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Soakaway Design Spreadsheet to BRE Digest 365: 2007 edition
(Dry Well, Infiltration Tank, Recharge Basin)
 

Description:
Spreadsheet for calculating required soakaway size (outside UK more commonly known as: dry well). Pit/well of this type is to first store immediate stormwater run-off and then slowly dissipate it through infiltration into surrounding soil. In this way water is treated on site and not discharged into public system. Stormwater control has become a very important aspect in recent years. In UK it is regulated under building regulations and discharge from new developments into public sewer cannot be higher than before construction of, say, house or building.

This software is very useful for both, large and small scale projects. It is recommended for civil engineers designing roads and hardstandings, structural engineers designing drainage for industrial and commercial developments, builders constructing domestic extensions or any land owner who wants to protect the environment by treating water on site.
Features:
- Can be easily used by a civil engineer, structural engineer, CAD technician as well as a builder or a regular house owner - no technical knowledge required;
- A clear and easy to read output (all on a single page);
- Four types of soakaways covered:
    - infilled pit or trench; 
    - modular geocellular units;
    - perforated concrete ring in square pit; 
    - perforated concrete ring in circular pit;
- Pop-up window for easier selection of rainfall ratios - quick selection of default figures for main cities;
- Calculates soil infiltration rate based on soakage trial pit test results;
- Adjustable infiltration through base (allowed for geocellular units);
- Adjustable allowance for climate change;
- Automatically calculates Z2 growth factor based on given rainfall ratio, M5-60 rainfall depth and rainfall duration;
- Covers ten rainfall duration periods: M1-D, M2-D, M3-D, M4-D, M5-D, M10-D, M20-D, M30-D, M50-D, M100-D;
- Calculates alternate soakaway sizes for different trench widths and ring diameters;
- Covers two site locations: England and Wales, Scotland and Northern Ireland;
- Includes a 50% emptying time check;
- Design is based on BRE Digest 365: 2007 edition (Note: BRE issued an updated edition in 2016, the spreadsheet is still based on 2007 edition)

(Note: macros must be enabled for proper working of the spreadsheet. Follow instructions in this video)
What People Say:

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Company

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You can work out by hand, but this excellent table cuts the time down for those that know their inputs and realistic outputs.

Stephen Gibson
Managing Director at Wilsham Consulting
​www.wilsham.co.uk

Director
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Capita (www.capita.co.uk)

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I downloaded the soakaway calculation spreadsheet, and to be honest was not expecting much. Considering other software is priced at £450! However - I am delighted, the software does all that I want, when the planners asked for a 1 in 30 year storm event instead of the normal 10 year I did panic a bit. But looking closely at the software it even gives you the ability to update this - 10 out of 10 !!!

Geoff Cawse

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The spreadsheet is perfect.

Michael C.

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Provide testimonial or feedback
System Requirements:
To run the Single-User Licensed version you require:
- Microsoft Windows Excel version 2007 and above;
(Note: the Single-User spreadsheet will not run on Mac due to unsupported activation procedure)

To run the Company Licensed version you require either:
- Microsoft Windows Excel version 2007 and above;
- Microsoft Mac Excel version 2004, 2011 and above. If unsure then see whether the FREE version works.
Download Section:
FREE Lite version: Soakaway Design
Spreadsheet to BRE 365 (1.3).

The restriction in this free lite version is that you cannot change the company name or the logo (shown in top left corner). Also, indicated cells are locked.
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​PLEASE NOTE: The file is in XLSM format. ​If after downloading you get an error message about invalid file format (XLSX) then please update your web browser or use a different one and re-download the file. Some versions of Microsoft Edge, Microsoft IE are known to corrupt XLSM files upon download by changing these to XLSX format, making these unreadable in Excel.


FULL version: Soakaway Design
Spreadsheet to BRE 365 (1.3).

Single-User or Company License, which one is the best for me?

Fully working version where you can change the company information and logo in the top left corner.

By purchasing this spreadsheet you agree to the disclaimer and terms & conditions. Two types of licenses are available for this spreadsheet. The single-user license is offered for a nominal price of £20 - a great product that you can have for a great value.

After purchase fill in this Activation Key Request Form.


 
 


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