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古(gu)洞口（Ⅰ級）水(shui)利水(shui)電工程位于湖北省(sheng)興山縣(xian)境內，壩址在長江(jiang)支流香溪河上游古(gu)夫(fu)河段的古(gu)洞口峽(xia)谷(gu)出口處，下距興山縣(xian)新縣(xian)城古(gu)夫(fu)鎮2.5公(gong)里(li)，距縣(xian)城高(gao)陽鎮18.5公(gong)里(li)，為(wei)古(gu)夫(fu)河流域水(shui)電開發的近期(qi)骨干工程。

古(gu)洞(dong)(dong)口工程泄洪兼放空洞(dong)(dong)位(wei)(wei)于大壩左岸，圓塔式(shi)進水口的(de)(de)進口檢(jian)修閘(zha)室(shi)底板高程270.0米(mi)，弧形閘(zha)門位(wei)(wei)于隧(sui)洞(dong)(dong)中部，隧(sui)洞(dong)(dong)全長(chang)421米(mi)，均采(cai)(cai)用(yong)鋼(gang)筋砼襯砌(qi)，上(shang)游有壓(ya)段(duan)長(chang)183米(mi)，襯厚0.6米(mi)，由(you)兩段(duan)方圓漸變段(duan)與檢(jian)修塔和(he)工作閘(zha)室(shi)相接(jie)。下游無壓(ya)段(duan)長(chang)175米(mi)，出口采(cai)(cai)用(yong)斜切(qie)坎挑流消能。要求(qiu)泄洪洞(dong)(dong)鋼(gang)筋砼施工必須保(bao)證質(zhi)量(liang)，滿足抗沖、抗滲功能的(de)(de)要求(qiu)，做到澆筑密實、表面平(ping)整光滑(hua)。

古(gu)洞(dong)口工(gong)程為Ⅱ等(deng)大(da)（2）型工(gong)程，主要由攔(lan)河(he)壩(ba)、泄洪(hong)建筑(zhu)物、引水系統、廠(chang)房及開(kai)關站組成。壩(ba)址處(chu)河(he)道(dao)峽窄(zhai),兩岸(an)巖坡陡竣,河(he)床覆蓋層較深。且河(he)道(dao)自峽谷(gu)出口處(chu)急轉向右(you)，右(you)岸(an)下游地勢(shi)開(kai)闊，交(jiao)通方(fang)便。根據(ju)壩(ba)址地形、地質特點、及樞(shu)紐布(bu)置(zhi)要求，泄洪(hong)建筑(zhu)物（即溢(yi)洪(hong)道(dao)和泄洪(hong)兼(jian)放空隧洞(dong)）布(bu)置(zhi)在(zai)左岸(an)，引水系統及電站廠(chang)房布(bu)置(zhi)在(zai)右(you)岸(an)。

1、泄洪兼放空隧洞(dong)

泄洪兼放(fang)空隧(sui)洞位于大壩左岸，由進水口(kou)、有壓段、工(gong)作閘室、無壓段及末端(duan)挑流鼻(bi)坎(kan)組成，全長421米(mi)，進水口(kou)底板(ban)高程為(wei)270米(mi)，校核洪水位時最(zui)大泄量1250立方(fang)米(mi)/秒(miao)。

