System Sizing Tables - by Nelsen Corporation

The following information lists estimated water usage for various establishments. Remember that these are only estimates.

Type of Establishment	Gallons/Day
Airports (per passenger)	5-Mar
Apartments, Multi Family (per resident)	60
Camps:
Construction, semipermanent (per worker)	50
Day with no meals served (per camper)	15
Resorts, day and night with limited plumbing (per camper)	50
Tourist with central bath and toilet facilities (per person)	35
Cottages with seasonal occupancy (per resident)	20
Country Clubs (per non-resident member)	25
Dwellings:
Boarding houses (per boarder)	50
Luxury ( per person)	100-150
Multiple family apartments (per resident)	40
Rooming houses (per resident)	60
Single family (per resident)	50-75
Factories (gal per person per shift)	15-35
Hotels with private baths (two persons/room)	60
Hotels without private baths (per person)	50
Hospitals (per bed)	250-400
Laundries, self-service (gallons/washing/customer)	50
Motel with bath, toilet and kitchen (per bed space)	50
Motels with bed and toilet - no kitchen (per bed space)	40
Parks:
Overnight with flush toilets (per camper)	25
Trailers with individual bath units (per camper)	50
Picnic Areas:
With bath houses, showers and flush toilets (per picnicker)	20
With toilet facilities only (gallon/picnicker)	10
Restaurants with toilet facilities (per patron)	10-Jul
Restaurants with bars and cocktail lounge (add per person)	2
Schools:
Boarding (per person)	75-100
Day with cafeteria, gymnasium and showers (per pupil)	25
Day without cafeteria, gymnasium or shower (per pupil)	15
Service stations (per vehicle)	10
Stores (per toilet room)	400
Swimming pools (per swimmer)	10
Theaters: Indoor or Drive-In (per auditorium seat/car space)	5
Workers: Construction (per person/shift)	50
Workers: Office (per person/shift)	15

Source - Adapted from U.S. Public Health Service, 1962 Manual of Individual Water Supplies

To use this chart, determine if the fixtures are open to the public or are for private use. Multiply the actual number of fixtures by the weighted value listed in the chart below. Take the total value to the following page.

Fixture	Occupancy	Type	Cold Value	Hot Value	Total Value
Water closet	Public	Flush valve	10	-	10
Water closet	Public	Flush tank	5	-	5
Urinal	Public	1" valve	10	-	10
Urinal	Public	3/4" valve	5	-	5
Lavatory	Public	Faucet	1.5	1.5	2
Bathtub	Public	Faucet	3	3	4
Shower	Public	Mixing valve	3	3	4
Service sink	Public	Faucet	2.25	2.25	3
Kitchen sink	Public	Faucet	3	3	4
Drinking fountain	Restaurant	Valve	0.25	-	0.25
Dish machine	Public	Valve	-	1	1
Laundry machine	Public	8#	2.25	2.25	3
Laundry machine	Private	16#	3	3	4
Water closet	Private	Flush valve	6	-	6
Water closet	Private	Flush tank	3	-	3
Lavatory	Private	Faucet	0.75	0.75	1
Bathtub	Private	Faucet	1.5	1.5	2
Shower stall	Private	Mixing valve	1.5	1.5	2
Kitchen sink	Private	Faucet	1.5	1.5	2
Laundry	Sink private	Faucet	2.25	2.25	3
Dishwasher	Private	Automatic	-	1	1
Clothes washer	Private	8#	1.5	1.5	2

		Apartments and Mobile Home Parks
Units	All soft	Peak Flow	Hot Only	Hot Peak Flow
4	720	22	240	12
5	900	25	300	15
6	1,000	30	360	20
8	1,440	40	480	26
10	1,800	50	600	30
15	2,700	75	900	45
20	3,600	90	1,200	45
30	5,400	110	1,800	65
40	7,200	125	2,400	75
50	9,000	140	3,000	85
100	18,000	220	6,000	110