Presenting the hydrological research carried out in the Migina
catchment (260 km2), Southern Rwanda with the objective to explore
the hydrological trends and climate linkages for catchments in
Rwanda (26,338 km2), and to contribute to the understanding of
dominant hydrological process interactions. Different
Hydro-meteorological instrumentations have been installed for
several months in the Migina catchment and measurements have been
carried out. The trend analysis is based on Mann-Kendall (MK) test
and Pettitt test on times series data varying from 30 to 56 years
before 2000. The hydrometric data and modern tracer methods is used
for hydrograph separation and show that subsurface runoff is
dominating the total discharge even during rainy seasons at
Cyihene-Kansi and Migina sub-catchments, respectively. Further, a
semi-distributed conceptual hydrological model HEC-HMS is applied
for assessing the spatio-temporal variation of water resources in
the Migina catchment. The model results are compared with tracer
based hydrograph separation results in terms of the runoff
components. The model performed reasonably well in simulating the
total flow volume, peak flow and timing as well as the portion of
direct runoff and baseflow.
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