HEAVY RAIN - This weather condition is the most common cause of flash floods., DEFOREST - Cutting down trees leads to less water absorption by the soil., POOR DRAINAGE - Water can’t flow away if this system is not working well., ILLEGAL DUMPING - Throwing waste in rivers and drains causes blockages., RAINSTORM - A storm with heavy rain., CONSTRUCTION - Development work that often blocks natural waterways., THUNDER - The loud sound that comes with storms and lightning—often a sign of heavy rain., CLOGGED DRAINS - When trash or leaves block the flow of water, causing it to back up.,

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