This study investigates cropping system options in relation to irrigation water scarcity by improving water allocation in an attempt to maximize Net Economic Return (NER) and calorific production. Crop Water Requirement (CWR) and Irrigation Water Requirement (IWR) are estimated for common crops in a case study base in the Hari Rod river basin of Afghanisatn using the CROPWAT model. The current field situation considering water availability and farmer agricultural management practices is quantified in term of demand and supply of water, and compared to actual crop water requirement....