Worked Example of Soakaway with Costings
This is a fairly inaccurate walkthrough of a soakaway design to BRE 365 and an estimation of costs for installation of the designed soak away.
Design
Provided here is a worked example of a soakaway designed to BRE 365.
The soakaway is receiving water from a roof of 323m2.
The site is set of sandy clay soil. With a permeability of 9X10-6 (Reference Value)
1:100 year rainfall event. With 40% climate change allowance.
Size of Soakaway is 22 m3.
Soakaway dimensions are 2 meters by 11 meters. And consists of crate type modular system.
Install
Below costs, for crate soakaway:
- Crates: 110 crates at £30 each. £3300
- Digger: £500
- Soil Disposal: 40 tons @ £10 ton. £400
- Pipe Work: £500
- Labour: £2000
Total cost: Approximately £7000, with VAT on top probably.
Case Study