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古(gu)(gu)洞(dong)口（Ⅰ級）水利(li)水電工程位(wei)于湖(hu)北(bei)省興山縣(xian)境內，壩址在長江支(zhi)流香(xiang)溪河(he)上游古(gu)(gu)夫(fu)河(he)段的古(gu)(gu)洞(dong)口峽谷(gu)出口處，下距(ju)興山縣(xian)新縣(xian)城古(gu)(gu)夫(fu)鎮2.5公里(li)，距(ju)縣(xian)城高陽鎮18.5公里(li)，為古(gu)(gu)夫(fu)河(he)流域水電開(kai)發的近(jin)期骨干工程。

古洞(dong)(dong)口工程(cheng)泄洪兼放空洞(dong)(dong)位于(yu)(yu)大壩(ba)左岸，圓塔式(shi)進水口的進口檢(jian)修閘室底板(ban)高(gao)程(cheng)270.0米(mi)，弧形閘門(men)位于(yu)(yu)隧洞(dong)(dong)中部(bu)，隧洞(dong)(dong)全長(chang)421米(mi)，均采用鋼筋(jin)砼(tong)襯(chen)砌，上游有壓段(duan)長(chang)183米(mi)，襯(chen)厚0.6米(mi)，由兩段(duan)方(fang)圓漸變(bian)段(duan)與檢(jian)修塔和工作(zuo)閘室相接。下游無壓段(duan)長(chang)175米(mi)，出(chu)口采用斜切坎挑(tiao)流消能。要求(qiu)泄洪洞(dong)(dong)鋼筋(jin)砼(tong)施工必須保證質量，滿足抗沖、抗滲(shen)功能的要求(qiu)，做(zuo)到澆筑密實、表面平整光(guang)滑。

古(gu)洞(dong)口(kou)工程為Ⅱ等(deng)大(da)（2）型(xing)工程，主要(yao)由攔河壩(ba)、泄洪(hong)建筑(zhu)物、引(yin)水系(xi)統、廠房及(ji)開(kai)(kai)關站組成。壩(ba)址(zhi)處河道峽(xia)窄,兩岸巖坡陡(dou)竣,河床(chuang)覆(fu)蓋層較深(shen)。且(qie)河道自峽(xia)谷(gu)出口(kou)處急(ji)轉向右，右岸下游地勢(shi)開(kai)(kai)闊，交通方便(bian)。根(gen)據壩(ba)址(zhi)地形、地質特點、及(ji)樞紐布(bu)置要(yao)求，泄洪(hong)建筑(zhu)物（即(ji)溢洪(hong)道和泄洪(hong)兼放(fang)空隧洞(dong)）布(bu)置在左岸，引(yin)水系(xi)統及(ji)電(dian)站廠房布(bu)置在右岸。

1、泄洪(hong)兼放空隧(sui)洞(dong)

泄洪兼放空隧洞位(wei)于(yu)大(da)壩左(zuo)岸，由進水(shui)口、有壓段(duan)、工作(zuo)閘室、無壓段(duan)及末(mo)端挑流鼻坎組(zu)成，全長421米，進水(shui)口底板高程為270米，校核(he)洪水(shui)位(wei)時最大(da)泄量1250立方(fang)米/秒。

