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Hi Ya,
I'm not a builder of any sorts .. but I have had a lot of experience with Water and the problems it can bring.
First .. Well Done Indeed for having a good go at sorting this urgent problem .. you've worked hard there.
Your photos are a big help .. you are right with your ideas as to where the water is coming from.
You will NEVER STOP the flow .. it knows where it's going .. and it always gets there!!
The trick is (in my opinion) to HELP it to FLOW .. not try to STOP it. The high ground (The next line of houses in the photos) is a very big catchment area .. all 'their' water is (quite naturally) heading your way!
Your 'raised' lawn alongside your garage is the current Holding Tank. All the water (more or less) stops flowing there and has time to soak into everything (including the HOUSE Foundations, not just the garage!)
The low wall in front of that lawn has no (low level) drainage 'holes' in it that I can see .. so the water can't get away by flowing out from the area. So .. the first step might be to help the water flow away easier and faster .. into the main Water Table areas lower down around your place .. there will be an 'easy' natural course for it to follow .. once you let it flow free.
Knock or Drill a line of drain holes (I'd say 4 feet apart in this case) along the base of that low wall. The holes
will need to be a good 2" (larger might be better) bore to work well.
Next .. push a 3 foot long length of steel rod up into each hole in turn, give it a good 'wiggle' and remove it .. this will create an easier route for water to flow out from the soggy ground behind the wall .. water it likes Easy !
Next .. lay Land Drain pipes .. Note! .. These short lengths of pipe must NOT be 'all joined up' and looking tidy! Just cut short (say 14" max) lengths of 'old plastic drain pipe' and just drop them in to more or less line up, with 1/2" GAPS between each section, in the trench (s) The water WILL then find (within hours) all these gaps and the flow will start form the whole lawn and All the slightly Higher Ground areas (not just from a small back bit where a single long pipe with only one small end 'entrance' would start. Don't worry about a bit of soil and gravel getting into the pipes .. the water will not mind (think mountain stream)
If in doubt .. you might look up or go to see and check how the Farmers drain their land .. also how most good land 'Retaining' Walls have a line of drain holes along their lower level
Finally .. once you have a good 'free flow' going on .. you must keep it going .. follow the flow and make sure it continues .. out beyond your patch .. out and away down the slope of the land. Failure to do that will just mean you move the soggy damp problem closer to (and under) the house !!
I had more or less the same problem many years at a house I lived in for about 35 years .. this 'help it flow' idea worked for me then .. and the water is still flowing .. even more so this 'summer' I'm told.
All that is .. just in my opinion .. of course.
Simples
![Oh well :\](https://foc-u.co.uk/Smileys/efocicon/undecided.gif)
See ya in about a year then .. Start today!
Stay Safe Trev The Polar Bear (45 years Pro DIVER
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