The table shows the estimated costs over a 40 year period for a green roof and a traditional roof. Use the table to answer the question.
Traditional Roof Green Roof
Initial Installation $25.00 per square foot $34.00 per square foot
Care and Maintenance $19.00 per square foot $30.00 per square foot
Savings from Insulating Effect N/A $5.00 per square foot
Reduction in Repair Costs N/A $6.00 per square foot
Replacement Cost $25.00 per square foot N/A
Which roof type provides a cost benefit over the 40 year period and how much is that benefit?
A. The green roof provides a cost benefit of $16.00 per square foot.
B. The traditional roof provides a cost benefit of $6.00 per square foot.
C. The traditional roof provides a cost benefit of $9.00 per square foot.
D. The green roof provides a cost benefit of $11.00 per square foot.
The green roof provides a cost benefit of $16.00 per square foot over the 40 year period.
To calculate:
Traditional Roof:
Initial Installation: $25.00 per square foot
Care and Maintenance: $19.00 per square foot x 40 years = $760.00 per square foot
Replacement Cost: $25.00 per square foot
Total cost = $25.00 + $760.00 + $25.00 = $810.00 per square foot
Green Roof:
Initial Installation: $34.00 per square foot
Care and Maintenance: $30.00 per square foot x 40 years = $1,200.00 per square foot
Savings from Insulating Effect: $5.00 per square foot x 40 years = $200.00 per square foot
Reduction in Repair Costs: $6.00 per square foot x 40 years = $240.00 per square foot
Total cost = $34.00 + $1,200.00 - $200.00 - $240.00 = $794.00 per square foot
Therefore, the cost benefit of the green roof over the 40 year period is $810.00 - $794.00 = $16.00 per square foot.
Answer: A. The green roof provides a cost benefit of $16.00 per square foot.
Which of the following are possible costs of flood mitigation efforts? Select the two correct responses.
A. reduction in tourism
B. ongoing maintenance
C. reduction of the number of levees
D. more need for sandbagging
E. relocation of homes
B. ongoing maintenance
E. relocation of homes
Possible costs of flood mitigation efforts include ongoing maintenance of flood control infrastructure and the relocation of homes to safer areas.
How does implementing green spaces help a city to manage flood damage?(1 point)
Responses
A. by rerouting water to streams and rivers
B. by absorbing floodwater into soil
C. by increasing the flow of water to drains
D. by reducing the impact of ocean waves
B. by absorbing floodwater into soil
Implementing green spaces helps a city manage flood damage by providing areas where the excess floodwater can be absorbed into the soil, reducing the risk of flooding in urban areas.