1987年(nian)(nian)(nian)興(xing)(xing)山(shan)(shan)縣(xian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)局委(wei)托中(zhong)南勘測設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)研(yan)究院(yuan)宜昌(chang)分院(yuan)，按照國家基(ji)本建(jian)設(she)(she)(she)(she)程(cheng)(cheng)(cheng)序進(jin)行古夫(fu)河(he)流域查勘及其(qi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)發規劃，1988年(nian)(nian)(nian)上(shang)半年(nian)(nian)(nian)完成《古洞口(kou)(kou)（Ⅰ、Ⅱ級(ji)(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)樞紐工(gong)程(cheng)(cheng)(cheng)可(ke)(ke)行性(xing)研(yan)究報(bao)告(gao)(gao)(gao)》，同(tong)(tong)(tong)年(nian)(nian)(nian)12月(yue)通過(guo)(guo)湖(hu)(hu)(hu)(hu)(hu)北(bei)省(sheng)(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)廳會(hui)同(tong)(tong)(tong)省(sheng)(sheng)計(ji)(ji)(ji)(ji)(ji)(ji)委(wei)工(gong)程(cheng)(cheng)(cheng)咨詢公司對(dui)(dui)(dui)"可(ke)(ke)研(yan)報(bao)告(gao)(gao)(gao)"進(jin)行了(le)審(shen)(shen)查和評估。1989年(nian)(nian)(nian)8月(yue)9日，湖(hu)(hu)(hu)(hu)(hu)北(bei)省(sheng)(sheng)計(ji)(ji)(ji)(ji)(ji)(ji)劃委(wei)員(yuan)會(hui)下達(da)了(le)《關于興(xing)(xing)山(shan)(shan)縣(xian)古洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)項(xiang)目建(jian)議書的(de)(de)批(pi)復(fu)(fu)(fu)》。1990年(nian)(nian)(nian)5月(yue)原(yuan)能源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規劃設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)總(zong)院(yuan)又(you)對(dui)(dui)(dui)該報(bao)告(gao)(gao)(gao)進(jin)行了(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)(tong)意該報(bao)告(gao)(gao)(gao)中(zhong)提(ti)(ti)出的(de)(de)主要(yao)結論以(yi)工(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)方(fang)案(an)及省(sheng)(sheng)計(ji)(ji)(ji)(ji)(ji)(ji)委(wei)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)廳評估與審(shen)(shen)查意見。中(zhong)南院(yuan)宜昌(chang)分院(yuan)于1990年(nian)(nian)(nian)10月(yue)開(kai)始(shi)進(jin)行該工(gong)程(cheng)(cheng)(cheng)的(de)(de)初(chu)步(bu)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)工(gong)作，1991年(nian)(nian)(nian)10月(yue)提(ti)(ti)交(jiao)了(le)初(chu)步(bu)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)報(bao)告(gao)(gao)(gao)。1991年(nian)(nian)(nian)12月(yue)12日，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)下達(da)了(le)《關于湖(hu)(hu)(hu)(hu)(hu)北(bei)省(sheng)(sheng)興(xing)(xing)山(shan)(shan)縣(xian)古洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)（Ⅰ級(ji)(ji)(ji)）設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)任務書的(de)(de)批(pi)復(fu)(fu)(fu)》。1992年(nian)(nian)(nian)3月(yue)通過(guo)(guo)了(le)由(you)原(yuan)能源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規劃設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)總(zong)院(yuan)和湖(hu)(hu)(hu)(hu)(hu)北(bei)省(sheng)(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)廳聯合主持的(de)(de)審(shen)(shen)查，審(shen)(shen)查同(tong)(tong)(tong)意初(chu)步(bu)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)報(bao)告(gao)(gao)(gao)提(ti)(ti)出的(de)(de)樞紐總(zong)體布置方(fang)案(an)。同(tong)(tong)(tong)年(nian)(nian)(nian)7月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)以(yi)（1992）43號文（即(ji)《關于湖(hu)(hu)(hu)(hu)(hu)北(bei)興(xing)(xing)山(shan)(shan)古洞口(kou)(kou)（Ⅰ級(ji)(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)初(chu)步(bu)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)報(bao)告(gao)(gao)(gao)的(de)(de)批(pi)復(fu)(fu)(fu)》）批(pi)準(zhun)了(le)該工(gong)程(cheng)(cheng)(cheng)初(chu)步(bu)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)報(bao)告(gao)(gao)(gao)。1992年(nian)(nian)(nian)12月(yue)29日湖(hu)(hu)(hu)(hu)(hu)北(bei)省(sheng)(sheng)計(ji)(ji)(ji)(ji)(ji)(ji)劃委(wei)員(yuan)會(hui)下達(da)了(le)《關于轉發省(sheng)(sheng)政府批(pi)準(zhun)興(xing)(xing)山(shan)(shan)縣(xian)古洞口(kou)(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)工(gong)程(cheng)(cheng)(cheng)一九九二年(nian)(nian)(nian)新開(kai)工(gong)的(de)(de)建(jian)設(she)(she)(she)(she)通知(zhi)》。1994年(nian)(nian)(nian)7月(yue)根據(ju)興(xing)(xing)山(shan)(shan)工(gong)農(nong)業(ye)生(sheng)產對(dui)(dui)(dui)電(dian)(dian)(dian)(dian)(dian)(dian)力(li)的(de)(de)需(xu)要(yao)，特別(bie)是縣(xian)電(dian)(dian)(dian)(dian)(dian)(dian)網對(dui)(dui)(dui)調(diao)峰容量的(de)(de)需(xu)要(yao)，提(ti)(ti)出《古洞口(kou)(kou)（Ⅰ級(ji)(ji)(ji)）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)增容論證報(bao)告(gao)(gao)(gao)》。1996年(nian)(nian)(nian)11月(yue)由(you)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規劃設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)總(zong)院(yuan)的(de)(de)工(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)(she)計(ji)(ji)(ji)(ji)(ji)(ji)進(jin)行了(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)(tong)意電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)裝(zhuang)機容量36兆瓦，增至45兆瓦，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大壩由(you)2000年(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)(he)提(ti)(ti)高(gao)到5000年(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核(he)(he)。1997年(nian)(nian)(nian)3月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)部(bu)(bu)以(yi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)規設(she)(she)(she)(she)（1997）4號文對(dui)(dui)(dui)審(shen)(shen)核(he)(he)意見予以(yi)了(le)批(pi)復(fu)(fu)(fu)，并(bing)提(ti)(ti)出了(le)明確的(de)(de)審(shen)(shen)核(he)(he)意見。

