NA-05 - Cleaning: Cleaning Strategy and Programme

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Fundamentals
Cleaning measures
Development of the cleaning plan
Cleaning strategy
Optimization of the cleaning effort
Determination of cleaning intervals
Summary

Determination of cleaning intervals

Determination of the required cleaning effort

Inspection plans are developed based on the "review and description of the drain and sewer system" that has been realized in step 1.

Their purpose is to determine the on-site situation regarding the formation of deposits and the need for planned cleaning measures.

Visual inspection of a manhole from above

Visual inspection of the manhole and line using a mirror

Manhole inspection using a CCTV camera

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Inspection plans combine statements with respect to the deposition behavior from various operational processes, as for example in the course of manhole or shaft inspections (accessed by man or by technical equipment) to be carried out according to DWA-A 147, and determine the additional inspection effort required.

They can include a visual inspection of manholes/shafts to determine the deposition behavior in the channel of the manhole/shaft, but also the use of visual inspection processes for drains, sewers and manholes. The information obtained from the inspections is integrated into the sewer database.

Updates of inspection plans with respect to the required inspection frequency and priority are performed based on the severity of the classified and assessed deposits.