Water-tank ('box') design for gravity-feed water system - HELP
Hi. After many years of utilizing an old, multi-household gravity-feed system, I've convinced enough of my neighbors to do something about replacing it. The old concrete tank (we call them "boxes" in this part of N. America) is too small and the concrete has deteriorated on the inside so that too much silt adheres and we're getting bacterial and worm problems in the water.
The system is basically this: A concrete basin in a small creek withdraws water. A buried pipe conducts the water from the basin downhill for about 150 metres, where it feeds a 600-gallon concrete tank. The tank has a settling compartment to allow silt to settle out, and then also four distribution compartments, each of which has a gate valve and a pipe that heads downhill to the various homesteads.
The 600 gallon tank is too small, because at low-flow time (July to realy September) it refills too slowly in relation to the need for water by the homesteads. Yet even in the dry period water is overflowing this tank during the night, when there is no use of the water.
We're thinking of increasing the "buffer" (distribution-tank capacity) to at least 2400 gallons. Larger would be better in a way, except the available spots in the steep forestland area would not very well accommodate the location and construction of a huge tank.
So our need is for a good design that is large enough, easy to clean, and can equitably distribute water to four individual outflow pipes.
Anyone know of a good Web site, book, or set of mail-order plans? The more plans we find, the better we can make design decisions through comparison. Thanks.