Bio-flow Proof of Concept

A GGR-Peat Flexible Fund Project

Led by: RSPB. Project partners: FWAG SW and Moor SW Ltd

Successful rewetting of agricultural peatlands often requires raising water tables uniformly across fields. However, strong lateral hydraulic gradients can prevent water from spreading effectively, limiting restoration outcomes and leaving parts of the peat vulnerable to continued oxidation. This project investigates a new passive approach to improving subsurface hydrology.

Bio-flow uses biochar-filled mole drains as subsurface conduits designed to encourage lateral water movement. Acting as preferential flow pathways, these conduits aim to distribute water more evenly across the peat profile, supporting sustained high-water tables without the need for pumps or extensive surface infrastructure.

Biochar’s hydrophilic and porous properties may enhance hydraulic conductivity while also improving nutrient retention and providing additional carbon sequestration benefits. By integrating this method into existing agricultural drainage systems, the project aims to demonstrate a scalable, low-maintenance technique that supports both productive land use and peatland preservation.