is particularly high during transplanting period from late april to may when water resources are least available the large seasonal variation in demand has forced development of integrated central management systems these not only built with computers and tele communication equipments but runoff measurement estimation watershed accurate reservoir storage mea surement short long term prediction delivery efficiency real time monitoring devices for distribution also needed one prerequisite setting up system canal modernization beginning irrigation uppermost priority was put on expansion facilities such as construction reservoirs canals hydraulic structures aged were damaged rural multi functions supply domestic livestock industrial environmental area however new very difficult dams costly land price right complicated addition envi ronmental problems associated resource cause serious
