I'm no expert, but I believe there's an app for that. You need a topo map for it to work.

Bear in mind that slope is important. A gentle slope will reduce runoff, as the water is more likely to seep into the ground. A steep slope increases runoff. And grassy fields slow the runoff much more than trees.

There are people here who really are experts in this stuff, and I'm sure they'd be willing to help. Topo map is a must!


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160