MR.
ABDUL AZEEZ AL MUHANNADI
–PRIVATE VILLA
Water Supply Calculation
Domestic Cold water system:
General Description:
Domestic water supply will be obtained from the main city water network and stored in
POLYETHYLENE storage tank to be located at ground floor.
Water will be pumped from storage tank to a roof water tank through transfer water
pumps. From this roof water tank, water will be distributed for all building facilities by
means of gravity except for the upper three floors which requires booster pump set to
achieve the proper water head at these levels.
Basis of Design
Design for cold water pipes is based upon diversified load for fixtures used
intermittently on the system.
Pipe sizes will be determined by the fixture unit method. The weight in fixtures
units is tabulated below in accordance with National Plumbing Code Handbook:
Fixture Type Fixture Unit
Water Closet-Public Flush Tank 5
Water Closet-Private Flush Tank 3
Lavatory-Public 2
Lavatory-Private 1
Urinal-Flush Valve 5
Urinal-Flush Tank 3
Bidet 2
Drinking Fountain 2
Restaurant Kitchen Sink 4
Kitchen Sink 2
Public Shower Head 4
Private Shower Head 2
Hose Bib 3
Laundry (dish washer or washing machine) 2
Determination of demand and usage will follow the recommendations of the
National Plumbing Code Handbook.
System will be designed so as to ensure a minimum residual pressure of 20 meter
of water.
Storage water Tanks:
Residential water demand:
According to uniform plumbing code, at office building
Assume 2 person for each bedroom
No of person=12
According to uniform plumbing code, water demand = 270 liter/ person/day
Total residential water demand = (12)X270= 3.24 m3/day
Use 1 water tank at the roof =1500 gallon(storage 1day)
Diameter=1.97m ,hight=2.60m
GYM demand:
Assume No of person=12
Total residential water demand = (12)X50= 0.60 m3/day
Use 1 water tank at the roof floor =400 gallon(storage 1day)
Diameter=1.25m ,hight=1.33m
Out.Kit demand:
Use 1 water tank at the roof floor =400 gallon(storage 1day)
Diameter=1.25m ,hight=1.33m
Driver Quarter:
According to uniform plumbing code, at office building
Assume 2 person for each bedroom
No of person=6
According to uniform plumbing code, water demand = 270 liter/ person/day
Total residential water demand = (6)X270= 1.62 m3/day
Use 1 water tank at the roof floor =400 gallon(storage 1day)
Diameter=1.25m ,hight=1.33m
Transfer water pumps:
Roof water tank is to be filled in 1Hours
Q=volume / time = 11.73/1 = 11.73 m3/Hr = 3 L/sec
Use two transfer water pumps each of capacity = 3 L/sec (one is stand by)
Static head = 10m (from drawings)
Friction losses = 20% of static head = 10*0.2 = 2 m
Total pumps head = 10+2 = 12m take it =20 m
Booster pump set calculations: (for VILLA)
Booster pump set will serve all villa Total fixture units for these floors is calculated in
the table below
Floors Total fixtures
Fixtures F.U T.F.U
villa NO
E.W.C 9 9 3 27
LAV. 9 9 1 9
SH 8 8 2 16
K.S 0 0 2 12
B.T 2 2 2 4
Total fixture units for main villa 70
Total fixture units = 70
Total Discharge = 37GPM
Discharge of one pump = 2.30 L/sec
Booster pump set calculations: (for Out.Kit)
Booster pump set will serve all villa Total fixture units for these floors is calculated in the table below
Floors Total fixtures
Fixtures F.U T.F.U
Out.kit NO
K.S 1 1 2 2
Total fixture units for main villa 2
Total fixture units = 2
Total Discharge = 2GPM
Discharge of one pump = 0.50 L/sec
Booster pump set calculations: (for driver quarter)
Booster pump set will serve all villa Total fixture units for these floors is calculated in the table below
Floors Total fixtures
Fixtures F.U T.F.U
villa NO
E.W.C 2 2 3 6
LAV. 2 2 1 2
B.T 2 2 2 4
Total fixture units for main villa 12
Total fixture units = 12
Total Discharge = 10 GPM
Discharge of one pump = 0.63 L/sec
Booster pump set calculations: (for GYM)
Booster pump set will serve all villa Total fixture units for these floors is calculated in the table below
Floors Total fixtures
Fixtures F.U T.F.U
villa NO
E.W.C 1 1 3 3
LAV. 1 1 1 1
SH 1 1 2 2
Total fixture units for main villa 6
Total fixture units = 6
Total Discharge = 7 GPM
Discharge of one pump = 0.50 L/sec
Booster pump set calculations: (for MAGLIS)
Booster pump set will serve all villa Total fixture units for these floors is calculated in the table below
Floors Total fixtures
Fixtures F.U T.F.U
villa NO
E.W.C 1 1 5 5
LAV. 4 1 2 8
KS 1 1 4 1
Total fixture units 14
Total fixture units = 14
Total Discharge = 11 GPM
Discharge of one pump = 0.80 L/sec
Use GRP water tanks at BASEMENT FLOOR =20 M3(storage 2days)
Diameter(4.1X1.8X2.70)
Domestic Hot water system:
General Description
-Domestic Hot Water will be supplied to gym,out kit ,maglis and driver quarter
will be generated through individual water heaters located at toilets or any
facility requiring hot water.
-Domestic Hot Water will be supplied to Main Villa by central water heater
