Question: A) Identify TWO specific pollutants in storm-water runoff that degrade the quality of

surface water.

Answer: - Nitrogen/Nitrates/NO2

• Phosphorus/Phosphates/PO4

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• Question: B) Calculate the volume of water (in m3

• ) that runs off the Shoppes at Fremont parking lot

• after a 5 cm rainfall event. Assume that all the water that falls on the parking lot runs

• off.

• Answer: 200 x 100 = 20,000m2

5cm x 1m/100cm = .05m

200m x 100m x .05m = 1000m3

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Question: C) Calculate the volume of storm-water runoff (in m3

) generated in all of Fremont by the 5

cm rainfall event. Assume that only the impervious surfaces generate runoff.

Answer: 5cm x 1/100cm = .05m

10km x 1x10^6 m^2/1km^2 = 10,000,000 m^2

.05 m x 1 x 10^7m^2 x .20 = .20 = 100,000m^3

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Question: D)Assume that all the runoff that you calculated in part (c) is captured by the storm

sewers in one day. Calculate the volume of untreated water (in m3

) that bypasses the

plant as a result of the storm

Answer: 100,000m3 + 5,000m3 - 10,000m3 = 95,000m3

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Question: E) Describe two ways that the volume of storm water runoff can be reduced

Answer: - Using rooftop gardens to use rainwater

• Creating basins/ponds to hold storm water

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• Question: F) Describe one environmental problem (other than pollution from runoff and from

• untreated sewage) that results from having extensive paved areas.

• Answer: Habitat fragmentation caused by roads dividing habitat into smaller areas

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