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古洞口(kou)（Ⅰ級）水利水電(dian)工程(cheng)位(wei)于湖北省興(xing)(xing)山(shan)縣境內(nei)，壩址在長江支流香溪河(he)上游(you)古夫(fu)河(he)段的(de)古洞口(kou)峽谷出(chu)口(kou)處，下距(ju)(ju)興(xing)(xing)山(shan)縣新縣城(cheng)古夫(fu)鎮(zhen)2.5公里(li)，距(ju)(ju)縣城(cheng)高陽鎮(zhen)18.5公里(li)，為(wei)古夫(fu)河(he)流域水電(dian)開發的(de)近(jin)期骨干工程(cheng)。

古(gu)洞口(kou)工(gong)程泄洪兼(jian)放空(kong)洞位(wei)于大(da)壩左岸(an)，圓塔式進水口(kou)的進口(kou)檢(jian)修閘室底板高程270.0米，弧形(xing)閘門位(wei)于隧(sui)洞中部，隧(sui)洞全長421米，均(jun)采用(yong)鋼筋(jin)砼襯(chen)砌(qi)，上游(you)有壓(ya)段(duan)(duan)長183米，襯(chen)厚(hou)0.6米，由兩(liang)段(duan)(duan)方圓漸(jian)變段(duan)(duan)與(yu)檢(jian)修塔和工(gong)作(zuo)閘室相接。下游(you)無壓(ya)段(duan)(duan)長175米，出口(kou)采用(yong)斜切(qie)坎挑流消能。要求(qiu)泄洪洞鋼筋(jin)砼施工(gong)必須保(bao)證質量(liang)，滿足抗沖(chong)、抗滲功能的要求(qiu)，做到澆筑密(mi)實、表面平(ping)整光滑。

古洞口工程(cheng)為Ⅱ等(deng)大（2）型(xing)工程(cheng)，主要由攔河壩、泄洪建筑(zhu)物(wu)、引(yin)(yin)水(shui)(shui)系(xi)統、廠房及開(kai)關(guan)站組(zu)成。壩址處河道峽窄,兩岸(an)巖坡陡竣,河床覆蓋(gai)層(ceng)較深。且河道自峽谷出(chu)口處急(ji)轉(zhuan)向右(you)，右(you)岸(an)下游地(di)勢開(kai)闊，交通(tong)方(fang)便。根據壩址地(di)形、地(di)質特(te)點、及樞紐布(bu)置(zhi)要求，泄洪建筑(zhu)物(wu)（即溢洪道和泄洪兼放空隧洞）布(bu)置(zhi)在(zai)(zai)左岸(an)，引(yin)(yin)水(shui)(shui)系(xi)統及電站廠房布(bu)置(zhi)在(zai)(zai)右(you)岸(an)。

1、泄洪兼放空隧洞

泄洪(hong)兼(jian)放空隧洞(dong)位于大壩左(zuo)岸，由(you)進水口、有壓段、工作閘(zha)室、無(wu)壓段及末端挑流鼻(bi)坎組成，全長(chang)421米(mi)，進水口底板高程為270米(mi)，校核洪(hong)水位時最大泄量1250立方米(mi)/秒。

