"During the construction of the retaining wall for Kariyilthodu 30 years ago, the canal was 3.4 metres deep.
However, the depth has now reduced to less than 70 cm," said G Ravi, a resident of Secular Gardens at Muttathara.
Some of the residents move into hotels or their relative's houses during heavy rain as the contaminated water enters the housing complex every year.
Every year, the resident's associations at Asan Nagar, Secular Gardens and nearby places request the Minor Irrigation Department and the corporation to take action.
Earlier last week, three people fell into the canal," said Mohan Ramakrishnan, a resident of Secular Gardens.
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