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Biophysical Impacts of RMS Practices

Biophysical Impacts of RMS Practices. Objectives. Assess integrated biophysical impacts of RMS practices and large-scale developments on water availability, sediment load (and groundwater recharge) Device mechanisms of incorporating RMS practices into basin IWRM planning

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Biophysical Impacts of RMS Practices

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  1. Biophysical Impacts of RMS Practices

  2. Objectives Assess integrated biophysical impacts of RMS practices and large-scale developments on water availability, sediment load (and groundwater recharge) Device mechanisms of incorporating RMS practices into basin IWRM planning Investigate up- and out-scaling options of RMS practices using sustainability criteria of satisfying downstream requirements

  3. Watersheds Climate Soil LU TI SWAT Model RMS Scenarios Sub-basins Large dams and River Junctions L-S Dev’t Scenarios WEAP Model Impact Evaluation Abay Basin Framework

  4. WEAP Modeling • Large-scale development interventions (practices): • Water control and storage infrastructures • Irrigation schemes • Hydropower plants • Environmental flows • Improved schematization for SWAT-WEAP linkages • SEI provided first feedback on the WEAP setup • Scenario definition (development + RMS) ?

  5. WEAP Schematization Dams / Reservoirs Irrigation demands River Networks

  6. SWAT-WEAP Interface SWAT sub-catchments Dams / Reservoirs Irrigation demands River Networks

  7. SWAT Modeling • SWAT initialized based on WEAP requirements and flow data availability • Landuse, soil and climate data improved • Variable sources area (VSA) concept implemented using TI • GIS Tool developed for the Soil-TI derivation • Calibration and RMS scenarios ?

  8. HRU

  9. Monthly mean Rainfall

  10. RMS Impacts on Runoff Processes Rainfall Evaporation Transpiration Canopy Evaporation Soil Evaporation Vegetation Land Surface Water Body Throughfall Infiltration Overland flow Capillary Rise Minimize: Unproductive water use Soil Stream Interflow Maximize: TARGET/Productive water use Capillary Rise Baseflow Percolation Optimize: Watershed discharge Aquifer Transfers

  11. Proportion of Rainfall Contributing to Major Hydrologic Components (Climate Forecast System Reanalysis, 31 year mean - Wet Season )

  12. SWAT Management Operations

  13. SWAT Scheduled Management Operations

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