Dam din Welbedacht

Dam ɗin Welbedacht madatsar ruwa ce mai nauyin siminti wadda take a Afirka ta Kudu, kuma an kafa ta a shekarar 1973. Bloemfontein ita ce birni na shida mafi girma a Afirka ta Kudu, tare da yawan jama'a kusan 300. 000. Yana cikin magudanar ruwan Kogin Modder, wanda ba shi da isasshen albarkatun ruwa don biyan buƙatun ruwa da ke ƙaruwa. Saboda haka, ana ƙara yawan ruwan da ake samu daga Kogin Caledon da ke kusa ta hanyar Tsarin Ruwa na Gwamnatin Kogin Caledon - Modder (CMRGWS). Da farko Bloemfontein ya yi niyyar karɓar ruwan Kogin Orange daga Vanderkloof Dam, amma mashigar ruwa ta tsarin canja wurin har yanzu tana nan a bangon madatsar ruwa. Duk da haka, saboda dalilai daban-daban, an aiwatar da gina ƙaramin tsari a Kogin Caledon kafin kammala madatsar ruwa ta Vanderkloof. An gina madatsar ruwa ta Welbedacht da ke Kogin Caledon a matsayin babban abin adana ruwa na CMRGWS kuma ana cire ruwa daga wannan madatsar ruwa don canjawa zuwa Bloemfontein da sauran ƙananan masu amfani a hanya. Madatsar ruwan Welbedacht madatsar ruwa ce irin ta siminti da ke kan kogin Caledon, wadda Ma'aikatar Harkokin Ruwa ta tsara kuma ta gina. Madatsar ruwan tana da yankin magudanar ruwa na kimanin 15 245. km2 tare da matsakaicin kwararar ruwa ta shekara-shekara (MAR) kusan 1210 miliyan m 3 /a (1920 zuwa 1987) kuma an kammala shi a shekarar 1973. Manufarta ita ce samar da ruwa ga birnin Bloemfontein ta hanyar bututun Caledon-Bloemfontein mai tsawon kilomita 115, wanda ke da karfin kusan 1.157. m 3 / s. Saboda yawan laka a cikin ruwa, an fara tsaftace wurin da aka tura daga madatsar ruwa ta Welbedacht a wurin tsaftace iskar gas na Welbedacht, wanda ke ƙasa da madatsar ruwa. Madatsar ruwa ta tsarkake iskar gas tana da ƙarfin 1.68 m 3 /s. An sanya babban matsayi a cikin ƙimar haɗarin madatsar ruwa. Saboda yadda ruwa ke taruwa, ƙarfin ajiyar madatsar ruwa ta Welbedacht ya ragu da sauri daga ainihin 115 miliyan m 3 zuwa kusan 16 miliyan m 3 a cikin shekaru 20 tun bayan kammala aikin. Wannan raguwar ajiyar kaya ya haifar da matsaloli wajen biyan buƙatun Bloemfontein a matakin aminci mai karɓuwa, kuma sakamakon haka, an kammala Madatsar Ruwa ta Knellpoort mai tsayin mita 50 a shekarar 1988. Manazarta