Ho haella ha metsi ka har'a metsi ho boetse ho baka ts'okelo ho boleng ba bophelo le bophelo ba baahi.Hobane likhoerekhoere tsa bolulo li tlameha ho ba le lintho tse ngata tse sa tsitsang, le mefokolo ea moralo oa morao-rao oa metsi a ka tlung, ho thata ho ntša sediment ka nako, monyetla oa ho hloekisa ka nako e nyane haholo, o bonolo ho theha blockage.
Ka mokhabiso oa bolulo, batho ba bangata ba hlokomela bohlokoa ba ho hula fatše, haholo-holo ka mokhabiso oa kichineng le kamoreng ea ho hlapela fatše e na le tlhokahalo e phahameng haholo.Ho amoheloa ka kakaretso hore li-drain tsa fatše li lokela ho nka bonyane lilemo tse 10 le ho shebahala li le boemong bo phahameng. ho hloekisoa ha lisebelisoa tse loketseng tsa bohloeki ho fanoa ka khetho le ho reka, ho hloka ho tseba tsebo le bokhoni bo fokolang, ho ka tlisa mathata a mangata ho moahi, mong'a ho seng joalo, hape ho tlisa ho hloka thuso bophelong ho tloha joale ho ea pele, boleng ba bophelo bo amehang.Kahoo ka tsoelo-pele ea thepa le theknoloji, re hloka ho tsoela pele ho bokella phihlelo le ho hlahloba khetho ea li-drain tsa fatše.