Watering technique — from sensor to sprinkler

Without water no grass—but too much water gives a soft pitch, fungal diseases, and wasted resources. The education regulation requires that you can adjust and maintain irrigation systems and in cooperation with others design and implement irrigation systems that optimize water consumption using IT-controlled systems. Irrigation in other words is not a garden hose and a guess—it is technology, measurement, and planning.

§The watering account: precipitation minus evaporation

The basic concept is evapotranspiration (ET): the sum of the water that evaporates from the soil surface and what the plants themselves release through the leaves. On a hot, windy summer day, ET is high; on a cool, humid day it is low. A watering account balances the course's water balance — precipitation plus irrigation on one side, ET on the other — so you can calculate how much is actually missing. The school subject Irrigation Technique requires exactly that you can measure, record and calculate water consumption and irrigation requirements for areas and keep an irrigation account.

§Measure — do not guess

Modern greenkeepers measure soil moisture directly. Handheld soil moisture sensors (typically TDR meters) show the volumetric water content in the rooting layer in seconds so you can compare greens and spot dry patches before they become visible. Fixed sensors in the course can send data directly to the control system and a local weather station provides rainfall, temperature and wind to the ET calculation. The combination makes it possible to water based on need rather than calendar.

• 01Water early in the morning — less wind and evaporation, and the leaves have time to dry, which reduces the risk of fungal disease.
• 02Water deeply and infrequently rather than a little every day — this drives the roots downward and makes the grass more drought tolerant.
• 03Hand water local dry spots instead of watering the entire green.
• 04Follow up with measurement: a watering plan is only as good as the numbers it is based on.

§The facility: from pump station to nozzle

A watering system typically consists of a pump station a network of main lines solenoid valves that open sections and pop-up sprinklers at greens tees and fairways. Control happens in software where each section has its own programme and where sensor and weather data can automatically adjust or cancel watering. Your job is to keep the whole chain healthy: a single misaligned or clogged nozzle can give a dry stripe across a green long before anyone notices a control error.

§Sustainability: collection and reuse

Water is becoming a more expensive and more regulated resource, and the competence goals require knowledge of water collection, drainage and reuse. Many courses work with basins and lakes that collect drainage and surface water for reuse in watering, so the need for groundwater or mains water decreases. Combined with sensor-controlled watering it is both good economics and a strong green argument — something you as a professional should also be able to communicate to the club's members and management.

“Water is not a habit — it is an account that must add up.”

— Watering principle