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Fields for table: RHB_SUBDRAINAGE

Field NameCodesData TypeUnitsTest ProtocolDescription
SHRP_ID

VARCHAR2(4)


Test section identification number assigned by LTPP program. Must be combined with STATE_CODE to be unique.
PIPE_DIAMETER

NUMBER(3,1)
in

Diameter of sub drain pipe.
PIPE_DEPTH

NUMBER(3,1)
in

Average depth from the top of the pavement surface to the top of the sub drain pipe.
HORIZ_PIPE_PLACEMENT

NUMBER(3,1)
in

Horizontal distance between the edge of the full depth pavement surface and the centerline of the sub drain pipe.
FILTER_TYPE
FILTER_TYPENUMBER(1)


Code indicating the type of primary filter material used to prevent clogging of drain.
FILTER_TYPE_OTHER

VARCHAR2(40)


Type of primary filter material used to prevent clogging of drain if other than those specified.
MAX_PARTICLE_SIZE

NUMBER(2,1)
in

Maximum aggregate size used for the primary filter material (if granular).
NO_4_PASSING

NUMBER(3,1)
%

Percent primary filter material (if granular) passing #4 sieve.
NO_10_PASSING

NUMBER(3,1)
%

Percent primary filter material (if granular) passing #10 sieve.
NO_40_PASSING

NUMBER(3,1)
%

Percent primary filter material (if granular) passing #40 sieve.
NO_100_PASSING

NUMBER(3,1)
%

Percent primary filter material (if granular) passing #100 sieve.
STATE_CODE
STATE_PROVINCENUMBER(2)


Numerical code for state or province. U.S. codes are consistent with Federal Information Processing Standards.
FILTER_PERMEABILITY

NUMBER(5)
ft/day

Average permeability of the primary filter material.
TYPE_LOC_FILTER
TYPE_LOC_FILTERNUMBER(1)


Code indicating the type and location of secondary filter material (if applicable).
TYPE_LOC_FILTER_OTHER

VARCHAR2(40)


Type and location of secondary filter material if other than those specified.
OUTLET_INTERVAL

NUMBER(3)
ft

Approximate average distance between adjacent subdrainage outlets.
SUBDRAIN_PURPOSE
SUBDRAIN_PURPOSENUMBER(1)


Code indicating the primary purpose of subdrainage installation.
SUBDRAIN_PURPOSE_OTHER

VARCHAR2(40)


Primary purpose of subdrainage installation if other than those specified.
RECORD_STATUS

VARCHAR2(1)


A code indicating the general quality of the data.
DATE_COMPLETE

DATE


Date activity was completed.
CONSTRUCTION_NO

NUMBER(2)


Event number used to relate changes in pavement structure with other time dependent data elements. This field is set to 1 when a test section is initially accepted into LTPP and is incremented with each change to the layer structure.
SUBDRAIN_TYPE
SUBDRAIN_TYPENUMBER(1)


Code indicating the type of subdrainage.
IMP_TYPE
MAINT_WORKNUMBER(2)


Code for type of maintenance or rehabilitation work performed.
SUBDRAIN_EXTENT
SUBDRAIN_EXTENTNUMBER(1)


Code for extent of sub drains.
DRAINAGE_PIPE_TYPE
DRAINAGE_PIPENUMBER(1)


Code indicating type of pipe used as sub drains.
DRAINAGE_PIPE_OTHER

VARCHAR2(40)


Type of drainage pipe if other than those specified.