The rainwater-storage tanks were made of concrete casing pipe which were inexpensive cost and local availability. Two concrete cylinder tanks (0.95 m3 capacity, 1x1.2 m each), 1.9 m3 for 2 cylinders were used for each sub-plot,drip irrigation is running down slope under gravitational force.
In addition, a rainwater collecting plate with diameter of 1.4 m made from a zinc lid with a
shape of a funnel having many small holes in the middle part. These holes were made to filter
foreign matters and to allow the rainwater flowing through the cement tank.