If it went down in the River to continue, increase the quantity of toxins which cause toxicity to aquatic organisms. A foul rotten smell rotten and foul occurred.
If dumped into the river To increase the amount of toxins that cause these substances are toxic to organisms in the water. The putrid smell, color and odor.
If dumped into the river. To increase the amount of pesticide that these substances cause intoxication with organisms in water, the foul. What color and smell foul.