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TABS-MDS
HN CARD
BED ROUGHNESS ASSIGNMENT
HN CARD
Field
Variable
Value
Description
0,C1-2
IC1
HN
Card group identifier
0,C3
IC3
b/
Option 1: global assignment
T
Option 2: assignment by material type
1
J
Option 1
User specifies the value in data field 2 for all material types ≥ J
+
Option 2
User specifies the value in data field 2 for material type J
2
XNVALU(J)
+
If the quantity in data field 2 is positive, a Manning's n value is
specified.
XESRH(J)
-
If the quantity in data field 2 is negative, a roughness height is
specified (ft or m). The roughness height is assigned a value equal to
the absolute value of the quantity given in data field 2.
NOTE: If any material type is not assigned a roughness with a HN or HNT
card, that material type will be assigned the Manning's n value
specified on the EV or EVT card which pertains to it.
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