sewer survey services./ tv inspection annual order 2022-2023./ the inkb intend to award the sewer inspection services in the 2022/2023 financial year. the services include the cleaning and tv inspection of public main sewers, their shafts and the connected lines. estimated number of channels to be examined: main channels about 27,000 m connection channels approx. 2,500 pieces. leak tests must also be carried out. the test results must be documented.