Every pipe elevation here is inferred — grade minus an assumed 5 ft cover — because the county's invert field is empty on 6,604 of 6,612 segments. Pipes render hatched for that reason. The 3,054 surveyed rims are the only real vertical control in the drainage layer.

This is a screening-level visualiser, not a hydraulic model. It is a bathtub-plus-drainage-capacity representation — not MIKE, HEC-RAS or XPSWMM. An engineered model would differ on pipe surcharge timing, overland flow routing, and tidal phase.

Groundwater is an initial condition, not a solved subsurface flow field. The water table is drawn as a plane at the observed median for the selected season, interpolated from 31 USGS sites of which one is inside the area. Real heads vary spatially and lag rainfall.

Storm ponding is a uniform depth scaled by the Atlas 14 depth and reduced by whatever drainage capacity remains once the water table is accounted for. It does not route water downhill between cells.

Floor elevations are estimates. 77% have no local observational basis — see the method.

No structural or parcel-level damage is implied. Water touching a building in this view means modelled stage exceeded an estimated floor elevation, nothing more.