Stormwater & the built surface
The runoff a campus-scale impervious surface adds to the design storm.
A campus-scale impervious surface changes what a design storm does downstream. A real impact study routes that change down the reach. This site has a committed reach table of 8 navigated reaches. That table is the real river geometry this chapter's screen would route down. The routed design storm is not computed yet, because no cited runoff parameters are on the record for this basin. Those parameters are the contributing areas, the curve numbers, and the times of concentration. The study does not fabricate them. Committing that cited set is what lights the routed model.
Reach-network river centerlines (NHDPlus via USGS NLDI)
- Centerline geometry is real NHDPlus, display-only — no reprojection/simplification.
- Mainstem/tributary reach boundaries are a proportional cut by reaches.yaml lengths.
- Tier-0 screening geometry for the FlowLayer viz; not a calibrated hydraulic network.
The flow annex — the reach network →
The record behind this chapter
What this chapter stands on: the records it reads, the inputs its modeled figures rest
on, and the reference data behind its baselines — the same pages the record screens
serve, not a second copy. A figure the record does not support stays [open] and links nothing.