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古(gu)洞(dong)口（Ⅰ級）水(shui)(shui)利水(shui)(shui)電(dian)工程(cheng)位于湖北省興(xing)山縣境內(nei)，壩址在長江支流香溪河(he)上游(you)古(gu)夫(fu)河(he)段的(de)古(gu)洞(dong)口峽谷出(chu)口處，下距(ju)興(xing)山縣新縣城古(gu)夫(fu)鎮(zhen)2.5公里(li)，距(ju)縣城高陽鎮(zhen)18.5公里(li)，為(wei)古(gu)夫(fu)河(he)流域水(shui)(shui)電(dian)開發的(de)近期骨干工程(cheng)。

古洞(dong)(dong)口(kou)工程泄洪(hong)兼放空洞(dong)(dong)位(wei)于大壩左岸，圓塔式(shi)進水口(kou)的進口(kou)檢(jian)修閘室底板高(gao)程270.0米(mi)，弧形閘門位(wei)于隧(sui)(sui)洞(dong)(dong)中部，隧(sui)(sui)洞(dong)(dong)全長421米(mi)，均采用鋼(gang)(gang)筋砼(tong)(tong)襯砌(qi)，上游(you)有壓(ya)段(duan)(duan)長183米(mi)，襯厚0.6米(mi)，由(you)兩段(duan)(duan)方圓漸(jian)變段(duan)(duan)與(yu)檢(jian)修塔和工作閘室相接。下(xia)游(you)無壓(ya)段(duan)(duan)長175米(mi)，出口(kou)采用斜切坎挑流消能(neng)。要求泄洪(hong)洞(dong)(dong)鋼(gang)(gang)筋砼(tong)(tong)施工必須保證(zheng)質(zhi)量，滿足(zu)抗沖、抗滲(shen)功能(neng)的要求，做到澆筑密(mi)實、表面平整(zheng)光(guang)滑。

古(gu)洞口(kou)工(gong)程為(wei)Ⅱ等大(da)（2）型工(gong)程，主要由攔河壩(ba)、泄洪建筑物、引(yin)水系統、廠房及開關(guan)站組成。壩(ba)址(zhi)處(chu)河道(dao)峽(xia)窄,兩岸(an)(an)巖坡陡竣,河床覆蓋層較深。且河道(dao)自峽(xia)谷出口(kou)處(chu)急轉(zhuan)向右(you)，右(you)岸(an)(an)下游地勢開闊(kuo)，交通方便。根據壩(ba)址(zhi)地形、地質特(te)點(dian)、及樞紐(niu)布置(zhi)要求，泄洪建筑物（即溢(yi)洪道(dao)和泄洪兼放空(kong)隧洞）布置(zhi)在(zai)左岸(an)(an)，引(yin)水系統及電站廠房布置(zhi)在(zai)右(you)岸(an)(an)。

1、泄洪兼放空隧洞

泄(xie)洪兼(jian)放空(kong)隧洞位于大(da)壩左岸(an)，由進水(shui)(shui)口、有壓段、工作(zuo)閘室(shi)、無壓段及(ji)末端挑流鼻坎組成，全長(chang)421米(mi)(mi)，進水(shui)(shui)口底板高(gao)程為270米(mi)(mi)，校核洪水(shui)(shui)位時最大(da)泄(xie)量1250立方米(mi)(mi)/秒。

