Here we go physics calculation....
Can one connect the drip irrigation system, or soaker hose, to a rain water tank?
Water height of 1m gives pressure of 10 kPa, so 1.4 psi (a "normal" tap pressure is 40-60 psi). Drip irrigation supposedly require a minimum pressure of 10psi.

It seems gravity system have too low pressure for the the drip irrigation or soaker hose.
Anyone has experience to share?
Thanks