1987年(nian)(nian)(nian)(nian)(nian)興山縣(xian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)局委(wei)托中(zhong)(zhong)南(nan)勘測設(she)(she)(she)計(ji)(ji)研(yan)究(jiu)院(yuan)宜(yi)昌分院(yuan)，按照國(guo)家(jia)基本建(jian)設(she)(she)(she)程序進(jin)(jin)(jin)行古(gu)(gu)夫(fu)河流域(yu)查勘及其水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)開發(fa)規劃(hua)，1988年(nian)(nian)(nian)(nian)(nian)上(shang)半(ban)年(nian)(nian)(nian)(nian)(nian)完(wan)成《古(gu)(gu)洞口(kou)(kou)（Ⅰ、Ⅱ級(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)樞紐工(gong)程可行性研(yan)究(jiu)報(bao)告(gao)(gao)(gao)(gao)》，同(tong)年(nian)(nian)(nian)(nian)(nian)12月(yue)(yue)通(tong)過湖(hu)(hu)北(bei)(bei)(bei)省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳(ting)會同(tong)省(sheng)計(ji)(ji)委(wei)工(gong)程咨詢公(gong)司對(dui)"可研(yan)報(bao)告(gao)(gao)(gao)(gao)"進(jin)(jin)(jin)行了(le)審查和評(ping)估(gu)(gu)。1989年(nian)(nian)(nian)(nian)(nian)8月(yue)(yue)9日，湖(hu)(hu)北(bei)(bei)(bei)省(sheng)計(ji)(ji)劃(hua)委(wei)員會下(xia)達了(le)《關(guan)于(yu)(yu)興山縣(xian)古(gu)(gu)洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)項目建(jian)議書(shu)(shu)的(de)(de)(de)(de)批復(fu)(fu)》。1990年(nian)(nian)(nian)(nian)(nian)5月(yue)(yue)原(yuan)能源(yuan)部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃(hua)設(she)(she)(she)計(ji)(ji)總院(yuan)又對(dui)該(gai)報(bao)告(gao)(gao)(gao)(gao)進(jin)(jin)(jin)行了(le)復(fu)(fu)審，同(tong)意(yi)該(gai)報(bao)告(gao)(gao)(gao)(gao)中(zhong)(zhong)提出(chu)的(de)(de)(de)(de)主要結論(lun)以(yi)工(gong)程設(she)(she)(she)計(ji)(ji)方(fang)案及省(sheng)計(ji)(ji)委(wei)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳(ting)評(ping)估(gu)(gu)與審查意(yi)見(jian)。中(zhong)(zhong)南(nan)院(yuan)宜(yi)昌分院(yuan)于(yu)(yu)1990年(nian)(nian)(nian)(nian)(nian)10月(yue)(yue)開始進(jin)(jin)(jin)行該(gai)工(gong)程的(de)(de)(de)(de)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)工(gong)作，1991年(nian)(nian)(nian)(nian)(nian)10月(yue)(yue)提交了(le)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)告(gao)(gao)(gao)(gao)。1991年(nian)(nian)(nian)(nian)(nian)12月(yue)(yue)12日，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部下(xia)達了(le)《關(guan)于(yu)(yu)湖(hu)(hu)北(bei)(bei)(bei)省(sheng)興山縣(xian)古(gu)(gu)洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)（Ⅰ級(ji)(ji)）設(she)(she)(she)計(ji)(ji)任(ren)務書(shu)(shu)的(de)(de)(de)(de)批復(fu)(fu)》。1992年(nian)(nian)(nian)(nian)(nian)3月(yue)(yue)通(tong)過了(le)由(you)原(yuan)能源(yuan)部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃(hua)設(she)(she)(she)計(ji)(ji)總院(yuan)和湖(hu)(hu)北(bei)(bei)(bei)省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳(ting)聯合(he)主持(chi)的(de)(de)(de)(de)審查，審查同(tong)意(yi)初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)告(gao)(gao)(gao)(gao)提出(chu)的(de)(de)(de)(de)樞紐總體(ti)布置方(fang)案。同(tong)年(nian)(nian)(nian)(nian)(nian)7月(yue)(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部以(yi)（1992）43號(hao)文（即《關(guan)于(yu)(yu)湖(hu)(hu)北(bei)(bei)(bei)興山古(gu)(gu)洞口(kou)(kou)（Ⅰ級(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)程初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)告(gao)(gao)(gao)(gao)的(de)(de)(de)(de)批復(fu)(fu)》）批準(zhun)了(le)該(gai)工(gong)程初(chu)(chu)步設(she)(she)(she)計(ji)(ji)報(bao)告(gao)(gao)(gao)(gao)。1992年(nian)(nian)(nian)(nian)(nian)12月(yue)(yue)29日湖(hu)(hu)北(bei)(bei)(bei)省(sheng)計(ji)(ji)劃(hua)委(wei)員會下(xia)達了(le)《關(guan)于(yu)(yu)轉發(fa)省(sheng)政(zheng)府(fu)批準(zhun)興山縣(xian)古(gu)(gu)洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)工(gong)程一九(jiu)九(jiu)二年(nian)(nian)(nian)(nian)(nian)新開工(gong)的(de)(de)(de)(de)建(jian)設(she)(she)(she)通(tong)知》。1994年(nian)(nian)(nian)(nian)(nian)7月(yue)(yue)根據興山工(gong)農業生(sheng)產對(dui)電(dian)(dian)(dian)力(li)的(de)(de)(de)(de)需(xu)要，特別是縣(xian)電(dian)(dian)(dian)網(wang)對(dui)調(diao)峰容量的(de)(de)(de)(de)需(xu)要，提出(chu)《古(gu)(gu)洞口(kou)(kou)（Ⅰ級(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)程電(dian)(dian)(dian)站(zhan)增(zeng)容論(lun)證(zheng)報(bao)告(gao)(gao)(gao)(gao)》。1996年(nian)(nian)(nian)(nian)(nian)11月(yue)(yue)由(you)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規劃(hua)設(she)(she)(she)計(ji)(ji)總院(yuan)的(de)(de)(de)(de)工(gong)程設(she)(she)(she)計(ji)(ji)進(jin)(jin)(jin)行了(le)復(fu)(fu)審，同(tong)意(yi)電(dian)(dian)(dian)站(zhan)裝機容量36兆瓦，增(zeng)至45兆瓦，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大壩由(you)2000年(nian)(nian)(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)提高到5000年(nian)(nian)(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)。1997年(nian)(nian)(nian)(nian)(nian)3月(yue)(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部以(yi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)規設(she)(she)(she)（1997）4號(hao)文對(dui)審核(he)意(yi)見(jian)予以(yi)了(le)批復(fu)(fu)，并(bing)提出(chu)了(le)明確的(de)(de)(de)(de)審核(he)意(yi)見(jian)。