1987年興(xing)山(shan)(shan)縣水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)局委(wei)托中(zhong)(zhong)南勘測設(she)計(ji)(ji)研究(jiu)院(yuan)宜昌分(fen)院(yuan)，按(an)照國家基本建設(she)程(cheng)(cheng)(cheng)序(xu)進(jin)(jin)行古(gu)(gu)(gu)(gu)夫河流(liu)域查(cha)勘及其水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)開(kai)發(fa)規(gui)劃，1988年上半年完成《古(gu)(gu)(gu)(gu)洞(dong)口(kou)（Ⅰ、Ⅱ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)樞(shu)紐(niu)工(gong)程(cheng)(cheng)(cheng)可(ke)行性(xing)研究(jiu)報(bao)告(gao)》，同(tong)(tong)年12月(yue)通(tong)過湖(hu)北省水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)廳(ting)會同(tong)(tong)省計(ji)(ji)委(wei)工(gong)程(cheng)(cheng)(cheng)咨(zi)詢(xun)公司對(dui)(dui)"可(ke)研報(bao)告(gao)"進(jin)(jin)行了(le)(le)(le)審(shen)(shen)查(cha)和評(ping)估(gu)。1989年8月(yue)9日，湖(hu)北省計(ji)(ji)劃委(wei)員會下達了(le)(le)(le)《關于(yu)(yu)興(xing)山(shan)(shan)縣古(gu)(gu)(gu)(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)站(zhan)項目建議書的(de)(de)(de)(de)(de)批(pi)(pi)復(fu)(fu)(fu)》。1990年5月(yue)原能(neng)源部(bu)(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)規(gui)劃設(she)計(ji)(ji)總(zong)(zong)院(yuan)又(you)對(dui)(dui)該報(bao)告(gao)進(jin)(jin)行了(le)(le)(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)意該報(bao)告(gao)中(zhong)(zhong)提(ti)(ti)(ti)出的(de)(de)(de)(de)(de)主要(yao)結(jie)論以工(gong)程(cheng)(cheng)(cheng)設(she)計(ji)(ji)方案及省計(ji)(ji)委(wei)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)廳(ting)評(ping)估(gu)與審(shen)(shen)查(cha)意見(jian)(jian)。中(zhong)(zhong)南院(yuan)宜昌分(fen)院(yuan)于(yu)(yu)1990年10月(yue)開(kai)始進(jin)(jin)行該工(gong)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)(de)初(chu)(chu)(chu)步(bu)設(she)計(ji)(ji)工(gong)作，1991年10月(yue)提(ti)(ti)(ti)交(jiao)了(le)(le)(le)初(chu)(chu)(chu)步(bu)設(she)計(ji)(ji)報(bao)告(gao)。1991年12月(yue)12日，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)下達了(le)(le)(le)《關于(yu)(yu)湖(hu)北省興(xing)山(shan)(shan)縣古(gu)(gu)(gu)(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)站(zhan)（Ⅰ級）設(she)計(ji)(ji)任務書的(de)(de)(de)(de)(de)批(pi)(pi)復(fu)(fu)(fu)》。1992年3月(yue)通(tong)過了(le)(le)(le)由原能(neng)源部(bu)(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)規(gui)劃設(she)計(ji)(ji)總(zong)(zong)院(yuan)和湖(hu)北省水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)廳(ting)聯合主持的(de)(de)(de)(de)(de)審(shen)(shen)查(cha)，審(shen)(shen)查(cha)同(tong)(tong)意初(chu)(chu)(chu)步(bu)設(she)計(ji)(ji)報(bao)告(gao)提(ti)(ti)(ti)出的(de)(de)(de)(de)(de)樞(shu)紐(niu)總(zong)(zong)體(ti)布(bu)置方案。同(tong)(tong)年7月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)以（1992）43號(hao)文（即《關于(yu)(yu)湖(hu)北興(xing)山(shan)(shan)古(gu)(gu)(gu)(gu)洞(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)工(gong)程(cheng)(cheng)(cheng)初(chu)(chu)(chu)步(bu)設(she)計(ji)(ji)報(bao)告(gao)的(de)(de)(de)(de)(de)批(pi)(pi)復(fu)(fu)(fu)》）批(pi)(pi)準了(le)(le)(le)該工(gong)程(cheng)(cheng)(cheng)初(chu)(chu)(chu)步(bu)設(she)計(ji)(ji)報(bao)告(gao)。1992年12月(yue)29日湖(hu)北省計(ji)(ji)劃委(wei)員會下達了(le)(le)(le)《關于(yu)(yu)轉發(fa)省政府批(pi)(pi)準興(xing)山(shan)(shan)縣古(gu)(gu)(gu)(gu)洞(dong)口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)站(zhan)工(gong)程(cheng)(cheng)(cheng)一(yi)九(jiu)九(jiu)二年新開(kai)工(gong)的(de)(de)(de)(de)(de)建設(she)通(tong)知(zhi)》。1994年7月(yue)根(gen)據興(xing)山(shan)(shan)工(gong)農(nong)業生產對(dui)(dui)電(dian)(dian)力(li)的(de)(de)(de)(de)(de)需要(yao)，特(te)別是縣電(dian)(dian)網對(dui)(dui)調峰容(rong)量(liang)的(de)(de)(de)(de)(de)需要(yao)，提(ti)(ti)(ti)出《古(gu)(gu)(gu)(gu)洞(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)工(gong)程(cheng)(cheng)(cheng)電(dian)(dian)站(zhan)增(zeng)容(rong)論證報(bao)告(gao)》。1996年11月(yue)由水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)規(gui)劃設(she)計(ji)(ji)總(zong)(zong)院(yuan)的(de)(de)(de)(de)(de)工(gong)程(cheng)(cheng)(cheng)設(she)計(ji)(ji)進(jin)(jin)行了(le)(le)(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)意電(dian)(dian)站(zhan)裝(zhuang)機容(rong)量(liang)36兆(zhao)瓦(wa)，增(zeng)至45兆(zhao)瓦(wa)，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大壩由2000年一(yi)遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校(xiao)核提(ti)(ti)(ti)高到(dao)5000年一(yi)遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校(xiao)核。1997年3月(yue)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)(li)(li)(li)(li)部(bu)(bu)(bu)以水(shui)(shui)(shui)(shui)(shui)(shui)(shui)規(gui)設(she)（1997）4號(hao)文對(dui)(dui)審(shen)(shen)核意見(jian)(jian)予(yu)以了(le)(le)(le)批(pi)(pi)復(fu)(fu)(fu)，并提(ti)(ti)(ti)出了(le)(le)(le)明確的(de)(de)(de)(de)(de)審(shen)(shen)核意見(jian)(jian)。

