NBBC PM System - NI 195b - Detritus (Street and Environmental Cleanliness)

Detritus (Street and Environmental Cleanliness)

There is no statutory definition of detritus, however, local authority cleansing officers and their contractors have developed a common understanding of the term and the definition used for the NI 195 (and for the LEQSE) is based on this industry norm.
Detritus comprises dust, mud, soil, grit, gravel, stones, rotted leaf and vegetable residues, and fragments of twigs, glass, plastic and other finely divided materials. Detritus includes leaf and blossom falls when they have substantially lost their structure and have become mushy or fragmented.
Grade A is given where there is no detritus present on a transect; grade B is given where a transect is predominantly free of detritus except for some light scattering; grade C is given where there is a widespread distribution of detritus with minor accumulations; and grade D where a transect is extensively covered with detritus with significant accumulations.
Three Intermediate Grades will also be used. These are:
B +, between Grade A and Grade B;
B - , between Grade B and Grade C; and
C -, between Grade C and Grade D