WATER SUPPLY AND SANITARY OBJECTIVE GUIDE

• The vertical wells provided along the banks of a river to draw ground water in dry season are called infiltration wells.
• When in the pervious strata, the surface of the water surrounding the well is at atmospheric pressure the well is known as gravity well.
• An artesian spring is formed when a porous strata gets enclosed between two impervius strata.
• The quantity of water avialable from infiltration gallery depends upon the size of gallery, nature of soil and yield of source.
• The portio of soil through which lateral movement of water takes place is called zone of saturation.
• The growth of population may be conveniently represented by Logistic Curve. 
• The yield of underground source may be obtained by pumping and recupating test. 
• The water mains should be designed for 225% of the average daily water requirements.
• Turbidity of water is expressed in terms of silica scale.
• The maximum permissible color for the domestic supplies on paltinum cobalt scale is 10 -20 ppm.
• The maximum permissible turbidity for domestic supplies on silica scale is 5-10 ppm. 
• The maximum permissible chloride content should not exceed 250 ppm.
• Total solid content 500 ppm.
• Maximum Ph value of water will occur at 0.
• The most common causes of acidity is Carbon dioxide.