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1. Deep spring water.

2. Subterranean or deep well water.

3. Upland surface water.

4. Subsoil water. (If distant from any collection of houses).

5. Land springs.

6. River water.

7. Surface water from cultivated land.

8. Subsoil water under villages or towns.

Surface water from a bazaar is classified as sullage.

FIG. 9.

Where tanks are used as a source of drinking water-supply, they should be properly fenced and conserved, and the water drawn by a pump. Recent researches have proved that polluted water, if stored in a tank or reservoir where it can be preserved from subsequent contamination, rapidly becomes pure. The Type plan, approved by the Sanitary Board of Behar and Orissa, is shown in Fig. 9, page ssss1. This for an existing tank of 100 yards square area is estimated to cost Rs. 2,700. The pumps, provided in duplicate, are Kite double action pattern and cost about Rs. 425 each. The fencing provided is the Ideal Woven wire fence, 10 strands, 48″ high, and can be fixed at about 12 annas per yard.