I have a piece of my property that I've set aside for my green house and garden beds but I have issues with standing water. Most of the year the area has standing water except for the dead of winter and sometimes in the peak of summer it drys out a but but after a good rain is flooded again. My question is what is the best recommendation for drainage and also would it be possible to divert that water into some sort of storage to be used with a hose and pump to water the garden on days it may need it or if the drainage works too well?
Other than that you can swale the water that is collecting there away, to somewhere else/to be held where it fell. Man I couldn't find a good way of saying that. You can french drain it but that'd probably be a pretty big french drain. You can retention pond it. Swales and retention ponds are what we did to turn our driveway from pond to road. But I'm not sure how big your space is.
To get a better idea of what fix would work the best, we'll need a bit more information:
How big is the area? - either square feet of coverage, or how many gallons of water it holds at it's highest.
What is your climate? will the plants you want to grow need every drop of water they can get, or would that volume of water drown them in an average rainfall?
What is your soil/subsoil like - mostly clay?
Any chance the greenhouse could be uphill from this, and just have the beds down in the bottom? (in general, it's MUCH more difficult/expensive to dry out a footing/foundation than it is to dry out planting soil.)
Hopefully some other, more knowledgeable friends here can give you more firm guidance with the additional info; in my climate, I'd be happy to have an "excess water" problem!