New technique for continuous monitoring of sediment height

• Continuous measurements of sediment height.
• Development of a technique.
• Presentation of the regulations that have to be respected.
• Presentation and justification of the technical choices.
• Presentation of the results and discussion.

A sewer deposit is a complex mix of minerals and organic materials whose dynamics remain difficult to ascertain. One way to improve the knowledge held on sewer processes consists of obtaining detailed long-term measurements. This paper will present the technique developed for long term monitoring of sediment height within a combined sewer. The aim of this device is to acquire long-term records of the sediment height evolution. The current state of the art is discussed and the technical constraints are exposed. Next feasible technical choices are explained and then results are provided and discussed.