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 6. Changes in channel geometry of Sacramento River at cross section 6
near Ord Bend, CalifomilL, 1972-84, for a discharse of 10,000 fts/s.
(Winter peak discharge is annua). peak discharge for winter preceding survey. Tha1wes
movement is from initial point, based on location in 1972]
Winter Lateral Cross Hydrau- Width Kean Maxi-
Survey pesk dis- movement sectional lic at water depth, 10_ Ratio,
date chsrse. Q of thal- area. A radius, surface, d depth, d /d
(fts/s) (ft) (ft2) R (ft) T (ft) a d (ft) .. a
weg (ft) ID.~
10-17-72 95,800 0 3,278 11.7 273 12.0 19.7 1.64
8-20-73 98,500 21 3,071 8.2 372 8.3 14.6, 1.77
9-17-74 136,000 77 2,015 8.3 602 3.3 11.5 3.44
8-24-76 27,300 73 2,294 3.9 585 3.9 11.1 2.83
6-27-78 121,000 83 3,319 4.4 757 4.4 12.1 2.76
8-16-79 58,000 84 3,327 4.5 733 4.5 12.2 2.69
10-10-80 124,000 111 2,927 6.1 475 6.2 17.6 2.86
9-3-81 67,000 91 2,711 6.1 -445 6.1 14.8 2.43
8-5-82 102,000 95 4,565 9.9 452 10.1 18.4 1.82
8-10-83 157,000 107 4,106 6.1 670 6.1 18.7 3.05
8-07-84 129,000 100 3,742 5.5 667 5.6 18.5 3.30
Hean 3,214 6.34 548 6.41 15.4 2.60
Standard deviation 746 2.61 156 2.70 3.30 0.62
Range in data as a +42.0 +84.5 +38.1 +87.2 +27.9 +33.8
percentage of the mean1 -37.3 -47.9 -50.2 -48.5 -27.9 -36.9
IThe means of the percentage range in data for the six hydraulic factors (A, R, T,
d , d , and d /d ) are +52.3 and -41.5 percent.
a .. m s

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