A PROCEDURE FOR ROTATION IRRIGATION IN LOWLAND RICE

A rotation method among irrigation groups has been implemented to coun ter water-shortage problem. However, the conventional rotation irrigat ion method lacks a procedure for practical implementation of water dis tribution to mitigate effects of the water shortage. In this study a r otational method of irrigation is proposed using a parameter which is defined as a ratio between effective water supply and effective water demand and also designated as a K-factor to provide a stepwise procedu re for water distribution method that can take into account the presen ce of variable sources of water supply. The irrigation area of the Chu ng-tan working station located at the Kaohsiung Irrigation Association in Taiwan was used as an example to demonstrate the practical applica tion of the K-factor. The results showed that using the developed K-fa ctor as an index of water distribution is an expedient means and stepw ise procedure to achieve a water distribution scheme for varying water supplies. (C) 1997 Elsevier Science B.V.