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HEC RAS analysis
Input
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MATRA Project
ITC WRS: Gabriel N. Parodi
Figure 13: Final distances between the cross sections for the
LowerPoti reach.
Figure 12: Final distances between the cross sections for the
Upper reach.
Figure 14: Final distances between the cross sections for the
LowerLeft reach.
Figure 15: Final distances between the cross sections for the
LowerRight reach.
Figure 16: Final distances between the cross sections for the
Lower reach.
Left and right banks
The next step is the establishment of the left and right banks (LB and RB). By default HECRAS assumes
that the first and last station of each XS is the LB and RB respectively. This must be corrected in order to
assign the correct roughness. Keep in mind that the channel is not the area where the water was flowing
in the survey, but the area where the water could flow without producing a flooding to the overbanks.
During the XS survey, the surveyor should make specific notes on which is the beginning and end of the
channel and the overbanks. In this way the process of informing this to HECRAS is easier an accurate.
Photo 1 gives some guidelines on channel determination and roughness.
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