Building Construction
During percussion drilling

Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
The soil to a considerable depth below the bottom of the hole gets disturbed
All listed here
Caving or mixing of strata are caused in soft soils or cohesion-less soils

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Building Construction
Single Flemish bond consists of

Double Flemish bond facing and header bond backing in each course
Stretcher bond facing and double Flemish bond backing in each course
English bond facing and double Flemish bond backing in each course
Double Flemish bond facing and English bond backing in each course

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