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Virginia Administrative Code (Last Updated: January 10, 2017) |
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Title 12. Health |
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Agency 5. Department of Health |
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Chapter 590. Waterworks Regulations |
Section 690. Capacity of waterworks
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The design capacity of the waterworks shall exceed the maximum daily water demand of the system. Waterworks shall normally be designed on the following basis of water consumption. If deviations are made, they shall be based on sound engineering knowledge substantiated in the designer's report and approved by the division.
A. Daily water consumption rates (annual daily water demand):
Dwellings, per person
100 gpd
High schools with showers, per person
16 gpd
Elementary schools without showers, per person
10 gpd
Boarding schools, per person
75 gpd
Motels at 65 gallons per person, minimum per room
130 gpd
Trailer courts at three persons per trailer, per trailer
300 gpd
Restaurants, per seat
50 gpd
Interstate or through highway restaurants, per seat
180 gpd
Interstate rest areas, per person
5 gpd
Service stations, per vehicle served
10 gpd
Factories, per person, per eight-hour shift
15-35 gpd
Shopping centers, per 1,000 sq.ft. of ultimate floor space
200-300 gpd
Hospitals, per bed
300 gpd
Nursing homes, per bed
200 gpd
Home for the aged, per bed
100 gpd
Doctor's office in medical center
500 gpd
Laundromats, 9 to 12# machines, per machine
500 gpd
Community colleges per student and faculty member
15 gpd
Swimming pools, per swimmer
10 gpd
Theaters, drive-in type, per car
5 gpd
Theaters, auditorium type, per seat
5 gpd
Picnic areas, per person
5 gpd
Camps, resort, day and night with limited plumbing, per camp site
50 gpd
Picnic areas, per person
5 gpd
Luxury Camps with flush toilets, per camp site
100 gpd
B. Minimum acceptable effective finished water storage for human consumption shall not be less than 200 gallons per equivalent residential connection at minimum pressure.
C. All waterworks shall provide at least a minimum working (under flow) pressure of 20 psi at the service connection based on the greater of maximum hour or maximum day plus applicable fire flows. Applicable fire flows shall be selected by coordination between the water supply owner, design consultant, local officials and local fire marshal. When the number of residential units is less than 1,000, the formula Q=11.4N0.544; is acceptable for estimating maximum hour domestic demand flow, where Q=total gallons per minute and N=total number of residential units. The division can require a higher design pressure if indicated by site conditions.
D. A waterworks utilizing wells as the sole source of supply shall provide source capacity of a minimum of 0.5 gallons per minute per equivalent residential connection.
E. Waterworks serving 50 or more residential connections with wells as the source of supply shall provide at least two water sources that do not hydraulically interfere with another source of public water supply. Consideration shall be given to requiring each source to be of a minimum yield so its reliability is realistic. The secondary well should be rated at 20% of the waterworks capacity as a minimum.
F. Waterworks serving less than 50 residential connections with wells as the source of supply shall provide or have access to an auxiliary pump stored or stocked locally or they shall provide 48 hours of total effective storage volume based on water usage.
Historical Notes
Derived from VR355-18-007.06 § 3.6, eff. August 1, 1991; amended, Volume 09, Issue 17, eff. June 23, 1993; Volume 31, Issue 01, eff. October 10, 2014.