concrete driveway slab


Old 01-18-01, 09:17 AM
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hello, this is ken inge, recently we had a concrete slab poured connecting to our garage. as you face the garage, on
the left side we have a screened in patio. when the slab was graded, we wanted the fall to go to the right of the garage as you face it, into the yard. the fall was not deep enough and as a result, i have rain water pouring into my patio and some standing water about 3 to 4 feet from the
entrance to the patio and patio itself. my question is, am i stuck with this problem or is there a way i can channel the water so it will run off the slab? let me say this also; to prevent the water from entering the patio we had a small concrete wall of about 3 to 4 inches built in front of the patio, along with about a two and a half foot step at the entrance about 3 inches deep. this has stopped the water flow into the patio, but the standing water from that point on is still a problem. simply put, the fall should have been on the right into the yard vice on the left into the screened in patio. question-how can i channel the water to go into the yard on the patio side since this is where the actual fall is occurring? additonally, would gutters help in this situation also? if addtional information is required, i will provide it to you as best as i can.

thank you,
ken inge

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Old 01-18-01, 09:30 PM
Join Date: Dec 2000
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First, if the house or garage roofs are contributing to the runoff gutters and downspouts are a plus.

If the new slab is a (driveway?) and it's sloped to the street and the water is collecting at "curb1" (see sketch) the step can be broken out and a new one poured. But this time a piece of abs pipe would be inserted at the base of the step, allowing water to run to the street.

Maybe the answer to your question: A hole can be bored in "curb1" or "curb2" with a large hammer drill, and 1 1/2" to 2" abs or pvc pipe grouted in. Afterward direct the flow to the rear with more plastic pipe (preferably under ground).

Other options:
A drain with an outlet to the yard (gravity feed).
A small sump pump and sump pump box (power source).
The former involve removal of concrete and/or hiring driller to bore under the slab plus installing plastic

A steel culvert "channel" across the driveway
(Definitely removal of concrete plus higher cost).


| |
rear | Garage |
|| curb1 | yard
| | step |
House? || curb2

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