Hi Daniel,
Thanks for the clarification!
Actually, the example you provided – road sediment run-off polluting waterways – is an area of concern that CfAT have explicitly identified regarding the use of unsealed roads, so you’d be well placed to focus your attention there. Any additional negative environmental impacts that you can avoid are of course encouraged, but looking at techniques or designs that reduce sedimentation run-off is a good focus to have.
Good luck!
Rachel