Note that inlets On Grade must specify the gutter’s longitudinal slope. The inlet is the place water is launched into the tank, while the outlet is the place the water exits to other tanks or the purpose of use. Inlets are usually positioned close to the highest of the tank, whereas outlets are positioned at or close to the underside to ensure the tank can be absolutely emptied when w... https://www.4shared.com/office/PcmXWJSxku/6_Sensible_Tips_On_Lighting_Fo.html