A river coverage used in this part:
When assigning the buffer widths to the different orders of the river network as following:
order=1, 50 ft
order=2, 100 ft
order=3, 150 ft
The river buffer like this:
When changing the buffer widths to the different orders of the river network like this:
order=1, 100 ft
order=2, 200 ft
order=3, 300 ft
The river buffer may change to like this:
Compared the first river buffer, the second river buffer is with a more-wide buffer due to assigning a double buffer widths to the different order of the river network.
In this case I don't know the relationships between the runoff buffer widths and a specific soil variable (e.g., soiltype), i.e., what values for "very slow", "slow"..., and "very rapid". I cann't define the runoff buffer widths. (Sorry)
I did the identity hydro soil hydrosoil
and found the hydrosoil grapgically looks the same as the hydro coverage but the attributes of both the hydro and hydrosoil coverages are different.
This coverage 
grapgically looks like a river coverage hydro.
Here I will model overland flow and generate a protective buffer.
When I checked LERIVER.AAT in the INFO, three items that contain information of buffer width were found:
BUF8OVERL: contains the widths of the buffer claculated for the five sections with the Nieswand et al. (1990) equation.
BUF24OVERL: contains the buffer widths calculated at 1:24,000 scale
BUFNAPA: contains the the widths of the buffer calculated in base of the NAPA County Regulations.
With the three items, three different buffer zones can be created as following:
With the BUF8OVERL:
With the BUF24OVERL:
With the BUFNAPA:
To compare their differences between them, three buffer zones have been ploted together as following:
From the plot with three buffer zones, the buffer zone with the buffer width of BUF8OVERL has the widest buffer zone (in Green), with the BUF24OVERL has a midium wide buffer (in red), while with the BUFNAPA has a narrow buffer zone (in pink).
Note: I didn't find a coverage called tinlabelc.
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