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Virginia Administrative Code
Title 12. Health
Agency 5. Department Of Health
Chapter 590. Waterworks Regulations
11/25/2020

12VAC5-590-690. Capacity of waterworks.

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.

Statutory Authority

§§ 32.1-12 and 32.1-170 of the Code of Virginia.

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.

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