How do I build a Super Modified Raft (SMR) system?
The super modified raft used in our videos is a simple retrofit design of a common flood table. First, it is important to identify that this system cycles continuously, so a timer is not necessary. Second, set your drain riser to whatever height you prefer the water to fill to. Our water level is set just below the lip of the table at about 3.75″. Next, you must accurately determine how much aeration is necessary for optimum performance. This is done by first calculating the amount of “working water” in the table. This can be accomplished through a series of simple calculations. • Obtain the inside length value and multiply it by the inside width value. • Take that total and multiply it by the height of the water you set with your drain riser to in the prior step. • Convert these values to inches and multiply by .00433 to arrive at gallons. • Once you have gallons, multiply that value by 25. The value obtained from the last equation is an estimate of the amount of air you would like to
