First we try to visualize what are the major threat toward the drainage blockage in Zanzibar, and we realize Dumping site, water body and poor building plan are major reasons as shown in the map above.

Our next visualization we try to portray type of materials that weakening and influence drainage blockage system in Zanzibar, the result were the solid waste to be a common blockage material type that occupy in most of drainage as shown into a maps below.

Our last visualization look at the impact that could happen if drainage system fail, and as you can see it try to give picture on how far does people houses are going to be affected when drainage become block.