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Soakaway calculation spreadsheet

Bre 365 soakaway design digest 2026

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The document provides detailed calculations and methodologies for assessing soakaway infiltration rates based on BRE Digest 365, including trial pit data, water level readings, and soil infiltration rates. It also includes greenfield runoff estimations for the Creswell Tip Restoration site, outlining hydrological characteristics and flood risk assessments for various storm events. The document emphasizes the importance of using hydraulic modeling software for drainage design.

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Click ‘Get Form’ to open the bre 365 soakaway design digest in the editor.
Locate the yellow-highlighted cells where you can enter values. These are the only fields you should modify.
Begin by filling in the 'Trial pit number', 'Test carried out by', and other identification fields at the top of the form.
Proceed to input measurements for 'Actual depth of pit', 'Effective depth of Pit', 'Length of Pit', and 'Width of Pit' in their respective fields.
Calculate and enter the proportion of pit volume occupied by gravel solids, ensuring accuracy based on your material specifications.
Follow through with calculations for volume, effective volume, and internal surface area as indicated in the notes section, using provided formulas.
Finally, review all entries for accuracy before saving or exporting your completed document directly from our platform.

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What does the BRE stand for?

Founded in 1921, the Building Research Establishment (BRE) has been raising the standards of the built environment for over a century. BRE started as a UK government-funded, research-based organisation, and has become an ambitious profit-for-purpose global business.

What is bre digest 365?

Digest 365 is one of the most widely used BRE publications, aiding designers to support planning and development applications. This new edition describes the design and construction procedures for soakaways, and explains how to calculate rainfall design values and soil infiltration rates.

How to do a bre 365 soakaway test?

Testing Procedure: The process involves saturating local soil and observing how quickly the water drains. If the water drains rapidly (within 10 minutes), the hole should be refilled up to 10 times. If the water continues to drain away, then the soil is deemed unsuitable for a soakaway.

How do you calculate the design of a soakaway pit?

The design method for sizing a soakaway is based upon the equation of volumes: I O = S where: I = the inflow from the impermeable area drained to the soakaway; O = the outflow infiltrating into the soil during rainfall; S = the required storage in the soakaway to balance temporarily inflow and outflow.

What is bre digest?

BRE (Building Research Establishment) is an independent, research-based consultancy, testing and training organisation, operating in the built environment and associated industries.

bre digest 365 free download

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What is the BRE certification?

We certify the safety of a range of products and services including fire, security, construction, environmental management processes and systems. We use a thorough process that includes independent assessment and validation of the evidence you give us about your product, service, or practice.

What are BRE digests?

BRE (Building Research Establishment) is an independent, research-based consultancy, testing and training organisation, operating in the built environment and associated industries. BRE Digest 365 Soakaway design was first published in 1991, when it replaced Digest 151.

What does the BRE group do?

BRE provides independent testing, inspection and certification (TIC) services, from individual products to whole buildings.

Bre 365 soakaway design digest 2026

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