Ivalve yesango lokutywina ethambileyo, ekwaziwa ngokuba yivalve yesango lesihlalo esilastiki, sisivalufa esisetyenziswa ukudibanisa umbhobho ophakathi kunye nokutshintsha kwiprojekthi yokonga amanzi.Ulwakhiwo lwevalve yesango lokutywina oluthambileyo lwenziwe sisitulo sevalvu, isigqubuthelo sevalvu, ipleyiti yesango, indlala, isiqu, ivili lesandla...
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