Assertion: lake's source | /r/CapableOf | produce more than 4 billion liters
Facets:
value: a day of untreated
type: TEMPORAL
Source sentences:
text: Some South African scientists believe that this figure might be higher  with the main source being dysfunctional sewage works that produce more than 4 billion liters a day of untreated, or at best partially treated, sewage effluent that discharges into rivers and dams.