Improving drainage - 'no till method'

Hi,

With our higher than normal levels of winter rain for the past couple of
years, the lower level (south side) of the garden is completely moss
covered and damp.  This area is surrounded by Myoporum laetum hedge
about 2metres high inside a low retaining wall.  Therefore the area gets
little winter sunshine to dry off all the water that drains down from
the rest of the garden.  The existing plants i.e. oleander, almond,
schinus are doing well but newly planted trees last year have not
thrived but still alive.

So how do I improve the drainage in my clay soil?

Moira wrote before of the 'no till method' using large amounts of
mulching material to improve soil condition.  This would obviously help
but is it enough?
How many years (!) before you can see an improvement?
What depth of mulch should one use?

>From a very pleasant Costa Blanca (24C today)
Maria
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