1987年(nian)(nian)(nian)(nian)興(xing)山(shan)縣(xian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)局委托中南勘測設(she)(she)(she)計(ji)(ji)研(yan)(yan)究院(yuan)宜昌分院(yuan)，按照國家基本建設(she)(she)(she)程(cheng)(cheng)序(xu)進行(xing)(xing)古(gu)夫河流域查(cha)勘及(ji)其(qi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)開發(fa)規(gui)劃(hua)，1988年(nian)(nian)(nian)(nian)上(shang)半年(nian)(nian)(nian)(nian)完成《古(gu)洞(dong)口(kou)（Ⅰ、Ⅱ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)樞紐(niu)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)可行(xing)(xing)性研(yan)(yan)究報(bao)(bao)告(gao)(gao)》，同年(nian)(nian)(nian)(nian)12月(yue)通(tong)(tong)過(guo)湖(hu)(hu)(hu)北省(sheng)(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)廳(ting)會同省(sheng)(sheng)計(ji)(ji)委工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)咨詢公司(si)對(dui)(dui)"可研(yan)(yan)報(bao)(bao)告(gao)(gao)"進行(xing)(xing)了(le)(le)審查(cha)和評估。1989年(nian)(nian)(nian)(nian)8月(yue)9日，湖(hu)(hu)(hu)北省(sheng)(sheng)計(ji)(ji)劃(hua)委員(yuan)會下(xia)(xia)達(da)(da)了(le)(le)《關于(yu)興(xing)山(shan)縣(xian)古(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)項目建議書(shu)的(de)批(pi)(pi)復(fu)(fu)》。1990年(nian)(nian)(nian)(nian)5月(yue)原(yuan)能源部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)又對(dui)(dui)該報(bao)(bao)告(gao)(gao)進行(xing)(xing)了(le)(le)復(fu)(fu)審，同意該報(bao)(bao)告(gao)(gao)中提(ti)出(chu)的(de)主(zhu)要(yao)(yao)結(jie)論以(yi)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)設(she)(she)(she)計(ji)(ji)方(fang)案(an)及(ji)省(sheng)(sheng)計(ji)(ji)委、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)廳(ting)評估與審查(cha)意見(jian)。中南院(yuan)宜昌分院(yuan)于(yu)1990年(nian)(nian)(nian)(nian)10月(yue)開始(shi)進行(xing)(xing)該工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)的(de)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)工(gong)(gong)(gong)(gong)(gong)(gong)作，1991年(nian)(nian)(nian)(nian)10月(yue)提(ti)交了(le)(le)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)(gao)。1991年(nian)(nian)(nian)(nian)12月(yue)12日，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部下(xia)(xia)達(da)(da)了(le)(le)《關于(yu)湖(hu)(hu)(hu)北省(sheng)(sheng)興(xing)山(shan)縣(xian)古(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)（Ⅰ級）設(she)(she)(she)計(ji)(ji)任(ren)務書(shu)的(de)批(pi)(pi)復(fu)(fu)》。1992年(nian)(nian)(nian)(nian)3月(yue)通(tong)(tong)過(guo)了(le)(le)由原(yuan)能源部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)和湖(hu)(hu)(hu)北省(sheng)(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)廳(ting)聯(lian)合(he)主(zhu)持的(de)審查(cha)，審查(cha)同意初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)(gao)提(ti)出(chu)的(de)樞紐(niu)總(zong)體布置方(fang)案(an)。同年(nian)(nian)(nian)(nian)7月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部以(yi)（1992）43號(hao)文（即《關于(yu)湖(hu)(hu)(hu)北興(xing)山(shan)古(gu)洞(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)(gao)的(de)批(pi)(pi)復(fu)(fu)》）批(pi)(pi)準(zhun)了(le)(le)該工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)(gao)。1992年(nian)(nian)(nian)(nian)12月(yue)29日湖(hu)(hu)(hu)北省(sheng)(sheng)計(ji)(ji)劃(hua)委員(yuan)會下(xia)(xia)達(da)(da)了(le)(le)《關于(yu)轉發(fa)省(sheng)(sheng)政府批(pi)(pi)準(zhun)興(xing)山(shan)縣(xian)古(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)一九(jiu)九(jiu)二年(nian)(nian)(nian)(nian)新開工(gong)(gong)(gong)(gong)(gong)(gong)的(de)建設(she)(she)(she)通(tong)(tong)知》。1994年(nian)(nian)(nian)(nian)7月(yue)根據(ju)興(xing)山(shan)工(gong)(gong)(gong)(gong)(gong)(gong)農業(ye)生(sheng)產對(dui)(dui)電(dian)(dian)(dian)力(li)的(de)需要(yao)(yao)，特別是(shi)縣(xian)電(dian)(dian)(dian)網對(dui)(dui)調峰容(rong)量的(de)需要(yao)(yao)，提(ti)出(chu)《古(gu)洞(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)電(dian)(dian)(dian)站(zhan)增(zeng)容(rong)論證(zheng)報(bao)(bao)告(gao)(gao)》。1996年(nian)(nian)(nian)(nian)11月(yue)由水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)的(de)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)設(she)(she)(she)計(ji)(ji)進行(xing)(xing)了(le)(le)復(fu)(fu)審，同意電(dian)(dian)(dian)站(zhan)裝(zhuang)機容(rong)量36兆(zhao)瓦(wa)，增(zeng)至45兆(zhao)瓦(wa)，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大(da)壩由2000年(nian)(nian)(nian)(nian)一遇(yu)洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)(he)提(ti)高到5000年(nian)(nian)(nian)(nian)一遇(yu)洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)(he)。1997年(nian)(nian)(nian)(nian)3月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)部以(yi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)規(gui)設(she)(she)(she)（1997）4號(hao)文對(dui)(dui)審核(he)(he)意見(jian)予以(yi)了(le)(le)批(pi)(pi)復(fu)(fu)，并提(ti)出(chu)了(le)(le)明確的(de)審核(he)(he)意見(jian)。

