Hawaii Hurricane Rainfall & Watershed Surge Simulator

Simulation Controls

Select Island System

Baseline Cyclone Rain 9.0 in

Forward Speed 8 mph

Moisture Inflow Heading 70° ENE

Antecedent Soil Saturation 75%

Hydrologic Scenario Presets

Topographic Orographic Rainfall Canvas Click Ridge or Basin to Probe

Manoa Stream Basin

Elev: 1,450 ft | Windward Lift: 2.1x

Computed Rain: 18.9 in

Windward Peak Rain

18.9 in

Leeward Rain Shadow

6.3 in

Peak Streamflow Discharge

14,250 cfs

Time to Soil Saturation

3.8 hrs

Flash Flood Threat Analysis

⚠️ Extreme Flash Flood Emergency

Steep volcanic gulches are exceeding bankfull capacity with critical debris flow risk.

High-Risk Drainages & Streams

Hydrograph Surge Curve