Question

I am having issues with questions 4,5,10 and 11, please.

Farth is S u id Torm? wuter on Earth Critical and 1. Which water reso access to fresh water in ical and Creative Thinking Questions ater resource problems likely played a role in the lack of to fresh water in developing nations such as Nigeria? If they d which approaches to water management uld be implemented, which approaches to water man and water conservation might improve access? fly describe the complexity of international water use. China? Explain your answer. aring the Rhine River and the Aral Sea examples. 8. Is the Clean Water Act related to the quality of U.S. public drinking water? Explain your answer. 9. Compare the benefits and drawbacks of China's Three Gorges Dam. Do you think the dam will do more harm or more good for 10-11. The graph reflects the monitoring of dissolved oxygen at six stations along a river. The stations are located 20 m (66 ft) apart, with A the farthest upstream and F the farthest downstream Sustainable Citizen Question Outline a brief water conservation plan for your own daily use. Consider both the quantity and quality of water you use. How could you use water more sustainably? poom True ON Oxygen concentration (mg dissolved OL water) a ded on Phapha Saunders (1920 Dissolved oxygen O ODY of he College P. 4. What role, if any, do aquifer depletion, overdrawing of surface waters, and salinization of irrigated soil play in the water problems associated with the High Plains Aquifer and the Colorado River Basin? How are these issues affected by drought and by development? 5. Explain whether each of the following represents point or nonpoint source pollution: fertilizer runoff, thermal pollution from a power plant, urban runoff, sewage from a ship, and erosion sediments from deforestation. Which is more difficult to control, nonpoint source or point source pollution? Why? What steps are taken in the purification of drinking water to kill disease-causing agents? 7. What roles, if any, do bacteria play in primary and secondary treatment of wastewater? A B C D E Upstream - Downstream Monitoring stations 10. Where along the river did a sewage spill occur? 11. At which station would you most likely discover dead fish? THE PLANNER 269 Critical and Creative Thinking Questions

Answer 1

Colorado River basin: When the aquifer depletion and overdrawing of water happens the both the ground water level and flowing quantity of water to river is decreasing. Salinization of irrigated soil is slowly converting river water to salt water.
High Plains Aquifer: The high plain aquifer depletion is caused by ground water level depletion which is caused by aquifer depletion.
The decreasing river water level in river automatically cause drought.
To develop the river conditions there is an agreement between US and Mexico that includes cooperative efforts to manage the river.
5. Fertilizer runoff is non point source of pollution because when runoff moves, it picks up and carries away natural and human-made pollutants, finally depositing them into lakes, rivers, wetlands, coastal waters and ground waters.
Thermal pollution from a power plant is a point source of pollution because it is originating from a particular power plant.
Urban runoff is nonpoint source of pollution because it is originating not from a particular source.
Sewage from ship: it is a point source of pollution, as the source of pollution is a ship.
Erosion sediments from deforestation: it is non point source of pollution because deforeatatio is destroying of a forest area not a particular point.
Point Source pollution is relatively easy to control because it comes from one obvious source.
10. Answer: The Region C to D along the river has sewage spill.
Explanation: Biochemical oxygen demand (BOD) value high indicates that a water body is contaminated with sewage. Between C to D region the BOD value is high.
11. Answer- Station E
Explanation: The lower concentration of dissolved oxygen level in water cause stress to aquatic life. Oxygen levels below 1-2mg/l in water for few hours can kill fishes. At station E dissolved oxygen level is low.