古洞口工程于1993年3月(yue)(yue)(yue)1日(ri)正式開工，1999年9月(yue)(yue)(yue)9日(ri)首臺(tai)機組投產發電(dian)。2000年9月(yue)(yue)(yue)8日(ri)第二臺(tai)機組投產發電(dian)，其中泄(xie)洪兼放空隧(sui)洞施工情(qing)況如下：

泄(xie)洪(hong)洞(dong)開挖(wa)工(gong)程于(yu)1997年(nian)(nian)(nian)(nian)2月(yue)(yue)10日(ri)(ri)(ri)(ri)開工(gong)，1997年(nian)(nian)(nian)(nian)6月(yue)(yue)16日(ri)(ri)(ri)(ri)全洞(dong)貫通。檢(jian)(jian)修塔、有壓(ya)段(duan)、工(gong)作閘室段(duan)砼(tong)(tong)于(yu)1998年(nian)(nian)(nian)(nian)5月(yue)(yue)3日(ri)(ri)(ri)(ri)開工(gong)，于(yu)1999年(nian)(nian)(nian)(nian)5月(yue)(yue)11日(ri)(ri)(ri)(ri)澆(jiao)筑結束(shu)。事故檢(jian)(jian)修門于(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)開工(gong)，2000年(nian)(nian)(nian)(nian)7月(yue)(yue)安裝(zhuang)結束(shu)。工(gong)作弧門于(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)30日(ri)(ri)(ri)(ri)開工(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)20日(ri)(ri)(ri)(ri)安裝(zhuang)結束(shu)。無(wu)壓(ya)段(duan)砼(tong)(tong)于(yu)2003年(nian)(nian)(nian)(nian)12月(yue)(yue)1日(ri)(ri)(ri)(ri)開工(gong)，2004年(nian)(nian)(nian)(nian)5月(yue)(yue)4日(ri)(ri)(ri)(ri)施(shi)工(gong)結束(shu)。挑流鼻坎段(duan)砼(tong)(tong)于(yu)2000年(nian)(nian)(nian)(nian)4月(yue)(yue)5日(ri)(ri)(ri)(ri)開倉(cang)澆(jiao)筑至2000年(nian)(nian)(nian)(nian)6月(yue)(yue)3日(ri)(ri)(ri)(ri)竣(jun)工(gong)。回填、固結灌(guan)漿施(shi)工(gong)于(yu)1999年(nian)(nian)(nian)(nian)元(yuan)月(yue)(yue)15日(ri)(ri)(ri)(ri)施(shi)工(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)12日(ri)(ri)(ri)(ri)結束(shu)。

