Drainage around boulders and side of house

[Glyph]

Hello all, I am hoping to get some advice from some drainage masters.

I have a split level home on a steep block. On the east side, where the house steps down, we have a brick retaining wall behind our carport, and some large boulders. Water from the upper carport/garden bed often flows down the boulders and along the side of the house and against the bedroom wall where we have a couple of vents. Puddles of water are often sitting at the bottom of the boulders and leaving the soil/gravel right next to our house wet. This has all been compounded by our neighbours new concrete fence which is acting as a giant moisture barrier, trapping things on our side.

We have had an agi-drain installed along the fence, however it doesn't go up past the boulders. I have laid large slate pavers and gravel to keep the side area reasonably permeable but the issues is the far corner. I am seeking some guidance on the best way to address this.

- Do I add another agi-drain right along the house, to prevent water running close to the walls/vents.

- Do I add an agi-drain along the boulders, so water that runs down these gets absorbed?

- Do I just try to improve the fall of the ground around the boulders, to help guide the water further down?

I would appreciate any guidance.

Side of houseBoulders and problem area on right

[TedBear]

To answer the question about how the waterproofer looks, I used the product @MitchellMc recommended too... rain poured down from the roof and seeped through the single brick there. Here is a pic of the effect. The coating stops at the window edge... a slight sheen. The eaves in the pic end just to the right, so rain hits the wall there (& also goes into the stoney drain).

 

[Glyph]

Thanks @TedBear that looks discrete. I think I'll get some and cover the brick retaining wall and some of the side walls. They all get a lot of splashing of rain off the boulders.