Drip emitter for periodic, volumetrically timed, irrigation

Drip emitter for periodic, volumetrically-timed, irrigation and drip irrigation laterals comprising such emitters, wherein the drip emitter implement a water-accumulation chamber as a hydro-mechanical timer and comprises in addition, a first no-drain valve positioned on the downstream side of the irrigation water inlet to the drip emitter, a second valve located on the downstream side of the irrigation water flow path in the drip emitter, and a water drain that connects to the flow of irrigation water from one side of an elastic member in the emitter's water-accumulation chamber to the second valve, in a manner that helps to close it.