$**$Storm$-$Sewer Inlet Size and Flow Rate in Civil Engineering$**$

Storm$-$sewer inlet size and flow rate are important considerations in the design of stormwater drainage systems in civil engineering. These factors determine the capacity of the inlet to capture and convey stormwater runoff, preventing flooding and minimizing potential damage to infrastructure.

Here is a brief explanation of storm$-$sewer inlet size and flow rate:

$1.**$Inlet Size$**$: The storm$-$sewer inlet size refers to the physical dimensions and opening area of the inlet structure. It determines the amount of water that can enter the stormwater drainage system at a given time. Inlet sizes are typically designed based on the anticipated flow rate and the area of the contributing drainage area.

$2.**$Flow Rate$**$: The flow rate is the volume of water passing through the storm$-$sewer inlet per unit of time. It is influenced by factors such as rainfall intensity, duration, and the size of the contributing drainage area. Proper estimation of the flow rate is essential for designing the stormwater drainage system to ensure that the inlet can handle the expected volume of runoff without causing flooding or overloading the system.

Inlet size and flow rate are interconnected. A larger inlet size allows for a higher flow rate capacity, enabling the system to handle larger volumes of stormwater runoff. However, it is important to balance the inlet size with the hydraulic capacity of downstream pipes and channels to prevent excessive flow velocities and erosion.

Objective Question:

Based on the information provided, here's an objective question for you:

Why is it important to consider storm$-$sewer inlet size and flow rate in the design of stormwater drainage systems?

A$)$ To prevent flooding B$)$ To increase rainfall intensity C$)$ To reduce the size of the drainage area D$)$ To minimize erosion in downstream channels

Please select the correct answer from the given choices.