In the case of Pakistan, the major cause of floods is improper WATERSHED MANAGEMENT in the catchement areas of the major rivers. If we want to reduce the incidents of floods, we will have to reduce the population pressure in these areas, increase the vegitation cover to protect the fragile soil and adopation of eco-friendly farming.
We need lot of forests in our northren areas, Kashmir and KP as these are the catchment areas of our rivers. The trees slow the intensity of rain by covering the bare land and their roots hold the soil in case of flash floods. This way the water is slowly absorbed in the ground and released in the shape of springs during summer months, instead of causing floods in the lowlands.
On the other hand, in plain areas, big DAM are needed to hold the excess water during floods and this excess water is used in dry season for irregation purposes through canals.

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/// Aur be ghum hain zamanay main muhabat kay siwa ///