Pangani Hydrology and System Analysis Volume 1

The report documents basic hydrological information that is required to undertake the environmental flow assessments for the Pangani Basin to support the water allocation process in the basin.

The Pangani River Basin Flow Assessment (FA) Study was initiated by IUCN and the Pangani Basin Water Office (PBWO) to provide the information and tools that are required to support water resource management and water allocation decisions in the Basin. An overriding requirement of the study is to build capacity that will enable the PWBO and the Ministry of Water (MoW) to develop water management expertise in the Pangani and other basin management areas in Tanzania.

A hydrological model of the Pangani River Basin (referred to as ‘the Basin’) was configured, calibrated, and used to produce long-term flow sequences at 15 key points in the system. The work to develop and use the models was done in close collaboration with the PBWO Basin Hydrologist, Dr George Lugomela, with assistance from officials working in the regional hydrology offices of the MoW. The Basin was discretised into five main catchments that together comprise 15 sub-catchments.

The main catchments have significantly different hydrological characteristics, and it was considered important that successful calibrations be achieved at the outlets of each of the main catchments (the Ruvu, Kikuletwa, Mkomazi, Luengera and Pangani). The main catchments are shown with solid black borders in Figure E.1. The coloured subdivisions represent the 15 sub-catchments for which long-term flow sequences were developed.

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