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Stormwater Pit Size Equation:
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The stormwater pit size calculation determines the required volume capacity for stormwater pits in Australian conditions. It considers catchment area, rainfall intensity, and duration to ensure adequate water storage and management during storm events.
The calculator uses the stormwater pit size equation:
Where:
Explanation: The equation calculates the total volume of water that needs to be managed during a storm event, accounting for the catchment area, rainfall intensity, and storm duration.
Details: Proper stormwater pit sizing is crucial for effective stormwater management, preventing flooding, erosion, and infrastructure damage. Undersized pits can lead to overflow and property damage, while oversized pits may be unnecessarily costly.
Tips: Enter catchment area in square meters, rainfall intensity in millimeters per hour, and duration in hours. All values must be positive numbers for accurate calculation.
Q1: What is catchment area?
A: Catchment area refers to the total surface area that drains into the stormwater pit, including roofs, pavements, and other impervious surfaces.
Q2: How do I determine rainfall intensity?
A: Rainfall intensity data can be obtained from local meteorological data or Australian rainfall intensity charts specific to your region.
Q3: What duration should I use for calculation?
A: Duration depends on local storm characteristics. Typically, 1-2 hours is used for standard residential calculations, but consult local guidelines.
Q4: Are there Australian standards for stormwater pit sizing?
A: Yes, various Australian standards and local council requirements govern stormwater management. Always consult local regulations.
Q5: Does this calculation account for infiltration?
A: This basic calculation assumes no infiltration. For more accurate results, soil type and infiltration rates should be considered.