Slightly sloping garden towards decking.

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Hi folks,

Long time lurker here, but now registered finally. I have just started a garden project to lay decking over an already played patio, got all bases covered for the decking apart from one thing, I wonder if anyone has any ideas or ran into the same issue.

The garden has a slight slope to it, higher at the back of the garden running to the house where the lowest point is (patio area and drainage). There are 2 small wall planters which will be built, could be used as small retaining walls.

When the decking is finished, it will be a level (of course) this means it will almost meet the slope at some point (at the 4.2m to be exact). I have no idea on the slope gradients, I presume it is about 1.5ft difference.

I have attached some images of what I think is going to happen after the decking is laid.

How to transition the decking to the grass area? would you add a step here?, possibly large long steps to go from deck to meet grass slope. I think there is going to be a slight drop from the decking to grass as the deck won't exactly meet the slope exactly. I don't really want to re-grass if I backfill the gaps with dirt.

Any ideas?

Garden slope issue:
GwGjN7u.jpg


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Garden design:
vB1ghCa.jpg

vB1ghCa
 
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Step should be ok, do you think the planters and steps would stop any water running off? Could be an idea to have some pipe at ground level so it can pass through.
 
Ian thanks for replying, and sorry for the delay. Just to clarify my wall story, these walls are not really retaining anything. They are planter walls. Not holding anything back apart from 2inch of dirt/grass at the bottom.

I have dug out a 3 inch deep concrete footing for the walls, which will accept the brickwork when it's dried fully (440 x 125mm concrete bricks). I then plan to use PCV weep holes every meter or so on the back and front of the wall to allow water to flow if needed then render when dry. Do you think I need anything at the back of the wall where the grass slope is running to the planter?. Say a small french drain of gravel or decorative stones in between the grass and stone to aid water runoff from the soil and grass?.

Some more questions about the footing. Do you think this will be enough to stop the wall toppling over?. I take it 75kgs of concrete will be enough for each footing, then cemented brickwork on that footing 3 courses high?, Roughly 2ft high.
 
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I think that will be fine. I have a loose pile of stone retaining ground in my garden, that’s been done for a year and it’s just sat on clay, no actual foundations.
AF2CBFF6-B4CA-44EC-A6AA-563A36766427.jpeg
 
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Thanks for the photo Ian, really helps me. Finishing off the decking first, then I'll tackle the planter walls. I have added a few bits to the wall now, I added 3 2m rebars into the concrete for extra support, as got kids in the garden, the last thing I want is for it to fall over etc. I am using common concrete blocks for my build then to be rendered white. You are using solid rock which is heavier and most likely would never fall over, concrete blocks are way lighter.

Here is my plan.

3-inch concrete base, level with 3 2m rebars in the concrete, evenly spaced.
Engineering bricks to make up the first course and cement those to the rebars (will be covered by decking later) as they fully waterproof etc
Then the concrete blocks on top of those up to approx 600mm or 2ft. whatever hight 2 blocks give me.
Filled with spoil and rendered.
 

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