CESSWI CESSWI Post-Construction BMP Maintenance and Long-Term Controls 2

Question 1

In the context of post-construction stormwater management, what does 'hydromodification' refer to?

Accepted Answer

Changes in the natural hydrologic cycle (peak flows, runoff volume, duration) caused by land development

Answer

Hydromodification describes how impervious surfaces and altered drainage increase peak flows, total runoff volume, and flow duration compared to pre-development conditions, degrading stream channels.

Question 2

A vegetated filter strip used as a post-construction BMP functions primarily by:

Accepted Answer

Slowing sheet flow and allowing settling and infiltration of runoff from adjacent impervious areas

Answer

Vegetated filter strips use dense grass or other vegetation to slow shallow sheet flow, promote infiltration, and physically filter out sediments and other pollutants before runoff enters a water body.

Question 3

Which maintenance activity is most critical for ensuring continued function of an underground stormwater infiltration system?

Accepted Answer

Removing accumulated sediment from pretreatment devices to prevent clogging of the infiltration media

Answer

Sediment accumulation in upstream pretreatment structures (catch basins, forebays) is the primary cause of infiltration system failure; regular cleanout preserves the system's ability to percolate stormwater.

Question 4

Under many MS4 (Municipal Separate Storm Sewer System) permits, what is the purpose of requiring a Stormwater Pollution Prevention Plan (SWPPP) for post-construction activities?

Accepted Answer

To document long-term maintenance responsibilities, inspection schedules, and ownership of post-construction BMPs

Answer

Post-construction SWPPPs or equivalent O&M agreements create a legally binding record of who is responsible for maintaining BMPs and how often inspections and maintenance must be performed.

Question 5

Green roofs are considered a post-construction LID BMP because they primarily:

Accepted Answer

Retain rainwater in a growing media layer, reducing and delaying roof runoff to the storm sewer

Answer

The saturated growing medium on a green roof absorbs rainfall, which is then returned to the atmosphere through evapotranspiration, reducing the volume and peak rate of runoff from the roof.

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

CESSWI CESSWI Post-Construction BMP Maintenance and Long-Term Controls 2