Assessing Cumulative Effects in the South Platte River Basin Using Future Growth Scenarios
Southwest Watershed Research
2013 Annual Report
1a.Objectives (from AD-416):
Represent and model the effects of Clean Water Act-related stream-channel and stormwater management actions at a basin scale, and evaluate the cumulative basin-wide sensitivity to alternative management practices resulting from multiple permit applications and/or future landscape scenarios.
1b.Approach (from AD-416):
(1) Incorporate the ability to emulate different growth scenarios, (2) Incorporate tools and parameter sets that will support the modeling of different best management practices, (3) Provide training to EPA Regional and ORD personnel (and other agency partners) on use of the modified AGWA tool and (4) provide consultation in regard to significant nexus issues with waters of the U.S.
This project contributes to objective 3, "Develop improved watershed model components and decision support systems that more fully utilize and assimilate economic and remotely sensed data for parameterization, calibration and model state adjustment", of the in-house project. The methodology developed in a related project 5342-13610-011-06R, Spatially Integrated Environmental Modeling to Support Ecosystem Services and CWA Jurisdictional Assessment, also with the Environmental Protection Agency (EPA), will be applied to the South Platte River Basin in Colorado to assess the change in watershed response for a number of model outputs (runoff, erosion, sediment yield, etc.) as of function of future projected land cover changes (2010 to 2100 on ten-year increments) derived from several growth and immigration scenarios developed by the EPA Integrated Climate and Land Use Scenarios (ICLUS) project. In addition, a number of enhancements to AGWA were identified as part of AGWA training conducted early in the project. Several of these enhancements have been programmed into AGWA and several more are underway. They will be demonstrated during a second AGWA training that will occur in the spring of 2014. Training will be conducted at EPA Region 8 Headquarters in Denver, Colorado.