1) Heavy rainfall 2) Underground sewers and drains 3) Lack of vegetation cover 4) Prolonged rainfall 5) Steep ground 6) Clearing trees from the river valley 7) Building homes on floodplains 8) Saturated ground 9) Impermeable rock  10) Narrow bridge crossing 11) Widening and deepening of river channel 12) Permeable rock in the catchment area 13) Building a dam upstream 14) Tree planting in the catchment area 15) Light rainfall 16) Thin soil on ground surface 17) Warming temperatures leading to snow and ice melt

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