Realising that the St. Ann's River, prone to flooding, was impeding the expansion of the town, Chacón had its course diverted in 1787 so that it ran to the east of the city, along the foot of the Laventille Hills. (During the rainy season the river still had a tendency to overflow its banks, flooding parts of the city; over the decades its channel would be widened and paved. During the dry season the water level drops to a trickle; hence its nickname, the East Dry River.) Port of Spain was now able to continue spreading northwards and westwards, encroaching on the surrounding sugar-cane plantations.