Ngo-Agasti, izinga lokukhula kwemboni yensimbi ephansi yehla, elithintekayo ukukhula kokukhishwa kwensimbi kanye nokuthuthukiswa kohwebo, izintengo zensimbi zehla ngenyanga ngenyanga.Ngo-September, njengoba intengo kaphethiloli oluhlaza iphakama, amanani ensimbi abuyiselwe, kulindeleke ukuthi aphuze asazobonisa umkhuba wokuguquguquka okuncane.