古洞口(kou)工程于1993年3月(yue)1日正式開工，1999年9月(yue)9日首臺機組投產(chan)發電。2000年9月(yue)8日第二臺機組投產(chan)發電，其(qi)中泄洪兼放空隧洞施工情況(kuang)如下：

泄洪洞(dong)(dong)開(kai)(kai)挖工程于(yu)(yu)(yu)1997年(nian)(nian)(nian)2月(yue)(yue)(yue)10日(ri)(ri)(ri)開(kai)(kai)工，1997年(nian)(nian)(nian)6月(yue)(yue)(yue)16日(ri)(ri)(ri)全洞(dong)(dong)貫通(tong)。檢(jian)(jian)修(xiu)塔、有(you)壓(ya)(ya)段、工作閘室(shi)段砼于(yu)(yu)(yu)1998年(nian)(nian)(nian)5月(yue)(yue)(yue)3日(ri)(ri)(ri)開(kai)(kai)工，于(yu)(yu)(yu)1999年(nian)(nian)(nian)5月(yue)(yue)(yue)11日(ri)(ri)(ri)澆(jiao)筑結(jie)(jie)(jie)束(shu)。事故檢(jian)(jian)修(xiu)門于(yu)(yu)(yu)1998年(nian)(nian)(nian)11月(yue)(yue)(yue)開(kai)(kai)工，2000年(nian)(nian)(nian)7月(yue)(yue)(yue)安(an)裝(zhuang)(zhuang)結(jie)(jie)(jie)束(shu)。工作弧門于(yu)(yu)(yu)1998年(nian)(nian)(nian)11月(yue)(yue)(yue)30日(ri)(ri)(ri)開(kai)(kai)工，1999年(nian)(nian)(nian)5月(yue)(yue)(yue)20日(ri)(ri)(ri)安(an)裝(zhuang)(zhuang)結(jie)(jie)(jie)束(shu)。無壓(ya)(ya)段砼于(yu)(yu)(yu)2003年(nian)(nian)(nian)12月(yue)(yue)(yue)1日(ri)(ri)(ri)開(kai)(kai)工，2004年(nian)(nian)(nian)5月(yue)(yue)(yue)4日(ri)(ri)(ri)施工結(jie)(jie)(jie)束(shu)。挑流鼻坎段砼于(yu)(yu)(yu)2000年(nian)(nian)(nian)4月(yue)(yue)(yue)5日(ri)(ri)(ri)開(kai)(kai)倉澆(jiao)筑至2000年(nian)(nian)(nian)6月(yue)(yue)(yue)3日(ri)(ri)(ri)竣(jun)工。回填、固結(jie)(jie)(jie)灌漿施工于(yu)(yu)(yu)1999年(nian)(nian)(nian)元(yuan)月(yue)(yue)(yue)15日(ri)(ri)(ri)施工，1999年(nian)(nian)(nian)5月(yue)(yue)(yue)12日(ri)(ri)(ri)結(jie)(jie)(jie)束(shu)。

