The Public Works department has noticed that certain sewer lines in your sector are blocked due to an accumulation of small branches and other small bits of debris which can only be there if they were purposefully put down the gaps in the sewer grates. Recently, the accumulation of debris has caused many sewer back-ups.
We would ask for your cooperation in stopping this recurring issue in your sector by asking you to inform your children and anyone else who you might see putting debris in the gaps in the sewer grates of the consequences of their actions.
Thank you for your cooperation.