Module 11 Retention Basin Quiz

Which best describes the concept of retention in stormwater management?

Storing stormwater within the catchment to prevent its discharge to surface waters

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Slowly releasing stormwater to a nearby stream over 72 hours

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Filtering stormwater through vegetation before discharging to a river

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Conveying stormwater runoff rapidly to a detention pond

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Which of the following BMPs uses the same retention removal mechanism as a traditional retention basin?

Permeable pavement

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Wet detention pond

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Constructed wetland

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Any other that removes concentration

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How is treatment depth (TD) calculated for a retention basin?

Treatment volume divided by catchment area

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Catchment area multiplied by annual rainfall depth

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Storage depth of the basin at the outlet elevation

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Peak runoff rate divided by catchment impervious percentage

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For a 12-acre catchment with a treatment volume of 0.33 acre-feet, what is the calculated treatment depth?

0.33 inch

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0.66 inch

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1.0 inch

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0.27 inch

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Who developed the annual source of removal effectiveness tables for retention BMPs included in the 2024 Florida Applicant’s Handbook, Volume 1?

Harper (2007)

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Wanielista (1978)

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Florida DEP (2005)

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USEPA (2000)

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The annual removal effectiveness tables for retention BMPs assume that the treatment volume is infiltrated within how many hours after a storm event? ( in the applicant’s Handbook, Vol I.)

72 hours

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24 hours

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36 hours

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48 hours

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When a retention basin’s treatment volume recovers in 36 hours rather than 72 hours, what is the maximum estimated increase in annual removal effectiveness?

Approximately 3.5%

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Approximately 9%

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Approximately 7.5%

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Approximately 1%

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For retention basins in limestone areas where the treatment volume recovers in under 3 hours, what is the maximum upward adjustment to annual removal effectiveness compared to 72-hour recovery?

Up to approximately 9%

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Up to approximately 3.5%

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Up to approximately 15%

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Up to approximately 5%

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In the example project, entering 0.33 ac-ft of storage at 72-hour recovery into BMPFast yielded what annual removal percentage for both TN and TP?

65%

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80%

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90%

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50%

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What does the Plot button in BMPFast generate to assist designers?

A graph of annual removal effectiveness versus treatment depth that can be used for discovery of other options

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A table of pollutant loading by land use category

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A map of the catchment with BMP locations marked

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A hydraulic cross-section of the retention basin

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What does the Get Depth button in BMPFast allow a user to do?

Calculate the treatment depth and volume needed to achieve a target removal percentage

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Retrieve the maximum depth of the retention basin from GIS data

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Determine the water table depth below the basin bottom

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Compute the depth of sorption media required for groundwater protection

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For discharges to Outstanding Florida Waters (OFW), what is the required annual removal percentage for total phosphorus (TP)?

90%

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80%

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75%

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65%

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Which sorption media was selected in the example project within BMPFast for groundwater protection?

CTS24 (clay, tire crumb, and sand — ‘bold and gold’ media)

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Activated carbon filter media

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Iron-enhanced sand filter

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Zeolite-based ion exchange media

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In the example project, what minimum surface area of sorption media was calculated by BMPFast to treat up to 1.0 inch of runoff?

587.25 square feet

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1,174.5 square feet

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293.6 square feet

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2,700 square feet

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In the example project, what was the calculated service life of the sorption media based on a volume of 5,400 CF at 2 feet depth?

10.5 years

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5 years

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15 years

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8 years

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Module 11 Retention Basin Quiz

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