Basin scale hydrology scenarios to explore Green Water Credits opportunities Peter Droogers, SEI
Questions to be answered What is the present delivery and use of green and blue water? What is the potential incremental green and blue water gains?
Why models? Understand current water resources Understand past water resources Options for future - technical - - socio-economic - - policy oriented Trend Past Today Future Remote Sensing Observations Analysis Statistics Models ? Data Information Knowledge Policies
Why modeling tools Modeling Understanding processes Understanding processes Scenario analysis (what, if) Scenario analysis (what, if) Green Water Credits Proof of GWC sellers delivery Proof of GWC sellers delivery e.g. less sedimentation, more blue water deliverede.g. less sedimentation, more blue water delivered Proof of GWC buyers benefits Proof of GWC buyers benefits e.g. less siltation, more hydropower generation, more relibale drinking watere.g. less siltation, more hydropower generation, more relibale drinking water
Modeling tools SWAT Supply analysis, basin scale Supply analysis, basin scale WOFOST Detailed crop analysis Detailed crop analysis WEAP Demand size allocation and benefits Demand size allocation and benefits
SWAT Channel/Flood Plain Processes Soil Water Assessment Tool
Land processes
SWAT Upper Tana
Watershed delineation Land use Soils Climate HRU Results
Watershed delineation Land use Soils Climate HRU Results
Watershed delineation Land use Soils Climate HRU Results DRSRS Land use map, 101 classes
Watershed delineation Land use Soils Climate HRU Results
Watershed delineation Land use Soils Climate HRU Results
Watershed delineation Land use Soils Climate HRU Results Hydrological Response Units = unique combinations
SWAT Results Preliminary Results Proof of Concept Initiate Discussions
Actual evapotranspiration
Actual transpiration (Green Water)
Soil evaporation
Blue Water (runoff)
Groundwater recharge
Erosion
Scenarios Enhance Green Water Use Reduce Soil Erosion
Erosion reduction (%)
Next Steps Feedback! Some additional data Suggestions for scenarios Link with other approaches (WOFOST, WEAP)
Thank You