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近年来随着国民经济的发展,人口增长,耕地减少,水资源日趋紧缺,已成为制约农业发展的主要因素。因此节约用水已成为一项长期的基本国策。一方是水资源紧缺,而另一方是用水浪费严重。河南是农业大省,农业用水占总用水量的85%以上,但农田灌溉渠系水利用系数只有0.3～0.5,即有50%以上的水在往田间输送途中被浪费掉,据多年资料统计在田间灌溉水中水的损失浪费更严重,灌溉水利用率<30%。灌溉定额旱作高达1500m~3/hm~2以上,水稻达1.2万～1.5万m~3/hm~2以上,再加上近年来工业尤其是乡镇企业发展迅速,水质污染严重,更加剧了水资源的供需矛盾。
In recent years, with the development of the national economy, population growth, reduction of arable land, and increasingly scarce water resources, these have become the main factors restricting the development of agriculture. Therefore, water conservation has become a long-term basic state policy. One is water shortages, while the other is a serious waste of water. Henan is a major agricultural province, agricultural water accounts for more than 85% of the total water consumption, but irrigation water system irrigation coefficient of only 0.3 to 0.5, that is, more than 50% of water on the way to the field was wasted, according to years of statistics Field irrigation water loss of water more serious waste, irrigation water utilization rate of <30%. Irrigation quota up to 1500m ~ 3 / hm ~ 2 above dry, rice up to 12000 ~ 15000 m ~ 3 / hm ~ 2 above, coupled with the rapid development of industries in recent years, especially township enterprises, water pollution is serious, more serious Water supply and demand conflicts.