瓊海(hai)市合水(shui)水(shui)庫(ku)位于海(hai)南省(sheng)瓊海(hai)市新園(yuan)水(shui)系的(de)福田(tian)鎮(zhen)境內。1965年(nian)(nian)10月興建(jian)，為(wei)均(jun)質土(tu)(tu)壩(ba)(ba)(ba)(ba)，主(zhu)壩(ba)(ba)(ba)(ba)頂(ding)長950米(mi)(mi)(mi)(mi)，副壩(ba)(ba)(ba)(ba)1座長325米(mi)(mi)(mi)(mi)。1966年(nian)(nian)土(tu)(tu)壩(ba)(ba)(ba)(ba)填(tian)筑達設計高(gao)(gao)程。土(tu)(tu)壩(ba)(ba)(ba)(ba)上游護(hu)坡(po)(po)采用混(hun)(hun)凝(ning)土(tu)(tu)預制塊50×50×10厘米(mi)(mi)(mi)(mi)，現澆混(hun)(hun)凝(ning)土(tu)(tu)10米(mi)(mi)(mi)(mi)×1米(mi)(mi)(mi)(mi)×10厘米(mi)(mi)(mi)(mi)板塊和漿砌石(shi)（設有砂(sha)碎石(shi)墊(dian)層厚15厘米(mi)(mi)(mi)(mi)）厚30厘米(mi)(mi)(mi)(mi)三種型式。該壩(ba)(ba)(ba)(ba)處在強臺(tai)(tai)風(feng)(feng)(feng)風(feng)(feng)(feng)口，對(dui)大壩(ba)(ba)(ba)(ba)安全威脅很(hen)大。1970～1972年(nian)(nian)間，大壩(ba)(ba)(ba)(ba)及護(hu)坡(po)(po)遭多次破壞。1972年(nian)(nian)20號臺(tai)(tai)風(feng)(feng)(feng)破壞最為(wei)嚴重，所有混(hun)(hun)凝(ning)土(tu)(tu)預制塊護(hu)坡(po)(po)全部沖(chong)毀，溢(yi)洪(hong)道左岸(an)350米(mi)(mi)(mi)(mi)土(tu)(tu)壩(ba)(ba)(ba)(ba)嚴重崩(beng)塌。1973年(nian)(nian)第(di)14號臺(tai)(tai)風(feng)(feng)(feng)溢(yi)洪(hong)道右岸(an)第(di)一孔人行(xing)橋，也被(bei)臺(tai)(tai)風(feng)(feng)(feng)推移向(xiang)下游5厘米(mi)(mi)(mi)(mi)。1976年(nian)(nian)重修為(wei)漿砌石(shi)護(hu)坡(po)(po)，同時建(jian)一米(mi)(mi)(mi)(mi)高(gao)(gao)的(de)漿砌石(shi)防(fang)浪墻。此后一直安全運行(xing)。
該(gai)庫靠近海邊，海風含有鹽堿，對金屬結(jie)構設(she)備(bei)有腐(fu)蝕作用，易損壞。
溢洪道設(she)在主壩(ba)中間，設(she)有6孔6×3.2米平板鋼閘(zha)門控(kong)制的(de)寬頂堰。漿(jiang)砌石陡坡(po)，未端(duan)澆(jiao)筑抗(kang)沖混凝(ning)土護面，底(di)流消(xiao)能。漿(jiang)砌石底(di)板漏(lou)水嚴(yan)重，1982年改建(jian)4條(tiao)橫向(xiang)(xiang)、2條(tiao)縱向(xiang)(xiang)導滲(shen)溝，引排滲(shen)漏(lou)水，減少底(di)板揚壓(ya)力。1980年還在閘(zha)室前建(jian)一道混凝(ning)土防滲(shen)墻(qiang)。
設計灌溉面積1633公(gong)(gong)(gong)(gong)頃。現(xian)有干渠2條長20.1公(gong)(gong)(gong)(gong)里(li)(li)(li)（混(hun)凝(ning)土(tu)(tu)管(guan)2.4公(gong)(gong)(gong)(gong)里(li)(li)(li)，混(hun)凝(ning)土(tu)(tu)防(fang)滲(shen)4.2公(gong)(gong)(gong)(gong)里(li)(li)(li)），支渠長86.5公(gong)(gong)(gong)(gong)里(li)(li)(li)（混(hun)凝(ning)土(tu)(tu)管(guan)2.1公(gong)(gong)(gong)(gong)里(li)(li)(li)，混(hun)凝(ning)土(tu)(tu)防(fang)滲(shen)24公(gong)(gong)(gong)(gong)里(li)(li)(li)），渠堤(di)通車里(li)(li)(li)程11公(gong)(gong)(gong)(gong)里(li)(li)(li)。現(xian)灌溉面積1167公(gong)(gong)(gong)(gong)頃。
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