2.1 Demanddesign Water Supply System

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Aquaculture Engineering (2+1) Participants. Expected Learning Outcome. Water supply systems - canals. Water control structures or Gates. Computation of discharge through sluices. Water supply systems - Types of canals. Canals - Formula. Gastrointestinal illness have been attributed to a centralized community water supply system in a large city of a developed country (Laval, Quebec, Canada) where water was extensively treated by modern methods and met all microbial quality requirements (Payment et al, 1991; 1996). These findings suggest that pathogens at. 2 days ago  - For the following building plan shown below design the water supply system for the ground floor knowing that the building contains 2 flores (ground and first and they are similar and the system is private flusta valve the height of each floce 3.65m and the distance from the vertical pipe and the collector is 49m and the longest distance between the collector and fixture is 9.15. Public Water Supply Point (Water Supply by Small Tube wells) In the southern area of Mandalay City, there are altogether 54 public water supply points beyond the present water service area. Each system is composed by a small tube well having a four inches (100 mm) diameter of a depth ranging from 20 m to 40 m, a set of. OCTOBER 2014 VA. Department of Veterans Affairs. Ofce of Construction & Facilities Management. Rev May 1, 2018.

  1. Supply & Demand Pdf
  2. Demand Supply And Price
  3. Example Of Supply And Demand
  4. Supply And Demand 1

WSFU is used to calculate water supply service systems

The WSFU (Water Supply Fixture Units) is defined by the Uniform Plumbing Code (UPC) and can be used to determine water supply to fixtures and their service systems.

Individual FixturesMinimum Fixture Branch Pipe SizeWater Supply Fixture Units
WSFU
(inch)Private InstallationsPublic Installations
Bathtub1/244
Bathtub with 3/4' fill valve3/41010
Bidet1/21
Combination sink and tray1/2
Dishwasher, domestic1/21.51.5
Drinking fountain1/20.50.5
Hose bibbs1/22.52.5
Laundry, 1 - 3 compartments1/2
Lavatory1/211
Bar sink1/212
Clinic fauce sink1/23
Kitchen sink, domestic1/21.51.5
Laundry sink1/21.51.5
Service or mop basin1/21.53
Sinks, flushing rim3/4
Sinks, service1/2
Washup basin1/22
Shower, single head1/222
Urinal, flush tank1/222
Urinal, flushometer valve3/4
Wall hydrant1/2
Wash fountain3/44
Water closet, gravity flush tank1/22.52.5
Water closet, flushometer valve12.52.5
Water cooler1/20.50.5
  • 1 WSFU = 1 GPM = 3.79 liter/min
  • 1 in = 25.4 mm

Note that this conversion is only true for one or a few fixtures. Since all fixtures in a system are never used at the same time, the total units achieved by adding the numbers for all fixtures must be compensated for their intermittent use.

For supply pipe lines this is taken care of in the sizing tables.

For manifolds or special equipments sizing, a formula or a table can be used.

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2.1
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  • Sizing Water Supply Lines - Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU)
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  • Water Supply - Calculating Demand - Calculating expected demand of water supply in service lines
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Calculating expected demand of water supply in service lines

The total theoretical demand for a water supply system can easily be calculated by adding known maximum demand for all fixtures in the system. Due to the nature of intermittent use this will unfortunate add up to unrealistic demands for the main supply service lines. A realistic demand for a supply system will always be far less than the total theoretical demand.

Expected demand in a water supply system can be estimated as

qet = qnl + 0.015 ( Σqn - qnl ) + 0.17 ( Σqn - qnl )1/2 (1)

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where

qet = expected total water flow (l/s)

qnl = demand of largest consumer (l/s)

Demand

Σqn = total theoretical water flow - all fixtures summarized (l/s)

Note that minimum expected total water flow can never be less than the demand from the largest fixture. This equation is valid for ordinary systems with consumption patterns like

  • homes
  • offices
  • nursing homes
  • etc.

Be aware when using the equation for systems serving large groups of people where the use is intermittent, like in

  • hotels
  • hospitals
  • schools
  • theaters
  • wardrobes in factories
  • etc

For these kind of applications, like a wardrobe, it is likely that all showers are used at the same time. Using the formula blindly would result in insufficient supply lines.

Example - Main Water Supply to a Nursing Home

If the theoretical demand from all fixtures in a nursing home adds up to 50 l/s and the larges fixture requires 0.4 l/s, the expected water supply demand can be estimated like

Supply & Demand Pdf

qet = (0.4 l/s) + 0.015 ((50 l/s) - (0.4 l/s)) + 0.17 ((50 l/s) - (0.4 l/s))1/2

= 2.3 (l/s)

Total Theoretical Water Flow and Expected Flow

Expected demand for a supply system at different total theoretical demand can based on the formula above be expressed as

Total Theoretical Demand Summarized
(liter/s)
Expected Demand
(liter/s)
0.20.2
0.80.4
1.60.5
4.00.6
8.00.85
151.1
201.5
301.8
402.1
652.8
702.9
1003.7

The maximum fixture load is 0.2 liter/s.

Demand Supply And Price

Related Topics

  • Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more

Related Documents

  • Cross-Contamination Control - It is fundamental to keep the potable water in the water supply systems uncontaminated
  • Domestic Hot Water Service Systems - Design Procedure - Design procedure for domestic hot water service systems
  • Fixture Units - WSFU vs GPM and Liters/sec - Converting WSFU - Water Supply Fixture Units - to GPM
  • Fixture Water Requirements - Water outlets demand
  • Online Design of Water Supply Systems - Online design tool for a water supply system
  • PE Water Supply Pipes - Properties - Nominal pipe size, outside diameter, wall thickness, weight and working pressure
  • Sizing Water Supply Lines - Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU)
  • Water - Human Activity and Consumption - Activity and average water consumption
  • Water Distribution Pipes - Materials used in water distribution pipes
  • Water Service Pipe Lines - Water service pipe lines extends from the potable water source to the interior of buildings
  • Water Supply - Fixture Units WSFU - WSFU is used to calculate water supply service systems
  • Water Supply Pipe Lines - Sizing - Sizing of water supply pipe lines
  • Water Supply to Public Buildings - Required water supply to public buildings

Example Of Supply And Demand

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Supply And Demand 1

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