A couple generic notes:
-the lower your water is [and of course it's above the level of the skimmer entry way], the faster the water flows into the skimmer. The doors buoyancy, via the water level, is what holds it up. So higher the water, the higher the door and less potential water flow...the opposite holds true.
-the skimmer plumbed closest to the equipment pad is usually the one w the greatest pull.
-depending on how your pool circulatory system was built [# if drains, # of skimmers], there are usually manually driven valves that determine the vol of water which returns to the pump via the suction side [skimmers or main drains - auxiliary drains for other water features are different, but can have some impact] that will determine your pull to the skimmers. if your pull is set more to the drains, your water is real high and your skimmer is the farthest one to the equipment pad, you are likely to see the least amt of water pulled into the skimmer - conversely if all the return water is switched to the skimmers, the water is low, then you are going to see the greatest level of pull and more to the closest skimmer to the equipment pad...there are some variations, but this is pretty much the rule.
Finally, when kids [or adults] jump into a pool right by a skimmer, the huge wave action can sometimes causes a weir door to either dislodge or get stuck. Also, if you have some real heavy rains that washes debris into your pool thus the skimmer doors will be up high, sometimes a small piece of debris can become lodged in the hole where the weir pins are inserted, like a very small piece of mulch. If in an upward position, and the pump comes on, and the water return is mainly set for the skimmers, you can starve the pump via cavitation... always a good idea to check the weir doors.
good luck, tstex
