SS Tanks

Summer Storage Tanks (SS Tank)

Need for Summer Storage Tank (SS Tank):

  • When the source of drinking water supply scheme is a river, tributary, major stream, and the flows in the river/ tributary/ major stream dwindle as the summer season approaches and there will be no water flowing in it during the summer periods ;
  • Is an irrigation canal, and the canal will be closed after kharif or rabi season depending upon the contemplation of the irrigation project / scheme is for a single crop (kharif) or two crops for both kharif and rabi seasons. In both the cases, water cannot be tapped from the canal during the closure period every year.
  • The above situations demand the need for planning of a summer storage tank to augment the drinking water supplies during the summer periods.

Selection of site for summer storage tanks (SS Tank):

  • location as well as storage capacity to minimize the high cost involved for the construction of summer storage tank
  • If there are no existing tanks suitable, the location of the proposed summer storage tank should be such that the total cost involved should be as minimum as possible. Various alternative sites are to be studied to evolve an economical proposition.
  • The site should not be of pervious strata like gravelly and sandy soils where the percolation losses are heavy.
  • The strata should be suitable for founding earth bunds over it.
  • if existing tank is selected for summer storage, the rehabilitation of the system should be economical.
  • If the source of the entire scheme is an existing reservoir, the intake well may be located where dead storage is maximum so that water can be drawn not only from live storage but also from dead storage.

Capacity of the summer storage tank (SS Tank):

The capacity of the summer storage tank includes

  • The total quantity of water required for drinking and domestic purposes for the entire period of canal closure or the period of non-availability of water in the natural flowing source.
  • Evaporation losses due to impounding of the water for the entire period of storage.
  • Percolation losses in the impounding area.

TYPE DESIGNS FOR SMALL EARTHEN DAMS

Type designs for tank bund sections for various heights are enclosed for adoption as shown below. Importance is given for power roller consolidation of bund upto Top of Bund level (TBL), providing revetment ,upto TBL providing 3 m. top width and having 0.15 m. thick rolled gravel pathway at TBL. This is with a view to provide sufficient safety during times of Cyclones, heavy rains, etc., and also will facilitate maintenance of TBL at a later date.

SECTION 0.00 MTS TO 3.40 MTS (SS Tank)

SECTION 3.50 MTS TO 7.40 MTS (SS Tank)

SECTION 7.50 MTS TO 10.40 MTS (SS Tank)

SECTION 10.50 MTS TO 16.00 MTS (SS Tank)

The above drawings were got approved by Sri. T. HANUMANTHA RAO, Chief Engineer, Minor Irrigation. 

OPERATIONAL MANUAL on Andhra Pradesh Community Based Tank Management Project

MANUAL

 

Note: The above Model Drawings are provided for educational Purposes Only.

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