Watering & irrigation
How to plan drip irrigation for pots and raised beds
Map the plants, separate unlike watering needs, check the tap and flow, then build and test one zone at a time. This planning method works whether you buy a kit or choose parts separately.
Published 29 September 2026 · Researched GardenMate guidance
Start here
Quick answer: plan the zone, not the kit
A reliable small drip system starts on paper. Mark the tap, every pot or raised bed, the route between them and the plants that should be watered together. Then check how much water the tap can supply and compare that with the rated flow of the emitters planned for one zone.
Do not use the tubing length on a kit as a promise of coverage. Corners, vertical rises, feeder runs, spare slack and the available flow all affect the workable layout. Start with one modest zone, test it, and extend only when the furthest outlets are delivering properly.
- Draw the route before counting fittings.
- Keep pots and raised beds separate when their watering needs differ.
- Include filtration and pressure control where the chosen system requires them.
- Test the whole zone before burying, clipping or concealing tubing.
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Map the garden and make sensible watering zones
Sketching does not need to be technical. A rough plan with distances is enough to show where the main supply tube can run, where smaller feeder lines may branch off and where an isolation valve or end cap will remain accessible.
Group plants by the conditions they actually share. A sunny terracotta pot can dry much faster than a large plastic pot in shade. A newly planted raised bed may need different attention from an established herb bed. If two areas routinely need different run times, put them on separate zones rather than trying to correct the mismatch with guesswork.
Sydney Water recommends treating areas with different water needs as separate zones and knowing the water flow available before calculating how many outlets a zone can support. That is a better basis for a layout than dividing the advertised tube length by the number of pots.
- 1
Mark the source
Record the tap location, thread or connector already fitted, and whether the line must cross a path or doorway.
- 2
Measure the route
Measure the mainline path rather than straight-line distance. Allow for corners, rises to pots, service loops and an accessible end for flushing.
- 3
List the outlets
Write down each pot and bed, then note its size, sun exposure and broad watering need.
- 4
Draw the zones
Keep unlike needs apart. Give each zone a clear start and end rather than building one long, hard-to-diagnose circuit.
- 5
Count after planning
Only now count tees, elbows, take-offs, stakes, valves, end fittings and emitters. Keep a few compatible spares for changes and repairs.
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Check the tap, flow and control parts
Use a bucket of known volume and a stopwatch to get a simple tap-flow estimate. Sydney Water’s method is to open the tap fully, time the fill, and convert the result to litres per minute. Repeat the test if the household supply varies at different times, and do it at the outlet you will actually use.
Add up the manufacturers’ rated emitter flows for the proposed zone and leave room for real-world losses and future changes. If the total is close to the measured supply, reduce the zone rather than assuming every outlet will behave the same at the end of a long line. An irrigation specialist can check a design where elevation, long runs or marginal pressure make the result uncertain.
Drip equipment usually operates differently from a bare garden hose. Riverina Water advises placing a pressure regulator after the filter for drip irrigation. A timer controls when water runs, but it does not replace filtration, pressure regulation or any backflow protection the installation requires. Check the order and pressure rating in the instructions for the actual components you buy.
- Tap adaptor that matches the actual outlet
- Backflow protection appropriate to the connection
- Timer or controller, if automatic watering is wanted
- Filter sized for the system and water source
- Pressure regulator suited to the selected drip equipment
- Mainline, feeder tube, emitters, valves and flushable ends from compatible systems
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Choose outlets for pots and raised beds
For pots, plan the outlet around the root area rather than the rim. One point outlet may suit a small pot; a large container may wet more evenly with multiple outlets or a small drip ring. Use the emitter maker’s flow rating and installation limits instead of assuming all adjustable drippers produce the same amount.
For a raised bed, the aim is even coverage through the planted root zone. Parallel dripline runs can be easier to inspect than a maze of small feeder tubes, but line spacing and run time depend on the dripline, soil, bed width, plants and local conditions. Follow the selected product’s design information, then check the soil between lines during commissioning.
Keep outlets visible until the system has been tested. Mulch can go back afterwards, without burying fittings so deeply that a leak or blockage becomes difficult to find.
Illustrative plan
Worked example: turn a mixed garden into two zones
Imagine a courtyard with six sunny pots along one wall and a shaded raised bed around the corner. The mainline route measures 28 m when it follows the walls and rises to the pots, even though the straight-line distance is only 18 m. A 30 m tubing claim would therefore leave little allowance for feeder runs, accessible ends, service loops or a changed route; it would not prove that the kit can water the whole area.
