Landscape Irrigation Network

Landscape irrigation in two steps: water demand of every zone (solenoid valve) from project rates, ShNQ 2.04.01-22 or ETo, run times and a valve program inside the irrigation window; then the main line point by point with the shared network engine - pump flow and head, pressure at every valve, storage tank and take-off.

1 · Water demand and irrigation window

Demand method

ETo, peak month (mm/day)

Effective rain, peak month (mm/day)

Waterings per day (-)

Irrigation window (h)

Window start (h)

Unaccounted / system losses (%)

Storage (day)

Flow limit per group (0 = automatic) (L/s)

2 · Zones (one solenoid valve each)

#	Zone / valve	Plant	Device	Quantity	Rate (L/unit/day)	KL	Canopy Ø (m)	Devices per plant	Device flow (L/h)	Emitter spacing (m)	Row spacing (m)	Precipitation (mm/h)	Pressure at valve (bar)	Stub-out at point	Stub L (m)	Stub Ø

Quantity: number of plants for bubblers and emitters at the plant, area in m² for dripline, spray and rotor. One device type per valve. Rate: daily water per plant or per m² (project rates; for ShNQ the norm per watering × waterings per day). Pressure at valve empty = device pressure × (1 + lateral allowance) + valve loss (+ filter loss for drip).

3 · Main line pipe

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)	Quick coupler
↩	Back to start

Distance = main pipe length from the previous point (the first point: from the supply tee). Valves sit on stub-outs from these points; tick the points with a quick coupler.

Schematic

Numbers follow the point rows. Green squares = valves, orange = quick couplers.

5 · Pump / supply and quick couplers

Supply pipe size

Supply pipe length (m)

Level of the pump / connection (m)

Calculate

Available pressure at the supply (m)

Quick couplers open at the same time (-)

Flow per quick coupler (L/s)

Pressure at the quick coupler (bar)

⚙️ Device pressures, losses and limits

Lateral allowance (%)

Solenoid valve loss (bar)

Drip filter / regulator loss (bar)

Minimum pressure in the main (0 = off) (bar)

Bubbler pressure (bar)

Emitter pressure (bar)

Dripline pressure (bar)

Spray pressure (bar)

Rotor pressure (bar)

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 (-)

Water temperature (°C)

Hazen-Williams C (-)

Pipe roughness (mm)

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Landscape Irrigation Network

1 - Water demand
• Every zone = one solenoid valve, one plant type, one device (do not mix devices on a valve).
• Methods: project rates (L/plant/day, L/m²/day), ShNQ 2.04.01-22 Annex 3 item 26 (lawn 3, green areas and flower beds 3 - 6, sports 1.5 L/m² per watering × waterings per day) or ETo × KL / efficiency.
• Flow: bubblers / emitters per plant, dripline grid, spray or rotor precipitation rate. Run time = daily water / flow.

2 - Valve program
• Valves running together form a group; the groups run one after the other inside the window. Automatic grouping keeps the largest group flow (the pump flow) as small as possible.

3 - Main line
• Points from the pump / supply tee (loop or single line); every valve on a stub-out; quick couplers on points.
• Every group and the quick couplers are solved; the worst gives the pump head. Valve inlet pressure = device pressure × (1 + lateral allowance) + valve loss (+ filter loss for drip).
• Pump flow and head, tank, monthly water, velocities, take-off.

Key Points:

Project rates, ShNQ 2.04.01-22 Annex 3 or ETo / KL
Bubblers, emitters, dripline, spray, rotor
Run times and automatic valve program in the window
Pump flow and head, tank volume, monthly water
Main line loop or single line - shared network engine
Pressure at every valve, quick coupler scenario
Take-off: pipes, tees, valves, solenoid valves, quick couplers
PDF and CSV report

Calculation Steps:

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