Is: a prototype view of the OSM road network and OSM tag-quality checks Floodtrace runs
before analysis — routing-profile filtering (resident vs. emergency access) and water-crossing
structure tagging, for two example NL towns.
Isn't: official data (OSM only — a real deliverable uses BGT/NWB/GWSW as the source of
record, see docs/METHODOLOGY.md §1); not a live client report. Terrain is flat in this
prototype; buildings are lowered to the city's average ground level, so they may sit slightly
high or low where the ground slopes.
—
Network quality
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Return period: how rare the event is expected to be — T100 means roughly a 1-in-100
chance in any given year, not "once every 100 years on the dot".
Residents: normal traffic rules.
Emergency services: may pass gates and one-way streets.
Reachability counts toward:
Roads & buildings — max depth
≤ 0.05 m
0.05–0.10 m
0.10–0.20 m
0.20–0.30 m
> 0.30 m
impassable (dashed)
Neighbourhood reachability
all selected categories reachable
most reachable
some reachable
none reachable
Transit
intact
disrupted (dashed)
Neighbourhood reachability is only computed for wateroverlast scenarios (see manifest.json's
reach_scenarios) — not this one.
What this is / isn't
Is: road/building/transit exposure and neighbourhood reachability under DPRA
pluvial stress-test scenarios (35/70/140 mm) and LIWO overstroming (levee-breach-scale
max flood depth) — the same depth-classification method as floodtrace expose/
reach, see docs/METHODOLOGY.md.
Isn't: a routed evacuation-time estimate (reachability here is unweighted connectivity,
screening-level); OD points are unverified OSM proposals, not a client-confirmed facility list.
Mitigation ideas
Delivery partners
Your preferred engineering firm (set at intake)
Partner A
Partner B
—
Flood scenarios
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Use the draw tools (top right of the map) to draw a new road, or a polygon for:
Click a road to close or raise it.
Nothing selected.
—
Designer (concept). Click a road to close or raise it, draw a new road (snapped to
the nearest nodes), or draw a development/retention polygon. Everything here is a screening-level,
client-side re-run — not a routed or hydraulic result.
Reachability
Network/buurten data failed to load for this city.
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Coming soon: Water balance
Twente swings between the extremes of flooding and drought. The same retention measures serve
both — and we track subsidence and vegetation stress across both.
—
Water balance
Coming soon: Water balance. Twente swings between the extremes of flooding and drought. The
same retention measures serve both — and we track subsidence and vegetation stress across
both.
Layers
About & credits
Floodtrace is a prototype built on open standards and open-source components.