Back in the old days, out on the farm, we would divert water from the creek and bring it in a ditch to the garden. The garden was cultivated with a cultivator that left furrows between the rows. The water was then carefully divided to run a little stream down between each row. It took some tending, but certainly got the job done.
On the lot I live now, no stream available to try that, but our irrigation water comes from a reservoir up the canyon, down a canal and then into a pipeline. The canal is enough above me that the water in the pipe has enough pressure on it to run rain-birds. So here is how I now irrigate: