One way to get around this situation is to understand the water use of crop during growth, as this period demands maximum input. With this information, the contribution/influence of energy crops on water resources can be understood. Water requirements of a plant species can be calculated by estimating the minimum amount of water per hectare yield (or water limited yield), which is based on the potential yield of the crop species and the availability of water. Water use of plants (evapotranspiration) is dependent on the plant species. Evergreen plants, such as coconut have high evaporation rates and thus high evapotranspiration, thereby increasing the potential of ground water depletion. The local conditions like the climate, amount of rainfall, solar radiation, relative humidity, etc, also influence the ground water depletion potential to a great degree. .
