Water Availability of water is the most important factor in determining what plants grow and their productivity in a given area.
Trees transpire much more.
The trenches are closed at each end. The rows and trenches have to be made with precision and slope slightly from one end to the other. Water is poured in through pipes at the upper end of each trench and flows to the lower end. Small holes at end of tubes or along hoses let water leave tubes or hoses. Excess water drains to wetland pond through tiles, then water can be pumped back into tiles to irrigate.