北京拟变“海绵城市”收集雨水
<p>众所周知，北京是座“资源性缺水”的城市，人均水资源占有量不足300立方米，一直以来都靠“南水北调”解决这一危机。如今，北京决定自力更生，通过将自身打造成“海绵城市”来自救。</p><p>请看相关报道：</p><p><span word="Beijing">Beijing</span>, <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span>'<span word="s">s</span> <span word="cities">cities</span> <span word="facing">facing</span> <span word="the">the</span> <span word="greatest">greatest</span> <span word="water">water</span> <span word="scarcity">scarcity</span>, <span word="aims">aims</span> <span word="to">to</span> <span word="transform">transform</span> <span word="into">into</span> <span word="a">a</span> "<span word="sponge">sponge</span> <span word="city">city</span>" <span word="to">to</span> <span word="effectively">effectively</span> <span word="collect">collect</span> <span word="and">and</span> <span word="use">use</span> <span word="rainfall">rainfall</span>.</p><p>作为世界上缺水问题最严重的城市之一，北京打算转型成为有效收集和利用雨水的“海绵城市”。</p><p>什么是海绵城市呢？“海绵城市”是指城市能够像海绵(<span word="sponge">sponge</span>)一样，具有良好的“弹性”(<span word="flexibility">flexibility</span>)，下雨时吸水、蓄水、渗水、净水(<span word="water">water</span> <span word="absorbing">absorbing</span> <span word="and">and</span> <span word="purifying">purifying</span>)，需要时将蓄存的水“释放”并加以利用。</p><p>目前，北京已建成25个蓄水池(<span word="reservoirs">reservoirs</span>)。今年，这些蓄水池已累计收集9万多立方米的雨水。明年，还将在部分下凹式立交桥建设26个蓄水池，用来收集雨水，而这些收集起来的雨水也将被用于道路降尘(<span word="dust">dust</span> <span word="reduction">reduction</span>)、绿化灌溉(<span word="greenbelt">greenbelt</span> <span word="irrigation">irrigation</span>)、洗车(<span word="car">car</span> <span word="washing">washing</span>)用水等。</p>
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