Sewage Discharge Formula:
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Definition: This calculator determines the sewage discharge flow rate based on river and mixing concentrations, stream discharge, and sewage concentration.
Purpose: It helps environmental engineers and water resource professionals calculate the sewage flow rate when mixed with river water.
The calculator uses the formula:
Where:
Explanation: The formula calculates the sewage flow rate based on mass balance principles, considering the concentrations before and after mixing.
Details: Accurate sewage flow rate calculation is essential for designing wastewater treatment systems, assessing environmental impact, and ensuring regulatory compliance.
Tips: Enter all concentration values (must be ≥ 0), stream discharge (must be > 0), and ensure mixing concentration is different from sewage concentration.
Q1: What units should I use for concentrations?
A: Use consistent units (e.g., mg/L for BOD, DO, or other parameters) for all concentration values.
Q2: What if I get a negative result?
A: A negative result indicates the calculation is not physically meaningful - check your input values.
Q3: What's a typical range for stream discharge?
A: Stream discharge varies widely from <1 m³/s for small streams to >1000 m³/s for large rivers.
Q4: How accurate is this calculation?
A: Accuracy depends on precise measurement of concentrations and stream discharge.
Q5: Can I use this for other pollutants?
A: Yes, the formula works for any conservative parameter (one that doesn't degrade quickly).