古洞口工(gong)程于(yu)1993年(nian)3月1日(ri)正式開工(gong)，1999年(nian)9月9日(ri)首臺機組投(tou)產發電。2000年(nian)9月8日(ri)第二臺機組投(tou)產發電，其中(zhong)泄洪兼放空隧洞施(shi)工(gong)情況如下：

泄洪洞開挖工(gong)(gong)(gong)程(cheng)于(yu)1997年(nian)(nian)2月(yue)(yue)(yue)10日(ri)(ri)(ri)開工(gong)(gong)(gong)，1997年(nian)(nian)6月(yue)(yue)(yue)16日(ri)(ri)(ri)全洞貫通。檢(jian)修塔、有(you)壓(ya)段、工(gong)(gong)(gong)作閘室段砼于(yu)1998年(nian)(nian)5月(yue)(yue)(yue)3日(ri)(ri)(ri)開工(gong)(gong)(gong)，于(yu)1999年(nian)(nian)5月(yue)(yue)(yue)11日(ri)(ri)(ri)澆筑結(jie)束(shu)。事故檢(jian)修門于(yu)1998年(nian)(nian)11月(yue)(yue)(yue)開工(gong)(gong)(gong)，2000年(nian)(nian)7月(yue)(yue)(yue)安(an)裝(zhuang)結(jie)束(shu)。工(gong)(gong)(gong)作弧門于(yu)1998年(nian)(nian)11月(yue)(yue)(yue)30日(ri)(ri)(ri)開工(gong)(gong)(gong)，1999年(nian)(nian)5月(yue)(yue)(yue)20日(ri)(ri)(ri)安(an)裝(zhuang)結(jie)束(shu)。無壓(ya)段砼于(yu)2003年(nian)(nian)12月(yue)(yue)(yue)1日(ri)(ri)(ri)開工(gong)(gong)(gong)，2004年(nian)(nian)5月(yue)(yue)(yue)4日(ri)(ri)(ri)施(shi)工(gong)(gong)(gong)結(jie)束(shu)。挑流鼻坎段砼于(yu)2000年(nian)(nian)4月(yue)(yue)(yue)5日(ri)(ri)(ri)開倉澆筑至(zhi)2000年(nian)(nian)6月(yue)(yue)(yue)3日(ri)(ri)(ri)竣(jun)工(gong)(gong)(gong)。回填、固(gu)結(jie)灌漿(jiang)施(shi)工(gong)(gong)(gong)于(yu)1999年(nian)(nian)元月(yue)(yue)(yue)15日(ri)(ri)(ri)施(shi)工(gong)(gong)(gong)，1999年(nian)(nian)5月(yue)(yue)(yue)12日(ri)(ri)(ri)結(jie)束(shu)。

