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Planning Applications

Flooding Report - Soil Type

Soil type

The soil is predominantly London clay to a depth in excess of 2.5 metres and therefore very poor for drainage. Water collects and remains on the surface for weeks due to the impermeable nature of the ground.


Rainfall Rates

The standard rainfall rates, for this area, for calculating drainage requirements are as table 1

Table 1

Storm EventRain mm/hr 100 year return periodRain mm/hr 100 year return period + 30%
15 min winter 97 126
30 min winter 64 83
60 min winter 40 52
120 min winter 25 32
180 min winter 18.5 24
240 min winter 14.6 19

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