Irrigation projects are commonly found in areas of low and unreliable rainfall. This is because irrigation is the process of supplying water to crops in order to help them grow. If an area receives low and unreliable rainfall, the crops may not receive enough water to grow properly, which can lead to poor yields or crop failure. Irrigation helps to supplement the natural rainfall and ensures that crops have access to the water they need to grow. Therefore, areas with low and unreliable rainfall are more likely to have irrigation projects in order to support agriculture.