You can install check valves inline in your scupper drains, or go to check balls where the drains exit. It isn't uncommon to have the deck drains go underwater when in use, so most boats where this may happen have a check ball or check valve installed inline in the drain to reduce water coming back in.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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