Irrigation systems: delivering the right water to the right plants, and proving it.

Hydrozoning groups plants with similar water requirements onto the same irrigation zone, so each zone can be run for the time its plants need. Mixing lawn and drought-tolerant shrubs on one zone guarantees that one group is overwatered and the other is not, the most common and most wasteful design error in landscape irrigation.

For shrub beds, hedges and trees, drip delivers water at the root zone with much less evaporative loss and is generally preferable. Lawn needs overhead coverage, so sprinklers or rotors are appropriate there. Most landscapes need both, on separate zones, rather than one system throughout.

Frequently yes, and it is often the intended reuse route on campuses and industrial sites. The treated water must be checked for suitability (particularly salinity, sodium and residual solids) and monitored over time, and the system needs adequate filtration, since suspended solids block emitters quickly.

It depends on season, soil, species and establishment stage rather than on a fixed schedule. Deeper and less frequent watering encourages deeper rooting than daily light watering. Controllers should be reset seasonally, and monsoon shut-off is one of the simplest and most neglected water savings available.

Suspended solids, algal growth and mineral or biological deposits in the emitters, almost always where filtration is inadequate or unmaintained. A drip system needs filtration sized correctly, cleaned on schedule, plus periodic flushing of laterals. Blockage is a maintenance failure much more often than a product failure.

Automation makes seasonal scheduling and zone control practical and prevents the most common manual failures, and it pays for itself on any reasonably sized landscape. It does not remove the need for inspection: a controller will faithfully run a broken zone, so periodic physical checks stay part of the regime.