Import Cross Section From HECRAS Project File

This program can import the HEC-RAS cross sections of the stream at the approach and at the bridge. At the bridge, the program will also import the bridge deck data.

Both the downstream and upstream bridge data can be imported but only the downstream bridge data is saved and used to model the ABSCOUR bridge section. The upstream bridge section will not be saved but can be used to obtain bridge upstream side low and high chord elevation and also the ground elevation at the specific station. For the upstream bridge section, use the import button on the upstream bridge data card or on the menu of the utilities unit of the program. Follow the same procedure described in the guidance below for the downstream bridge section.

For the downstream bridge section, use the Actual Section card to import the downstream bridge section using the guidance described below.

The User needs to be careful to select the appropriate HEC-RAS plan when using the import function. Before importing the HEC-RAS cross-sections into ABSCOUR Program, we recommend that the user follow the procedure outlined below to make sure that the desired HEC-RAS plan is imported into ABSCOUR:

ACTUAL BRIDGE SECTION MANNING ROUGHNESS

This is the Manning roughness n value of the left overbank, channel or the right overbank of the actual bridge section. These values can be imported from the HECRAS studies where they were used in the discharge distribution calculations. They are not used in the scour computations for the Maryland ABSCOUR method or the NCHRP 24-20 method; however, these "n" values are used in the computation of the contraction scour for the HEC-18 method "Ultimate Contraction Scour for Cohesive Soil.