根據(ju)中華人民(min)共(gong)和國《防洪(hong)(hong)標準(zhun)》GB50201-94規定(ding)，古洞口(kou)（Ⅰ級(ji)）水(shui)利水(shui)電工程(cheng)永久建筑物(wu)洪(hong)(hong)水(shui)標準(zhun)為：

混凝土面板堆石壩設計洪水(shui)(shui)重(zhong)現(xian)期為100年，校(xiao)核洪水(shui)(shui)重(zhong)現(xian)期為5000年。

廠房洪水重現(xian)期為(wei)100年，校核洪水重現(xian)期為(wei)200年。

混凝土面(mian)板堆石壩按(an)1級(ji)建筑物(wu)設(she)計(ji)，洪水(shui)標(biao)準按(an)2級(ji)建筑物(wu)設(she)計(ji)；

泄(xie)水建筑(zhu)物按2級建筑(zhu)物設計；

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

古(gu)洞口(kou)(kou)電(dian)(dian)站下距新縣(xian)城所在(zai)地僅2.5公里(li)，為(wei)了(le)(le)保證下游人(ren)員(yuan)、財產的安全(quan)，同時也(ye)為(wei)自(zi)身建(jian)筑(zhu)物的防(fang)(fang)洪(hong)(hong)需要，歷年(nian)來(lai)設(she)計單位(wei)(wei)(wei)中南勘測設(she)計院以文件報(bao)送了(le)(le)《湖(hu)北香溪(xi)河古(gu)洞口(kou)(kou)（Ⅰ級）水利水電(dian)(dian)工(gong)程(cheng)渡汛(xun)意(yi)見》。按(an)照要求，電(dian)(dian)業(ye)公司每年(nian)均認(ren)真組織(zhi)編織(zhi)了(le)(le)《古(gu)洞口(kou)(kou)水庫(ku)渡汛(xun)方案的報(bao)告》，并上報(bao)各(ge)級防(fang)(fang)洪(hong)(hong)抗旱(han)指(zhi)揮部門。在(zai)接到(dao)報(bao)告批(pi)復后，按(an)照批(pi)復文件要求認(ren)真落實(shi)人(ren)員(yuan)、機(ji)械和物資，并成立了(le)(le)以業(ye)主、監理、各(ge)施工(gong)單位(wei)(wei)(wei)責任人(ren)和相(xiang)關人(ren)員(yuan)組成的"古(gu)洞口(kou)(kou)工(gong)程(cheng)防(fang)(fang)汛(xun)指(zhi)揮部"。電(dian)(dian)業(ye)公司成立了(le)(le)"防(fang)(fang)洪(hong)(hong)搶險突(tu)擊隊"，各(ge)施工(gong)單位(wei)(wei)(wei)也(ye)成立了(le)(le)相(xiang)應機(ji)構，落實(shi)了(le)(le)各(ge)種措施。由于工(gong)程(cheng)按(an)渡汛(xun)要求完成了(le)(le)工(gong)程(cheng)項目施工(gong)，各(ge)方面配合緊密，歷年(nian)來(lai)沒(mei)有發生工(gong)程(cheng)防(fang)(fang)洪(hong)(hong)渡汛(xun)損(sun)失。

該工程由省、市(shi)兩(liang)級質量監督(du)機構行使政府監督(du)職能。