# Definition of Average water consumption or Design flow

Thursday, February 16, 2012 17:50**Average Water consumption or Design flow:**

It is the amount of water consumed in a community or city for various purposes. It is generally expressed as the ” Quantity of water per person in one day on the average.”

Mathematically

**Average Daily Per Capita Demand
= Quantity Required in 12 Months/ (365 x Population) **

Its units are lpcd, gpcd or m3pcd.

**Maximum daily water consumption :**

It is the maximum amount of water used in one day throughout the year.

Maximum daily water consumption or demand is calculated as follows:

**Maximum daily water consumption =
1.8 × Average daily demand
**

**Peak hourly water consumption :**

It is the maximum amount of water consumed in one hour of maximum day during any month of year.

Peak hourly water consumption.

= 1.5 x average hourly demand

= 1.5 x Maximum daily demand/24

= 1.5 x (1.8 x average daily demand)/24

= 2.7 x average daily demand/24

= 2.7 x annual average hourly demand