SEFA - Computer Software System for Environmental Flow Analysis Based on the Instream Flow Incremental Methodology
Payne, Thomas R.
Jowett, Ian G.
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Several recent technological and generational changes have led to the need for improved approaches to riverine habitat modeling and more comprehensive environmental flow assessments. The Instream Flow Incremental Methodology (IFIM) described an impact assessment framework but did not create the comprehensive software which would allow for a complete implementation of that framework. SEFA, System for Environmental Flow Analysis, is new software that implements the substance of the IFIM. SEFA has been created through a collaboration of the primary creative forces behind the principal versions of existing physical habitat simulation software. Bob Milhous (PHABSIM), Ian Jowett (RHYHABSIM), and Tom Payne (RHABSIM) have contributed their considerable experience acquired through development and use of these programs, and Juan Manuel Diez Hernández provided both his experience and Spanish language capability. In a single Windows 7-compatible 32-bit program currently available on the internet, SEFA either contains or branches to legal-institutional analysis, both one and two dimensional habitat hydraulics analysis, habitat suitability criteria development, water temperature modeling, sediment transport analysis, dissolved oxygen modeling, riparian modeling, and time series analysis. This new tool and a not-for-profit technical and educational support structure will ensure continuity into the future for the critical science of instream flow evaluation and environmental flow protection.