My sprinkler system has low pressure and the spray barely reaches, what is wrong?

Low pressure at the sprinklers usually comes from one of a few things, so check them in order. First the pump: a worn pump, a partly closed valve, or an air leak on the suction side lowers the pressure that reaches the field. Next the filter and the pipe: a clogged filter or a blocked or undersized main line drops pressure before it even gets to the laterals. Then look at how many sprinklers you are running at once, because running too many for your pump capacity spreads the pressure thin and every nozzle gets weak. Leaks, cracked pipes, or loose joints also bleed off pressure. Finally, check the nozzles themselves for wear or partial blockage. Clean the filter, fix leaks, and try running fewer sprinklers per shift to see if the throw improves. If the pump itself is weak, get it checked. For matching pump capacity to the number of sprinklers and the right operating pressure, your drip and sprinkler dealer or the irrigation department can size it correctly for your field.