Flood routing by the muskingum method essay

The principle of routing is used here for predicting the temporal and spatial distribution of hydrograph, during the course of its travel through the various sections of a stream Subramanya This Flood routing by the muskingum method essay of routing is necessary for: St Venant equations — Which require surveyed cross-sectional channel profiles and flow resistance data Out of these the Muskingum and Muskingum—Cunge methods are well established in the hydrological literature, and the modest data requirements make these procedures attractive even though more rigorous hydraulic models are available for unsteady flow routing.

According to this equation, the difference between inflow and outflow rates is equal to the rate of change of storage. At the time of flood, the total volume in storage can be divided into two categories: Mathematically the equation can be written as below: Simple like Muskingum-type approximations — Which have modest data requirements Complex like Muskingum—Cunge methods — Where the typically calibrated Muskingum routing parameters are related to physical and hydraulic characteristics such as reach length, flood wave celerity, unit width discharge and channel bed slope Highly complicated like the solution of the full dynamic flow i.

These methods follow a wide range of methodologies, which can be categorized as: The wedge storage is positive at the time of advancing flood, while it is negative in case of a receding flood. However, the wedge storage changes from positive to negative depending on the type of flood.

Introduction to Flood Routing

Flood-forecasting operations Flood-protection related work Hydrologic Channel Routing In case of reservoir routing, the storage is a function of output discharge, whereas in case of channel routing, the storage is a function of both inflow and outflow discharges.

Flood Routing The above equation considers the losses due to seepage, Flood routing by the muskingum method essay and direct accretion to storage, as small enough to be ignored.

This type of routing is considered very important for: The paper gives a general overview of the Flood routing concept and types, and then goes on to explain the Muskingum method in detail.

Prism storage — This is defined as the volume that would exist in case there is uniform flow at the downstream depth. This done by considering a channel reach i. Channel routing — In this type of routing, a study is made of the change in shape of a hydrograph as it travels down a channel. In a particular channel reach the water surface as expected is not parallel to the channel both.

When a river is in flood, the flow can be characterized as gradually varied unsteady flow. Figure below represents the pictorial relation between storage S and discharge Q: Designing the capacity of the spillway and other outlet structures Determining the correct location and size of capacity of the reservoir pertaining to a particular requirement condition.

This is the main reason why entirely different routing methods are needed for Channel routing. Muskingum Method Introduction Flood routing in open channels can be determined using a variety of modeling procedures.

Basic Principles of Routing All hydrologic routing methods use a common continuity equation as their common base. Hydrological routing — These methods mainly use the continuity equation Hydraulic routing — These methods combine the equation of continuity with the equation of motion for unsteady flow.

Tell us what you need to have done now! The results are used to predict the variation of reservoir elevation and outflow discharge with respect to time.

Introduction to Flood Routing Flood routing is a technique which is used to determine the flow hydrograph characteristics like shape and movement along a water course, and how these are affected by various factors like system storage and system dynamics on the shape and movement of flow hydrographs along a watercourse.

Additionally it also varies with time. Reservoir routing — In this type of routing, the effect of a flood wave entering a reservoir is studied.

Its modest data requirements make it attractive for practical use. The equation can be written in integral form as below: These methods can be divided into the following two categories:The performance of the calibrated Muskingum-Cunge flood routing method using observed hydrographs displayed acceptable results.

Therefore, the Muskingum-Cunge flood routing. An exact method of solution of the flood-routing equation, when the storage is a linear function of weighted inflow and outflow, is developed. This operation is shown to be equivalent to routing a multiple of the inflow through reservoir storage and.

Abstract The Muskingum flow routing method has been very well researched and established in the hydrological literature. Its modest data requirements make it attractive for practical use.

The paper gives a general overview of the Flood routing concept and types, and then goes on to explain the Muskingum method in detail.

The Muskingum method as explained above is a widely used hydrologic method for routing flood waves in rivers and channels. The standard procedure for applying the Muskingum method involves two basic steps: calibration and prediction. The Muskingum method is a hydrological flow routing model with lumped parameters, which describes the transformation of discharge waves in a river bed using two equations.

The first one is the continuity equation (conservation of mass) and the second equation is the relationship between the storage, inflow, and outflow of the reach (the discharge.

The Muskingum equation is frequently used for routing of floods in river channels The Muskingum method for routing flood waves in rivers and channels has been widely used in applied hydrology, since its first use in connection with a flood control project in the Muskingum County of Ohio about fifty years ago.

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Flood routing by the muskingum method essay
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