• The white area shows the non-moving water, which is just sitting and building up. Eventually when it reaches a certain level it seems to flow down towards the terrace.

    The actual concrete does seem to be slopped away from the building, but the grass is built up which seems to stop the water flowing away.

  • French drain. Remove 6 inches of concrete, dig a slit trench as deep as you can. Layer with a few inches of pebbles. Back full with earth and pebbles/rock plant dwarf varieties of hardy herbs.

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