Assertion: septic tank's level | /r/HasProperty | detected
Facets:
Source sentences:
text: A high level of sewage in the septic tank is detected by observing that the top surface of the sewage in the septic tank is higher than the bottom of the septic tank outlet pipe.
text: A low level of sewage in the tank is detected by observing, when septic tank is opened, that the top of the floating scum layer is one or more inches below the bottom of the septic tank outlet pipe.