A good friends house has a 3 tier retaining wall about 50' from their
back door holding back about 30' of the hill. The problem I am
describing is affecting (5) houses in the row.
During a recent downpour the wall failed at the highest level and had
the domino effect, the top fell, pushing level 2 down to level 1, etc.
Needless to say it's a mess.
After checking it out I found the retaining wall was build as an
upsidedown V from decorative stone and motar, no metal reinforcement
was found in the damaged wall. Furthermore all the weep holes, 4"
PVC at the lowest level still had small pebbles in them and I found
a small piece of paper indicating that NO water had ever come from them.
As far as I can tell the backfill of each level was simply TX dirt with
no stones etc to help drainage. To make matters worse my friends home
is on the far right which happens to be at the lowest level of the slope
from left to right.
Where can I find some information in regards to min requirements for a
wall like this?