CEA-CA SERIES

TECHNICAL APPENDIX
WATER REQUIREMENTS IN CIVIL USERS
Water requirements in condominiums
The first operation that is necessary for sizing a booster set is determining the quantity of water and the
pressure it has to supply.
The table at page 28 shows maximum water consumption values for each delivery point, depending on the
plumbing amenities.
The maximum theoretical requirement is given by the sum of the water consumption values of each delivery
point. In actual fact, the delivery points are never used all together; only a few of them are used.
Therefore, it is extremely important to determine the maximum number of delivery points that are more likely
to be used at the same time.
The first step is establishing the value of the contemporaneity factor, which depends on the number of delivery
points.
Values have been calculated with the following formulas:
- Apartments with one bathroom
- Apartments with two bathrooms
f = 1/ (0.643 x Nr x Na) 1/2 x 1.05 with flush tank WC
f = 1/ (0.857 x Nr x Na) 1/2 x 1 with controlled flushing system WC
f = 1/ (0.545 x Nr x Na) 1/2 x 1.03 with flush tank WC
f = 1/ (0.727 x Nr x Na) 1/2 x 0.8 with controlled flushing system WC
where
Nr = number of delivery points
Na = number of apartments
The table at page 29 shows the maximum contemporaneity flow-rate values for apartments with one or two
bathrooms provided with flush tank WC or controlled flushing system WC. As regards apartments with one
bathroom, 7 drawing points have been taken into consideration, while 11 points have been considered for
apartments with two bathrooms.
Water requirements for community buildings
The requirements of buildings intended for specific uses, such as hospitals, hotels, offices, boarding schools,
residential hotels, department stores, are different from those of condominiums, and both their global daily
water consumption and the maximum contemporaneity flow rate are usually greater.
The diagram at page 28 shows the requirements of a few communities, for guidance.
These requirements must be determined case by case, with the utmost accuracy, according to particular needs
and local provisions.
25