Project Background
A property owner contacted H Fraser Consulting Ltd following extensive renovations in a neighbouring garden. They were experiencing flooding and plant die-back in their own garden and wanted a professional assessment to determine the cause and potential solutions.
The goal was to provide a professional opinion on the source of flooding and waterlogging, and recommend effective hydrology and drainage solutions to prevent further damage.
Work Undertaken
- Desk Study – Reviewing site data and local hydrology conditions.
- Site Visit – Inspecting the affected garden and neighbouring property.
- Assessment – Analysing flooding patterns and water movement.
- Reporting – Providing detailed findings with recommended drainage interventions.

Findings
The investigation revealed that excess irrigation water from the neighbouring garden was causing flooding. Key observations included:
- Video footage showed a strong morning flow under the shared fence, indicating automatic irrigation.
- Flow rates were much higher than natural groundwater movement through the London Clay substrate.
- The raised neighbouring garden caused water to percolate vertically, then move laterally into the affected garden.
Recommendations & Solutions
H Fraser Consulting proposed practical hydrology and drainage solutions:
- Reduce watering in the neighbouring garden and monitor the affected property to ensure flooding ceased.
- Install a boundary drain to manage excess water and direct it safely away from the property.
How H Fraser Consulting Can Help
H Fraser Consulting provides expert hydrology and drainage consultancy for both residential and commercial projects. Our services include:
- Flood risk assessment and waterlogging analysis
- Surface water and drainage solutions, including boundary drains and sustainable water management
- Hydraulic modelling to predict water movement and prevent future flooding
- Practical, site-specific recommendations to protect gardens, landscapes, and property
By combining technical expertise with practical solutions, H Fraser Consulting ensures that water management issues are effectively addressed, protecting your property from flooding and damage. Contact us today to speak with a flood and drainage consultant.

