SURFACE-WATER FIELD TECHNIQUES

Cache Creek near Lower Lake, California - n = 0.053; 0.079

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Site Description

 

Station name	Cache Creek near Lower Lake, California
Station number	11-4510
Gage location	Lat 3855'27'', long 12233'53'', in sec. 6, T. 12 N., R. 6 W., on left bank 500 ft downstream from Clear Lake Dam, 1.9 miles downstream from Copsey Creek, and 2.5 miles northeast of Lower Lake. Section 1 is 350 ft upstream from gage.
Drainage area	528 sq mi
Date of flood	January 24-25, 1951
Gage height	7.80 ft at gage, 6.30 ft at gage; 13.35 ft, 11.70 ft at section 1
Peak discharge	3,840 cfs, 1,830 cfs
Computed roughness coefficient	Manning n = 0.053; 0.079
Description of channel	Bed is composed of large angular boulders. Banks consist of exposed rock, boulders, and trees.

Introduction Page || Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Reach Properties

January 25, 1951

 

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	401	81	5.0	4.27	9.59	.......	.....
2	384	65	5.9	5.02	10.00	102	1.80
3	295	45	6.6	5.27	13.02	62	3.10

 
January 24, 1951




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	271	76	3.6	3.09	6.75	.......	.....
2	236	51	4.6	3.88	7.75	102	2.75
3	211	38	5.6	4.45	8.67	62	2.55

Introduction Page || Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Plan Sketch and Cross Sections

Introduction Page|| Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Site Photos