古(gu)洞口工(gong)程(cheng)于1993年3月(yue)(yue)1日正式開工(gong)，1999年9月(yue)(yue)9日首臺(tai)機(ji)組(zu)投產發電。2000年9月(yue)(yue)8日第(di)二臺(tai)機(ji)組(zu)投產發電，其中泄洪(hong)兼放空隧洞施工(gong)情況如下(xia)：

泄洪洞(dong)開(kai)(kai)挖工(gong)(gong)程于(yu)(yu)(yu)1997年(nian)(nian)(nian)(nian)2月(yue)10日(ri)(ri)(ri)(ri)開(kai)(kai)工(gong)(gong)，1997年(nian)(nian)(nian)(nian)6月(yue)16日(ri)(ri)(ri)(ri)全洞(dong)貫通。檢修塔、有壓段、工(gong)(gong)作(zuo)閘室段砼(tong)于(yu)(yu)(yu)1998年(nian)(nian)(nian)(nian)5月(yue)3日(ri)(ri)(ri)(ri)開(kai)(kai)工(gong)(gong)，于(yu)(yu)(yu)1999年(nian)(nian)(nian)(nian)5月(yue)11日(ri)(ri)(ri)(ri)澆筑結束(shu)(shu)。事故檢修門(men)于(yu)(yu)(yu)1998年(nian)(nian)(nian)(nian)11月(yue)開(kai)(kai)工(gong)(gong)，2000年(nian)(nian)(nian)(nian)7月(yue)安(an)裝(zhuang)結束(shu)(shu)。工(gong)(gong)作(zuo)弧門(men)于(yu)(yu)(yu)1998年(nian)(nian)(nian)(nian)11月(yue)30日(ri)(ri)(ri)(ri)開(kai)(kai)工(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)20日(ri)(ri)(ri)(ri)安(an)裝(zhuang)結束(shu)(shu)。無壓段砼(tong)于(yu)(yu)(yu)2003年(nian)(nian)(nian)(nian)12月(yue)1日(ri)(ri)(ri)(ri)開(kai)(kai)工(gong)(gong)，2004年(nian)(nian)(nian)(nian)5月(yue)4日(ri)(ri)(ri)(ri)施(shi)工(gong)(gong)結束(shu)(shu)。挑(tiao)流鼻坎段砼(tong)于(yu)(yu)(yu)2000年(nian)(nian)(nian)(nian)4月(yue)5日(ri)(ri)(ri)(ri)開(kai)(kai)倉澆筑至(zhi)2000年(nian)(nian)(nian)(nian)6月(yue)3日(ri)(ri)(ri)(ri)竣工(gong)(gong)。回填(tian)、固結灌漿施(shi)工(gong)(gong)于(yu)(yu)(yu)1999年(nian)(nian)(nian)(nian)元(yuan)月(yue)15日(ri)(ri)(ri)(ri)施(shi)工(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)12日(ri)(ri)(ri)(ri)結束(shu)(shu)。