On the sketch, put the sunny pots in one zone and the shaded bed in another because they are likely to need different run times. For the pot zone, if the six outlets you select are each rated by their manufacturer at 2 L/h, their stated total is 12 L/h. Calculate the raised-bed zone separately using the ratings and layout limits for its actual dripline or emitters, then compare each zone with the tap-flow test and the selected system’s instructions.
Those figures are an example of the planning method, not a product recommendation or watering schedule. After installation, flush and run one complete zone at a time, check the furthest outlets, and adjust from observed moisture at root depth rather than copying the example’s numbers.
- 1
Measure the real route
Follow the path the tube must take and allow for branches, rises, accessible ends and changes.
- 2
Separate unlike areas
Draw the sunny pots and shaded bed as two zones instead of trying to correct different needs with one run time.
- 3
Total the selected outlets
Use the manufacturers’ ratings for the actual emitters in each zone; six outlets rated at 2 L/h give an illustrative stated total of 12 L/h.
- 4
Commission the result
Treat the calculation as a starting check, then test the complete zone and inspect moisture before setting a schedule.
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A practical setup sequence
Lay the system out in daylight when every joint is easy to see. Make changes while the tube is still loose and accessible.
- 1
Assemble the headworks
Fit only the tap adaptor, control, filter, regulator and backflow components required for your design, following their instructions and local requirements.
- 2
Lay the mainline
Follow the planned route without tight kinks. Secure it lightly at first so tees and corners can still move.
- 3
Flush before fitting outlets
Open the line ends and run clean water through the tubing. Close each end only after debris has cleared.
- 4
Add branches and emitters
Work from the plan, keep connections square and avoid enlarging punched holes by repeatedly removing fittings.
- 5
Run a full-zone test
Watch every connection and every outlet, including the furthest one. Repair leaks and uneven delivery before securing or covering tube.
- 6
Tune with the soil, not the clock alone
Run the zone, wait for water to move through the mix or soil, then check moisture at root depth. Adjust duration and frequency as plants, weather and seasons change.
Commissioning and troubleshooting
Automatic irrigation is not set-and-forget. Sydney Water warns that a poorly designed, programmed or maintained automatic system can use more water than the garden needs. Check it while running, particularly after hot weather, maintenance or a controller reset.
Troubleshoot from the source towards the end of the zone. Changing several components at once makes the fault harder to find.
- No water anywhere: confirm the tap, timer, isolating valve and filter are open and correctly assembled.
- Strong flow near the tap, weak flow at the end: check for a kink, blockage, excessive zone demand or a run outside the product’s limits.
- One pot stays dry: inspect that take-off and emitter before increasing the whole zone’s run time.
- Water runs from a raised bed: shorten the application or split it into cycles, then reassess after the water has soaked in.
- Connections pop off or emitters leak: stop and confirm tube compatibility and regulated pressure before replacing parts.
- Plants stay wet after cool or rainy weather: pause or reduce watering and check moisture before the next cycle.
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Check locally
Australian watering rules and backflow
Watering rules differ by location and can change. For example, Sydney Water currently publishes Water Wise Guidelines, while Water Corporation publishes rostered watering days for Western Australia. Check your own water provider before programming a timer; do not copy another city’s permitted days or hours.
Backflow requirements depend on the connection and hazard. The National Construction Code requires relevant cross-connections and alternative water supplies to be assessed and protected with an appropriate backflow prevention device. A fertiliser-injection system, rainwater connection, recycled-water supply or other permanent plumbing changes the risk and is not a simple extension of a removable tap kit.
If the design connects different water sources, injects fertiliser, becomes permanent plumbing or leaves you unsure about protection at the tap, stop and ask your water provider and a licensed plumber what applies in your state or territory. Do not improvise a cross-connection.
Where a ready-made kit can fit
A kit can be a convenient parts bundle once the plan is known. It should not determine the plan. Compare its tube sizes, connector standard, emitter ratings, filter and pressure requirements with the map and tap you have already checked.
GardenMate’s current Tivddikun product page can be used as one example of a 50 m kit listing. GardenMate has not independently established a workable layout, pot capacity or compatibility for that package, so verify those details with the seller and the component instructions before relying on it.