The
first step in construction is to build the barrier dike at the
top of your valley. This dike will raise the water level up-valley
so that it can run down a supply canal above the ponds (right).
When water isn't needed , the flow is diverted into a drain canal
which passes below the level of the bottom of the ponds (left).
It is into this drain canal that ponds are drained at the time
of harvest. Through proper management of water using supply and
drain canals, a farmer can fill and drain all ponds without the
use of a pump, thus relying entirely on local materials.
A.
Barrier Dike
B.
Supply Canal
C.
Drain Canal
D.
Water backed up-valley
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