Modeling Flood & Drought Scenario for Water Management in Porali River Basin, Balochistan

Recent history shows that floods have become a frequently occurring disaster in Balochistan, especially duringmonsoon season. Two rivers, river Porali and river Kud overflows, inundating its banks and causing destruction to cultivated landand property. This study is an attempt to identify flood prone areas of Porali river basin for future flood scenario and proposepossible reservoir locations for excess flood water storage. Computer-based models Hydrological SimulationProgram-FORTRAN (HSPF) and HEC-river analysis system (HEC-RAS) are used as tools to simulate existing and future floodand drought scenarios.Models are calibrated and validated using data from 3 weather stations, namelyWadh, Bela, and Uthal andstream flow data from two gauging stations. The highest and the lowest 10 years of precipitation data are extracted, from historicdataset of all stations, to attain future flooding and drought scenarios, respectively. Flood inundation map is generatedhighlighting agricultural prone land and settlements of the watershed. Using Digital ElevationModel (DEM) and volume of watercalculated from the flood scenario, possible locations for reservoirs are marked that can store excess water for the use in droughtyears. Flow and volume of water has also been simulated for drought scenario. Analyses show that 3 × 109m3 of water availabledue to immense flooding that is sufficient for the survival for one drought year, as the volume of water for latter scenario is 2.9 ×108m3