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古(gu)洞口（Ⅰ級）水利(li)水電(dian)工程位(wei)于(yu)湖北省(sheng)興(xing)(xing)山(shan)縣境內(nei)，壩址(zhi)在長江支(zhi)流(liu)香溪河(he)上游(you)古(gu)夫河(he)段的(de)古(gu)洞口峽谷出(chu)口處，下距(ju)興(xing)(xing)山(shan)縣新縣城(cheng)古(gu)夫鎮2.5公(gong)里(li)，距(ju)縣城(cheng)高陽鎮18.5公(gong)里(li)，為古(gu)夫河(he)流(liu)域水電(dian)開發的(de)近期骨(gu)干工程。

古洞(dong)口(kou)工程(cheng)泄(xie)洪兼放空洞(dong)位(wei)于大壩左岸，圓塔式(shi)進(jin)水(shui)口(kou)的進(jin)口(kou)檢(jian)修閘室底(di)板高(gao)程(cheng)270.0米，弧(hu)形閘門位(wei)于隧洞(dong)中部(bu)，隧洞(dong)全長421米，均(jun)采(cai)用(yong)鋼筋(jin)砼襯砌，上游(you)有壓(ya)段(duan)(duan)長183米，襯厚0.6米，由(you)兩(liang)段(duan)(duan)方(fang)圓漸變段(duan)(duan)與檢(jian)修塔和工作(zuo)閘室相接。下游(you)無壓(ya)段(duan)(duan)長175米，出口(kou)采(cai)用(yong)斜切坎(kan)挑流(liu)消能。要求(qiu)泄(xie)洪洞(dong)鋼筋(jin)砼施(shi)工必須保證(zheng)質量，滿(man)足抗沖、抗滲功能的要求(qiu)，做到(dao)澆筑密實、表面平整光滑(hua)。

古(gu)洞(dong)口工程為Ⅱ等大（2）型工程，主(zhu)要(yao)由攔河壩(ba)、泄洪建(jian)筑(zhu)(zhu)物、引水系統、廠房(fang)及(ji)開關站組(zu)成。壩(ba)址處(chu)河道峽窄,兩岸巖(yan)坡陡竣,河床覆蓋層較深。且河道自峽谷出口處(chu)急轉向右(you)，右(you)岸下游地勢開闊，交通方便。根據壩(ba)址地形、地質特(te)點、及(ji)樞紐布置要(yao)求，泄洪建(jian)筑(zhu)(zhu)物（即溢洪道和泄洪兼放空隧洞(dong)）布置在左岸，引水系統及(ji)電(dian)站廠房(fang)布置在右(you)岸。

1、泄洪兼放空隧洞

泄洪(hong)兼放空隧洞位(wei)于大壩左(zuo)岸，由進(jin)水口、有壓段(duan)、工作(zuo)閘室、無壓段(duan)及末端挑流鼻坎組(zu)成(cheng)，全長421米，進(jin)水口底板高程為270米，校核洪(hong)水位(wei)時(shi)最大泄量(liang)1250立方米/秒。

