WHEN the challenge came to clean up one river in the state, the Selangor Drainage and Irrigation Department (DID) took its chances with the most polluted river it could find — Sungai Penchala in Petaling Jaya.
The river became part of the One State One River programme for rehabilitation that aims to increase the water quality from Class 4 (badly contaminated) to Class 2 (clean but needs treatment).
