@FlyingNunFarm
Hopefully these make sense. The first pic is the bottom part of the drain. I cut a hole in a 1x3 or something to give the drain part support so it didn't tear the tarp. I cover my run in chicken wire so I just snipped a link to give enough space to put the pvc through, wood above chicken wire, under the tarp, then screwed the top on. It doesn't appear to leak around the tarp. I'd cut an x in the tarp and squeezed the hose end through slowly so it didn't tear. I think the screwed on cap is actually on part of the tarp.
This is the top, you can see where I messed up. I guessed about where I needed the drain, mostly based on the fact that I needed my piece of pvc to reach the edge of the run to reach the larger pipe. So if you're going to do this I suggest spraying some water on the tarp to see where it's going to lie so you can mark where you need to put the drain.
The back edge has a 12' 1x4 that goes across the run to support the chicken wire cover (red line), then I have a post about 1/2 way between the edge of the run and that 1x4 for support (red circle). Then I have a 2x4 going between the 1x4 and the edge of the run (black line), basically making a big box. Then I have a 2x4 running diagonal between the 2x4 and 1x4. I'm sure there's a MUCH better way to do all this, but most of that was done after it'd snowed and pulled down the weight of the tarp under the snow b/c I didn't consider that the tarp would get weighed down and not drain off the side.
Here you can see the post I have to support the tarp and chicken wire cover. Then the PVC elbow to the bigger pipe (it's what we had lying around). I have a lean to shed and the roof slants to the back and was pouring right into the run ever time it rained and it was a disgusted swampy mess, putting the tarp there has really helped a lot. I still get some water under there, but nothing like last year. I was planning on removing the tarp for summer, but with all the rain I think it's better off this way.
The big thing you'll need to worry about if you do this is making sure you have enough support for the weight. If your run is just posts and fencing you might need to put some wood in there. You wouldn't need as big of a tarp, you'd just need to make sure it went out far enough to catch the run off. You could use a sheet of wood for something more permanent, I'd planned on doing that, but never got around to it.
Hopefully these make sense. The first pic is the bottom part of the drain. I cut a hole in a 1x3 or something to give the drain part support so it didn't tear the tarp. I cover my run in chicken wire so I just snipped a link to give enough space to put the pvc through, wood above chicken wire, under the tarp, then screwed the top on. It doesn't appear to leak around the tarp. I'd cut an x in the tarp and squeezed the hose end through slowly so it didn't tear. I think the screwed on cap is actually on part of the tarp.
This is the top, you can see where I messed up. I guessed about where I needed the drain, mostly based on the fact that I needed my piece of pvc to reach the edge of the run to reach the larger pipe. So if you're going to do this I suggest spraying some water on the tarp to see where it's going to lie so you can mark where you need to put the drain.
The back edge has a 12' 1x4 that goes across the run to support the chicken wire cover (red line), then I have a post about 1/2 way between the edge of the run and that 1x4 for support (red circle). Then I have a 2x4 going between the 1x4 and the edge of the run (black line), basically making a big box. Then I have a 2x4 running diagonal between the 2x4 and 1x4. I'm sure there's a MUCH better way to do all this, but most of that was done after it'd snowed and pulled down the weight of the tarp under the snow b/c I didn't consider that the tarp would get weighed down and not drain off the side.
Here you can see the post I have to support the tarp and chicken wire cover. Then the PVC elbow to the bigger pipe (it's what we had lying around). I have a lean to shed and the roof slants to the back and was pouring right into the run ever time it rained and it was a disgusted swampy mess, putting the tarp there has really helped a lot. I still get some water under there, but nothing like last year. I was planning on removing the tarp for summer, but with all the rain I think it's better off this way.
The big thing you'll need to worry about if you do this is making sure you have enough support for the weight. If your run is just posts and fencing you might need to put some wood in there. You wouldn't need as big of a tarp, you'd just need to make sure it went out far enough to catch the run off. You could use a sheet of wood for something more permanent, I'd planned on doing that, but never got around to it.