401: Excess Graywater (Larger Properties)
While we want every drop of graywater in summer, winter can present a challenge.
If you have a cold winter location, where very little irrigation is required, excess graywater can automatically be diverted to waste. However if the property has a septic waste system, this excess graywater adds load to the septic. Keeping the graywater away from the septic throughout the year can significantly reduce septic maintenance costs.
Instead of having excess graywater being pumped directly to waste, IrriGRAY allows additional irrigation zones to be used just for excess graywater disposal. These zones typically have 500' to 1,000' of Netafim Bioline 0.6 gph dripperline installed between 5" and 24" below ground level. In all cases the depth must exceed the hard freeze depth.
IrriGRAY then diverts this excess graywater (or all graywater if the temperature has dropped below freezing conditions, and no other 'freeze capable' zones are present) to excess graywater zones.
Zones are defined as being of type graywater dripperline, graywater disposal, potable sprinkler and potable dripperline (mainly for vegetable gardens).
Some commercial graywater facilities, such as hotel laundries & laundromats experience significant waste water disposal fees. Check with local authorities to see if they allow reduced disposal fees when all graywater is used on site instead of disposal via the sewer system.
Note: Graywater which is pumped directly to waste (sewer or septic) does not pass through the filter and water meter assembly, and is therefore not measured. Excess graywater that is used for irrigation or onsite disposal using graywater disposal zones is metered and shown on IrriGRAY charts / graphs.