This data analysis aim at look what are the type drainage that have large number of blockage compare to other and it has been revieled that ditch are kind of drainage or waterway that is mostly blocked due to nature of its profile. so action is needed to insure that this kind of drainage ways is improved.
This evaluation try to find out what are the most common materials that are affect and influence the blockage of drainage in Zanzibar city. and as it has been shown in the chart solid waste are the major materials that occupy in most of drainage system.