Which of the following is best used to check flooding in coastal low lands?

The best method to check flooding in coastal lowlands is channelisation. This involves the construction of channels or artificial waterways to control the flow of water in a particular area. In coastal lowlands, the land is often flat, and the water from rainfall and other sources may accumulate and cause flooding. Channelisation helps to divert the excess water to a specific location, such as a river or a reservoir. This reduces the risk of flooding and also provides a source of water for irrigation and other uses. Contour ploughing, strip cultivation, terracing, and excavation are all methods used in agriculture to conserve soil and prevent erosion. However, they are not as effective in controlling flooding in coastal lowlands as channelisation.