It has been many years since we
have had to flood irrigate to get our lucerne established
but dry times call for drastic measures.
We are lucky to have this as an option, albeit a very expensive option this year.
This photo is a good demonstration how our flood irrigation works.
is divided into bays. Each bay is level across its width but has a slight fall
down the length and has check-banks down each side to contain the flow of water
within each bay. We water one bay at a time. The water comes in the top of the
bay via an outlet on a channel and runs down the length, spreading across the
full width. Before the water reaches the bottom of the bay we close the outlet
to stop the flow of water. Ideally the water should just reach the end, but any
that goes out the bottom flows into our on-farm drainage recycle system where
it is then pumped back into the channel for re-use.