Background knowledge from our projects: design and operation of stormwater retention facilities, measuring methods for sludge and sediment, and experience from drone surveys across Germany.
How stormwater retention facilities on highways are designed, which pollutants they retain and why silting must be checked regularly.
Why measuring sludge in basins with a permanent pool is so difficult – sounding rod, boat, sonar and drone compared.
Results from 23 drone surveys: in 52% of the facilities, the mean sludge depth was 30 cm or more – an average of 189 m³ per facility in need of cleaning.
A sample calculation shows how spot samples can overestimate the sediment volume by more than double – and how to do it more accurately.
How the DTS Acqua method surveys ponds, lakes and basins area-wide – and how sludge thickness and volume are derived from the data.
