An Automatic Water Management System for Large-Scale Rice Paddy Fields

An automatic water management system for large-scale paddy fields has been developed. The purposes of that are to supply the paddy fields with water or drain water from that automatically, to decrease water consumption, and to have a good harvest. To accomplish the above purpose, developed system has five functions, (1) prediction of paddy growth stages, (2) water level control corresponding to growth stages, (3) estimation of mean water level, (4) prediction of water consumption, and (5) optimal water allocation for minimizing of damage. In this paper, we especially give a detail description of functions (3) and (5). For (3), we construct estimation model based on Kalman-filter theory, and give an estimation result. For (5), we propose calculation method of the damage rate of paddy from cold weather, and give a simulation result of optimal water distribution to thirty paddy fields. Key-Words: Paddy field, Prediction of growth stages, Water level control, Estimating mean water level, Predict field consumption, Optimal water allocation