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Domestic Water Usage Factors (Return to Index)

Flush water closet:                     1 to 5 gallons

Shower:                                    10 to 25 gallons

Operate dishwasher:                  12 to 15 gallons

Wash load of clothes:                20 to 50 gallons

Assumptions

  1. Highest usage rate at awakening-- normally a 1 to 2 hour period in morning.
  2. Each person takes a shower and flushes the water closet twice; total 15 to 35 gallons/person.
  3. Each household washes a load of dishes and clothing, 35 to 65 gallons.
  4. Two people per bedroom.
  5. Assume a 30 to 40 gallon storage tank.

Domestic Water Required (2-hour period)

1 Bedroom/2 people                           2 Bedroom/4 people                    3 Bedroom/6 people

70 gal                                            140 gal                                                210 gal
+ Basic       65 gal                                +Basic    65 gal                                    +Basic   
65 gal
Total          135 gal                                Total     205 gal                                    Total     275 gal
-Storage      40 gal                                -Storage  40 gal                                    -Storage 
40 gal
                  95 gal                                             165 gal                                                 235 gal

Flow Rate 1 ½ gal/min                    Flow Rate 3 gal/min                              Flow Rate 4 gal/min

 

4 Bedroom /8 people                          5 Bedroom/10 people

280 gal                                       350 gal
+Basic         65 gal                         +Basic    
65 gal
Total           345 gal                          Total      415 gal
-Storage       40 gal                         -Storage 
40 gal
                  305 gal                                       375 gal

Flow Rate 5 gal/min                              Flow Rate 6 gal/min

 

 


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