The LAMBS website has another interesting article, this one on the implications of the Mayfield development for the regional hydrology:

“Every time it rains there would be massive floods which could wipe out Shoreham,” says Frank Preston who worked on the river for 30 years, as a Flood Defence Agent for Southern Water Authority. “The extra impervious run-off from houses and roads, that sort of thing, would just overpower the river.”
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John Donaldson, former Operations Manager for the Environment Agency, with 35 years of experience in the water industry, says he was “horrified” when he heard of the plan. “The impact of the drainage system and surface water run-off will be a nightmare,” he says. “We can hardly manage the run-off that we’ve got at the present time. There’d be even greater flooding without doubt – to land, to property, to road systems and transport – everything. The upland catchment already has enough water in the meadows and fields – we cannot take any more water.”
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[Peter Haworth Booth:] “The implications of Mayfield are enormous. I think a lot of houses just won’t be habitable. I don’t know what the quantities of water are but the speed of the run-off is going to cause mega problems from here down to Bramber.”

Read the rest at the LAMBS website.