What is flood routing through reservoir?

Flood routing is the process of determining the timing and shape of a flood wave. In a reservoir, this is done by accounting for the storage available in the reservoir, whereas in a channel, the flood wave is observed at successive points along a river.

Which three things does flood routing accomplish?

Flood routing impacts the magnitude of the peak discharge, the time of the peak discharge, depth and extent of flooding, and environmental factors such as stream bank erosion, floodplain scour, sediment transport, and deposition.

What is reservoir routing?

Reservoir routing is actually simply the numerical solution of a differential equation. Any standard method can be used, and all are simpler than the traditional method. The presentation incorporates the case where reservoir outflow may be varied by control of valves or spillway gates.

What is the importance of flood routing?

Flood routing is important in the design of flood protection measures, to estimate how the proposed measures will affect the behavior of flood waves in rivers, so that adequate protection and economic solutions may be found. Flood routing procedures may be classified as either hydrological or hydraulics.

What are types of flood routing techniques?

Contents

• 1 Hydraulic (or distributed) routing.
• 2 Hydrologic (or lumped) routing.
• 3 Semi-distributed routing.
• 4 Flood routing.
• 5 Runoff Routing.
• 7 References.

What is difference between reservoir routing and channel routing?

In reservoir routing the effect of a flood wave entering a reservoir is studied. In channel routing the change in the shape of a hydrograph as it travels down a channel is studied.

What is the difference between reservoir routing and channel routing?

What is flood routing of a reservoir explain the basic flood routing equation?

In hydrology, routing is a technique used to predict the changes in shape of a hydrograph as water moves through a river channel or a reservoir. In flood forecasting, hydrologists may want to know how a short burst of intense rain in an area upstream of a city will change as it reaches the city.

What critical factors affect the flood routing?

Physical factors affecting flood hydrograph dynamics

• Shape. A circular shaped drainage basin leads to rapid drainage whereas a long drainage basin will take time for the water to reach the river.
• Topography & relief.
• Heavy Storms.
• Lengthy rainfall.
• Snowfall.
• Vegetation.
• Rock type.

What is the basic equation used for flood routing by hydraulic method?

Hydraulic Routing ⇒ These methods employ equation of motion of unsteady flow and equation of continuity. The basic differential equations used in hydraulic routing known as st. venant equations afford better description of unsteady flow that hydrologic methods.

What are the basic equations used for flood routing by hydraulic method and hydrologic method?

If we consider some hydrologic system with input I(t), output O(t), and storage S(t), then the equation of continuity in hydrologic routing methods is the following: dt dS I −O = If the inflow hydrograph, I(t) is known, this equation cannot be solved directly to obtain the outflow hydrograph, O(t), because both O and S …

What are the types of flood control reservoirs?

Explanation: There are two basic types of flood-mitigation reservoirs i.e. storage reservoir and retarding reservoirs. Storage reservoir is the one having gates and valves installed at its spillway and at its sluice outlets whereas the retarding basin is the one with uncontrolled and ungated outlets.

What is flood routing in a reservoir?

In Module 111, you learned that flood routing is the process of determining the timing and shape of a flood wave. In a reservoir, this is done by accounting for the storage available in the reservoir. In a channel, the flood wave is observed at successive points along a river. The storage and outflow are interdependent.

What is the relationship between outflow and storage in a reservoir?

Ō = average rate of outflow during the time interval ∆S = change in volume of storage during the time interval The treatment of reservoir routing in this module is based on the assumption that the reservoir is level. This means that both the outflow and the storage depend only on the water level in the reservoir.

What is the continuity equation used in reservoir routing?

The continuity equation used in reservoir routing observes the principle of conservation of mass. For a given time interval, the volume of inflow minus the volume of outflow equals the change in volume of storage. The equation is often written in one of the two forms given below.

How is flow routing carried out in the Sabarmati river?

Using the data about the releases from the Dharoi reservoir for the past flood events, flow routing in the Sabarmati River was carried out from Dharoi/Derol up to Ahmedabad. The Muskingum-Cunge method (Ponce, 1989) of flood routing was used in this study.