1987年(nian)(nian)(nian)(nian)興(xing)(xing)山縣(xian)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)局委(wei)(wei)托中南勘(kan)測(ce)設(she)(she)計(ji)(ji)(ji)研(yan)(yan)究(jiu)院(yuan)宜昌(chang)(chang)分院(yuan)，按(an)照(zhao)國家基本(ben)建設(she)(she)程(cheng)序進(jin)行古(gu)(gu)夫河(he)流域查勘(kan)及(ji)其(qi)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)開(kai)(kai)發(fa)規劃，1988年(nian)(nian)(nian)(nian)上半年(nian)(nian)(nian)(nian)完成《古(gu)(gu)洞(dong)口（Ⅰ、Ⅱ級）水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)樞(shu)紐工(gong)(gong)(gong)程(cheng)可行性(xing)研(yan)(yan)究(jiu)報(bao)告(gao)(gao)》，同(tong)(tong)年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)通過(guo)湖(hu)(hu)北(bei)省水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)廳(ting)會(hui)同(tong)(tong)省計(ji)(ji)(ji)委(wei)(wei)工(gong)(gong)(gong)程(cheng)咨詢公(gong)司對"可研(yan)(yan)報(bao)告(gao)(gao)"進(jin)行了(le)(le)審查和評估(gu)。1989年(nian)(nian)(nian)(nian)8月(yue)(yue)(yue)9日，湖(hu)(hu)北(bei)省計(ji)(ji)(ji)劃委(wei)(wei)員(yuan)會(hui)下達了(le)(le)《關(guan)(guan)于(yu)興(xing)(xing)山縣(xian)古(gu)(gu)洞(dong)口水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)項目建議書(shu)的批(pi)復》。1990年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)原能(neng)源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃設(she)(she)計(ji)(ji)(ji)總(zong)(zong)(zong)院(yuan)又對該(gai)報(bao)告(gao)(gao)進(jin)行了(le)(le)復審，同(tong)(tong)意(yi)(yi)(yi)該(gai)報(bao)告(gao)(gao)中提出(chu)的主要(yao)結論以(yi)工(gong)(gong)(gong)程(cheng)設(she)(she)計(ji)(ji)(ji)方(fang)案(an)及(ji)省計(ji)(ji)(ji)委(wei)(wei)、水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)廳(ting)評估(gu)與審查意(yi)(yi)(yi)見。中南院(yuan)宜昌(chang)(chang)分院(yuan)于(yu)1990年(nian)(nian)(nian)(nian)10月(yue)(yue)(yue)開(kai)(kai)始(shi)進(jin)行該(gai)工(gong)(gong)(gong)程(cheng)的初(chu)步設(she)(she)計(ji)(ji)(ji)工(gong)(gong)(gong)作，1991年(nian)(nian)(nian)(nian)10月(yue)(yue)(yue)提交了(le)(le)初(chu)步設(she)(she)計(ji)(ji)(ji)報(bao)告(gao)(gao)。1991年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)12日，水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)下達了(le)(le)《關(guan)(guan)于(yu)湖(hu)(hu)北(bei)省興(xing)(xing)山縣(xian)古(gu)(gu)洞(dong)口水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)（Ⅰ級）設(she)(she)計(ji)(ji)(ji)任(ren)務(wu)書(shu)的批(pi)復》。1992年(nian)(nian)(nian)(nian)3月(yue)(yue)(yue)通過(guo)了(le)(le)由(you)原能(neng)源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃設(she)(she)計(ji)(ji)(ji)總(zong)(zong)(zong)院(yuan)和湖(hu)(hu)北(bei)省水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)廳(ting)聯合主持的審查，審查同(tong)(tong)意(yi)(yi)(yi)初(chu)步設(she)(she)計(ji)(ji)(ji)報(bao)告(gao)(gao)提出(chu)的樞(shu)紐總(zong)(zong)(zong)體布置方(fang)案(an)。同(tong)(tong)年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)以(yi)（1992）43號文(wen)（即《關(guan)(guan)于(yu)湖(hu)(hu)北(bei)興(xing)(xing)山古(gu)(gu)洞(dong)口（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)程(cheng)初(chu)步設(she)(she)計(ji)(ji)(ji)報(bao)告(gao)(gao)的批(pi)復》）批(pi)準(zhun)了(le)(le)該(gai)工(gong)(gong)(gong)程(cheng)初(chu)步設(she)(she)計(ji)(ji)(ji)報(bao)告(gao)(gao)。1992年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)29日湖(hu)(hu)北(bei)省計(ji)(ji)(ji)劃委(wei)(wei)員(yuan)會(hui)下達了(le)(le)《關(guan)(guan)于(yu)轉發(fa)省政府批(pi)準(zhun)興(xing)(xing)山縣(xian)古(gu)(gu)洞(dong)口水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)工(gong)(gong)(gong)程(cheng)一九九二年(nian)(nian)(nian)(nian)新開(kai)(kai)工(gong)(gong)(gong)的建設(she)(she)通知(zhi)》。1994年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)根據興(xing)(xing)山工(gong)(gong)(gong)農(nong)業生(sheng)產對電(dian)(dian)(dian)力的需(xu)要(yao)，特(te)別(bie)是縣(xian)電(dian)(dian)(dian)網對調峰(feng)容(rong)量的需(xu)要(yao)，提出(chu)《古(gu)(gu)洞(dong)口（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)程(cheng)電(dian)(dian)(dian)站(zhan)(zhan)增(zeng)容(rong)論證報(bao)告(gao)(gao)》。1996年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)由(you)水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃設(she)(she)計(ji)(ji)(ji)總(zong)(zong)(zong)院(yuan)的工(gong)(gong)(gong)程(cheng)設(she)(she)計(ji)(ji)(ji)進(jin)行了(le)(le)復審，同(tong)(tong)意(yi)(yi)(yi)電(dian)(dian)(dian)站(zhan)(zhan)裝機容(rong)量36兆(zhao)瓦(wa)，增(zeng)至45兆(zhao)瓦(wa)，水(shui)(shui)(shui)(shui)(shui)庫大壩由(you)2000年(nian)(nian)(nian)(nian)一遇(yu)洪水(shui)(shui)(shui)(shui)(shui)校核(he)提高(gao)到(dao)5000年(nian)(nian)(nian)(nian)一遇(yu)洪水(shui)(shui)(shui)(shui)(shui)校核(he)。1997年(nian)(nian)(nian)(nian)3月(yue)(yue)(yue)水(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)部(bu)(bu)以(yi)水(shui)(shui)(shui)(shui)(shui)規設(she)(she)（1997）4號文(wen)對審核(he)意(yi)(yi)(yi)見予以(yi)了(le)(le)批(pi)復，并提出(chu)了(le)(le)明確的審核(he)意(yi)(yi)(yi)見。

