Since you are using a 4" spacing it is a mute point. The 4" only comes in one flow rate, 1gpm per 100'. This is actually a very high flow rate for drip tape. Based on your information your system will require 50gpm. That is more than most municipal water systems provide, unless a commercial hook-up is provided.
This can be overcome by running your system in "zones" Find out exactly how much water is available through your municipal system and then divide your system into however many "zones" are needed.
Another option is to use a drip tape that uses less water. That would also mean a wider spacing. 8" has a .34gpm per 100'. 12" has a .22 & .45gpm per 100'.
Hope this helps.
: Greetings, I have been instructed to use
: hi-flow drip for a gravity fed irrigation
: system I am setting up; I use 50-100' runs
: of T-tape with emitters every 4". I am
: still experimenting.
: I also plan to hook municipal water up to
: the same system as my back up when droughts
: happen. Will using hi-flow drip with a
: municipal system be detrimen tal to the
: system? Any problems I should anticipate?
: Thank-you very, very, very much for you
: help. I will be sourcing more of my
: materials from you all in the near future as
: I am i n Kentucky and did not know about you
: all until recently. Very best, Paul