What is the Flood Evacuation multi-solver?

Flood Evacuation is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.

Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.

Earth & First Responders Pack · Multi-Solver

Flood Evacuation

Inundation & routing. This multi-solver chains 2 solvers into a single guided workflow — run each step in order and carry the result forward.

Workflow steps

groundwater
→evacuation

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Groundwater

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Groundwater Well DrawdownLive

Thiem steady-state cone of depression

Controls

Presets

Pumping rate Q (m³/day)

Transmissivity T (m²/day)

Radius of influence R (m)

Pumping a well lowers the water table into a cone of depression. Under the Thiem steady-state solution the drawdown is s(r) = Q/(2πT)·ln(R/r): more pumping deepens the cone, higher transmissivity flattens it. Fundamental to well design, water supply, and contaminant capture.

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Data Inspector

Drawdown at well4.7 m

Drawdown at 50 m1.47 m

Radius of influence500 m

Governing equation

s (r) = \frac{Q}{2 π T} ln \frac{R}{r} = \frac{2000}{2 π \cdot 500} ln \frac{500}{r}

Reading this result: Drawdown is Q/(2πT)·ln(R/r): here it is about 4.7 m at the well and falls off logarithmically, so most of the depression sits in the first tens of metres.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

↓

Evacuation

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Building Evacuation / EgressLive

crowd flow through exits

Controls

Presets

Occupants

Exits

Walk speed

Speed1×

Occupants head for the nearest exit while pushing apart in crowds, so bottlenecks and congestion form at doorways — the effect that drives real egress times. Add or remove exits to see how total clearance time responds. Planning aid only.

▶ Run in Python

Data Inspector

Evacuated0 / 150

Clear time0.0 s

Exits2

Social-force velocity

v = 1.3 \overset{e}{^}_{exit} + 2.2 j \sum f_{ij}, \frac{N}{exits} = \frac{150}{2} = 75

Reading this result: Around 75 per exit — congestion starts to build at the doors, and adding an exit usually helps more than speeding people up.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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More in the Earth & First Responders pack

Climate Scenario Model Watershed & Flood Kit Air Quality Model Coastal Erosion Groundwater Contamination Solar & Wind Site Wildfire Risk Map Glacier Mass Balance

Frequently asked questions

What is the Flood Evacuation multi-solver?: Flood Evacuation is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.
Is it free to use?: Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.