Ecologically aware design of waterway-encapsulating structures.

978-1-62260-438-8PDFTech Reporthttp://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=3157&context=jtrpFHWA/IN/JTRP-2016/21SPR-3814CulvertsRegulationLife cycle costingAquatic lifeBridge waterwaysUnited StatesIndianaPurdue University. Joint Transportation Research ProgramLyn, Dennis A.Sangwan, NikhilPurdue University. Joint Transportation Research ProgramIndiana. Dept. of TransportationUS Transportation CollectionAquatic organism passage (AOP) in waterways-encapsulating structures, particularly culverts, is of growing concern to environmentalregulatory agencies, and the Indiana Department of Transportation (INDOT) is seeking systematic responses to this concern in thehydraulic design of such structures. This study reviews design approaches to enhance or accommodate aquatic organism passagethrough culverts, and proposes a simplified design procedure that requires less data input and analysis, and yet results in a structurecomplying with the current regional general permit (RGP) conditions. It also makes as much use of already existing INDOT standardspecifications for riprap and coarse aggregates that would be as backfill material to form a stable bed within the culvert. The simplifiedprocedure is intended for new larger structures for which a culvert bed needs to be installed, and for expected Indiana conditions oflow-gradient (