The dispute over water resources between Kedah and Penang took a curious turn when in December last year, the K.edah Menteri Besar said he would get villagers to put sandbags to dam Sungai Muda and divert the river so that it no longer flowed into Penang.Muhammad Sanusi Md Nor's has since also threatened to send muddy water to Penang.What is the heart of the dispute? Melisa Idris and Sharaad Kuttan speak to Professor Dr Chan Ngai Weng, President, Water Watch Penang.