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On Tuesday, April 30, 2019 at 8:29:40 AM UTC+1, Thomas Prufer wrote:
On Mon, 29 Apr 2019 14:57:38 -0700 (PDT), wrote:

I've been looking at various options for setting up an irrigation system
for the veg plot to connect to my water stopvalve.

I have found "Tropf-Blumat" works. Treznal, but available in the UK.

A clay cone on a water-filled widget opens and closes a thin silicone
rubber
tubing, in response to the actual moisture of the soil around the clay
cone. Get
the water to the plant bed any which way, and then run silicone tubing
through
the device, and lead open droppers off it with tees. one dropper needs to
be
near the device, so it shuts off when the soil is moist enough. The
silicone
tubing is strictly necessary only in the device, so it can shut off the
water,
but it's cheap enough (pound a meter, about) and lasts well.

I like because it works with the water pressure from a head of a few feet
of
water, and waters only when dry. No power supply needed. Needs adjusting,
tuning, thought in setting up, though; also paying-for.

I fiddledwith all those things years ago. The attrition rate on the
drip feed items could be very high. Eventually I went with a rotating
sprinkler on a home made tripod moving it about as necedssary.

I used one of these.
https://www.bunnings.com.au/pope-par...nkler_p3122370

Not ideal for tomatoes, they do better with the water applied
to the dirt, not to the foliage.