Sewage Flow Rate Calculator

Sewage Discharge Formula:

\[ Q_s = \frac{(C_R - C) \times Q_{stream}}{(C - C_s)} \]

River Concentration (CR):

Mixing Concentration (C):

Discharge in Stream (Qstream):

m³/s

Sewage Concentration (Cs):

Sewage Discharge (Q_s):

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1. What is Sewage Flow Rate Calculator?

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.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_s = \frac{(C_R - C) \times Q_{stream}}{(C - C_s)} \]

Where:

\( Q_s \) — Sewage discharge (m³/s)
\( C_R \) — River concentration
\( C \) — Mixing concentration
\( Q_{stream} \) — Discharge in stream (m³/s)
\( C_s \) — Sewage concentration

Explanation: The formula calculates the sewage flow rate based on mass balance principles, considering the concentrations before and after mixing.

3. Importance of Sewage Flow Rate Calculation

Details: Accurate sewage flow rate calculation is essential for designing wastewater treatment systems, assessing environmental impact, and ensuring regulatory compliance.

4. Using the Calculator

Tips: Enter all concentration values (must be ≥ 0), stream discharge (must be > 0), and ensure mixing concentration is different from sewage concentration.

5. Frequently Asked Questions (FAQ)

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).