Hi all,

In an attempt to quickly get an idea of the impacts of surface water separation on a number of sub-catchments, I highlighted these sub-catchments, viewed them in grid format and reduced their value in the 'Contributing Area' column by 90% (keeping 10% to account for infiltration etc.)

This didn't have the desired impact however. If I wanted to do this, would I need to reduce the values in 'Run-off area' columns?

Is there a recommended way to carry out a surface water separation assessment?

Many thanks.