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Natural or artificial ground catchment and Lined sub-surface tanks

1 byte added, 22:38, 5 April 2012

→‎Construction, operations and maintenance

* In Somaliland it cost between $39 - $43 per m3 of storage for a new berked and $8 per per m3 for a rehabilitated berked, excluding about 30-45% of local contribution (e.g. 493m3 new berked = $19,550; rehabilitated existing berked = 4,000 USD). In India, stone masonry sub-surface tanks cost $28 per m3 of storage (35m3 tank cost $990). <br>

* Floor to be made from concrete which needs to be laid with vibration in order to be sure they are leak-proof.

* In clay areas, be sure to build the tank robustly enough to resist cracking. Sample dimensions & mixtures for walls and floor for stone masonry tanks in an area of swelling clay are: ''# Walls'': 0.4m wide, 2 blocks thick. ''# Floor leveling mixture'': 0.05m thick, ratio 1:4:6 (not used in rehabilitated berkeds as level floor foundation already exists). ''# Floor'': 0.16m thick, unreinforced concrete, ratio 1:21⁄2:4.<br>

'''Bricks/cement''':

* In Kenya, brick/cement tanks cost $37 per m of storage (21m3 tank cost $780).

Winona

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