4x8 bed irrigation?
I'm still working on getting my vegetable beds put together. Going through a serious drought down here in the southeast I've decided to go ahead with a small irrigation system while I'm in the building process.
My beds will be 4'x8'x8" with some fairly good soil beneath it. I've been considering the 100' soaker system from Lee Valley, but...
I was thinking about running a header pipe at the end of each bed and then two 1/4" soaker hoses the length of the beds with each soaker hose one foot in from the sides of the bed. This would place a soaker hose between the two rows on each half of the bed. The LV soaker kit states the soaker hose emits 20 gph per 100'. With my rudimenatary math I'm figuring that's .2gph per foot. With 16 feet of total soaker hose I should only get 3.2gph flow. Needing to put an inch of water on each 4x8 bed will require right at 20 gallons of water....2" which might be better for raised beds would require 40 gallons.
After looking at this (if my math isn't in error and I'm correct in figuring on 1-2" of water needed) it doesn't seem the soaker hose would do the job. With the specs of 20gph per hundred feet I would need 50 feet of hose and need to irrigate for two hours to get 1" of water on each bed. Am I correct in this?
If this is correct and I'm right in thinking I need 1-2" of water on each bed (I'd rather water deep), then 50' of hose in a 4x8 bed seems too congested for me and I might need to look at a drip system rather than a soaker system.
My calculations is with watering for two hours, I guess I could run three lines down the bed and irrigate in two 2-hour cycles to get close to the 20 gallon goal. The soaker hoses do seem less problematical for a newbie.
Any feedback is appreciated by this newbie!
South Central (HOTTTT AND DRYYYY) Alabama