Flood control in reservoirs and storage pounds

Sarginson, E.J.

doi:10.1016/0022-1694(73)90107-8

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The majority of the rapid routing methods depend upon the use of geometrical figures, such as a triangle [Wycoffand Singh, 1976;Colombi and Hall, 1977;Akan, 1990] or a trapezoid [West, 1974], or mathematical functions, such as the gamma distribution [Sarginson, 1973] or Pearson type III probability density function [Horn, 1987], to approximate the shape of the inflow hydrograph. With the former the relationship between the peak discharge rates of the inflows and outflows and the active storage volume follows directly from the geometry of the approximation.…”

Section: Routing Of Hydrographs Through Detention Facilitiesmentioning

confidence: 99%

An analytical probabilistic approach to sizing flood control detention facilities

Guo¹,

Adams²

1999

Water Resources Research

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Abstract. Flood control detention facilities have been traditionally designed using the design storm approach. Because of the deficiencies associated with the design storm approach, continuous simulation using long-term historical rainfall data has been recommended for the planning and design of these facilities in order to examine the performance of the system under a wide range of meteorological and hydrological conditions. An analytical probabilistic approach is presented as a computationally efficient alternative to continuous simulation. In this approach the probability distribution of the peak outflow rate from a detention facility servicing an urban catchment is derived from the probability distribution of the rainfall event characteristics that generate the runoff received by the detention facility. These derived mathematical expressions are used to determine analytically the storage-discharge relationship required for a detention facility to achieve the desired level of flood control. Comparison with long-term continuous simulation modeling demonstrates that the closed-form mathematical expressions of the analytical probabilistic approach provide reasonable approximation of the continuous simulation results. The analytical probabilistic approach overcomes some of the conceptual problems of the design storm approach and is therefore proposed for the planning and design of flood control detention facilities. IntroductionFlood control is usually the first and most important objective of urban storm water management. This is because flooding problems are widespread and are often accompanied by significant economic and environmental consequences. Next to protecting life and property, urban flood control also seeks to minimize the annoying and costly disruption caused by flooding in urban communities. Detention facilities are widely used for flood control purposes. They are designed to store temporarily storm water runoff at or near the point of origin, with a subsequent slow release to downstream channels or storm sewers, and therefore to minimize disruption and damage in downstream areas during both minor and major events. In addition to their primary surface water control function, detention facilities are often designed to provide, or be part of, sites for recreation purposes (e.g., incorporated into a park). Thus the storage areas of a detention facility are usually irregular in shape, and gravity-driven inflow to and outflow from the detention facility are usually most desirable.Some communities have storm water management regulations that specify that for a flood of specific return period the peak discharge rate after the development of a site shall not exceed the peak discharge rate from the site under existing conditions before the proposed development [Walesh, 1989]. Accordingly, some detention facilities are designed on the basis of a single return period criterion. That is, the design does not explicitly address performance under other more or less severe flood events. It is shown that for other t...

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Section: Routing Of Hydrographs Through Detention Facilitiesmentioning

confidence: 99%

An analytical probabilistic approach to sizing flood control detention facilities

Guo¹,

Adams²

1999

Water Resources Research

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“…Attempts to reduce the number of the encountered alternatives have been done in two hierarchic levels. In the basic level the routing equation may be replaced by the dimensionless routing equation [Sarginson, 1973;Kessler, 1983;Horn, 1987;Akan, 1989]. The reduction in the number of alternatives is achieved by the decrease in the number of parameters which appear in the dimensionless routing equation.…”

Section: Introductionmentioning

confidence: 99%

The efficiency function of detention reservoirs in urban drainage systems

Kessler¹,

Diskin²

1991

Water Resources Research

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Detention reservoirs in urban drainage systems are provided for reducing the peak flows downstream of the reservoir. The flow reduction is due to the storage volume of the reservoir in which the incoming flow is temporarily stored. The relationship between the peak reduction ratio (the peak outflow discharge to the peak inflow discharge) and the relative storage ratio (maximum volume stored in the reservoir to the volume of the inflow hydrograph) is evaluated in this study. This relationship, named the efficiency function, is derived by a numerical solution of the dimensionless routing equation. Using the three‐parameter gamma distribution to represent the inflow to the reservoir, the efficiency functions can be expressed by simple linear equations. Each equation depends on a single parameter whose value is determined by the reservoir configuration (depth‐storage relationship) and the type of the outlet device (e.g., spillway or culvert). The implementation of the efficiency function is most suitable for the preliminary design stage where a large number of alternative designs can be easily tested without performing the conventional routing procedure.

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“…The simplest scheme normally used for outlet devices only has spillways with uncontrolled crest and with a discharge law traceable to eqn (2). In this case, it is recognized that to discharge percentagewise small fl ow rates Q o , compared to the maximum predicted fl ow rate Q omax , it is necessary to contain a volume of water W i that is, percentagewise, considerable compared to the maximum storage volume W max .…”

Section: Outlet Work Studied On a Physical Modelmentioning

confidence: 99%

“…To reduce the effect of a fl ood wave corresponding to the previously examined hypothesis B, it is necessary to store a volume W max exceeding the water level Y L , representing a considerably greater percentage P = W max /D i of the total fl ow D i of the fl ood than in hypothesis A [2,3].…”

Section: Notes On Outlet Work and Flood Managementmentioning

confidence: 99%

“…It is also necessary to make sure that the water surface in the reservoir never exceeds the assigned level Y max corresponding to the maximum fl ood event. When a reservoir is employed both for the management of water fl ow and for the active protection of downstream areas (an occurrence that is notoriously becoming ever more common because of climate change) to reduce the fl ood wave impact, it is usually necessary to store a volume of water W max , exceeding the level Y L [2,3]. In this case, once the planning phase is completed, it is necessary to compare the increased building cost of a dam with the savings resulting from both outlet works and stream-bed protection works, to choose the most convenient outlet works.…”

Section: Introductionmentioning

confidence: 99%

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Outlet work optimization in flood control reservoirs

Ciaravino¹,

Ciaravino²

2012

Int. J. DNE

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An examination of the general and hydrological planning criteria for artifi cial reservoirs clarifi es the importance of choosing the correct type of outlet works both for stored volume management and for fl ooding events control. This choice becomes even more important, if we consider the effects of the climate change we have seen in recent years on extreme events. In this paper, the hydraulic operation of an extremely functional outlet work is studied using a physical model. The work is composed of an uncontrolled spillway and a mid-level outlet unifi ed into a single structure. In particular, it proves of extreme interest both in the lamination of fl ood events and also in reducing the global costs of outlet works. The tests have highlighted the outstanding hydraulic operation of the works under any condition and, in particular, when the spillway fl ow and the mid-level outlet fl ow converge into a single duct.

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Flood control in reservoirs and storage pounds

Cited by 8 publications

References 3 publications

An analytical probabilistic approach to sizing flood control detention facilities

An analytical probabilistic approach to sizing flood control detention facilities

The efficiency function of detention reservoirs in urban drainage systems

Outlet work optimization in flood control reservoirs

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