I assume by catch basin you mean sump pump pit. You probably have perimeter drains around the interior of your basement/crawl space foundation that drain into it. This is fine. Its also possible that you have exterior perimeter drains around the foundation that drain into it. This is generally a bad design as you don't want to bring storm water into the house but its been done before. If your sure gutters were tied into this than there is a reasonable possibility that the exterior perimeter drains are also draining into this. Not ideal but at this stage the easiest thing to do is install a pump and live with it. Redoing perimeter foundation drains is A LOT of work (I've done it - not fun), expensive, messy and not worth even considering unless you have serious basement water issues.