Comprehensive Mapping of the Weruweru Sub-Catchment: A Step Towards Sustainable Water Management
Written by Elia Dominic
The Weruweru River sub-catchment is a critical hydrological system in Tanzania, supporting agricultural productivity, domestic water use, and ecological sustainability. The area encompasses an intricate network of irrigation furrows and abstraction points, which have been operational for decades. The Weruweru Furrows is an ancient structure constructed by early settlers; the furrow has played a crucial role in facilitating irrigation and supporting agriculture in the area. Understanding its historical context is vital to appreciating its role in the community and guiding future interventions.
OMDTZ partnering with GIZ NatuRes Programme, initiated a comprehensive mapping of the Weruweru furrows to provide valuable information about its current state, potential challenges and opportunities for improvement.
Mapping the Weruweru Furrow offers valuable insights into its current condition, including structural integrity, water flow, and areas of degradation. This detailed assessment helps identify specific problem areas, such as blockages, leaks, and erosion, enabling targeted repairs and maintenance. Accurate mapping also plays a key role in resource management by ensuring the equitable distribution of water among stakeholders. Furthermore, comprehensive maps provide a solid foundation for planning upgrades, expansions, and conservation efforts, supporting the sustainable development of this vital resource.
We have developed an overview map of the Weruweru sub catchment, supported by detailed GIS data and analysis. This includes identifying hydrological features and agricultural infrastructure such as irrigation furrow systems. OpenMap Development Tanzania (OMDTZ) team applied participatory data collection techniques with the Weruweru Water Users Association (WUA) members, who played a key role in ensuring the “buy-in” of the mapping exercise and permitting data collection within specific villages
The mapping process involved several key steps to ensure accuracy and relevancy, It begins with measuring of the furrow, including its width, length, and height to assess its capacity and structural conditions. Data is then collected using android phones ( as GPS devices), satellite imagery, and traditional surveying techniques to capture information on the sub-catchment geography, hydrology, and land use. This data is analyzed to identify patterns, highlight areas of concern, and explore potential improvements. Community engagement is integral to the process, incorporating local knowledge and ensuring the maps address their needs. Finally, detailed maps and reports are created, providing valuable resources for policymakers, engineers, conservationists, and the local community.
Mapping the geotraces of the Weruweru irrigation furrows involves creating a detailed visual representation of the water flow connections between various furrows in the system. The furrows included in the mapping are Makeresho, Kombo, KNCU, TACRI, Gikas, Two Bridges, Msaa, Nsanya, Lambo, Mkufi, Kimashuku, Msokiwa, Foo foo, JB, Silverdale, and Makuru.
These geotraces illustrate the pathways through which water moves, providing critical insights into the distribution network. Accurate mapping is essential for optimizing irrigation practices, ensuring equitable water distribution, and addressing potential inefficiencies. The process utilizes tools like OpenData Kit (ODK) and Geographic Information Systems (GIS) to precisely plot the locations and interconnections of these furrows, laying the groundwork for improved water resource management.
Comprehensive mapping of the Weruweru sub-catchment is a vital step toward sustainable water management and the preservation of this critical resource. By assessing its current state, identifying challenges, and involving local communities, we can ensure the sub-catchment continues to support agricultural activities and improve the quality of life for generations to come. Achieving this vision requires collaboration, investment, and a shared commitment to safeguarding this essential ecological system. We call on stakeholders, policymakers, and community members to join us in this effort, working together to enhance the sub-catchment benefits and secure its future.
