Question

how are flodes benified to agriculture​

Answer 1

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Floods cause disasters, but they can also be beneficial. Whenever a river overflows its banks, it dumps sand, silt and debris that it has carried downstream onto the surrounding land. After the flood waters move away, the soil is more fertile, because of the organic matter and minerals in this material. Inundation of the flood plains helps recharge the groundwater, which is an important source of drinking water and is essential for agriculture. Surface runoff and flooding can help wash down pollutants and contaminants deposited on land caused by the intensive use of pesticides and fertilizers.

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Answer 2

Answer:

correct answer

Explanation:

While floods are often framed as harmful and destructive, they also have many positive impacts and provide benefits for people and nature.

In sub-Saharan Africa, an estimated 25 million hectares are already being irrigated with floods, in various ways. With a mean plot size of 0.5 hectare, it can be assumed that about 50 million people directly practice and benefit from flood-based farming.

Flood-based farming is also common in Asia, where it yields greater productivity and supports larger populations than what is reported for Africa. This discrepancy is primarily due to better management and more diverse uses of floods in Asia.

But, the use and management of floods can be improved, by implementing relatively low-investment and low-skill interventions, to boost agricultural productivity in sub-Saharan Africa.

Types of flood-based farming systems

Flood-based farming is possible in areas that regularly receive floods, which can form the basis for productive farming systems, such as crop cultivation, livestock grazing or fishing grounds.

Four main types of flood-based farming systems have been identified:

Floodplain agriculture, which is the most common type of flood-based farming in sub-Saharan Africa, and where either receding or rising floodwaters provide water for crop cultivation.

Spate irrigation, in which floodwater from mountain catchments is diverted from normally dry riverbeds and spread over large areas for irrigation, improvement of grazing areas, filling of drinking water ponds and groundwater recharge.

Inundation canals, which are situated next to rivers or floodplains and are fed by water when rivers rise. The canals are then used to divert the water to nearby farmland.

Depression agriculture, in which shallow depressions are filled when the groundwater level rises on a seasonal basis. They can provide enough moisture to support grazing in the dry season and crops grown without irrigation.