Module 02 · drip

DRIP ZONES

Each cultivar already knows how much water it wants. We size the header and the poly mainline so pressure holds at the far end. Keep flow under 5 feet a second and tape above 8 psi. One zone at a time is the usual program; everything at once is the stress test.

Mainline residual pressureFriction in PE pipe

Supply · source

CAPACITYGPMSOURCE PSIat pump / bibMAINLINEMAINLINE Lft source → last zoneREGULATORtape setpoint

Peak zone: 4.2 GPM
All zones: 16.89 GPM
Supply: 10 GPM
Headroom: 5.8 GPM

All zones inside velocity ≤ 5 ft/s and supply. Sequential program OK.

Zones · hydraulic audit

ZONE	BEDS	EMITTERS	DEMAND	UTIL	ΔP	V	STATUS
A LETTUCE	4	600	4.2 GPM	42%	0.8 psi	2.53 fps	OK
B CARROT	1	150	1.05 GPM	11%	0.1 psi	0.63 fps	UPSIZE ½ in
C BRASSICA	3	300	2.3 GPM	23%	0.2 psi	1.38 fps	UPSIZE ½ in
D SOLANUM	2	150	1.25 GPM	13%	0.1 psi	0.75 fps	UPSIZE ½ in
E CUCURBIT	2	100	0.96 GPM	10%	0 psi	0.58 fps	UPSIZE ½ in
F HERB	3	450	2.73 GPM	27%	0.3 psi	1.64 fps	UPSIZE ½ in
G GREENS	3	450	2.3 GPM	23%	0.2 psi	1.38 fps	UPSIZE ½ in
H ALLIUM	2	300	2.1 GPM	21%	0.2 psi	1.26 fps	UPSIZE ½ in

Sized so water stays under 5 ft/s and header loss under 3 psi. Demand comes from the crop's emitters.