wpc
You could increase the size of the line to the point before the creek this will give you a lesser pressure drop to that point. If this does not give you satisfory flow then you would increase the line further. 30 GPM is a lot of water for the average residential user, also the water district should be able to help you. Keep in mind 3/4 pipe at 10gpm the pressure drop is appr. 9pound/100ft, where 11/2 pipe at 10gpm the pressure drop is appr. 1/2pound/100ft.
