The late Sir Peter Shepheard had an appropriate anecdote about the opening of the Festival of Britain in London on 2 May 1951: the royal party arrived for their walkabout after it had rained. Fellow landscape architect Peter Youngman had designed the “upstream” half of the South Bank site with paving slopes of 1:100 (see photograph, page 71), while Peter Shepheard had designed the half downstream of Hungerford Bridge at 1:50—the puddles all lay upstream. We would further argue that steeper cross-drainage of 1:50 is appropriate in most landscape or garden areas. Remember to slope pavings away from buildings and away from pools, in order to minimize splash-back staining and to ensure that dirt is not washed into pools. If it is necessary ...

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