InVEST Sediment Retention Model Estimate the amount of watershet erosion and sedimentation and its economic impact on hydropower production and water quality.

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Presentation transcript:

InVEST Sediment Retention Model Estimate the amount of watershet erosion and sedimentation and its economic impact on hydropower production and water quality Two Steps: 1.Biophysical 2.Valuation

Biophysical Inputs Land Use/Land Cover Vegetation retention, land practice and management Slope Digital elevation model, slope threshold Sediment Retention Model Erosivity Based on intensity and kinetic energy of rainfall Erodibility Soil detachment and transport potential due to rainfall Watershed Areas Main and sub for point of interest and water quality analysis Reservoir Features Dead volume, lifetime of reservoir, allowed load Streams Used to determine where sediment flows to

Biophysical Outputs Potential Soil loss Calculated from USLE per sub-watershed Sediment Retention Model Sediment Exported Calculated per sub- watershed Sediment Retained Calculated per sub- watershed Used in valuation

Valuation Inputs Valuation Outputs Value of Sediment Removal for Dredging Value of Sediment Removal for Water Quality Sediment Retention Model Watershed Areas Main and sub for point of interest and water quality analysis Sediment Exported From biophysical analysis Sediment Retained From biophysical analysis Sediment Valuation Reservoir dredging costs

How Does it Work? Use the universal soil loss equation to determine potential soil loss A connectivity model determines how much soil reaches the stream Different land cover and practice can retain sediment! Details in the user’s guide Follow me to Bookmark the user’s guide Sediment retention model

Universal Soil Loss Equation Sediment retention model VariableDescription ALong term average annual soil loss RRainfall erosivity KSoil erodability LS“Slope Length” Factor CConservation Factor PPractice Factor

Connectivity Model Sediment retention model Stream Corn Forest Corn

Results Amount of sediment that reaches streams Economic impact of sedimentation Dredging Water Quality

Future Features Account for dams in removal of downstream sediment It’ll run faster Look for this in InVEST 2.3 in the near future

Do it! Run the Soil Loss tool first, then Valuation I’ll do a dry run Trainers will help you Your neighbor will help you Okay to be rowdy Sediment retention model