Detention Basin
A normally-dry, landscaped depression that fills during storms and releases water slowly, controlling flood risk. Grassed or meadow-planted, it doubles as amenity space between rainfall events.
Carbon and evidence
Carbon Sink & Ecosystem Services
A living landscape element — a carbon sink and provider of ecosystem services, not a manufactured product. Its value is measured by sequestration and biodiversity, not embodied carbon, and it must never be netted against a product’s A1–A3.
Carbon Sequestration
Not sequestration-led
The primary value here is biodiversity and/or water function, not carbon storage.
Biodiversity Net Gain
grassland base; meadow planting and occasional wetness lift its value
Source: Defra Biodiversity Metric 4.0
England requires a 10% Biodiversity Net Gain; distinctiveness is one input to the habitat unit calculation.
Water / SuDS
storm attenuation with controlled slow release; normally dry
Source: CIRIA SuDS Manual (C753)
Ecosystem Services
Establishment & Maintenance
excavation, outlet control and any liner carry an upfront construction carbon cost
Read This Honestly
- •Dry basin — for permanent water and higher wetland biodiversity use an attenuation pond/wetland.
Products in this category
No manufacturer products are listed in this category yet. You can specify detention basin generically and carry it through to a render and specification as normal.
Specification
- Finish
- Dry attenuation basin
- Service life
- 60 years