We have been looking at systems that use gravity to move the effluent. This month we complete this part of the discussion by looking at installing soil treatment trenches or beds.Most codes we see define trenches and beds. Most recognize trenches as being no more than 36 inches wide and beds as being anything wider. Codes usually specify a maximum bed width. As always, it is important to know the requirement for your state or area. Typical bed widths are 10 to 12 feet.It is also important to know the requirements for separation from the bottom of the trench or
