Study Reach.--Section 1 is 1,360 ft upstream from gage.
Gage Location.--Lat 47°45'50", long 120°39'30", in lot 8, sec.12, T.26N., R.17E., on left bank at Plain, 0.25 mile downstream from Beaver Creek, 7.5 miles downstream from Nason Creek, and 12 miles north of Leavenworth. Section 1 is 1,360 ft upstream from gage.
Drainage Area.--591 sq mi.
Gage Datum and Elevations of Reference Points.--Not available.
Stage, Discharge Measurements and Computed n-Values.--Gage heights were 12.43 ft at gage; 16.50 ft at section 1. Peak discharges was 22,700 cfs. on May 29, 1948.
Date of Observation | Discharge (ft3/s) | Average Cross Section Area (ft2) | Hydraulic Radius (ft) | Mean Velocity (ft/s) | Slope | Coefficient of Roughness n |
---|---|---|---|---|---|---|
5/29/1948 | 22687.3 | 2463.3 | 10.50 | 9.21 | 0.002358 | 0.037 |
Description of Channel.--Bed is boulders; d50 = 162 mm, d85 = 320 mm. Banks are lined with trees and bushes.