농업용 저수지에서의 농업용수 잠재능 평가

Abstract

The new concept of agricultural water supply potential, which is mean annual turnover rate times unit storage capacity, was introduced for agriculturalreservoirs. We investigated characteristics of mean annual turnover rate and unit storage capacity for agricultural reservoirs with storage capacity of over1 million m3. The curve of agricultural water supply potential represents change in mean annul turnover rate according to change in unit storage capacity. The mean annual turnover rate and unit storage capacity in the reservoirs with high minimum storage ratio are significantly higher than those in thereservoirs with low minimum storage ratio. Most of unstable water supply reservoirs showed low mean annual turnover rate or low unit storage capacity,indicating that mean annual turnover rate may be an index of stability degree for agricultural water use. The reservoirs with mean annual turnover rateof over 2 and unit storage capacity of over 0.8 m may be estimated as the stable water supply zone for 10 frequency dry year. The reservoirs with highagricultural water supply potential can belong to the wide range of stable water supply zone. The results suggest that relation between mean annualturnover rate and unit storage capacity may be used in evaluating stability degree for agricultural water supply in the reservoirs.