Non-technical Results
LID Subdivision
Construction | Post-construction
What happened in the LID subdivision as a result of construction?
Before construction, this area was an old gravel pit, with a wetland
in one section. As construction of the new subdivision began, practices
were utilized to keep as much stormwater runoff on the site as possible.
Due to these efforts, the stormwater runoff volume per
unit area from the site during construction was 29% less than
what ran off the undeveloped site! Imagine that the runoff before
construction is the small cylinder below (left). As a result of LID
construction practices, the stormwater running off the site decreased
to the size of the smaller cylinder!
 |
| |
LID runoff before construction. |
LID runoff due to construction:
A 29% decrease!
|
Although there was a large decrease in stormwater runoff, the amount
of some pollutants leaving the site did increase. Sediment
and phosphorus increased, due to some large rain events that caused
erosion in the grassed swales before they became established.
|
