We also had water issues. The land here is fairly flat, but water flowing from the slightly higher neighbor yards to the north were creating some issues, along with the berm along the farm field where the water should have been going.
1. we built an elevated coop -not bc of flooding as we were ignorant of the water issue in really heavy rain when we luckily decided upon an elevated coop. The coop is about 2.5’ above the ground with a 6’ deck to accommodate a wheelbarrow for clean outs, with 3-4steps to get up.
2. We took the gutter downspouts and directed them into buried pipes that lead far away from the coop and garden. So, they no longer flowed into and near the coop.
3. We brought in 102 tons of dirt (4truckloads) to level out the area behind and south of the barn -where The garden was getting mildly flooded in heavy rain. It was more an issue that over time ground had settled and had some low pockets that collected water. So we killed the grass with the tiller, let it die completely, then the dirt arrived and was spread around. This area was then covered in mulch from a tree service company (except where raised beds were placed).
4. We added boards along the run fence, then added a huge truckload of mulch from the tree company. Note, we did NOT add any dirt here-we decided to just add lots of mulch that drains really well. When we first put it all in and it was still very “fluffy” ...the chickens seemed to be at eye level with us when on top of this fresh stuff. With a bit of time and rain, it settled quite a bit-the boards helped keep it in.
5. While the entire run is behind the barn, it still needed a roof. It took us 3 years, but the run now has a roof! It still gets rain and snow inside If it is blowing, but the bulk of the water is not entering the run.
6. We added some dirt and mulch to the north side of the yard-where the water had a tendency to flow. Then we asked the neighbor if we could remove the berm that was trapping water at back of their yard instead of flowing onto the farm field. They sort of agreed (older, very opinionated person) and we removed about 15’ of berm, and water now flows off their yard onto the farm field at a much faster rate. This means, the water doesn’t flow onto our yard from that direction, unless a really heavy rain.
7. In above #6, the neighbor won’t do anything else, so in really heavy rains, the water wants to flow across our barn driveway and threatens to enter the barn. So, we additionally dug a ditch on the other side of the barn, and buried 2 smooth walled drainage pipes to carry water to the farm field and lowered a small area of grass leading to those pipes. We want the water to leave as fast as possible.
8. The solution that makes the most sense is to put a berm on that north side of the yard-keep that water over there and let it flow onto the farm field via neighbor yard (the water comes from their yard anyway), BUT, we began that project but it angered the neighbor. Remember, older person set in their ways and opinions. Although we are completely within our rights to put in a short berm on our property, to prevent the water from entering our property (as it can flow onto farm field via neighbor yard) we removed it, and focused on those smooth wall pipes.
what we did right was to do everything in stages. Water finds the lowest point. So, each major change we waited to see the result..then adjusted. When we brought in the 102 tons of dirt (the another 25 tons for a large garden bed on the south side) it meant water had to flow differently. We altered some things on the south side of the yard too (these didn’t affect the coop area) to address the water flow. We added longer pipes to the house downspouts to direct the water to a low area that naturally drains to the farm field -so that water is not entering the yard that leads to the garden/coop area.
so, follow the water flow and asses the places water is coming from. It took us some time, but it really helped to observe and asses our options bc moving dirt is hard work!
good luck.