SURFACE-WATER FIELD TECHNIQUES

Columbia River at Vernita, Washington n = 0.024

(Source: U.S.G.S Water Supply Paper 1849)

Site Description

Reach properties

Plan sketch and cross sections

Site photos

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Site Description

• Station name	Columbia River at Vernita, Washington
  Station number	12-4645
  Gage location	In sec. 11, T. 13 N., R. 24 E., at the Richmond ferry site, 0.5 mile north of Vernita station. Gage operated 50 miles upstream of station called Columbia River at Triniday, Wash. Section 1 is 5,000 feet upstream from cableway at Vernita gage.
  Drainage area	89,700 sq mi
  Date of flood	May 22, 1949
  Gage height	48.33 ft at Trinidad gage: 29.5 ft (different datum) at section 1.
  Peak discharge	406,000 cfs
  Computed roughness coefficient	Manning n = 0.024
  Description of channel	Bed consists of slime-covered cobbles and gravel. The straight and steep left bank is composed of cemented cobbles and gravel. The gently sloping right bank consists of cobbles set in gravel and is free of vegetation.

  Introduction Page || Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Reach Properties

• Section	Area (sq ft)	Top Width (ft.)	Mean depth (ft)	Hydraulic radius (ft)	Mean velocity (ft per sec)	Lenght (ft) between sections	Fall (ft) between sections
  1	47,100	1,800	26.2	26.16	8.65	.......	.....
  2	49,000	1,650	29.7	29.56	8.28	2,500	0.48
  3	49,600	1,760	28.2	28.10	8.17	2,500	.49

  Introduction Page || Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Plan Sketch and Cross Sections

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  Plan sketch and cross sections, Columbia River at Vernita, Washington.

  Introduction Page|| Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Site Photos