STP Capacity Calculator
Estimate sewage generation and required Sewage Treatment Plant capacity.
Population-based presets based on CPHEEO guidance for water demand and sewage estimation.
Population / Occupancy Based Design
Select the occupancy type to automatically load a typical water-demand rate.
Enter the number of persons served.
Auto-filled from the selected occupancy type. You may edit it where project-specific norms apply.
Selected basis: Residential / Urban Domestic — 135 L/person/day.
80% is commonly used as a preliminary sewage-return assumption. Use the project water balance where available.
Optional allowance above estimated average sewage generation.
Used to estimate peak hourly hydraulic flow. This does not multiply the daily STP treatment capacity.
Estimated Design Capacity
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KLD
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Estimated Water Demand
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Average Sewage Generation
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Design Capacity
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Average Hourly Flow
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Peak Hourly Flow
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Rounded Capacity
STP Capacity: Sewage Treatment Plant capacity is the volume of wastewater that a treatment facility is designed to receive and treat each day, generally expressed in KLD or MLD.
Reference basis: CPHEEO, Manual on Sewerage and Sewage Treatment
Systems, 2013, Part A — Engineering. Institutional water-demand
presets are intended for preliminary estimation. Final design should
follow the approved project water balance, applicable building /
development requirements, local authority criteria and actual
wastewater characteristics.