Sloping roundabout

[jonnyboyentire]

It never rains but it pours!
Mate of mine has asked me to help them out. Big roundabout at the end of their street, about 15m dia. Heavy slope down from left to right as viewed from the splay. Private road and majority of the ones down the street won't contribute.
When viewed from l/h/s - lowest point (ie 9 o'clock if the splay is at 6 o clock) the level left to right is very different too (ie sloping from 12 o clock to 6 o clock). We can grade the grass/muddy mess in the centre to suit as they want it grassed.
I've got the tarmac sorted (the road needs re-doing) but we need to build a retaining wall around the low spots (with weeps etc, done properly and reinforced.
The issue is that the wall will need to slope down from about 1 o clock (anticlockwise) to about 10 o'clock, bottoming out, then slowly upwards to 5 o clock (which is lower than 1 o clock. We can't just build up the lowest point to the highest as it is a lot of courses, maybe 15-20 which will be a horrific barrier to the person whose drive is opposite. Normally we would have just stepped it but the central lawn precludes that totally (the runout is 15 courses to zero at the ends if you know what i mean).

Anyone got a bright idea - neither I or my brickie (very good but used to conservatories/extensions etc) have come upon this situation before.

Many thanks chaps, i'll try to draw and post a diagram later on (won't be wonderful!)

[lutonlagerlout]

99/100 brickwork should always be level
and if there are differences in level then the wall gets stepped
75mm per step
the only time i have ever built brickwork out of level was on a wall on a ramp at a shopping centre which the architect in their infinite wisdom wanted to run up parallel to the ramp
it was the broadwalk shopping centre in edgeware here
a picture would be handy johnny
cheers
LLL

[jonnyboyentire]

see if these come out at all

[lutonlagerlout]

i cant see any problem?
just set out I.E. if its a true circle find the centre and use that or other mark a line then set up datums every 2-3 M round the circumference and build to these
if you want different heights just step the brickwork 75mm a time
if you dont like the look you can use a plinth stretcher brick

cheers LLL

[lutonlagerlout]

btw 20 courses is 1500mm cant see 1500 mm there johnny??
just step and keep say a mean of 300mm above finished road height
cheers LLL

[jonnyboyentire]

It's their requirement to have a flattish lawn in the centre of the roundabout that cocks it up LLL. Combine that with the need to keep the walling low at the low spot (9 o clock) and there's my problem.
Theres prob about 1350/1400 difference but I will confirm when I take me old laser there to check it out thoroughly.
i suspect the way to sort it is either step it or slope it , then create a nice wide border around the wall which we can ramp up a bit to the lawn. It might look boody stoopid though.

No wonder the previous guy (the one who laid his bricks sloping) buggered off halfway. (did anyone see the weeps ?)

[GB_Groundworks]

am i missing something if they want a level lawn then strip the soil and reduce the level???

most roundabouts are conical in shape though

[jonnyboyentire]

effectively to get the lawn flat we'll have to take off enough to virtually grade it to the road levels, otherwise it'll be higher than the brickwork.

[seanandruby]

where the grass meets the road.. Why not bring that up a course or two of bricks also?

[jonnyboyentire]

where the grass meets the road.. Why not bring that up a course or two of bricks also?

could do but i think the only way that would benefit me would be if we graded the soil at that side below the road level, therefore reducing the gradient.

[GB_Groundworks]

You can order kerbs made to any radius you want, just Kerb it or get the big double height kerbs, better off with kerbs for when inevitably someone hits it Be it big wagon lost or some rich mum in a 4x4 in the ice etc