FLOOD03466

• County: Statewide
• Basin: Statewide
• Title: Stream Channel Erosion Protection at Roadway Crossings
• Date: 8/1/1987
• Prepared By: USGS
• Floodplain - Doc Type: Floodplain Report/Masterplan

Table 1. Hydraulic properties and channel geometry of streams as a
function cf channel slope (continued).
Number Standard Minimwn Maximum
Variable of values Median Mean deviation value value
Water-surface slope. all
Discharge, Q (ft3/s) 764 0.026 598,000
Width, T (ft) 764 0.7 2,492
Area, A (ft2) 763 0.07 86,270
Wetted perimeter, P (ft) 728 6.42 .2,493
Water-surface slope, S 297 10.00368 0.00931 -0.00507 0.1013
(ft/ft) . w
Maximum depth, d (ft) 761 7.1 10.3 0.16 88.3
m
Maximum point velocity, 578 0.26 16.7
V (ft/s).
m
Average depth, d (ft) 763 4.6 6.93 7.73 0.1 54.7
a
Hydraulic radius, R (ft) 728 4.7 7.04 7.59 0.45 52.2
Average velocity, V 763 3.8 4.39 2.98 0.232 23.0
(ft/s). a
Froude number, F 763 0.313 0.356 0.234 0.027 1.71
d Id 761 1.49 1.55 0.284 1.02 3.54
m a
V IV 578 1.53 1.61 0.301 LOSS 3.51
m a
T/d 761 15.8 19.8 13.4 2.58 83.8
m
Rid 728 0.974 0.975 0.102 0.480 2.43
a
lMedian water-surface slope for 728 sites.