Discharge coefficients for ogee spillways

Salmasi, Farzin; Abraham, John

doi:10.2166/ws.2022.129

Cited by 9 publications

(4 citation statements)

References 11 publications

(10 reference statements)

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“…In 2022, Salmasi and Abraham [38] analyzed the influence of the upstream slope of the spillway and the downstream submergence. Their results showed that, for all standard ogee spillways, the discharge coefficient (C) increases with increasing P/H, and then reaches a constant value.…”

Section: 𝑄 = 𝐶𝐿𝐻 /mentioning

confidence: 99%

Discharge Coefficients of Standard Spillways at High Altitudes

Rendón,

Sánchez-Juny,

Estrella

et al. 2024

Designs

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This paper presents an experimental campaign conducted next to the Condoroma dam, in Perú, at 4075 m a.s.l. The tests carried out in this paper were conducted in a 21 m long channel located at the toe of Condoroma dam. The setup consisted of a series of standard profile spillways with a vertical upstream face of up to five different dimensionless heights (P/Hd) ranging from 0.5 to 2. The experimental results indicated that, the P/Hd ratio influences the discharge coefficients in Condoroma, and P/Hd ≥ 1 values are recommended for the design of the spillway profile. In addition, for all the P/Hd ratios studied, the discharge coefficients adjusted to the Condoroma altitude were lower than those reported by classical formulations used in conventional spillway designs. Finally, a generalized equation is proposed to estimate the discharge coefficient for standard spillways located in dams at similar elevations above sea level.

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Section: 𝑄 = 𝐶𝐿𝐻 /mentioning

confidence: 99%

Discharge Coefficients of Standard Spillways at High Altitudes

Rendón,

Sánchez-Juny,

Estrella

et al. 2024

Designs

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“…More recently, in 2022, Salmasi and Abraham [34] analyzed the influence of the upstream slope of the spillway and the downstream submergence. Their results showed that for all standard ogee spillways, the discharge coefficient (𝐶) increases with increasing 𝑃𝐻 ⁄ , and then reaching a constant value.…”

Section: 𝑄=𝐶 𝐿𝐻 /mentioning

confidence: 99%

Discharge Coefficients of Standard Spillways at High Altitudes

Rendón,

Sánchez-Juny,

Estrella

et al. 2023

Preprint

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This paper presents the experimental campaign conducted near the Condoroma dam at 4075 m a.s.l. in an experimental setup consisting of a series of standard profile spillways with a vertical upstream face of up to five different dimensionless heights (P/Hd). The experimental results indicate that for all P/Hd ratios studied, the discharge coefficients adjusted to the Condoroma altitude are lower than those reported by classical formulations used in conventional spillway design. As a result, a generalized equation is proposed to estimate the discharge coefficient for standard spillways located in dams at similar elevations above sea level.

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“…Usually, on channels, the Reynolds number is large enough so the effect of viscosity can be neglected. Salmasi and Abraham's (2022) studies showed that the effect of the surface tension could also be ignored if the water head on the weir is higher than 3 to 4 cm. Thus, the Weber and the Reynolds numbers are removed from Equation (3).…”

Section: Dimensional Analysesmentioning

confidence: 99%

Experimental and Simulation Studies on Water Discharge Coefficients of Rectangular Piano Key Weirs

Rezaei¹,

Musavi-Jahromi²,

Khosrowjerdi³

et al. 2022

IJTech

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The piano key weir (PKW) is a developed type of labyrinth spillway with the ability to transfer large amounts of discharge by keeping executive costs constant. In this study, the parameters affecting the discharge coefficient of nine models were evaluated using physical models and simulations by Flow-3D software. The PKW models included: PK1.0, PK1.1, PK1.2, PK1.3, PK1.4, PK1.5, and PK1.6 representing the width ratios of the inlet (Wi) to outlet (Wo) keys of 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 and 1.6 respectively and the other two models were PKT (PK1.1 with a thicker wall) and PKTP (PK1.1 with a thicker wall and an enhanced crown). According to the results of experimental and simulation evaluations, the model of PK1.4 was selected as the optimal model, which increased the discharge rate by 30% compared to the control weir. Moreover, increasing wall thickness (PKT model) led to an increase in the discharge and installing a parapet wall (PKTP model) resulted in an increase in discharge and a uniform distribution of flow lines on the weir. Considering the superiority of models PK1.4, PKT, and PKTP, the geometric properties of these models can be used to optimize the design of PKWs.

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Discharge coefficients for ogee spillways

Cited by 9 publications

References 11 publications

Discharge Coefficients of Standard Spillways at High Altitudes

Discharge Coefficients of Standard Spillways at High Altitudes

Discharge Coefficients of Standard Spillways at High Altitudes

Experimental and Simulation Studies on Water Discharge Coefficients of Rectangular Piano Key Weirs

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