Technical Results
Post-construction Impacts on Water Quantity

Construction  |  Post-construction

After all of the impervious surfaces were installed and construction ceased in the Traditional subdivision, the volume, depth and peak discharge of stormwater leaving the site increased significantly (Figure 1). In contrast, after construction finished in the LID subdivision, stormwater runoff volume significantly decreased from pre-construction levels. These changes can also be seen in the hydrograph below (Figure 2), which is representative data from a single September storm.

Figure 1. Significant changes in runoff volume (m3/week), runoff depth (cm/week) and peak discharge (m3/sec/week) after construction was completed. Figure 2. Hydrograph of all three subdivisions in project, showing the larger volume and rate of runoff from the traditional and control subdivisions, as compared to the LID.

 



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