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Urban flood resilience: Ramani Huria

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Ramani Huria, "Open Map" in Swahili, is a HOT Tanzania project focused on mapping Dar es Salaam to inform flood prevention plans.

Dar es Salaam is one of the fastest growing cities in Africa, with an annual population growth of over 5.7%. In 2002 there were approximately 2.5 million inhabitants, increasing to 4.4 million in 2012, and currently estimated at over 5.5 million. The population is expected to exceed 10 million by 2040, making Dar es Salaam a megacity. Urbanization is largely unplanned, and around 70% of city residents live in informal settlements. The poorest citizens who settle in these areas not only have less access to basic services, but are also the most exposed to natural hazards.

Severe flooding in December 2011 - January 2012 displaced at least 10,000 people in Dar es Salaam and caused 40 deaths. Heavy rains in April 2014 also led to widespread flooding and infrastructure damage. Climate change is expected to exacerbate these trends, as Tanzania’s coastal region is likely to experience heavier, more concentrated rainfall events. Increasing frequency of floods, landslides, and other hazards is expected to impact the most fragile, unplanned parts of the city.

In 2015 HOT began an initiative to mapping infrastructure data in various parts of Dar es Salaam. Now in its second phase, Ramani Huria 2.0, which began in 2017, is combining exposure data and flood hazard data to conduct risk analysis of potential future disasters. The team are using community mapping techniques to engage with local leaders and teach community inhabitants free, open source data collection tools from their smartphones. The data collected is enabling people across all levels of society to improve flood mitigation plans and raise awareness and resiliency to natural threats.

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Recent news from Urban flood resilience: Ramani Huria (View all news)

What we Learnt from Mapping African Megacity Dar es Salaam

Since the project kicked-off in 2015, Ramani Huria, funded by the World Bank and implemented by Humanitarian OpenStreetMap Team (HOT), has managed to map three-quarters of one of Africa’s megacities, Dar es Salaam. As a city that is particularly vulnerable to floods, the team focused their mapping on flood-prone areas, especially in informal settlements where vulnerable populations live.

Hawa Adinani — 12 December, 2019

Using Open Source Tools to Solve Routing Issues for Solid Waste Collection in Dar Es Salaam

One of the biggest difficulties in establishing an effective and efficient waste management collection and transportation system in Dar es Salaam is how long it takes to travel to Pugu dumpsite, the only officially designated solid waste dump in the city, and the best route to use. Depending on the time of day, it can take up to five or more hours for a return trip to certain points in the city. If there is a designated route for those collecting trash and taking it to the main dumping site, it will increase efficiency and planning for solid waste collectors and improve the quality and reliability of solid waste collection in the city.

Aaron Eubank — 30 August, 2019