 Since drain suction increases rapidly when a portion of the drain opening is blocked, having two drains or a larger drain inlet allows alternate suction paths for the pump.Swimming pool safety devices are available to automatically turn off an operating pump if a rapid increase in suction is detected (as could happen during a suction entrapment incident).In 1994, Cristin Fitzpatrick drowned in a Variety Village swimming pool when her hair became entangled in a water funnel.