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Underground tank

1,310 bytes added, 18:05, 13 April 2012
→‎Construction, operations and maintenance
==Construction, operations and maintenance==
Basic water quality testing Consider five main factors when designing your underground tank.'''1. Seepage'''It is very important to store rainwater and not to lose it! The tank should have a durable, watertight, opaque exterior and a clean, smooth interior. Below ground tanks must also be plastered well and correctly installed, otherwise they can collapse.'''2. Evaporation'''All storage tanks should have a roof made from locally available materials. A tight fitting top cover prevents evaporation, mosquito breeding and keeps insects, rodents, birds and children out of the tank. A suitable overflow outlet(s) and access for cleaning are also important.'''3. Length of the dry spell'''This is recommended during important in determining the size and number of tanks to be constructed. The longer the dry spells the first yearmore water you would need. Sometimes sophisticated calculations are involved, with further testing when but these tend not to take into account human behaviour and the willingness to use water quality if it is available and not to conserve it for future use, in doubtthe hope that the dry spell will soon be over. E'''4.g. the Daily usage''HACH' pillo test, costing about US$ 1 per testThis is related to the above factor but ensure that the crops are hardened to withstand some stress during the dry spell. Treatment Determine how much area you would want to manage microbiological quality is also recommendedsave in case of a very long dry spell lasting more than three weeks. 
====Maintenance====
* Removal of debris and overhanging vegetation from gutters and the roof (preventing stagnation of water in the gutters) is required. Physical inspection and repairing cracks with cement is also needed.
* Basic water quality testing is recommended during the first year, with further testing when water quality is in doubt. E.g. the 'HACH' pillo test, costing about US$ 1 per test. Treatment to manage microbiological quality is also recommended.
==Costs==
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