Beginner Gardening: Help with Planting Semi-Dwarf Bing Cherry Tree, 1 by Diana_K

Diana_K wrote:
It would help if you could add some pictures, but here are some general concepts:

Trench from the downspouts to the street, or, if you stop before the street then make it OK where the water will discharge onto the lawn by making a dry creek bed look, or some other feature. That much water concentrated on the lawn will wash out the soil and cause erosion.

Depending on what the grade is doing you might be able to connect several downspouts and just have on drain pipe going across the lawn. Then it would be best to take it all the way to the street.

Here is a quick sketch of these concepts. (OK, I see the colors did not come through very well)
Black outline = house
Red tree-like things = trees.
Pink = downspouts.
Light blue = original area where downspouts would flood.
Dark blue = trench, pipe below grade. Connect downspouts and take it out into the sloping lawn.
Green = sloping lawn.
Brown = street
Grey circles = cobbles that diffuse the water so it does not erode the soil. Make it look nice, like a creek bed, some plants, a boulder or two... Choose plants that are very good when the soil is wet, and are good at preventing soil erosion. Research 'Bio swale'.
Grey swirls = the unknown area. If too much water comes through, or the dry creek is not well designed this area could now erode.