will it still seep out if there is only gravity pressure from a water tank? i played with a rain gathering system this past summer and about the end of oct. i opened the drains so it wouldn't collect water. i was afraid of something freezing and bursting. right after i got a couple of trees and wished i had kept the water for a bit longer. i'm considering hooking a soaker hose to the outlet and wrapping the hose around the tree trunks to help keep them watered. i don't know anything about soaker hoses. would the gravity of the water in the tank be enough to made the hose work as it should? thanks.