Page 12 - NORMA WM Drainage Catalogue EN

DRAINAGE SOLUTIONS We put water in its place

Sustainable Surface Water Solutions

S5 by NDS™ offers a comprehensive solution in line with Low Impact Development policies by managing surface

water as close to its source as possible through runoff reduction and quality enhancement at the site scale. The
S5 system is built around known and trusted components, providing solutions that offer five key benefits:

1 Conservation of water resources to improve our well-being

2 Management of surface water at the source to reduce
downstream impact

3 Flexibility of system footprint to allow for adaptive
implementation
4 Mitigation of pollution and erosion to protect water systems

5 Replenishment of groundwater to help ensure future
supply

A single-source solution, S5 by NDS is easy to specify and
offers up to 250% more detention volume than traditional

gravel systems.

Design Your S5 System

An effective on-site surface water system can be designed in five easy steps:

1 Identify Sources – Surface water runoff may come from point sources 4 Size the System – Detention and infiltration devices have measured
like downspouts, as sheet flow from parking lots, irregularly through holding capacities. Select the appropriate quantity and arrangement of
drainage ways in the landscape or even as elevated groundwater. devices to handle the predetermined runoff volume calculated above.
Also consider the capacity of conveyance and overflow piping.
2 Select Method of Capture – Each runoff source has a practical
method of capture for conveyance to the detention and infiltration area. 5 Determine Field Layout – Site constraints including setbacks, land-
form, soil types, fixed objects and open space, among others, will
3 Determine Peak Flow and Detention Volume – The quantity of inform the location and arrangement of system components. Each
runoff for a given rainfall event over a defined area is easily calculated element of runoff capture, filtration, conveyance, detention, infiltration
when surface type and rainfall intensity are known by using the Rational and overflow must be considered.
Method formula Q = CiA. Applicable regulations generally provide gui-
dance on the rainfall intensity to use for a given set of circumstances.

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