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Environmental Engineering - Planning For Water Supply System

Flowchart of the sources of clean drinking water

   Posted On :  03.07.2016 12:24 pm
Flowchart of the sources of clean drinking water

SOURCES OF FRESH WATER: Flowchart of the sources of clean drinking water

Flowchart of the sources of clean drinking water


SOURCES OF FRESH WATER


 

The quantity of water required for a community depends upon:

 

1.     Forecasted population

2.     Types and variation in demand (e.g. seasonal variation)

3.     Maximum demand (Per day/Per month)

4.     Fire demand

5.     Rural demand and supplies

6.     Appropriate / Available technology

 

Main sources of water are

 

1.     Surface water sources: Lakes impounding reservoirs, streams, seas, irrigation canals

2.     Ground water sources: Springs, wells, infiltration wells

 

Factors affecting the use of water

 

Size of the city

Industry and commerce

Climate

Time of the day

Day of the week or month



ESTIMATION OF WATER DEMAND

While estimating the water demand, the above factors should be considered e.g. the size of the city; its population does matter when estimating the water demand. The more the size of population, more will be the demand. Estimation of water demand is necessary to:

 

1.     Calculate design flow

2.     Determine the pumping power of machines to be used

3.     Reservoir capacity

4.     Pipe capacity

 

1. Average daily water consumption: It is based on complete one year supply of water. It is the total consumption during one year, divided by the population. q = (Q / P x 365) lpcd (liters per capita per day)

 

2. Maximum daily consumption: It is the maximum amount of water used during one day in the year. This amount is 180% of the average daily consumption MDC = 1.8 x Avg. daily consumption. It is usually a working day (Monday) of summer season.

3. Maximum weekly demand: The amount of water used by a population during a whole single week in a study span of 1 year.


4. Fire water demand | Fire Demand: Theamount of water usedfor fire fighting is termed as fire demand. Although, the amount of water used in fire fighting is a negligible part of the combine uses of water but the rate of flow and the volume required  may  be  so  high  during  fire  that  it  is  a  deciding  factor  for  pumps, reservoirs And distribution mains.


Tags : Environmental Engineering - Planning For Water Supply System
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