FLOOD03929

• County: Statewide
• Community: Nationwide
• Basin: Statewide
• Title: Generalized Computer Program Fluvial-12 Mathematical Model for Erodible Channels Users Manual
• Date: 8/1/1986
• Prepared By: Howard H. Chang, Ph.D., P.E.
• Floodplain - Doc Type: Educational/Technical/Reference Information

W.S.ELE.V
WIDTH
DEPTH

o
V
SLOPE
DSO
OS
FR
N

SED. YIElD

WSEL
Z

Y

DZ
'lDZ

water-surface elevation in ft or m
Surface width of channel flow in ft or m
Depth of flow measured from channel invert to the water-
surface in ft or m
Discharge of flow in cfs or cr(lS
Mean velocity of a cross-section in fps or mps
Energy gradient
Median size or dSO of sediment load in am
Bed-material discharge for all size fractions in cfs or ems
Froude number at a cross section
Manning I S roughness coefficient
Bulk volume of sediment having passed a cross section since
beginning of simulation, in cubic yards or cubic meters
Water-surface elevation, in ft or m
Vertical coordinate (elevation) of a point on channel boundary
of a cross-section, in ft or m
Horizontal coordinate (station) of a point on channel boundary
of a cross-section, in ft or m
Change in elevation during the current time step, in ft or m
Total or accunulated change in elevation, in ft or m

III. IMPORI'ANT MESSAGES FOR INPUT PREPARATION

1. The canplting time of this program is sensitive to the reach length
between two adjacent cross sections, OX. Very snall reach lengths which may
result in excessive canplting time should be avoided. In HEC-2, a down-
stream section and an upstream section are usually used at each bridge cro-
ssing, but these two sections should be combined into one, if possible, for
the FLUVIAL application.

2. The GR points used to define the ground profile should be selected
to provide an accurate definition of the initial profile. As such, suffi-
cient points should be used for each cross section. Also, large spacing
between adjacent points should be avoided even if there is no difference in
33