古洞口工程(cheng)于1993年3月(yue)1日(ri)正式開工，1999年9月(yue)9日(ri)首(shou)臺機組投產(chan)發電。2000年9月(yue)8日(ri)第二臺機組投產(chan)發電，其中泄洪兼放(fang)空(kong)隧洞施工情(qing)況如下：

泄(xie)洪洞開(kai)挖工(gong)(gong)(gong)(gong)程(cheng)于(yu)(yu)1997年(nian)(nian)(nian)(nian)2月(yue)(yue)(yue)10日(ri)(ri)(ri)開(kai)工(gong)(gong)(gong)(gong)，1997年(nian)(nian)(nian)(nian)6月(yue)(yue)(yue)16日(ri)(ri)(ri)全洞貫通。檢修塔、有壓段(duan)(duan)(duan)、工(gong)(gong)(gong)(gong)作(zuo)閘室(shi)段(duan)(duan)(duan)砼于(yu)(yu)1998年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)3日(ri)(ri)(ri)開(kai)工(gong)(gong)(gong)(gong)，于(yu)(yu)1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)11日(ri)(ri)(ri)澆筑結(jie)束(shu)(shu)(shu)。事故檢修門于(yu)(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)開(kai)工(gong)(gong)(gong)(gong)，2000年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)安裝(zhuang)結(jie)束(shu)(shu)(shu)。工(gong)(gong)(gong)(gong)作(zuo)弧門于(yu)(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)30日(ri)(ri)(ri)開(kai)工(gong)(gong)(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)20日(ri)(ri)(ri)安裝(zhuang)結(jie)束(shu)(shu)(shu)。無壓段(duan)(duan)(duan)砼于(yu)(yu)2003年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)1日(ri)(ri)(ri)開(kai)工(gong)(gong)(gong)(gong)，2004年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)4日(ri)(ri)(ri)施工(gong)(gong)(gong)(gong)結(jie)束(shu)(shu)(shu)。挑流(liu)鼻坎段(duan)(duan)(duan)砼于(yu)(yu)2000年(nian)(nian)(nian)(nian)4月(yue)(yue)(yue)5日(ri)(ri)(ri)開(kai)倉(cang)澆筑至(zhi)2000年(nian)(nian)(nian)(nian)6月(yue)(yue)(yue)3日(ri)(ri)(ri)竣工(gong)(gong)(gong)(gong)。回填、固結(jie)灌漿施工(gong)(gong)(gong)(gong)于(yu)(yu)1999年(nian)(nian)(nian)(nian)元月(yue)(yue)(yue)15日(ri)(ri)(ri)施工(gong)(gong)(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)12日(ri)(ri)(ri)結(jie)束(shu)(shu)(shu)。

