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第一百三九章 水利经年,蜀地粮仓(1 / 2)

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蜀郡百姓的请愿,教玄应离大为感动,片刻间便解决了令人头痛的民夫不足一事。

只有些事需得提前与老乡等人吩咐清楚,玄应离说道:“老乡,你们能来相助,应离十分感动,正好解了应离的燃眉之急也。只一件事,你得帮忙与乡亲们分说明白。”

老乡点了点头,问道:“郡守大人,不知是何事,还请尽管吩咐?”

玄应离鼻腔发出浓浓的声音,说道:“老丈,还请你与乡亲们说道说道,凡鳏寡孤独者、家中无兄弟者、无子嗣者、上有老母、下有弱子者,还请他们归家,兴修水利乃是长年累月之事,若长年不在家中看顾,应离于心难安,秦王亦难王也。”

老丈闻言,方才止住的泪水,又不期然而下。秦国下蜀之后的惶恐之心,总算落到了实处。

万事已俱备,只欠一股东风矣。

......

玄应离历时许久,东奔西走,摸索不少古人的治水经验,譬如三过其门而不入的大禹等。精心挑选,这才定下以汶水上游支干流出山口处,作为此次水利的实施地点。

工程极为浩大,总的来说,玄应离将汶水一分为二:其中一条流入地势开阔之处,此流向既可以分走洪水带来的灾祸,又可以引来流水灌良田、变害处为利处。

再者具体如何施行,玄应离分了三大兴修之口。

其一:玄应离首先定下修筑一首引水分流的口水,因其一道口子极似宝瓶,便称之为宝瓶口。宝瓶口,一分为二,分在东边的称之为内江,可供给灌溉渠用水;分在西边的则称之为外江,乃是汶水的主流。

此法好处在于:将汶江水水流共分为两道,使汶江水水流向东边的地势平坦之处,同时亦可减少西边的汶江水流的流量,从而使西边的江水不再泛滥,同一时间亦也能解除东边地势平坦之处的干旱之状,灌溉此处的良田。

又在汶江一个县城的南岸筑了离碓,离碓便是开凿岩石之后,被隔开的石堆,夹放在内江、外江之间。离碓的东侧便是内江的流水口,亦是宝瓶之口,此口具有节制水流的作用。

玄应离考虑到,分水鱼嘴虽然对汶水能起到,分流以及灌溉的作用,但因此东边平坦处的地势高于汶水主流,汶江之水难以汇宝瓶口。

便在此宝瓶口上游增添另一处水事,便是其二。

其二:玄应离采用中流作堰的方法,在汶水峡内用石块砌成石埂,规划其形似鱼嘴,便称叫汶水鱼嘴,也称分水鱼鱼嘴。

顾名思义,分水鱼嘴,便是一个分水的建筑工程,将汶水一分为二,使汶江水能够顺利东流,有且保持着一定的水流之量,进而充分发挥宝瓶口,分流二江及其灌溉良田的功用,便又在汶江水中修筑一道分水堰,形似“鱼嘴”,迫使大量汶江之水,乖觉的流入宝瓶口。

分水鱼嘴将汶江江水一分为二:西边的水流称之为外江,它沿汶江河道顺流而下;东边的水流称之为内江,它流经宝瓶口。

由于内江窄而深,外江宽而浅,天气干旱之时,水源枯竭,水势偏低,则六成的江水便汇入东边的内江之中,则可保证地势平坦之处的蜀民一应生活吃用之水。

而洪水泛滥之时,水势宏大,水面升高,绝大部分的汶江之水,便从西边江面较宽的外江排走,此水利大成,江水内外的水流便自主分流,此处的构思便是后世所谓的“四六分水”。

其三:玄应离为了更进一步的控制住宝瓶口汇入的水量,使其更为妥善的分流洪水及其降低洪灾的祸害,防止汶江之水浇灌良田之时的水流,时而大来时而小,情况飘忽不定。

玄应离便在分水鱼嘴堤坝的尾部处,紧挨着宝瓶口之处,建了两道溢洪道,分别称为平水槽和“飞沙堰”溢洪道,从而确保内江中无灾害。

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