GENERAL GEOLOGY

Detailed explanation-1: -When rivers flood, sediment gets deposited on the floodplain. This sediment is called overbank deposits.

Detailed explanation-2: -New alluvial soil with more sand and silt than clay is being deposited in the flood plain areas along the river courses. Alluvial soil is also found in the higher areas above the flood plain covering a greater part of the Terai.

Detailed explanation-3: -Complete Answer: Most floodplains are formed by deposition on the inside of river meanders and by overflow. Wherever the river meanders, the flowing water erosions the river bank on the outer side of the meander, while the sediments are simultaneously deposited in a point bar on the inside of the meander.

Detailed explanation-4: -A flood can develop in a many ways. The most common is when rivers or streams overflow their banks. These floods are called riverine floods. Heavy rain, a broken dam or levee, rapid icemelt in the mountains, or even a beaver dam in a vulnerable spot can overwhelm a river and send it spreading over nearby land.

Detailed explanation-5: -An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms.