Mean annual stormflow losses from irrigated area

This dataset contains the stormflow and deep percolation losses from irrigated areas under different modes of scheduling in South Africa (SA). Stormflow losses from irrigated areas are due to frequent additional water applications to crops under irrigation, over and above those from naturally occurring rainfall events while deep percolation losses is due to very different soil water budgets of irrigated fields compared with those of surrounding rain-fed land uses. Distribution patterns over SA of mean annual stormflow losses from irrigated areas range from < 10 mm in the east to > 80 mm in the semi-arid west.

本数据集涵盖南非（SA）不同灌溉调度模式下灌溉区的暴雨径流（stormflow）损失与深层渗漏（deep percolation）损失。灌溉区的暴雨径流损失源于对灌溉作物的额外频繁施水，其损失规模远超自然降雨事件产生的径流损失；深层渗漏损失则是由于灌溉田块的土壤水分平衡（soil water budgets）与周边雨养土地利用方式存在显著差异所致。南非境内灌溉区年均暴雨径流损失的空间分布范围为：东部地区低于10毫米，半干旱西部地区高于80毫米。