Technical Results
Construction Impacts on Water Quantity
Construction | Post-construction
As the Traditional
subdivision was gradually transformed by adding a road,
driveways and houses, large increases in the volume of stormwater
runoff from the site were found. Stormwater runoff volume increased
(894%), as did runoff depth (1550%) from the traditional subdivision,
based on the calibration period regressions. Peak discharge rate
also increased by 400%. In contrast, as development occurred in
the LID subdivision, a decrease in the volume of stormwater
leaving the site was found (-97% for volume, -29% for depth). No
change was found for peak discharge rate in the LID subdivision.
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| Figure 1. Significant changes in runoff
volume (m3/week),
runoff depth (cm/week) and peak discharge (m3/sec/week)
as a result of construction.
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