1. SERVIcERESERVOIR IN WATER DISTRIBUTION

3. Elevated Reservoir and

5. To maintain the desired minimum residual pressure in the distribution system.

6. To provide the required time for the disinfectant added in order to achieve effective disinfection. And

8. Ladders to reach the top of the reservoir and then upto the bottom of the reservoir for inspection. Manholes for providing entry into the tank for inspection purpose. Ventilator for freh air circulation

9. Surface Reservoirs Surface reservoirs are circular or rectangular tanks constructed at ground level or below gronund level. Therefore they also called as ground reservoirs. They are generally constructed at high points in the city. In a gravitational type of distributional system. And pumping system used for treated water is filled the reservoir s.

11. They are constructed in the areas combined gravity and pumping system for water distribution is adopted.

12. Water pumped into these elevated tanks from the filter units or from the service reservoirs.

13. And then supplied to consumers.

15. Storage Capacity The total storage capacity of a distribution reservoir is the summation of : Balancing storage (equalizing/operating storage) Break-down storage And Fire storage Balancing storage : The main and primary function of the distribution reservoir is to meet the fluctuating demand with a constant rate of supply from the treatment plant.The quantity of water required to be stored in the reservoir for equalizing or balancing this variable demand against the constant supply.

16. Break-down storage : It also called as emergency storage. It is the storage preserved in order to tide over the emergencies posed by the failure of pumps, electricity, or any other mechanism drinving the pump. Fire storage : The third component of the total reservoir storage. In case of fires sufficient amount of water must remain available in thereservoir for throwing it over the fire.

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