根據中(zhong)華人民(min)共和(he)國(guo)《防洪標準》GB50201-94規定，古洞口（Ⅰ級(ji)）水(shui)利水(shui)電工程(cheng)永久建筑物洪水(shui)標準為：

混凝(ning)土面板堆石(shi)壩設計洪水(shui)重現(xian)(xian)期(qi)為(wei)(wei)100年，校(xiao)核洪水(shui)重現(xian)(xian)期(qi)為(wei)(wei)5000年。

廠房洪水重現(xian)期(qi)(qi)為100年(nian)，校核洪水重現(xian)期(qi)(qi)為200年(nian)。

混凝土面板堆石壩按(an)(an)1級(ji)建筑(zhu)(zhu)物設計(ji)，洪水(shui)標準按(an)(an)2級(ji)建筑(zhu)(zhu)物設計(ji)；

泄水建(jian)筑物按2級建(jian)筑物設(she)計；

引水建(jian)筑(zhu)物及發電廠房按3級建(jian)筑(zhu)物設計。

古(gu)洞(dong)口電(dian)(dian)站下距新縣城所在地僅2.5公里，為(wei)了(le)保證下游人員(yuan)、財產的(de)安(an)全，同時也為(wei)自(zi)身建(jian)筑(zhu)物的(de)防洪(hong)需要，歷(li)年(nian)來(lai)設計單(dan)位中(zhong)南勘測設計院以文件(jian)報(bao)(bao)送了(le)《湖北(bei)香溪河古(gu)洞(dong)口（Ⅰ級）水利(li)水電(dian)(dian)工(gong)程(cheng)渡(du)(du)汛(xun)(xun)(xun)意見》。按(an)照(zhao)(zhao)要求，電(dian)(dian)業公司(si)每年(nian)均(jun)認(ren)真(zhen)組織編織了(le)《古(gu)洞(dong)口水庫(ku)渡(du)(du)汛(xun)(xun)(xun)方案的(de)報(bao)(bao)告》，并上報(bao)(bao)各級防洪(hong)抗旱指(zhi)(zhi)揮部(bu)門(men)。在接到報(bao)(bao)告批(pi)復后，按(an)照(zhao)(zhao)批(pi)復文件(jian)要求認(ren)真(zhen)落實(shi)人員(yuan)、機械和物資，并成(cheng)(cheng)立(li)了(le)以業主、監理、各施工(gong)單(dan)位責任人和相關(guan)人員(yuan)組成(cheng)(cheng)的(de)"古(gu)洞(dong)口工(gong)程(cheng)防汛(xun)(xun)(xun)指(zhi)(zhi)揮部(bu)"。電(dian)(dian)業公司(si)成(cheng)(cheng)立(li)了(le)"防洪(hong)搶險(xian)突(tu)擊隊"，各施工(gong)單(dan)位也成(cheng)(cheng)立(li)了(le)相應機構，落實(shi)了(le)各種措施。由于工(gong)程(cheng)按(an)渡(du)(du)汛(xun)(xun)(xun)要求完成(cheng)(cheng)了(le)工(gong)程(cheng)項目施工(gong)，各方面配合緊密(mi)，歷(li)年(nian)來(lai)沒有發生工(gong)程(cheng)防洪(hong)渡(du)(du)汛(xun)(xun)(xun)損失(shi)。

該工程由省、市兩級質量監(jian)督機構行使(shi)政府監(jian)督職(zhi)能。