env-Ws 300); ss by #8499, eff 11-30-05

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