- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 03 Mar 2021
Hydraulic grade line
A hydraulic grade line (HGL) is: ‘A theoretical line showing the sum of the pressure elevation heads of a flow relative to a datum. For uniform open-channel flow, the hydraulic grade line is the same as the water surface. The slope of the hydraulic grade line is the hydraulic gradient.’
 Related articles on Designing Buildings Wiki
- Catchment flood management plans.
- Flood and water management act.
- Flood risk management plans
- Flood risk.
- Hydraulic jump.
- Hydraulic pressure.
- Hydrostatic pressure.
- Pitt Review Lessons learned from the 2007 floods.
- River engineering.
- SUDS Manual.
- Sustainable Urban Drainage Systems.
- Water engineering.
Featured articles and news
Creating comfortable climates despite extreme temperatures.
Study examines how adjustable arrangements can succeed.
Government announces plans to improve accessibility.
Resource addresses pandemic-related NEC4 contract issues.
Incorporating EDI into the provision of fair access.
Government announces global innovation strategy.
An architectural biography. Book review.
The house where the future king of France lived.
The teacher, architectural technologist and mum offers her insights.
Careful planning needed as supply chain issues continue.
The sensitive conversion of a neglected Cornwall structure.
Plan stresses local involvement in city, town and village development.