U.S. Department of the Interior (DOI) Hydrologist River Practice Questions

A river's flow rate is measured to be 150 cubic meters per second. If the cross-sectional area of the river is 50 square meters, what is the velocity of the water?

• AA. 3.5 m/s
• BB. 3.0 m/s
• CC. 2.5 m/s
• DD. 4.0 m/s

A new dam is proposed on a river. Which of the following factors should be considered in the environmental impact assessment?

• AA. Cost of construction
• BB. Local wildlife habitat
• CC. Distance to urban areas
• DD. Availability of materials

A hydrologist discovers that a river's temperature has increased over a period of time. What could be a potential environmental impact of increased water temperature?

• AA. Altered aquatic species composition
• BB. Reduced evaporation rates
• CC. Increased oxygen solubility
• DD. Decreased fish metabolism

A hydrologist is studying a river that experiences seasonal flooding. What might be one of the ecological benefits of this flooding?

• AA. Loss of aquatic habitat
• BB. Water pollution
• CC. Nutrient redistribution
• DD. Increased sedimentation