Emitter count, flow rate and water used per run.
Emitter count comes from row length and spacing, and flow times run minutes gives water used. Drip puts water exactly at the root zone, so matching rate to minutes is how over- and under-watering are avoided.
Drip Irrigation
Emitters = row length x 12 / spacing; flow = emitters x flow each
Emitters = row length x 12 / spacing; flow = emitters x flow each Emitter count comes from row length and spacing, and flow times run minutes gives water used.
Drip puts water exactly at the root zone, so matching rate to minutes is how over- and under-watering are avoided.
This calculator takes 5 inputs: Beds / rows, Row length, Emitter spacing, Emitter flow, Run time. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.