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

The process of adding chemical treatment to stormwater

Answer

The installation of stormwater infrastructure modifications after construction

Answer

Modifying a hydrograph by adding riprap

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

Storing large volumes of runoff underground

Answer

Chemically treating heavy metals in runoff

Answer

Preventing any stormwater from leaving the site

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

Repainting the manhole covers annually

Answer

Increasing the design storm return interval

Answer

Adding sodium hypochlorite to control biological growth

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

To replace the need for any physical BMPs on the site

Answer

To satisfy OSHA safety requirements for the construction crew

Answer

To provide proof of final stabilization to the local government

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

Increase total impervious surface area on a site

Answer

Filter pollutants from groundwater

Answer

Increase peak discharge from the building footprint

Question 6

An inspector discovers that a post-construction wet pond outlet's trash rack is missing. The most important reason to replace it immediately is to:

Accepted Answer

Prevent debris from blocking the outlet pipe, which could cause uncontrolled overflow and embankment failure

Answer

Improve the aesthetic appearance of the pond

Answer

Meet local landscaping ordinance requirements

Answer

Reduce aquatic vegetation growth inside the barrel