There are gutters zip tied on the end of the metal that dump into oil drain pans that drain into floor drains. I have a remodel planned to narrow the tables to 3’ and bend the trellis supports for a 5’ canopy just to make it easier to get around. Right now the tables are 5’. Then raise the tables up on aluminum jack stands so they can dump into buckets that drain to floor drains so there is a bigger margin for clogs and to make it easier to mop under. Right now they sit on plastic pallets. Then a change to leds so i can have 3 flower rooms for next winter. Watch and see