崇(chong)(chong)陽(yang)(yang)溪(xi)(xi)發源于武夷山(shan)脈崇(chong)(chong)安縣崗谷鄉(xiang)銅鈸(ba)山(shan),源流(liu)上無數溝壑(he)山(shan)澗匯(hui)成小(xiao)溪(xi)(xi),西(xi)南流(liu)向(xiang),經崗谷、吳屯,過崇(chong)(chong)安城關后即為(wei)崇(chong)(chong)陽(yang)(yang)溪(xi)(xi),流(liu)域面積,在建陽(yang)(yang)宸前水電站以上為(wei)5458平方公(gong)里。干(gan)流(liu)長(chang)162公(gong)里。崇(chong)(chong)安縣境內,有(you)西(xi)溪(xi)(xi)、坑口溪(xi)(xi)、黃柏溪(xi)(xi)、九(jiu)曲(星村)溪(xi)(xi)、梅溪(xi)(xi)、東溪(xi)(xi)等支(zhi)流(liu)匯(hui)入干(gan)流(liu);建陽(yang)(yang)縣境內有(you)崇(chong)(chong)雛溪(xi)(xi)、麻陽(yang)(yang)溪(xi)(xi)、宸溪(xi)(xi)等支(zhi)流(liu)匯(hui)入干(gan)流(liu)。徑流(liu)量極(ji)為(wei)豐富,為(wei)建溪(xi)(xi)河(he)水主要補(bu)給區。河(he)流(liu)兩岸青山(shan)連(lian)綿,峽谷和(he)寬谷相間呈串珠(zhu)形態。河(he)床底質多(duo)(duo)基巖和(he)河(he)卵石,沿溪(xi)(xi)淤積砂(sha)洲(zhou)甚多(duo)(duo)。溪(xi)(xi)谷交錯(cuo),多(duo)(duo)斷崖、懸谷。有(you)灘瀨71處。1979年,沿溪(xi)(xi)攔河(he)閘(zha)壩后,只(zhi)在閘(zha)壩間有(you)少數采(cai)砂(sha)作(zuo)業船(chuan),運輸(shu)船(chuan)絕跡。