Waste water drainage plan of the building into the wastewater treatment system, waste water drainage from the show room opening into the wastewater treatment system (color map with specified symbol).
Plan showing drainage of the wastewater treatment plant. It shows the sewers of room to waste water treatment systems. (A color chart and the symbols).
The plan shows the sewerage from a building to a wastewater treatment system. By showing the drain away from the room to the waste water treatment system A plan with a specific color (symbol).