<P> In Kyoto, Japan, the Hata clan successfully controlled floods on the Katsura River in around 500 A.D and also constructed a sluice on the Kazuno River . </P> <P> In India, Bangladesh and China, flood diversion areas are rural areas that are deliberately flooded in emergencies in order to protect cities . </P> <P> The consequences of deforestation and changing land use on the risk and severity of flooding are subjects of discussion . In assessing the impacts of Himalayan deforestation on the Ganges - Brahmaputra Lowlands, it was found that forests would not have prevented or significantly reduced flooding in the case of an extreme weather event . However, more general or overview studies agree on the negative impacts that deforestation has on flood safety - and the positive effects of wise land use and reforestation . </P> <P> Many have proposed that loss of vegetation (deforestation) will lead to an increased risk of flooding . With natural forest cover the flood duration should decrease . Reducing the rate of deforestation should improve the incidents and severity of floods . </P>

Which of the following is a method of controlling floods