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Wait-don't do it!

Flyboy-Not sure if the previous post read your whole post. If those are your basement stairs UNDER NO CIRCUMSTANCES SHOULD YOU RAISE YOUR NEW POUR TO THE LEVEL OF THE TOP STEP! Especially with the grade conditions you show and describe, you would just be facillitating the transfer of your drainage problem down the stairs and into your basement. In a case like yours, if you can't change the grade (which can be complex and involve retaining walls and your neighbors) then you have to improve the drainage our your new poor is doomed to suffer the same wet fate as your sunken slabs. Chances are, a very simple French drain (little more than perforated drain tube, filter fabric and gravel) can divert the water that undermined your slab(s). The drain trench should be uphill from your stairs and parallel to them and the sunken slabs and ideally begin at or near the fence line in your picture and extend past the stair walls. Good luck!
 
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