Kulombhalo, thola izinzuzo nezinkinga zokudonswa
Context:Ukudonswa phansi kuwukukhipha izinto endaweni enamanzi. Izizathu ezingase zenziwe zokumba zihlanganisa ukuthuthukisa izindawo zamanzi ezikhona; ukuhlela kabusha indawo nezindawo zamanzi ukuze kushintshwe indlela yokukhucululwa kwamanzi, indlela yokuhamba olwandle, nokusetshenziswa kwezohwebo; ukwakha amadamu, amadamu, nezinye izinto zokulawula imifudlana nogu; nokubuyisa amaminerali ayigugu noma izilwane zasolwandle ezinokubaluleka kwezohwebo. Kuzo zonke izimo ngaphandle kwezimo ezimbalwa ukumba kwenziwa yisitshalo esikhethekile esibhukuda, esaziwa ngokuthi i-dredger.  Ukudonswa kwenziwa ezindaweni eziningi ezahlukahlukene nangezinhloso eziningi ezahlukahlukene, kepha izinhloso eziyinhloko ngokuvamile ukuthola izinto eziyigugu noma ezisetshenziswayo, noma ukudala ukujula kwamanzi okukhulu. Ama-dredge aye ahlukaniswa njengama-suction noma ama-mechanical. Izinhlelo zokudonsa zingase zisekelwe ogwini, zilethwe endaweni esekelwe ezitsheni, noma zakhiwe emikhunjini eyakhelwe injongo.  Ukudonswa phansi kunomthelela omkhulu kwezemvelo: kungaphazamisa imfucumfucu yasolwandle, kuholele ekungcolisweni kwamanzi isikhathi esifushane nesikhathi eside, kubhubhise imvelo ebalulekile yasolwandle, futhi kungakhipha ubuthi obuvela kubantu obubanjwe emfucumfucwini. Le miphumela engokwemvelo ingalimaza kakhulu izilwane zasendle zasolwandle, ingcolise imithombo yamanzi okuphuza futhi iphazamise imisebenzi yezomnotho njengokudoba.
Izinzuzo zokudonswa phansi yilezi: 1. kuthuthukisa izici zamanzi ezikhona ukuze kube nokugeleza okungcono, ukuhamba ngomkhumbi, nokusetshenziswa kwezohwebo 2. ebalulekile ekwakheni amadamu, ama-dike, nezinye izinto zokulawula imifudlana namabhishi 3. kusiza ekubuyiseni amaminerali ayigugu noma izilwane zasolwandle ezinenani lokuhweba  Izinzuzo zokudonswa kwemfucumfucu zihlobene nomthelela wazo omubi emvelweni, ngokwesibonelo: 1. kungaphazamisa imfucumfucu yasolwandle, okuholela ekungcoleni kwamanzi esikhathini esifushane nesikhathi eside 2. kungacekela phansi izimiso zemvelo ezibalulekile zasolwandle 3. ingakhipha ubuthi obuvela kumuntu obubanjwe emgodini Yonke le miphumela engenhla ingalimaza kakhulu izilwane zasolwandle, ingcolise imithombo yamanzi okuphuza futhi iphazamise imisebenzi yezomnotho njengokudoba.