In order to design a network of irrigation channels, it is necessary to determine cropping pattern and Hydro-Module of area. Then according to the water requirement (Hydro-Module), flow through each irrigation channels is calculated. In this study, after being informed from cropping pattern of Vanaei Village located at Eslam Abad Gharb in Iran (query from local farmers and using NETWAT software), by using CROPWAT software, Hydro-Module determined for this village. Finally, results compared with AGWAT software. The amounts of calculated Hydro-Module using CROPWAT software and AGWAT software were 0.78 and 0.73 liter per second in each hectare, respectively.