Laserfiche WebLink
Figure 4-10. Drop box distribution network <br />Inlet From Outlet to <br />Pretreatment A Trench <br />or Previous Overflow <br />Drop Box —� �— to Next <br />Drop Box <br />Outlet to <br />Trench <br />Plan <br />Inlet Overflow , Inlet <br />O , Outlet to <br />I -r Trench <br />----I <br />Outletsto - - - - - <br />' <br />Trench <br />Profile End View <br />A Distribution <br />Pipes ' <br />Pretreatment <br />Unit Water -Tight <br />Pipes <br />Figure 4-11.Various gravelless systems <br />Box <br />Extra Trenches <br />Can be <br />Added If <br />Necessary <br />Plan <br />Covers Should be Exposed at <br />Surface if Insulated in <br />Cold Climates <br />Drop Boxes <br />Source: USEPA, 1980 <br />Polystyrene Geotextile <br />Wrapped Pipe Wrapped Pipe <br />Source: National Small Flows Clearinghouse, <br />Chamber <br />USEPA Onsite Wastewater Treatment Systems Manual 4-21 <br />