"Billy" wrote:

I just bought a resale home and found that the back yard is like a swamp.
The neighbor behind me, to the left and to the right of me are on higher
ground and slightly sloped toward my back yard, and the rear neighbor had
their lot re-graded and piped in the past to direct water my way.

Check local ordinances and state laws governing disposition of
runoff water. Here one can make a neighbor stop directing water
from their property onto yours. Their piping might have to go.

My back yard is completely flat and slightly lower, with a sloped down front
yard away from the house. Many parts of the lawn to the rear and center of
the yard bulge with water puddles after moderate rainfall, and the water
does not move.

Additionally, we have a 35x25 patio with a negative pitch
toward the home causing water to sit against the house with no place to go
but in. Last week, the water sat there like a pool almost up to my ankles!

That is your problem. Taking out a slice of it and putting in a
drain pitched the right way might solve this.


Tsu

--
To doubt everything or to believe everything
are two equally convenient solutions; both
dispense with the necessity of reflection.
- Jules Henri Poincaré