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Transportation Research Thesaurus

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Each term in the TRT is assigned a unique notational code that conveys its location within the hierarchy. The first letter of the notation represents the facet or top term. Using the notational code it is easy to determine the terms relation in the hierarchy. The term's parent (Ae) will have one less letter (from the right end) as the term (Aea). Siblings (Aeg, Aes) will have the same notational code as the term except the last letter will be different. Children (Aeac, Aeah) will have one letter appended to the end of the notational code of the term.

Hierarchical Display

Top Terms> Facilities > Transportation, hydraulic and utility facilities > Hydraulic structures > Irrigation and drainage structures > Drainage structures > Sewers

Pmhpd: Drainage structures
Pmhpds: Sewers
 Pmhpdss: Storm sewers

Broader Term:
Pmhpd: Drainage structures
 
Related Terms:
Pmhpdb: Catch basins
Pmhpdc: Detention basins
Pmhpdd: Ditches
Pmhpde: Drainage canals
Pmhpdf: Drains
Pmhpdh: Drainage basins
Pmhpdj: Drainage blankets
Pmhpdm: Grates
Pmhpdp: Gutters
Pmhpdq: Manholes
Pmhpdu: Sumps
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