2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/06/2017 | 11:15 AM - 11:30 AM | ESTIMATING HYDROLOGIC ALTERATION AND SETTING FLOW TARGETS THAT SUPPORT BIOLOGICAL INTEGRITY AT UNGAGED SITES IN A LARGE URBANIZED REGION | 302A

ESTIMATING HYDROLOGIC ALTERATION AND SETTING FLOW TARGETS THAT SUPPORT BIOLOGICAL INTEGRITY AT UNGAGED SITES IN A LARGE URBANIZED REGION

We describe a novel approach to simulating flow regimes at ungaged sites and developing regional flow-ecology relationships in a large urbanized region. An ensemble of regionally calibrated and validated hydrological models was used to estimate current and reference flows at 572 sites where bioassessment samples have been collected in southern and central coastal California. Flow alteration was characterized as the difference in a suite of 36 flow metrics calculated from simulations of current and historic (i.e., reference) flow time-series under multiple precipitation conditions. An index of hydrologic alteration was created by selecting metrics based on their importance for predicting biological response variables in boosted regression tree models. Regionally derived, biologically based targets for flow alteration were developed to allow watershed managers to rapidly prioritize activities and conduct screenings for causal assessments at many sites across large spatial scales. Such regional tools pave the way for incorporating hydrologic management in policies and watershed planning designed to support biological integrity in streams.

C14 Hydroecology
S02 Urban streams, aquatic ecology, and stormwater engineering: How do we encourage integration, opportunities and collaboration in an era of green infrastructure innovation?
S23 Rehabilitating urban streams: perspectives from science and management

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Presenters/Authors

Brian Bledsoe (), University of Georgia, bbledsoe@uga.edu;