Which of the following swales would be able to carry the highest velocity?

Which of the following swales would be able to carry the highest velocity?

• A. Parabolic
• B. Triangular
• C. Trapezoidal
• D. Metamorphic

Answer: (C)

A trapezoidal swale is designed with side slopes that are often flatter than those of triangular swales, which helps to minimize the frictional resistance as water flows through it. The shape of a trapezoidal swale allows for a larger cross-sectional area compared to both parabolic and triangular shapes of the same top width, enabling it to carry a greater volume of water at higher velocities. Additionally, the flat-bottomed design of a trapezoidal swale can support more efficient flow dynamics, allowing water to travel more quickly than in swales with more pronounced shapes, such as parabolic or triangular swales. These characteristics make trapezoidal swales particularly effective for managing stormwater runoff and are often used in drainage systems due to their capacity to handle higher flow velocities without leading to erosion or overflow. In contrast, while parabolic and triangular shapes can be effective for specific applications, they generally do not facilitate the same flow capacity and velocity as a trapezoidal swale does. The term "metamorphic" does not apply in this context, as it refers to geological processes rather than specific hydrological design features. Thus, the trapezoidal swale stands out as the most suitable option for carrying higher velocities.

A trapezoidal swale is designed with side slopes that are often flatter than those of triangular swales, which helps to minimize the frictional resistance as water flows through it. The shape of a trapezoidal swale allows for a larger cross-sectional area compared to both parabolic and triangular shapes of the same top width, enabling it to carry a greater volume of water at higher velocities.

Additionally, the flat-bottomed design of a trapezoidal swale can support more efficient flow dynamics, allowing water to travel more quickly than in swales with more pronounced shapes, such as parabolic or triangular swales. These characteristics make trapezoidal swales particularly effective for managing stormwater runoff and are often used in drainage systems due to their capacity to handle higher flow velocities without leading to erosion or overflow.

In contrast, while parabolic and triangular shapes can be effective for specific applications, they generally do not facilitate the same flow capacity and velocity as a trapezoidal swale does. The term "metamorphic" does not apply in this context, as it refers to geological processes rather than specific hydrological design features. Thus, the trapezoidal swale stands out as the most suitable option for carrying higher velocities.