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Arid zones --- Semiarid zones --- Rainwater --- Runoff water --- Models --- computer applications --- Water harvesting --- Runoff --- Water conservation --- erosion control --- Cultural control --- Forecasting --- Erosion control plants --- Nigeria. --- Nigeria --- Niger --- Rain-water (Water-supply) --- Rain and rainfall --- Arid regions --- Reservoir --- Swatre --- Kinematic wave model --- Runoff-depth model --- Micro-catchment design