I$\text{'}$m not getting the right answer and I don't know what I am doing wrong. If you can explain step by step to help me understand how to obtain the right answer that would be awesome. This is a $3$ step problem and if I can't get the first problem right I can't get the next two right... thank you!

$1.$

Given the following parameters, using hydraulic geometry

relationships, determine the meander using the relationships

developed by either Thorne and Soar $(2001)$ or Leopold and Wolman

$(1960).$

Given:

A trapezoidal channel

Bottom width of $10$ feet

Side slopes of $2$H:$1$V

Energy slope of $0\mathrm{.}005$

Flow depth of $5$ feet

Manning's roughness $0\mathrm{.}03$

$2.$

For the stream channel in problem No$-1$ above, using the Hey and Thorne $(1986)$ hydraulic geometry relationships determine the riffle spacing and mean riffle width.

$3.$

For the stream channel in problem No$-1$ above, we need to size stone to protect the bank of the stream. Using Lane's Method determine the D$75$ stone size needed assuming a ratio of curve radius to water

surface width of $0\mathrm{.}90.$