Due to the fact my GC was an idiot, I have a drainage isseue on one side of
my house. The slope is excessive, and when it rains the water just sits.
The easy answer is to change the elevation using dirt, but that would result
in piling 2' of dirt up against a wood fence, which would lead to premature
rotting. Other issue is that irrigation lines are trenched parallel to the
fence. So, need to raise elevation without impacting fence or irrigation
Only answer I can think of is to build retaining wall length of lot line,
and backfill with dirt to change elevation. Then drive 1/2' rebar down 24'
or so into the ground on each end of the base line of timbers (4x8 pt
posts). To avoid hitting irrigation lines, I would not be able to trench the
first course of timbers more than 3' or so under grade.
Do i need to put any kind of footing under the first level of timbers, like
sand? It will probably take 3-4 courses of timbers to get the elevation up
high enough to channel the water correctly. I know a base will make it more
level but is it necessary for stability?
I am afraid the rebar will puncture the irrigation lines. Except for
exposing the lines, is there a way to determine exactly where the lines are?
Forget calling the people that installed them - we had to go to court to get
them to back up their other work...grrrrrrrr..