Hydrozoning organises the garden by real water needs. The zones are defined by aspect, soil, layer, use and establishment phase, and not just by proximity.
Hydrozoning organises the garden by real water needs. The zones are defined by aspect, soil, layer, use and establishment phase, and not just by proximity. The strategy reduces waste and makes it possible to keep higher-demand areas where they deliver a benefit, without watering the whole property in the same way.
Map the factors before the irrigation zones
Sun, wind, slope and soil type change evaporation and retention. Newly planted trees, lawn, Mediterranean massed planting and shaded areas have different rhythms.
The map should distinguish permanent need from the temporary need of establishment.
Group compatible plants
Placing high- and low-demand plants in the same irrigation zone forces you to water for the most sensitive. A visually coherent palette should also be compatible in its water needs.
In large massed plantings, changes in level can justify sub-zones even with the same species.
Link design, irrigation and monitoring
The irrigation design should follow the hydrozones, with suitable emitters and run times. Sensors help, but they are no substitute for inspecting soil, flow rate and uniformity.
The reduction in irrigation after establishment should be planned for. Without review, temporarily intensive irrigation zones stay that way for years.
A useful key for the project
The map can use four classes: high need and intensive use; moderate need; low need after establishment; and areas with no permanent irrigation. Each class should state the type of emitter, the seasonal frequency and the criterion for reduction.
Newly planted trees should appear as a temporary layer over the hydrozones. That way they receive specific support without forcing the whole irrigation zone to keep up a high regime.
Consumption should be reviewed at the end of each season, comparing irrigation hours, gaps in coverage and signs of stress. This review makes it possible to correct oversized irrigation zones and confirm which areas can already move to a maintenance regime.
Mistakes to avoid
The most common mistakes are designing the irrigation after planting; grouping by appearance alone; using the same run time for sprinklers and drip; and not reviewing the seasonal programming.
Applying it to the project
At Diaplant, hydrozoning links plant selection to the irrigation design. Plants are grouped by real water need and consumption is reviewed after establishment.
To hydrozone is to make water visible in the design. Each zone receives what it needs, for as long as necessary and with a defined purpose.
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