Page 101 - Oxford City SuDS DESIGN & EVALUATION

9.6.4 Single, tiered storage

components

Source control should be in place where
flows are taken to an amenity play basin. In
this scenario, a tiered approach to storage is Detailed Design
useful in order to maximize the usability of
features for general amenity, play or sports.
Biodiversity can be introduced in the smaller

basin by creating wetland or any other
desired habitat.
This wetland basin at Fort Royal School can
More frequent rainfall events which produced store day-to-day rainfall whilst the much
less runoff such as the 1 in 1 event, are larger basin in which it sits - defined by the
prevented from covering the whole storage berm on the left of the photo - can store up to
the 1 in 100 volume.
component by accommodating them in a
smaller basin located within a more expansive
basin which can accommodate further Below: Excerpt of a detailed plan showing a
volumes of runoff up to the 1 in 100 event. As tiered basin with two levels (B & C) at a new
warehouse in Evesham. This example also
with other approaches the flow control can demonstrates the principle of distributed
be designed to manage the desired variable storage components with a planted
outflows at various depths of storage. raingarden (A) accommodating
up to the 1 in 10 rainfall event.
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Oxford City Council SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates