This figure shows that rice has a propotion of irrigation water reqirement more than cassava at 923 cubic meters in average. Burirum is the rice cultivating area which has the highest irrigation water requirement at 964 cubic meters, followed by Amnart Charoen at 950 cubic meters, and Ubon Ratchathani and Sisaket at 929 cubic meters. However, cassava has the propotion of irrigation water requirement at 259 cubic meters. Burirum has the highest irrigation water requirement at 291 cubic meters, followed by Amnart Charoen at 290 cubic meters, and Maha Sarakham at 263 cubic meters respectively.