Climate Change Factor
This factor allows for the likely increase in Rainfall Intensity expected during the drainage systems design life due to climate change. Typical values are given below;
Increase in Peak Rainfall Intensity
- 5% - 1990-2025
- 10% - 2025-2055
- 20% - 2055-2085
- 30% - 2085-2115
Related Spreadsheets from CivilWeb;
Colebrook White Pipe Design Spreadsheet
This spreadsheet uses the Colebrook-White and Darcy-Weisbach formulas to calculate the flow conditions in a circular pipe acting under gravity.
Find Out More
Manning Pipe Design Spreadsheet
This spreadsheet uses the Manning formula to calculate the flow conditions in a circular pipe acting under gravity only.
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Manning Open Channel Design Spreadsheet
This spreadsheet uses the Manning formula to calculate the flow conditions in an open channel acting under gravity only.
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Runoff Calculator Spreadsheet
This spreadsheet calculates the design runoff flow for a site in accordance with the Flood Estimation Handbook.
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Linear Drainage Design Spreadsheet
This spreadsheet calculates the maximum flow from a specified linear drainage channel and checks whether the channel is sufficient for the specified site and storm conditions.
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Attenuation Design Spreadsheet
This spreadsheet calculates the requirements for a attenuation system and assists the user to design a suitable system.
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Soakaway Design Spreadsheet
This spreadsheet calculates the requirements for a soakaway system and assists the user to design a suitable system.
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Full Drainage Design Suite
Full drainage design suite (50% Discount) including 7 spreadsheets;
- Colebrook White Pipe Design
- Manning Pipe Design
- Manning Open Channel Design
- Linear Drainage Design
- Runoff Calculator
- Attenuation Design
- Soakaway Design