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Field Size Formula:
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Septic field size calculation determines the appropriate area needed for a septic system's drainage field based on daily wastewater flow and soil absorption capacity. Proper sizing is crucial for effective wastewater treatment and environmental protection.
The calculator uses the field size formula:
Where:
Explanation: The calculation divides the daily wastewater flow by the soil's ability to absorb liquid to determine the required field size.
Details: Correct septic field sizing prevents system failure, protects groundwater quality, and ensures compliance with California environmental regulations. Undersized fields can lead to system backup and environmental contamination.
Tips: Enter daily flow in gallons per day and soil loading rate in gpd/sq ft. Both values must be positive numbers. Consult local regulations for specific soil loading rates in your area.
Q1: What is a typical soil loading rate in California?
A: Soil loading rates vary by soil type, ranging from 0.2 gpd/sq ft for clay soils to 1.2 gpd/sq ft for sandy soils. Always consult local regulations.
Q2: How do I determine daily flow?
A: Daily flow is typically based on number of bedrooms, with standard estimates of 150 gallons per bedroom per day in California.
Q3: Are there additional factors to consider?
A: Yes, including soil percolation rate, groundwater depth, slope, and local climate conditions may affect field sizing requirements.
Q4: Do California regulations require professional assessment?
A: Yes, most jurisdictions require a licensed professional to conduct soil tests and design septic systems according to local codes.
Q5: Can this calculator be used for final design?
A: This provides an estimate only. Final design must be completed by a qualified professional following local regulations.