Differential Urban Twin Catchment Simulator
Differential Diagnosis in Action
Toggle calibrated urban twin scenarios to see how differential spatial analysis eliminates rainfall confounds to isolate exact structural hydraulic bottlenecks.
Calibrated Twin Pairs:
Comparative Axis
Anna Nagar (Ward 101) vs Velachery (Ward 102)
Twin Fitness
83.2%
Causal Diagnosis Finding
Despite experiencing virtually identical cloudburst rainfall (390mm vs 382mm), Anna Nagar inundated due to downstream stormwater drain backwater stagnation and a local elevation depression.
🌧️ Rainfall Differential
+2.1% (Near-Identical Cloudburst)
Storm forcing neutralized
🚰 SWD Drain Conduit Capacity
-38% Effective Outfall Gradient
Primary structural constraint
⛰️ DEM Elevation Gradient
-1.4m Micro-depression Basin
Micro-depression ponding
🏙️ Urban Impervious Cover
+14% Built-up Impervious Surface
Loss of natural infiltration
Synthesized Mechanism RankingDEFENSIBLE
Rank #1 Primary Driver88% Confidence
Downstream SWD Backwater & Outfall Congestion
Rank #2 Surface Infiltration Exhaustion62% Confidence
Rank #3 Secondary Canal Tidal Hold31% Confidence