Rainfall Zone
The UK is divided into 8 different zones describing their rainfall characteristics. Each zone has different factors for rainfall intensity and the intensity of storm events. A map showing the different zones is given below.
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.
Learn More
Manning Open Channel Design Spreadsheet
This spreadsheet uses the Manning formula to calculate the flow conditions in an open channel acting under gravity only.
Learn More
Runoff Calculator Spreadsheet
This spreadsheet calculates the design runoff flow for a site in accordance with the Flood Estimation Handbook.
Learn More
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.
Learn More
Attenuation Design Spreadsheet
This spreadsheet calculates the requirements for a attenuation system and assists the user to design a suitable system.
Learn More
Soakaway Design Spreadsheet
This spreadsheet calculates the requirements for a soakaway system and assists the user to design a suitable system.
Learn More
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