Filter strip in .ops

[유지은]

Hello all,

I'm using ArcSWAT to figure out the effect of filter strip to control nonpoint source.

I changed the value(VFSRATIO, VFSCON, VFSCH) of filter strip in .ops file and found some differences in the presence and absence of the filter strip.

However, there was no difference in the result value even if the ratio was changed.

For example, the output of the TOT_N in .rch file is the same when i put 10 and 50 to the  VFSRATIO. 

Do you have any solution? I want to find the effective width of filter strip for reducing non-point source.

Thanks,

Jieun

[Jim Almendinger]

Filter strips are most effective on particulates (sediment and sediment-bound P).  They don't remove much NO3.  So likewise I think SWAT filter strips remove sediment and sediment-bound P, but do not capture any N. 

-- Jim

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[nhn...@gmail.com]

 Hello,

I have the same situation for the pesticide outputs. I tried many filter widths, but there is no change in pesticide outputs, even in the sorbed pesticides. Filter strips mainly effective on sediment, but it should show some effects on sediment bound pesticides, is not it? Or I have missed anything while set-up model..

Thank you,

Nihan