Surat has no cascade view, and that is a judgement about the city rather than a missing dataset. The cascade layer reconstructs chained tank systems - the Tamil kanmoi networks and the Bengaluru kere chains, where each tank's surplus was engineered to feed the next over centuries. Surat's water bodies are coastal wetlands, tidal creeks and urban talavs on a flat estuarine plain. The algorithm would find downhill neighbours here because it always does, and drawing them as a cascade would assert an inheritance the city does not have.