EXPLANATION:Flooding occurs when there are excessive stream discharge and water spills of the channel onto the adjacent FLOOD plain in all the direction. The flooding of the river is an example of unsteady and non-uniform flow.There are many different TYPES of flow and are classified as below:Steady flow: it is defined as a type of flow in which the fluid characteristics like velocity (V), pressure (P), density (ρ), etc. at a point do not change with time.Steady flow is mathematically represented as\(\left (\frac{\partial V}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\),\(\left (\frac{\partial P}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\), \(\left (\frac{\partial ρ}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\)Unsteady flow: is defined as a type of flow in which velocity pressure or density at a point changes with respect to time.Uniform flow: is defined as a type of flow in which velocity at any given time does not change with respect to space (i.e., length of direction of the flow)uniform flow is mathematically represented as \(\left (\frac{\partial V}{\partial s} \right )_{t\ =\ constant} = 0\)\(\partial V\) = Change of velocity, \(\partial s\) = Length of flow in the direction sNon - uniform flow: is a type of flow in which velocity at any given time changes with respect to space. The other type of flow are as followsLaminar flow: is a type of flow in which the fluid particles move along well-defined paths or streamline and all the streamlines are straight and parallel. It is also called streamline flow or viscous flow. Turbulent flow: is that type of flow in which fluid particles move in a zig-zag way. due to the zig-zag movement of fluid-particle eddies formation take place which is responsible for high energy loss. Laminar and turbulent flow are determined by Reynolds number \(Re = \frac{ρ\ VL}{μ}\), where V = mean velocity of flow, μ = dynamic viscosity, L= characteristic dimensionFor PIPE flow if Reynolds number is less than 2000 then the flow is laminar, If Reynold number is more than 4000 flow is turbulent.Compressible flow: type of flow in which density of fluid changes from point to point. for compressible flow density, \(\rho\neq Constant\)Incompressible flow: type of flow in which density is constant.