Environmental science
Water quality
Hydrology (agriculture)
Pollution
Pollutant
Total suspended solids
Alkalinity
Biochemical oxygen demand
Surface water
Point source pollution
Contamination
Total dissolved solids
Main river
Tributary
River ecosystem
Suspended solids
Chemical oxygen demand
Environmental engineering
Nonpoint source pollution
Wastewater
Ecology
Ecosystem
Geography
Chemistry
Biology
Geotechnical engineering
Organic chemistry
Cartography
Engineering
