HEC-RAS User's Manual Hydraulic Design (HD) Calculators Riprap Calculator User's Manual (27Aug 2021) Current: Ongoing Work and Wish List PDF Download PDF Download page Ongoing Work and Wish List. Current page All pages Ongoing Work and Wish List HEC is working on the following developments for future versions: Add the Maricopa County Riprap Design Approach Add the Blench Scour Calculation Automatically read bankfull hydraulics for Neill equation by selecting a second HEC-RAS profile Automate the Radius of Curvature Calculation in RASMapper Import Cross-Section Averaged 2D Results Directly from a User Selected Transect ×