Assertion: efficiency | /r/HasProperty | determined
Facets:
value: often
type: DEGREE
value: from this sort of test
type: OTHER
Source sentences:
text: Often the well efficiency is determined from this sort of test, this is a percentage indicating the fraction of total observed drawdown in a pumping well which is due to aquifer losses (as opposed to being due to flow through the well screen and inside the borehole).