hello, 

i have 2 unit Critical thinking questions 3&4

Critical thinking Unit 3 :

1. Water is a molecule of life, improving water quality in Anacostia is improving quality of life of DC residents. What is your take on this statement?

2.Controlling water pollution is controlling human activities. Justify.

3.Describe the effect of untreated wastewater on the chemical, physical and biological quality of urban streams or rivers.

  4.  What are the processes that increase or decrease dissolved oxygen in a river?

  5. Mark did bio-monitoring in A, B and C streams and found the following result. Which stream is in good quality, fair and  polluted status?

  Species

Stream A

Stream B

Stream C

Mayfly

90%

20%

0%

Dragonfly

10%

80%

80%

Leech

0%

0%

20%

Critical thinking Unit 4 :

1.Explain how reducing storm runoff reduce pollution load into the river.

2.Describe possible relationship between urban population density and urban runoff.

3.What is the effect of higher number of automobiles on storm water runoff?

4.What is the current storm water runoff policy or incentive to reduce the impact of runoff in DC?

5. Describe the impact of impervious parking lots on urban runoff.

6. Describe the relation of impervious surface and combine sewer over flows? 


class_3_water_quality_assessment.pdf

class_4_urban_wastewater_system.pdf

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