Changes

Repairing water tanks

8 bytes added, 20:04, 24 May 2012

→‎Construction, operations and maintenance

====Leakage through a cracked foundation====

[[Image:weld mesh.jpg|thumb|right|150px|Weld mesh cut to fit foundation. Photo: © E. Nissen-Petersen, Kenya.]]

'''Problem:''' Water leaks through cracks in the foundation.<br>'''Reason:''' Soft soil under the foundation, insufficient reinforcement, poor mixture of concrete or improper curing.<br>

'''Remedy:''' The leakage can be sealed by constructing a new foundation onto the old cracked foundation.

'''Step 3:''' Cut sheets of weld mesh to fit the foundation. All overlaps must be at least 20 cm and tied together with binding wire for every 10 cm.

'''Step 4:''' Mix concrete with 1 part cement to 3 parts river sand and 3 parts of crushed stones (1:3:3). Compact a 7 cm thick layer of concrete onto the old foundation. '''Step 5:''' Lay the weld mesh on the concrete in the tank.

'''Step 6:''' Compact a second layer of 7 cm concrete onto the weld mesh in the tank.

Winona

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