“Hydrologic Engineering Centers River Analysis System (HEC-RAS)” means a hydraulic modeling program developed by the US Army Corps of Engineers to perform one-dimensional hydraulic calculations for natural and constructed channels, which can be downloaded for free at http://www.hec.usace.army.mil/software/hec%2Dras/.

Source. #9343, eff 1-1-09; ss by #12342, eff 8-15-17 (formerly Env-Wq 1502.27); ss by #14472, eff 1-19-26, EXPIRES: 1-19-36 (formerly Env-Wq 1502.31)