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.

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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