Innovation and gravity feed irrigation (see also Unpowered Terracotta Irrigation Controller) скачать в хорошем качестве

Innovation and gravity feed irrigation (see also Unpowered Terracotta Irrigation Controller)

This video features a large garden in Adelaide using gravity feed irrigation from a header tank. A single zone can be used because the pressure at the tank outlet remains the same regardless of the number of drippers. For this installation there are about 1000 non pressure compensating drippers and the pressure at every the dripper is about 50 cm. For conventional pressurised irrigation a pump is needed and the single zone would need to be replaced by many zones. For this garden and similar applications, gravity feed irrigation is much less expensive than pressurised irrigation. During the irrigation event, an adjustable control dripper drips water into an evaporator and so the water level in the evaporator rises. When the water level reaches a high level, the irrigation stops automatically. The next irrigation event starts automatically after enough water has evaporated for the water level to fall to a low level. The water usage (litres per week for example) is directly proportional to the prevailing net evaporation rate (evaporation minus rainfall). This is a unique feature of Measured Irrigation.