subs above ground thomas geoghegan
DESCRIPTION
DT117/4 Sustainable Build & Design - Class PresentationsTRANSCRIPT
![Page 1: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/1.jpg)
1
Sustainable Drainage Systems:
Above ground
attenuation
Thomas Geoghegan
![Page 2: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/2.jpg)
Agenda
Background on Sustainable Drainage Systems (SUDS)
Selecting the best SUDS option
Above ground attenuation options
Case Study
Why choose above ground attenuation systems?
Questions
2
![Page 3: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/3.jpg)
Background on SUDS
3
![Page 4: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/4.jpg)
Background on SUDS
4
• Drainage Design in the past has been simply using a rational method size pipes to ensure water is removed as quickly as possible
• Sustainable Drainage Systems: is a concept that includes long term environmental and social factors in
decisions about drainage.
• In rural areas 80% of rivers are below ground status
• Most pollution comes from:
- Underperforming small treatment plants
- Overloaded communal septic tanks
- Clusters of single unit septic tanks
- Farmyard runoff
• Over the past decade Ireland & the UK have been developing a more sustainable approach
![Page 5: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/5.jpg)
Selecting the best SUDS option
5
![Page 6: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/6.jpg)
Selecting the best SUDS option
6
When selecting Sustainable drainage systems it important to consider Quality, Quantity Amenity Equally
![Page 7: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/7.jpg)
Selecting the best SUDS option
7
• There is no correct way in choosing the best SUDS option but these factors must be adhered to:
- Design techniques to meet design criteria
- There is no single correct solution: selection could result from
external factors
- The sustainable drainage system should be in accordance with
the original drainage system
- Decision must be on a wider context and not purely technical
![Page 8: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/8.jpg)
Above ground attenuation options
8
Basins and ponds Filter strips & swales
![Page 9: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/9.jpg)
Above ground attenuation options
9
Basins and ponds Basins are areas for storage of surface runoff & are free from water under dry
weather flow conditions. These include:
- Flood plains
- Detention basins
- Extended detention basins
Ponds contain water in dry weather and are designed to hold more when it
rains. They include:
- Attenuation ponds
- Flood storage reservoirs
- Lagoons
- Retention Ponds
- Wetlands
![Page 10: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/10.jpg)
Above ground attenuation options
10
Basins and pondsBasins and ponds store water at the ground surface as:
- Temporary flooding
- Flood plains
- Permanent ponds
![Page 11: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/11.jpg)
Above ground attenuation options
11
Basins and pondsQuantity
They store floodwater and release it slowly once the risk of flooding is over
Quality
Treat:
- Settlement of solids in still water
- Conditions and promotes settlement
- Adsorption by vegetation of soil
Amenity
Offer:
- Sports and recreation
- Wet ponds are great to store water for reuse
![Page 12: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/12.jpg)
Above ground attenuation options
12
Filters strips & swalesFilter strips and swales are vegetated surface features that drain water evenly
off impermeable areas. Swales are long shallow channels whilst filter strips
are gently sloping areas of ground.
![Page 13: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/13.jpg)
Above ground attenuation options
13
Filter strips & swalesThey work by imitating natural drainage patterns by allowing rainwater through
vegetation, slowing and filtering the flow.
Quantity
Swales & filter drains are designed for:
- Conveyance systems
- Infiltrations
- Reduce drained impermeable areas
Quality
Swales and filters remove polluting in the solids through filtration and
sedimentation
![Page 14: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/14.jpg)
Above ground attenuation options
14
Filter strips & swalesAmenity
Swales and filters trips are often interpreted into surrounding land use
Examples are:
- Public open space
- Road verges
- Grass and flowers can be planted for wildlife
![Page 15: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/15.jpg)
Case Study
15
Matchborough School
![Page 16: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/16.jpg)
Case Study
16
Location:
Redditch, Worcestershire, England
Description:
A school development was designed with conventional drainage that flowed to
a pump station from where it was pumped to a sewer
During construction one playground area could not be drained by gravity to the
pumping station.
Main suds used:
Swales
Detention basins
![Page 17: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/17.jpg)
Case Study
17
• The suds scheme was implemented & removed the need for the station
• Now follows the contour of the site and drains downhill to a ipsley stream
Initial proposal Sustainable drainage outline proposal
![Page 18: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/18.jpg)
Case Study
18
Swales collect overland flows from: - Adjacent site - Runoff from car park
- Playgrounds - Hence providing source of control
The retention basins drain the main driveway that is connected to a
constructed wetland (pond) which also takes runoff from the roof.
Car park Inlet
![Page 19: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/19.jpg)
Case Study
19
Benefits
The suds system has brought a valuable amenity and teaching resource for the
school
![Page 20: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/20.jpg)
Why choose above ground attenuation systems?
20
- Installed and maintained at a lower cost compared to more traditional
systems of drainage
- Problems can be observed and dealt with as they arise(swales)
- Can be incorporated into any terrain
![Page 21: Subs above ground thomas geoghegan](https://reader033.vdocuments.mx/reader033/viewer/2022052822/554c8ae6b4c905834a8b5573/html5/thumbnails/21.jpg)
21
Any Questions?