Effluent Pump Flow Rate Calculator

ANA›Life Services Authority›National Calculator Authority›Effluent Pump Flow Rate Calculator

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Effluent Pump Flow Rate Calculator

Calculate the required effluent pump flow rate based on daily wastewater generation, pump cycles per day, and dose volume per cycle. Useful for sizing effluent pumps in septic systems, drip irrigation fields, and wastewater treatment systems.

Daily Wastewater Flow (gallons/day)

Total volume of wastewater generated per day

Pump Cycles per Day

Number of times the pump activates per day (typically 4–96)

Pump Run Time per Cycle (minutes)

Duration the pump runs during each cycle

Peaking Factor (optional, default = 1.5)

Safety multiplier to account for peak demand periods (1.0–3.0)

Calculate

Results will appear here.

function effCalc() { const resultDiv = document.getElementById('eff-result');

const dailyFlow = parseFloat(document.getElementById('eff-daily-flow').value); const cycles = parseFloat(document.getElementById('eff-cycles').value); const runtime = parseFloat(document.getElementById('eff-runtime').value); const peakingRaw = document.getElementById('eff-peaking').value.trim(); const peaking = peakingRaw === '' ? 1.5 : parseFloat(peakingRaw);

// --- Input Validation --- const errors = []; if (isNaN(dailyFlow) || dailyFlow 3.0) errors.push('Peaking Factor must be between 1.0 and 3.0.');

if (errors.length > 0) { resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

// --- Core Calculations ---

// Dose volume per cycle (gallons/cycle) // Q_dose = Q_daily / N_cycles const doseVolume = dailyFlow / cycles;

// Required pump flow rate (gallons/minute) // Q_pump = Q_dose / t_run const pumpFlowRate = doseVolume / runtime;

// Design flow rate with peaking factor (gallons/minute) // Q_design = Q_pump × PF const designFlowRate = pumpFlowRate * peaking;

// Convert to gallons/hour and gallons/day for reference const pumpFlowGPH = pumpFlowRate * 60; const designFlowGPH = designFlowRate * 60;

// Total pump run time per day (minutes/day) const totalRunTime = cycles * runtime;

// Pump duty cycle (%) const dutyCycle = (totalRunTime / (24 * 60)) * 100;

// --- Output --- resultDiv.innerHTML = ` ### Results

ParameterValue Dose Volume per Cycle${doseVolume.toFixed(2)} gal/cycle Required Pump Flow Rate${pumpFlowRate.toFixed(2)} GPM Required Pump Flow Rate${pumpFlowGPH.toFixed(1)} GPH Design Flow Rate (with Peaking Factor ${peaking.toFixed(1)}×) ${designFlowRate.toFixed(2)} GPM Design Flow Rate (with Peaking Factor) ${designFlowGPH.toFixed(1)} GPH Total Pump Run Time per Day${totalRunTime.toFixed(1)} min/day Pump Duty Cycle${dutyCycle.toFixed(1)}%

Recommendation: Select a pump rated for at least ${designFlowRate.toFixed(2)} GPM (${designFlowGPH.toFixed(1)} GPH) at the required total dynamic head (TDH) for your system.

`; }

#### Formulas Used

1. Dose Volume per Cycle:

Qdose = Qdaily ÷ Ncycles

Where Qdaily = daily wastewater flow (gal/day), Ncycles = pump cycles per day

2. Required Pump Flow Rate:

Qpump = Qdose ÷ trun

Where trun = pump run time per cycle (minutes) → result in GPM

3. Design Flow Rate (with Peaking Factor):

Qdesign = Qpump × PF

Where PF = peaking factor (dimensionless safety multiplier)

4. Pump Duty Cycle:

Duty Cycle (%) = (Ncycles × trun) ÷ 1440 × 100

Where 1440 = total minutes in a day

#### Assumptions & References

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References

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