INVESTIGATING SURFACE DRAINAGE PROBLEM OF ROADS IN KHARTOUM STATE

Poor drainage contributes immensely to pavement deterioration and subsequently causing increased annual repair expenditure. The investigation is conducted to provide extensive diagnosis to point out the causes of roads problems associated with poor surface drainage and provides possible mitigation measures to overcome the problem in Khartoum state. Some cases of existing roads in different regions in Khartoum state, suffered from severe distresses and damages due to poor drainage were studied. The method used to assess the existing drainage system of the studied roads is field survey. Based on field observations, the drainage structures suffered from blockage with dumping wastes, inadequate inlets and outlet channels, failure of side walls and bed erosion.