29-acre natural catchment area slated for residential development. The site’s topography is illustrated in Figure 1-1, and the planned development is shown in Figure 1-2. The layout preserves natural slopes, while residential lots slope at 2% for drainage. Stormwater will drain to a stream via a culvert under a southeast-side street.
The aim is to estimate post-development stormwater discharges at the catchment outlet, comparing them to pre-development conditions. Synthetic design storms with various return periods will be applied using the standard approach from stormwater drainage manuals.
Two models will be created: one reflecting the current state and another representing the fully developed condition. Initial discharge estimates will focus on overland flow without channelized flows. The subsequent example will introduce conveyance elements.
Figure 1-1
Figure 1-2
