Steep incline toward side of bungalow - Soakaway

[King.Bob]

Hello,

I bought a new build (yes I know I know, we are both physically disabled and did not have choices) Bungalow that down the side has a steep incline toward the side of the property.

As usual asking the developer for help is a non-starter.

There is no option to grade away from the property due to the road (see photos).

Because we both have disabilities, and the awkward nature, keeping control of the grass or getting someone to do it is proving challenging.

The current grading is 2 bricks below the DPC.

I want to have the area covered with stones to make it manageable.

I have asked several landscapers quoting for suggestions on what we can do.

Currently there is no flooding even during heavy rain.

One contracter suggested a channel dug next to the house, a soakaway, filled with gravel and then weedmembrane and 20mm of stones on top.
All other quotes just say to dig the usual 20mm, membrane and stones.

Any suggestions or advice? I know the 5m rule however I have researched regarding shallow soakaways vs SUDS and the 5m rule depending on circumstances.

I am concerned about possibility of water getting above the DPC. (See photo 1 next to the small retaining wall where the grass and water and staining is).

Any advice as it is hard to find anyone to help when you have no family or friends and both disabled?

Should we have the soakaway and trench, or would just 20mm dug down, membrane and pebbles be best?

Thank you so much in advance.

Edit: TLDR basically we just want to make this manageable and maintenance free, what solution can we employ if stones with membrane is not the best idea. Thank you

 

[blup]

The tide marks suggest damp above dpc level near tne retaining wall. Can you build a low wall/ barrier somewhere between edge of highway and the bungalow wall to restrict major surface water run off from the road.