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北京西郊蓄洪工程完工 俩砂石坑能容三个昆明湖

2016-07-08 03:11:43    北京晨报

原标题:西郊俩砂石坑能喝700万方雨水

朋友圈里津津乐道的“国外防洪神器”——金属防洪墙靠不靠谱还不知道,而从大禹治水开始,我们的民族就知道防洪“疏胜于堵”。在京西,西五环之侧、田村山南路北侧,巨大的西郊砂石坑蓄洪工程已全面完工(见图),以总计700万立方米的“胸怀”迎接夏季可能的暴雨。有了这道防洪屏障,一旦暴雨来临,京城西部的洪水将被拦蓄,不能进入中心城区。而日常它又是京西居民的一个大型亲水休闲公园,预计今年10月份对社会开放。

蓄雨洪多达三个昆明湖

挨着西五环的石景山居民,年轻点儿的,西郊砂石坑是他们从小看到大的“大坑”,这曾是一个开采砂石的大坑。从2014年2月开工建设后,到今年建设基本完成,终于实现了北京市区防洪排水体系“西蓄、东排、南北分洪”,“西蓄”中的重要一环。

北京晨报记者昨天在西郊砂石坑工程中的阜石路砂石坑看到,这里好似一个层层递进的大盆地,共分四个“梯级”,沿着台阶可以缓步走入“盆地”,每一个梯级都有漂亮的绿化。如果不是昨天高温高湿、轻霾笼罩,已经栽植好的花花草草搭配蓝天会更清新漂亮。

阜石路砂石坑这个大盆地能装680万立方米的雨洪。也就是说,一旦京城遭遇南方这样的暴雨,西部地区的雨洪,包括8.4平方公里的八大处沟流域,18.6平方公里的北八排水沟、琅璜沟流域产生的雨水,都能妥妥地被砂石坑给“喝”掉。洪水被拦截在“大盆地”里,就不会进入中心城区。除了能喝进680万立方米的阜石路砂石坑,主要作用是“削峰”的20万立方米西黄村砂石坑也已开始“工作”,两大砂石坑一共可拦蓄雨洪700万立方米。要折算成昆明湖的水,足足三个多。

浪漫的城市水利公园

毕竟暴雨洪涝的时候少,大部分时间里,漂亮的大盆地空着太浪费。按照规划,西郊砂石坑蓄洪工程同时“兼职”休闲亲水公园。未来,这里将成沁水幽谷,“水来人退,水退人还”。

记者在现场看到,规划的公园因临近西五环晋元桥,取名为“晋元滨水公园”。共设有四个公园大门入口,两个车行、两个人行。公园内设有“九曲花溪”“浅水湾”“阳光草坪”“坡面花海”等景观,在公园东侧将打造7个主题花园,最“盆底”的湖水命名为“净湖”“沁湖”“浣湖”“润湖”等。公园设有人行坡道、环湖路、滨水步道等游览路线,还有停车场、卫生间等设施。多个防汛库错落其中,公园最东侧设有“防汛抢险平台”。规划者介绍,此为“沁谷”,作为一座浪漫的城市水利公园,寓意甘霖润物无声,芬芳沁人心脾,一为雨水利用,一为花田景观。今年10月,公园将对外开放。

■马上就访

错峰退水

保城区安全

北京市水务工程建设与管理事务中心总工程师温明霞告诉记者,西郊砂石坑的设计通过调度,使雨洪不进入永引渠和下游,而是滞蓄到西郊砂石坑,以缓解玉渊潭以下城区河道的防洪压力。“等到雨洪水的洪峰过去后,再将砂石坑的水退下去,错峰退水保证城区的防洪安全。”

温明霞说,有了西郊砂石坑,上游洪水不进城,下游排洪压力得到缓解。温明霞表示,在西郊砂石坑积蓄的雨洪还将通过自然入渗,由西向东慢速回补地下水,设计的每天回补量为8万方。

北京晨报记者

王海亮 文并摄

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