1. What is Dry Well Capacity Calculation?

Dry well capacity calculation determines the required volume of a dry well to effectively manage stormwater runoff. It considers the runoff volume and a storage factor to ensure proper drainage and prevent flooding.

2. How Does the Calculator Work?

The calculator uses the dry well capacity formula:

Where:

• \( V \) — Dry well capacity (m³)
• Runoff Volume — Volume of water to be managed (m³)
• Storage Factor — Multiplier accounting for soil absorption and safety margin (unitless)

Explanation: The formula calculates the necessary dry well size by multiplying the expected runoff volume by a factor that accounts for infiltration rates and provides a safety margin.

3. Importance of Dry Well Capacity Calculation

Details: Proper dry well sizing is essential for effective stormwater management, preventing property damage from flooding, and ensuring compliance with local drainage regulations.

4. Using the Calculator

Tips: Enter the calculated runoff volume in cubic meters and an appropriate storage factor (typically between 1.5-3.0). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical storage factor value?
A: Storage factors typically range from 1.5 to 3.0, depending on soil permeability and local regulations.

Q2: How do I calculate runoff volume?
A: Runoff volume is typically calculated using the rational method: Area × Rainfall Intensity × Runoff Coefficient.

Q3: What soil types are best for dry wells?
A: Sandy and gravelly soils with good permeability are ideal for dry wells, while clay soils may require larger storage factors.

Q4: How often should dry wells be maintained?
A: Dry wells should be inspected annually and cleaned as needed to prevent clogging and maintain proper function.

Q5: Are there limitations to dry well systems?
A: Dry wells may not be suitable in areas with high water tables, contaminated sites, or where local regulations prohibit their use.