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Porous Asphalt Pavement


Quiz Questions

1. In the following figure what happens in step D?
PDH Course - Porous Asphalt Pavement
Precipitation is carried from roof by roof leaders to storage bed.
Stormwater runoff from impervious areas and lawn areas is carried to storage bed.
Stone bed stores water. Continuously perforated pipes distribute the stormwater from impervious surfaces evenly throughout the bed.
Stormwater exfiltrates from storage bed into soil, recharging groundwater.
2. Porous pavements are not normally designed to store and infiltrate all stormwater from all storms.
True
False
3. What is the bottom layer in the standard porous asphalt pavement structure?
Geotextile fabric
Stone recharge bed
Uncompacted subgrade to maximize the infiltration rate of the soil
None of the above
4. Which of the following are the general guidelines for the porous asphalt pavement design?
Soil infiltration rates of 0.1 to 10 inches/hour work best.
Limit the maximum slope of porous pavement surface to 5 percent.
Seasonal high water should be greater than two feet.
All the above
5. As a guideline for the porous asphalt pavement design, the stone recharge bed should be able to drain within 12 and 72 hours.
True
False
6. Although snow and ice tend to melt more quickly on porous pavement, it may still be necessary to apply de-icing compounds such as _____________.?
Salt
Sand
Ash
All the above
7. To prevent clogging of porous pavements it is recommended that they be vacuum swept _____________ per year.
Once
Twice
Thrice
Quarterly
8. Using the stone recharge bed for stormwater management for adjacent impervious areas such as roofs and roads can reduce project costs.
True
False
9. As a guideline for the porous asphalt pavement design, the maximum ratio of impervious to pervious area should be 5:1. For carbonate soils where there is a risk of sinkholes, the maximum ratio should be ________?
1:1
2:1
3:1
4:1
10. Porous pavements work best on flat or gently sloping areas. The slope of the surface should not exceed _______ percent.?
5
10
15
20
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