Soil Erosion on the American River. Brittany Tucker. American River. http://www.frankbobbio.com/photogallery/Aerial/Folsom%20Lake%20&%20Lake%20Natoma/folsom_lake__lake_natoma_aerial.htm. Purpose. Erosion studies provide scour depths
The data generated in the table and the graph do not show any particular pattern.
From the histogram it is difficult to determine whether the data is skewed or not because it is concentrated to the same area.
This data provides better grouping for such a broad analysis spectrum.
The fixed velocity case shows a normal distribution with the bulk of the samples being classified as medium erodibility.
To determine what the population mean erosion rate and standard deviation would be for a given flow velocity (1 m/s) would be, the equations below were used. With a confidence interval of 90% (α = .05), sample standard deviation (s) equal to 371.42 and sample size of 11. Assuming a normal distribution and using the t-distribution table the value of is equal to 1.812
The fact that Δμ is so close to μ is further proof that there needs to be further testing increase the number of data points for each test and that the data needs to be broken down in to more precise categories than the current erodibility levels
Very Low Erodibility IV