Waste water drainfield

An improved waste water drainfield for a sewerage disposal system of the type comprising a plurality of conventional absorption trenches, the improvement comprising a distribution system which comprises:

• at least one distribution pipe at each of the absorption trenches for temporarily storing a quantity of waste water and for distributing the waste water to its respective absorption trench;
• a distribution device , at each of the absorption trenches except one, for separating waste water into first and second flow components of preselected proportions;
• and
• a plurality of distribution lines, the lines connecting the distribution devices in series, and connecting the last distribution device in the series to the distribution pipe for the absorption trench without a distribution device, each of the distribution devices delivering the first flow components to the distribution pipes for its respective trench for temporary storage and distribution, and each of the distribution devices delivering the second flow component via the distribution lines to the next distribution device in the series, the last distribution device in the series delivering the second component to the distribution pipe for the absorption trench without a distribution device.

An improved waste water drainfield for a sewerage disposal system of the type comprising a plurality of conventional absorption trenches, the improvement comprising a distribution system which comprises:

• at least one distribution pipe at each of the absorption trenches for temporarily storing a quantity of waste water and for distributing the waste water to its respective absorption trench;
• a distribution device, at each of the absorption trenches except one, for separating waste water into first and second flow components of preselected proportions each separation device comprising a channel for waste water flow, a flow splitter having an opening facing upstream in the channel for diverting a portion of the flow, proportional to the relative cross sectional areas of the channel and the splitter opening, through the bottom of the channel, and a chamber below the channel for delivering the flow diverted by he splitter to at least one distribution pipe;
• and
• a plurality of distribution lines, the lines connecting the distribution device in series, and connecting the last distribution device in the series to the distribution pipe for the absorption trench without a distribution device, each of the distribution devices delivering the first flow components to the distribution pipes for its respective trench for temporary storage and distribution, and each of the distribution devices delivering the second flow component via the distribution lines to the next distribution device in the series, the last distribution device in the series delivering the second component to the distribution pipe for the absorption trench without a distribution device;
• the chamber of at least one of the separation devices having at least two openings of different sizes to deliver different amounts of waste water to at least two distribution pipes.

A distribution device for use in a waste water drainfield to separate waste water delivered to the distribution device into first and second components of predetermined proportions, the device comprising:

• a chamber;
• at least one outlet from the chamber for the first flow component;
• an inlet for receiving the waste water;
• and outlet for the second flow component
• a channel extending from the inlet to the outlet for the second flow component, the channel being positioned vertically above the chamber;
• an opening in the bottom of the channel;
• a deflector in the channel for diverting a first component of the waste water flow in the channel down through the opening in the bottom of the channel into the chamber where it can pass through the at least one outlet for the first component, while allowing a second component to continue to flow through the channel and out the outlet for the second component.