Drip Irrigation Design Guidelines
As always, anyone trying to work with gravity fed systems that sit in the range between ~2 metres head (the usual maximum of  very low-head valves) and standard &#x2F; city pressure, are somewhat stuffed.<p>I&#x27;m working with about 10 metres of head - a decent standing pressure, despite coming through 400 metres of 50mm polypipe - but it&#x27;s too much for the specialised &#x27;water barrel&#x27; type valves mentioned here.  Combined with no power (if i had power I&#x27;d have a pump :)  means it&#x27;s also not feasible to use always-closed solenoids, or have sufficient pressure to reliably get residential grade water computer valves to open &#x2F; close.