The total number of identified and validated information requirements
distributed according to their categories is provided in
Table 4. Given a category of information, Table 4 shows the number
of information items identified in Phases I and II and articulated
also in the validation phase (Phase III). For the task of internal erosion
evaluation, the total number of information requirements identified
by triangulation of three methods is 472, and approximately
66% of those information requirements were consistently identified
in both phases. The hydraulic- and hydrologic-related categories do
not have large coverage in the second phase, because when the internal
erosion is the dominant failure mode, more information regarding
geologic and geotechnical information is pronounced due
to the nature of the problem.
Table 3 shows that the soil characteristics, elevation of the structures,
and water level readings in time series are always articulated
in each category. This finding is quite normal when the definition of
internal erosion is considered. Internal erosion failures mainly occur
due to the existence of two major agents: soil and flow of water.
Therefore, the information related to soil and water behaviors are
frequently pronounced.