River discharges 



The Noyo River drains an area of approximately 106 square miles. 

 River discharge data obtained from water discharge records during the 

 period 1952-1981 were available from a water-stage recorder gage located 

 3.5 miles east of the river mouth. Based on these data, the following river 

 discharges and recurrence intervals were projected by SPN and simulated 

 in the model. 



Discharge, Q 

 cfs 



Recurrence Interval, years 



7,000 



2 



20,000 



10 



27,000 



25 



33,000 



50 



41 ,000 



100 



Analysis of Model Data 



Relative merits of the improvement plan were evaluated by: 



a. Comparison of wave heights at selected locations in the model. 



b. Comparison of sediment tracer movement and subsequent deposits. 



c. Visual observations and wave-pattern photographs. 



In the wave-height data analysis, the average height of the highest one- 

 third of the waves, significant wave height, recorded at each gage location 

 was computed. All wave heights were then adjusted to compensate for ex- 

 cessive model wave-height attenuation due to viscous bottom friction by 

 application of Keulegan's equation. 1 From this equation, reduction of 

 wave heights in the model (relative to the prototype) can be calculated as 

 a function of water depth, width of wave front, wave period, water viscos- 

 ity, and distance of wave travel. 



G. H. Keulegan. (1950). "The gradual dampening of a progressive oscillatory wave 

 with distance in a prismatic rectangular channel," unpublished data, National Bureau of 

 Standards, Washington, DC, prepared at request of Director, WES, Vicksburg, MS, by let- 

 ter of 2 May 1950. 



Chapter 3 Tests Conditions and Procedures 



17 



