1. What is Detention Pond Volume Calculation?

The detention pond volume calculation determines the required storage capacity for stormwater management using the fundamental formula: Volume = Runoff × Area. This calculation is essential for proper urban drainage design and flood control.

2. How Does the Calculator Work?

The calculator uses the basic detention pond volume formula:

Where:

• \( Volume \) — Required detention pond capacity (cubic feet)
• \( Runoff \) — Rainfall runoff depth (inches)
• \( Area \) — Drainage area (square feet)

Explanation: The formula calculates the total volume of stormwater runoff that needs to be temporarily stored in the detention pond during rainfall events.

3. Importance of Detention Pond Sizing

Details: Proper detention pond sizing is crucial for effective stormwater management, flood prevention, erosion control, and maintaining water quality in urban and suburban areas.

4. Using the Calculator

Tips: Enter runoff depth in inches and drainage area in square feet. Both values must be positive numbers. The calculator will provide the required detention pond volume in cubic feet.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between detention and retention ponds?
A: Detention ponds temporarily store stormwater and release it slowly, while retention ponds maintain a permanent pool of water for water quality treatment.

Q2: How do I determine the runoff depth?
A: Runoff depth is typically based on local rainfall data, soil type, land use, and storm frequency requirements specified by local regulations.

Q3: What factors affect detention pond sizing?
A: Key factors include watershed size, impervious surface percentage, soil infiltration rates, local rainfall intensity, and regulatory requirements.

Q4: Are there standard safety factors for pond design?
A: Yes, most jurisdictions require safety factors (typically 10-25%) to account for uncertainties in rainfall predictions and future land use changes.

Q5: How often should detention ponds be maintained?
A: Regular maintenance including sediment removal, vegetation management, and outlet structure inspection should be performed annually or as needed based on sediment accumulation.