Compound Storm Catchment & Flood Cascade Simulator

Storm Succession Parameters

Storm Interval (Δt) 36 hrs

Storm 1 Peak Rain 38 mm/h

Storm 1 Duration 24 hrs

Storm 2 Peak Rain (Typhoon) 55 mm/h

Storm 2 Duration 30 hrs

Basin & Soil Moisture (SCS-CN)

Initial Soil Saturation 78 %

Catchment Drainage Area 45,000 km²

Reservoir & Spillway Dispatch

Active Pre-Discharge Drawdown

Pre-Discharge Lead Time 12 hrs

Pre-Discharge Gate Rate 1,200 m³/s

Synchronized Catchment Hydrograph & Storage Telemetry 96-Hour Horizon

Rainfall Hyetograph (mm/h)

Catchment Inflow (m³/s)

Combined Discharge (m³/s)

Reservoir Storage (%)

Soil Saturation (%)

Interactive Time Scrubber: T+48 hrs Normal Flow

Hourly Simulation Excerpt (T+36 to T+60 Peak Window)

Hour	Rain (mm/h)	Soil Sat (%)	Inflow (m³/s)	Outflow (m³/s)	Storage (%)	Spillway

Cascade Flood Risk Telemetry

Peak Discharge 9,840 m³/s Peak at T+48h

Max Reservoir Fill 96.4 % Spillway active > 90%

Final Soil Saturation 99.2 % AMC III Saturated

Spillway Duration 24 hrs T+42h to T+66h

Downstream Defense Alert Level

LEVEL 1 CRITICAL INUNDATION WARNING

Compounding storm rainfall over pre-saturated Min-Zhe catchment forced emergency uncontrolled spillway release.

Hydrological Physical Constants

Catchment Retention (S): 32.4 mm (AMC Dynamic Decay)

Reservoir Total Capacity: 1,250 MCM (Million m³)

Baseflow Equilibrium: 420 m³/s

Emergency Spillway Cap: 2,800 m³/s crest limit

Warning Level Threshold: 7,500 m³/s (Breached)

Civil water defense model verifying mass-balance continuity: \(\frac{dS}{dt} = Q_{in} - Q_{out}\). Based on empirical SCS-CN unit hydrograph convolution.