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EMAS cistern

38 bytes removed, 22:09, 20 May 2013

→‎Construction, operations and maintenance

Water can be directly pumped out of the cistern using an EMAS pump.

# Dig a large hole in the ground, with a diameter of 0.8m for the 1st meter, so that the cover does not need to be very large. # Below that increase the diameter to 1.40-1.80m and round it off so the bottom is ballshaped. The cistern is on average 3-4m deep, but can be made deeper if necessary. Then # Install the inlet pipe is installed. Then # Install a foundation of mud and stones about 30cm deep is , built around the cistern, and built build up about 30cm above the ground. This is covered # Cover in mortar or cement to waterproof it. # About 10cm above the ground, another outlet pipe is set, for if the cistern becomes too full. This should be covered # Cover with a net to prevent insects from entering the tank. Then # Cover the walls of the cistern are covered in mud cakes, and 2 layers of cement white wash. The walls should not be too thick or they will crack.  Then the # Build an arch -shaped cover is built, by laying lying cement on a mold of mud hill covered in plastic. The thickness of the cover depends on the diameter. A 1m wide cover should be about 5cm thick. A # Place a short guide pipe is placed at the centre of the cover. Then # Install the EMAS pump is installed. Its pipe is set in a larger stiff guide pipe, which reaches down to the bottom of the cistern and is fixed in place using cement. The # Cover the guide pipe is covered with a waterproof stopper. Use a knife to perforate this with a small hole for water.

====Maintenance====

The cistern needs to be cleaned regularly, particularly if it is being used for flocculation and sediments collect at the bottom. This can be done by removing the pump from the guide pipe and placing it loosely in the tank. Then all the sediments can be pumped up from the entire bottom of the tank.

==Costs==

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