Shape coefficient for reservoirs (model estimates if zero)

[Letícia Freire]

What equation is used to estimate the Shape "coefficient for reservoirs (model estimates if zero)" in the SWAT+?

[Maarten J. Waterloo]

Hello Leticia,

Did a search in the source code files and could not find this coefficient (supposed to be shp_co1 and shp_co2?). There are some shape parameters for pond/reservoir surface areas (eg br1, br2, bp1, bp2) that give relation res surface area / volume^C

Perhaps one of the developers can comment

Regards,

Maarten Waterloo

[Letícia Freire]

Thanks for the feedback, Maarten!
I couldn't find it in the source code either, but they are mentioned in the swat+ editor, as follows. Would they correspond to any of them (br1, br2, bp1, bp2)? 

This information is of great importance for my research with SWAT.

[Osvaldo Barresi]

I think this can give you an idea: please see attached image and code

(From res_control.f90)

!! update surface area
        if (res(jres)%flo > 0.) then
          res_wat_d(jres)%area_ha = res_ob(jres)%br1 * res(jres)%flo ** res_ob(jres)%br2
        else
          res_wat_d(jres)%area_ha = 0.
        end if