Help! I installed a system and thought I would have enough pressure, now that I have it buried, things aren't working so great. Details: well supply - 27 gpm (supply for sprinklers T's off from 1" mainline, then continues on to building & pressure tank/switch reg. 40-60psi). Irrigation - 1" (less than 10') to filter/MV (1"), then to 2" mainline supply. 2" line is overall aprox. 500' lg. with 1" risers coming off at various locations to supply zones. Zone supply - fed from 1" (off 2" mainline) thru mainfold (not sure of the brand name, but they screw together - O Ring seals, etc. Dura?) feeding 1" valves. Laterals - Utilzed 1 1/2" lateral lines (some runs as long as 250' total, most at 125') using "blazing saddle" connectors to funny pipe, to K Rain Super Pro rotors. What I have done - measured output several times during construction with my "flow meter" (which consists of several heads and pressure gauge mounted on a manifold) thus I was able to connect to the 1" risers, turn on water supply, activate as many heads as needed to keep pump running at aprox. 50-55psi (inside building pressure switch). I ended up having aprox. 27 psi of pressure and running 25 gpm. This was measured without zone valves in place. So, I put 5 heads to a zone, and now with everything installed, my pressure has dropped (I need to measure it). Consequently, things look poor, even the runs that are closest to the supply (less than 50' of mainline, 125' of laterals). What should I be looking for?, besides execuses? Thanks a bunch guys/gals!