week 16- Water Management Calculations & Rainfall Analysis

This tutorial focused on developing the water management calculations for the site and understanding how rainfall volume influences the wider drainage strategy. The session explored methods for calculating water runoff from roof surfaces and how different material conditions, such as standard roofs and green roofs, affect water retention and discharge rates.

The calculations helped develop a more technical understanding of how much water enters the site and how this can be managed through sustainable drainage strategies integrated within the design.

Key Learning

A key takeaway from this session is that water management strategies must be supported by measurable calculations rather than only conceptual ideas.

The tutorial explored:

• Annual rainfall data for London

• Roof runoff calculations

• Water collection volumes from canopy structures

• Differences between conventional roofs and green roofs

• Retention percentages and runoff reduction

This helped strengthen the technical justification behind the proposed water management system within the project.

The calculations investigated how rainfall can be converted into measurable water volumes using roof area and annual rainfall data.

The formula explored:

• Roof area × annual rainfall × runoff coefficient