根據中華人民共(gong)和國《防洪標(biao)準(zhun)》GB50201-94規定，古洞口（Ⅰ級）水利(li)水電工程永(yong)久建筑(zhu)物洪水標(biao)準(zhun)為：

混(hun)凝土面板(ban)堆石壩設計洪(hong)水(shui)(shui)重(zhong)(zhong)現期為100年，校核洪(hong)水(shui)(shui)重(zhong)(zhong)現期為5000年。

廠房洪(hong)水重現期為(wei)100年，校核洪(hong)水重現期為(wei)200年。

混凝土面板堆石壩按(an)1級(ji)建(jian)(jian)筑物(wu)設(she)計，洪水標準(zhun)按(an)2級(ji)建(jian)(jian)筑物(wu)設(she)計；

泄水建筑物按2級(ji)建筑物設(she)計；

引水建筑(zhu)物及發(fa)電廠房按3級建筑(zhu)物設計。

古(gu)洞(dong)口(kou)電(dian)站下距(ju)新縣城所在(zai)地僅(jin)2.5公里，為了(le)(le)(le)(le)(le)保證(zheng)下游人(ren)(ren)員、財產的(de)(de)安全，同時也為自(zi)身(shen)建(jian)筑物的(de)(de)防(fang)(fang)洪需要(yao)，歷(li)年(nian)來設計單(dan)位(wei)(wei)中南勘測設計院(yuan)以文(wen)件(jian)報(bao)送了(le)(le)(le)(le)(le)《湖(hu)北香溪(xi)河古(gu)洞(dong)口(kou)（Ⅰ級）水(shui)利水(shui)電(dian)工程(cheng)渡(du)汛(xun)(xun)意見》。按照要(yao)求，電(dian)業(ye)公司每(mei)年(nian)均認(ren)真組織(zhi)編織(zhi)了(le)(le)(le)(le)(le)《古(gu)洞(dong)口(kou)水(shui)庫渡(du)汛(xun)(xun)方案的(de)(de)報(bao)告》，并(bing)(bing)上報(bao)各(ge)級防(fang)(fang)洪抗旱指揮部門。在(zai)接到報(bao)告批復(fu)后(hou)，按照批復(fu)文(wen)件(jian)要(yao)求認(ren)真落實人(ren)(ren)員、機(ji)械(xie)和物資，并(bing)(bing)成(cheng)立了(le)(le)(le)(le)(le)以業(ye)主、監(jian)理、各(ge)施(shi)(shi)工單(dan)位(wei)(wei)責任人(ren)(ren)和相關人(ren)(ren)員組成(cheng)的(de)(de)"古(gu)洞(dong)口(kou)工程(cheng)防(fang)(fang)汛(xun)(xun)指揮部"。電(dian)業(ye)公司成(cheng)立了(le)(le)(le)(le)(le)"防(fang)(fang)洪搶(qiang)險突擊隊"，各(ge)施(shi)(shi)工單(dan)位(wei)(wei)也成(cheng)立了(le)(le)(le)(le)(le)相應機(ji)構，落實了(le)(le)(le)(le)(le)各(ge)種措施(shi)(shi)。由于工程(cheng)按渡(du)汛(xun)(xun)要(yao)求完成(cheng)了(le)(le)(le)(le)(le)工程(cheng)項(xiang)目施(shi)(shi)工，各(ge)方面配合緊密，歷(li)年(nian)來沒有發(fa)生工程(cheng)防(fang)(fang)洪渡(du)汛(xun)(xun)損(sun)失。

該工程由省、市(shi)兩級(ji)質量監督機構行使政府監督職能(neng)。