“For irrigation purposes, especially for fresh vegetable cash crop production in water deficit areas, water is collected in ponds from springs or small streams. The ponds are lined and sealed with sheet membranes (200 g/m2 fibre-reinforced plastic sheets, Silpaulin). The sheets are water proof; less affected by earth-movements, affordable for small farmers and can be easily repaired in case of small tears. However the sheets are photosensitive and tend to become brittle when directly exposed to the sun, especially when ponds are empty or filled with less water.
