Varying the resistance across an XZ cross-section is possible by using either a relative resistance factor (R flag) or different material values (M flag). These are discussed further in the sections below.
The relative resistance value applies midway to either side of the X value (except the first and last X values where it only applies to midway to the single neighbouring X value). This is slightly different from some other 1D hydraulic modelling software that apply relative resistance values from the previous X value to the current X value or from the current to the next.
Sections of a cross-section can be “removed” by entering 1 (negative one) for a resistance value.
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