根據中(zhong)華人民共和(he)國(guo)《防洪標(biao)準》GB50201-94規定，古洞口（Ⅰ級(ji)）水(shui)利水(shui)電工程永久建筑物(wu)洪水(shui)標(biao)準為：

混凝土(tu)面板堆石壩(ba)設計(ji)洪(hong)水(shui)重現期為100年(nian)，校核洪(hong)水(shui)重現期為5000年(nian)。

廠房洪(hong)水重現期(qi)為(wei)100年，校(xiao)核洪(hong)水重現期(qi)為(wei)200年。

混凝土(tu)面板堆石(shi)壩按1級建筑物設計，洪水標(biao)準按2級建筑物設計；

泄(xie)水建筑(zhu)物按(an)2級(ji)建筑(zhu)物設(she)計；

引水建筑物及發電(dian)廠房按3級建筑物設計。

古(gu)洞口電站下距新縣城所在(zai)地僅2.5公(gong)里，為了(le)保證下游人員、財產的(de)安(an)全，同時也為自身(shen)建(jian)筑物的(de)防(fang)洪需要(yao)，歷年來設(she)(she)計(ji)單位(wei)(wei)中(zhong)南勘測設(she)(she)計(ji)院以(yi)文(wen)件報(bao)送了(le)《湖(hu)北香(xiang)溪河(he)古(gu)洞口（Ⅰ級(ji)）水(shui)利水(shui)電工(gong)(gong)程(cheng)渡汛意(yi)見》。按照(zhao)要(yao)求(qiu)(qiu)，電業公(gong)司(si)(si)每年均認(ren)真組織編織了(le)《古(gu)洞口水(shui)庫渡汛方案的(de)報(bao)告》，并(bing)上報(bao)各(ge)級(ji)防(fang)洪抗旱指(zhi)揮部門。在(zai)接(jie)到(dao)報(bao)告批復(fu)后，按照(zhao)批復(fu)文(wen)件要(yao)求(qiu)(qiu)認(ren)真落實人員、機械(xie)和物資(zi)，并(bing)成(cheng)立(li)了(le)以(yi)業主、監理、各(ge)施(shi)工(gong)(gong)單位(wei)(wei)責任人和相(xiang)關人員組成(cheng)的(de)"古(gu)洞口工(gong)(gong)程(cheng)防(fang)汛指(zhi)揮部"。電業公(gong)司(si)(si)成(cheng)立(li)了(le)"防(fang)洪搶險突擊(ji)隊"，各(ge)施(shi)工(gong)(gong)單位(wei)(wei)也成(cheng)立(li)了(le)相(xiang)應(ying)機構(gou)，落實了(le)各(ge)種措施(shi)。由于(yu)工(gong)(gong)程(cheng)按渡汛要(yao)求(qiu)(qiu)完(wan)成(cheng)了(le)工(gong)(gong)程(cheng)項目施(shi)工(gong)(gong)，各(ge)方面配(pei)合(he)緊密(mi)，歷年來沒有發生工(gong)(gong)程(cheng)防(fang)洪渡汛損失。

該(gai)工程由省、市兩級質(zhi)量監(jian)督(du)機構行使(shi)政府監(jian)督(du)職能(neng)。