Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Water Supply due to Fixtures Water Requirements

Each fixture in a water supply system represents a certain demand of water. Supply requirement for common fixtures:

Water Supply Flow and Pressure due to Fixtures Water Requirements
FixtureFlow rateMinimum Supply Pressure
(gpm)(l/min)(psi)(kPa)
Aspirator 2.5 10 8 55
Bathtub faucet 5 19 8 55
Bidet 2 7.5 4 28
Combination fixture 4 15 8 55
Dish washing machine 4 15 8 55
Drinking fountain jet 0.75 3 8 55
Hose bib or sillcock, 1/2" 5 19 8 55
Laundry faucet 1/2" 5 19 8 55
Laundry machine 4 15 8 55
Lavatory faucet, ordinary 2 7.5 8 55
Lavatory faucet, self closing 2.5 10 8 55
Shower head 5 19 8 55
Shower, temperature controlled 3 10 20 138
Sink faucet 3/8", 1/2" 4.5 17 8 55
Sink faucet 3/4" 6 23 8 55
Urinal flush valve 15 56 15 110
Water closet with flush valve 35 132 25 170
Water closet with gravity tank 2.5 10 8 55
Water closet with close coupled tank, ballcock 3 11 8 55

Adding up the numbers to cover all fixtures in a system would give the total demand if all fixtures were used at the same time. This is  almost never realistic for a supply system. Reasonable estimates must be made based on simultaneously demand from the fixtures.

### Example - Required Water Supply

For a water supply system the summarized theoretical water flow for all fixtures is 10 l/s. The largest fixture in the system requires 0.4 l/s.

Based on the diagram above the expected total water flow in the system will be aprox. 1.1 l/s.

## Related Topics

### • Water Systems

Design of hot and cold water service and utility systems with properties, capacities, sizing of pipe lines and more.

## Related Documents

### Cold Water Dwellings - Storage Capacities

Required cold water dwelling storage capacity - commonly used fixtures and types of buildings.

### Cold Water Storage per Occupant

Cold water storage for occupants in common types of buildings as factories, hospitals, houses and more

### Farm Livestocks - Water Consumption

Farming and animals required water supply.

### Fixtures - Hot Water Content

Content of hot water in some common used fixtures - basins, sinks and baths.

### Hot Water Circulation System - Return Pipes

Hot water can be circulated through a return pipe if it's instantly required at the fixtures.

### Hot Water Supply vs. Fixtures Consumption

Design hot water consumption of fixtures - basins, showers, sinks and baths.

### Plumbing Codes

Plumbing or sanitation codes are a set of rules and regulations imposed by cities, counties or states.

### Sanitary Piping - Drainage Fixtures Unit Loads

Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.

### Water - Human Activity and Consumption

Activity and average water consumption

### Water Supplies - Expected vs. Theoretical Summarized Demand

Calculating expected demand for water supply service lines.

### Water Supply Fixture Units - WSFU vs. GPM and Liters/sec

Converting WSFU - Water Supply Fixture Units - to GPM.

### Water Supply Public Buildings

Required water supply to public buildings.

### Water Supply Systems - Online Design Application

Free online tool for designing water supply systems in buildings.

### Yard Fixtures - Water Consumption

Water consumption in garden fixtures.

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!