NDOT Custom Applications

BCAP (Broken-back Culvert Analysis Program)

This program (current Version 4.11c) was developed through research conducted at the University of Nebraska and sponsored by Nebraska Department of Transportation. It provides hydraulic analysis for steep culverts having one (Single Broken-back) or two (Double Broken-back) breaks in the vertical profile. BCAP uses the same routines as the FHWA HY-8 culvert program to determine headwater depth at the culvert entrance. BCAP then calculates the water surface profile through the entire culvert, using Gradually Varied Flow equations and boundary conditions at each vertical break. The program tests for the occurrence of a hydraulic jump in each culvert segment to help determine outlet depth and velocity.

RMA (Rational Method Application)

This program is the automated Rational Method hydrology procedure. RMA will provide peak flow calculations for an entire range (2-yr to 50-yr) of storm frequencies. The program uses the I-D-F curves. Time-of-Concentration method and Runoff Coefficients that are published in the NDOT Roadway Design Manual, for the state of Nebraska. The program automates the procedures for computing composite runoff coefficients and for interpolation of rainfall intensities using computer time-of-concentration.