Site Water Supply Network

Water supply network of a site or district, point by point to every building: daily and peak demand from the norms, required pressure per building, mains / tank + booster / zoned supply, residual pressure, static pressure check, combined domestic + fire scenario and take-off with tees, valves and water meters.

1 · Standard and demand factors

Standard

Kday,max (-)

αmax (-)

βmax (0 = from Table 3) (-)

Unaccounted water (%)

Tank filling time (0 = at the maximum hour) (h)

Combined domestic + fire network

Simultaneous hydrants (fire) (-)

Flow per hydrant (fire) (L/s)

Minimum pressure at the hydrant (fire) (m)

2 · Buildings

#	Building	Type	Persons / units	Norm (L/unit/day)	Floors	Floor height (m)	Supply	Floors from mains (zoned)	Connected at point	Service L (m)	Service Ø	Elbows	Valves	Meter	Inlet level (m)	Peak flow (L/s, optional)

Norm: residential from ShNQ 2.04.02-19 Table 1 (230 / 200 / 120 L/person/day); other types from ShNQ 2.04.01-22 Annex 3 (average day); mosque and other: typical values. Supply: Automatic = the mains fill the building tank and the report shows how many floors the mains can feed directly; Mains pressure = every floor directly; Tank + booster = only the tank inlet; Zoned = the given number of lower floors from the mains. Inlet level empty = ground level of the connection point. Peak flow: from the building's own plumbing calculation (otherwise the maximum hour is used).

3 · Pipe and line

Pipe material

SDR

Main size (OD mm)

Friction formula

Line type

Start point (supply tee)

Ground level at the supply tee (m)

4 · Points in order from the supply tee

#	Point	Distance from previous (m)	Ground level (m)	Elbow 90°	Elbow 45°	Elbow 22.5°	Valve	Main Ø (if different)	Hydrant	Branch L (m)	Branch Ø	Branch valve	Outlet height (m)
↩	Back to start

Distance = pipe length from the previous point (the first point: from the supply tee). Buildings are connected to these points (a tee on the main and the service line). Mark a point as a hydrant for the combined domestic + fire scenario.

Schematic

Numbers follow the point rows. Blue squares = buildings, red = hydrants.

5 · Supply

Supply pipe size

Supply pipe length (m)

Level of the city connection / pump (m)

Calculate

Available pressure at the supply (m)

⚙️ Pressures, local loss coefficients and limits

Maximum static pressure (m)

Flow pressure at the highest fixture (m)

Internal losses of the building (m)

Minimum service pressure (IPC) (m)

Pressure at the tank float valve (m)

Building tank storage (day)

Maximum velocity (warning) (m/s)

K elbow 90° (-)

K elbow 45° (-)

K elbow 22.5° (-)

K isolation valve (open) (-)

K tee, straight through (-)

K tee, into the branch (-)

K water meter (-)

Water temperature (°C)

Hazen-Williams C (-)

Pipe roughness (mm)

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Site Water Supply Network

Demand
• Buildings: type, persons / units × daily norm. Residential norms from ShNQ 2.04.02-19 Table 1; other building types from ShNQ 2.04.01-22 Annex 3 (average day); mosque and other: typical values.
• Maximum day = average × Kday (1.1 - 1.3); maximum hour = Khour × maximum day / 24, Khour = αmax (1.2 - 1.4) × βmax (Table 3, total persons).

Pressure at the building
• ShNQ / SP: 10 m + 4 m per floor above the first (2.32), at most 60 m static (2.34).
• Supply: automatic, mains pressure, tank + booster or zoned. Automatic: the mains fill the tank, and the report shows how many floors the mains pressure can serve.

Network
• Points from the supply tee (loop or single line); every building is connected to a point by its service line with tee, elbows, valves and water meter.
• Combined domestic + fire network: maximum hour + fire flow at N adjacent hydrants (2.22).
• Required supply pressure, or check of an available pressure; take-off.

Key Points:

ShNQ 2.04.02-19 demand and pressure rules (also SP, EN, TR, IPC)
Building by building: daily, maximum day, maximum hour
Mains / tank + booster / zoned supply, floors served by the mains
Static pressure check - pressure reducing valve
Combined domestic + fire scenario
Loop or single line, point by point - shared network engine
Take-off: pipes, tees, valves, water meters, elbows
PDF and CSV report

Calculation Steps:

Enter all required parameters
Click "Update Calculation"
Review results and analysis