Trees

Boundaries and EdgesBoundaries and edges are an integral part of the urban design process, defining the limits and transitions between different spaces, providing a sense of place through visual, social, and physical cues.

Protecting Existing Landscape

Drainage and SUDs

Biodiversity

Gardens and Small Spaces

Management and Maintenance

Layout, parking and public realm

Landscape and Nature

Drainage and SUDs

Introduction

A large proportion of Trafford Borough is within a nationally recognised Critical Drainage Area. This means that significant areas are at a direct risk of flooding, whilst other areas have a vital role to play in preventing excess water run-off impacting those more critical areas. Each and every site has its role to play in addressing flood risk.

In an increasingly unpredictable and changing climate, it is imperative that sustainable urban drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. solutions are achieved, wherever possible.

The ultimate positive solution is where the landscape and nature combine to deliver sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants..

Sustainable Urban DrainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. systems (SUDSSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants.) have the ability to:

Hold back water run-off
Prevent flooding
Remove or reduce contaminants / pollutants from water on site
Form an inherent part of an inspiring landscape or urban setting
Provide habitat as part of the system

Codes in this Section

Code

Combining planting with ‘natural’ drainage solutions

Other Sustainable Drainage Systems

Supporting background information

SUDs proposal plan

LNL 4

Drainage and SUDs

CODE

It is no longer acceptable to simply “get water off site” in the most efficient engineered manner (pipe).

SUDSSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. components work in a number of ways. They:

Infiltrate (soak) into the ground
Convey (flow) into a watercourse
Provide Storage on site and Attenuate (slow down) the flows of water.

Larger sites with greater areas of open space have a significant role to play. For example, the open space system can successfully combine with a SUDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. scheme.

The Airfields, Deeside

Sitting at a low level, with marginal falls, and alongside the river Dee, this former Airfield site was developed through a landscape-led approach that placed the landscape infrastructure, and drainage strategy at the heart of the development, with large swales running through the open space elements of the scheme and defining the layout of the subsequent commercial, residential and industrial land parcels. The swales and system of connected ditches slowed and effectively stored water run-off from the new development.

Combining planting with 'natural' drainage solutions

There can be an incredibly successful symbiosis between landscape, nature and sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. systems. Hence, it will be expected that landscape, nature and SUDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. are the first design tools in achieving a successful drainage scheme.

These ‘natural’ drainage solutions can provide all of the identified SUDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. benefits. Additional benefits that these can bring to wildlife as well as human-related benefits are also well documented. ‘Natural’ drainage solutions must be considered and incorporated wherever possible within sites. These may include:

Wetlands
Planted attenuation basins and ponds
Planted infiltration ponds
Planted strips, trenches and swales
Bioretention areas
Rain gardens

Examples of SUDs on streets

Other Sustainable Drainage Systems

There is a well-documented hierarchy of sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. solutions.

Wherever possible, ‘natural’ drainage solutions should be introduced into a site’s landscape design and network of connected spaces. Where this is not possible, justification is required and other sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. solutions can be utilised. These can include:

Rainwater harvesting
Green roofs (on buildings or structures)
Permeable surfaces
Channels or rills
Engineered soakaways, trenches or basins
Geo-cellular storage systems
Inlet, outlet and control systems

Supporting background information

At the outset of the design process, the ground condition, water table and capacity for the entire site to drain in a sustainable manner should be confirmed through an appropriate technical assessment and report.

This preliminary baseline assessment and report must identify:

How the existing site is drained
The existing soil type and water infiltration opportunity across the site
How sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. solutions can be incorporated within the site
What sustainable opportunities exist on site to deal with water run-off in a sustainable manner (the “How” and the “Where”).

This baseline report must be submitted with the application and evidence should be presented at the submission stage to demonstrate how this information has fed in to the design.

Examples of SUDs on residential sites

SUDs layout plan

A proposed SuDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. layout plan and accompanying statement must be prepared with any planning application submitted. Applications must also be accompanied by a North West SuDSSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. pro-forma, Flood Risk Assessment and Drainage Strategy / Statement as appropriate.

This information will include detailsThe details of a building are the individual components and how they are put together. Some are a deliberate part of the appearance of a building, including doors, windows and their surrounds, porches, decorative features and ironmongery. Others are functional, although they can also contribute to the appearance of a building. These include lighting, flues and ventilation, gutters, pipes and other rainwater details. Detailing affects the appearance of a building or space and how it is experienced. It also affects how well it weathers and lasts over time. of:

How a sequential approach to sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. on site will be implemented, as follows:

1. ‘Natural’ drainage solutions (most preferred)
2. Other sustainable drainageSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. solutions (good)
3. All other drainage solutions (last resort)

This information should be proportionate to the nature, scale and type of application. It must demonstrate that the proposed SUDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants. scheme can be achieved, including:

Indicative levels information
Requisite drainage capacity
Storage capacity of SuDsSuDS are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage measures are ones which avoid adding to flood risks both at a development site and elsewhere in the catchment by replicating natural drainage processes. SuDS work by slowing and holding back the water that runs off from a site, alleviating flooding and allowing natural processes to break down pollutants.
Outfall capacity