Although some drains in Dar es Salaam are not connected, Hessel is still working on this to see how unconnected drains can be included in the model.
Ingawa baadhi ya mitaro/mifereji Dar es Salaam haijaungana, Hessel anaendelea kulifanyia kazi suala hili ili kuona jinsi ya kuweka mitaro ambayo haijaungana kwenye programu.