根據中華人民共和(he)國《防(fang)洪標準》GB50201-94規(gui)定(ding)，古洞口（Ⅰ級）水(shui)利水(shui)電(dian)工程永久建(jian)筑(zhu)物洪水(shui)標準為：

混凝土(tu)面板堆石壩設計(ji)洪(hong)水重現(xian)期(qi)為100年(nian)，校核(he)洪(hong)水重現(xian)期(qi)為5000年(nian)。

廠(chang)房洪水(shui)重(zhong)現(xian)期為100年，校核(he)洪水(shui)重(zhong)現(xian)期為200年。

混(hun)凝(ning)土(tu)面(mian)板堆石壩按1級建筑物(wu)設計，洪水標準按2級建筑物(wu)設計；

泄水建(jian)筑物(wu)按2級(ji)建(jian)筑物(wu)設計(ji)；

引水(shui)建筑(zhu)物及發電廠房按3級建筑(zhu)物設計(ji)。

古洞口(kou)(kou)電站下距新縣城(cheng)所(suo)在地僅2.5公(gong)里，為了保證(zheng)下游人員(yuan)、財產的(de)(de)安全，同時也為自身(shen)建筑物(wu)(wu)的(de)(de)防洪需要(yao)，歷(li)年來設計單(dan)位(wei)(wei)中南勘(kan)測設計院(yuan)以(yi)文(wen)件(jian)(jian)報送了《湖北香溪河古洞口(kou)(kou)（Ⅰ級(ji)）水利水電工(gong)(gong)(gong)程(cheng)渡(du)汛(xun)意(yi)見》。按照(zhao)要(yao)求(qiu)(qiu)，電業(ye)公(gong)司每年均認真(zhen)組織編織了《古洞口(kou)(kou)水庫渡(du)汛(xun)方案的(de)(de)報告(gao)》，并上報各(ge)級(ji)防洪抗旱指揮部(bu)門(men)。在接(jie)到(dao)報告(gao)批(pi)復后，按照(zhao)批(pi)復文(wen)件(jian)(jian)要(yao)求(qiu)(qiu)認真(zhen)落實人員(yuan)、機械和物(wu)(wu)資，并成立(li)了以(yi)業(ye)主、監理、各(ge)施(shi)工(gong)(gong)(gong)單(dan)位(wei)(wei)責任(ren)人和相關(guan)人員(yuan)組成的(de)(de)"古洞口(kou)(kou)工(gong)(gong)(gong)程(cheng)防汛(xun)指揮部(bu)"。電業(ye)公(gong)司成立(li)了"防洪搶險突擊隊"，各(ge)施(shi)工(gong)(gong)(gong)單(dan)位(wei)(wei)也成立(li)了相應機構，落實了各(ge)種措施(shi)。由于工(gong)(gong)(gong)程(cheng)按渡(du)汛(xun)要(yao)求(qiu)(qiu)完成了工(gong)(gong)(gong)程(cheng)項目施(shi)工(gong)(gong)(gong)，各(ge)方面配合緊(jin)密，歷(li)年來沒有發生工(gong)(gong)(gong)程(cheng)防洪渡(du)汛(xun)損失。

該工程由省、市兩級(ji)質量監督機構(gou)行使政(zheng)府(fu)監督職能(neng)。