防洪区是指洪水泛滥可能淹及的地区，分为洪泛区、蓄滞洪区和防洪保护区。洪泛区是指尚无工程设施保护的洪水泛滥所及的地区。蓄滞洪区是指包括分洪口在内的河堤背水面以外临时贮存洪水的低洼地区及湖泊等。防洪保护区是指在防洪标准内受防洪工程设施保护的地区。
此地区的大片绿地和植被(分别显示为浅绿和深绿色)包含了自然保护区域、牧地和防洪区。
Large tracts of grassy fields and forests in the area (light to dark green respectively) include nature preserves, grazing lands, and flood control areas.
特别是对于短期变化(如防洪区)较大、面积较大而复杂的研究区来说，这一方法的应用弥补了单一分类方法的不足。
Especially, accuracy of modified classification is largely improved for those regions of short term "s change, such as flood control district, and for much bigger and complicate study area."
一些是物理补救，防洪需要堤防、大坝或受保护的洪泛区或随水涨落的房屋。
Some involve physical remedies. Flood protection demands embankments, or DAMS, or protected flood plains, or houses that rise and fall with the waters.
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