(E) Plastic lines. Plastic lines shall be encased within
the right of way on crossings, and must have at least 30 inches of
(F) Aboveground appurtenances. Except for vents, no
above ground utility appurtenances for gas lines shall be permitted
within the right of way.
(2) High-pressure pipelines and saltwater pipelines.
(A) Depth of cover for crossings.
(i) Depth of cover is the depth to the top of the carrier
pipe or casing, as applicable. Where materials and other conditions
justify, such as on existing lines remaining in place, the district
may approve a minimum depth of cover under the pavement structure
of 12 inches or one-half the diameter of the pipe, whichever is greater.
For encased high-pressure pipeline, the minimum depth of cover shall
(I) the greater of 18 inches or one-half the diameter
of the pipe, under pavement structures;
(II) 30 inches if the line is outside the pavement
structure or under a ditch; or
(III) 36 inches for unencased sections of encased lines
outside the pavement structure.
(ii) Where a reinforced concrete slab is used to protect
the pipeline, the district may authorize a reduction in the depths
specified in this section. For unencased high-pressure pipelines,
the minimum depth of cover is as follows:
(I) 60 inches under the pavement surface or 18 inches
under the pavement structure in paved areas; or
(II) 48 inches if the line is placed outside the pavement
structure or under a ditch.
(B) Depth of cover for longitudinal placement. The
minimum depth of cover shall be 48 inches.
(C) Encasement. Casing shall consist of a vented steel
(i) Where encasement is not employed, the utility shall
show that the welded steel carrier pipe will provide sufficient strength
to withstand the internal design pressure and the dead and live loads
of the pavement structure and traffic. Additional protective measures
(I) heavier wall thickness, higher factor of safety
in design, or both;
(II) adequate coating and wrapping;
(III) cathodic protection; and
(IV) the use of Barlow's formula regarding maximum
allowable operating pressure and wall thickness, as specified in 49
(ii) Shallow anode bed types exceeding 48 inches in
width shall not be permitted in the right of way. All others must
have a depth of coverage of at least 36 inches. Deep well anode beds
of up to 60 inches in diameter are acceptable. Rectifier and meter
loop poles shall be placed at or near the right of way line.
(iii) The minimum length of the additional protection
shall be the same as that required for an encased crossing.
(iv) The district may allow existing lines under low-volume
highways to remain in place without encasement or extension of encasement
if they are protected by a reinforced concrete slab or equivalent
protection or if they are located at a depth of five feet under the
pavement structure and not less than four feet under a highway ditch.
(E) Vents. Vents shall be installed at both ends of
a casing, regardless of length, with a marker on at least one end.
Vents shall be placed at the right of way line immediately above the
pipeline, situated so as not to interfere with highway maintenance
or be concealed by vegetation. The owner's name, address, and emergency
telephone number shall be shown on each vent marker.
(F) Aboveground appurtenances. Aboveground appurtenances,
except vents for gas lines, shall not be permitted within the right
(c) Water lines.
(1) Material type. All material types used for water
lines shall conform to American Waterworks Association, applicable
local requirements, and 30 TAC §290.44(a)(relating to Water Distribution).
(2) Depth of cover. The minimum depth of cover shall
be 30 inches, but not less than 18 inches below the pavement structure
(3) Encasement. Unless another type of encasement is
approved by the district, water lines crossing under paved highways
must be placed in a steel encasement pipe within the limits of the
right of way. At the district's discretion, encasement may be omitted
under center medians and outer separations that are more than 76 feet
wide. At the district's discretion, encasement under side road entrances
may be omitted in consideration of traffic volume, condition of highway,
maintenance responsibility, or district practice. Existing water lines
24 inches or greater may be allowed to remain unencased under the
pavement of new low volume highways, provided depth and all other
requirements of 30 TAC §290.44 are met.
(4) Manholes. The width dimensions shall be no larger
than is necessary to hold equipment involved and to meet safety standards
for maintenance personnel. The maximum inside diameter of the manhole
chimney shall not exceed 48 inches. The outside diameter of the manhole
chimney at the ground level shall not exceed 36 inches.
(5) Aboveground appurtenances.
(A) Fire hydrants and valves. When feasible, fire hydrants
and blow-off valves are to be located at the right of way line. Fire
hydrants shall not be placed in the sidewalk or any closer than five
feet from the back of the curb. Valve locations shall be placed so
as not to interfere with maintenance of the highway.
(B) Water meters. Individual service meters shall be
placed outside the limits of the right of way. Master meters for a
point of service connection may be placed in a manhole with a maximum
width of 48 inch inside diameter. If additional volume is required,
a manhole with a neck of 60-inch depth must be used.
(C) Service lines crossing highway by bore. Lines for
customer service that cross the highway may be placed in a high-density
polyethylene (HDPE) encasement pipe without joints (rolled pipe).
(d) Nonpotable water control facilities.
(1) Applicability. This subsection applies to agricultural
irrigation facilities, water control improvement districts, municipal
utility districts, flood control districts, canals, and similar nonpotable
water control facilities.
(2) Depth of cover for buried pipe facilities. The
minimum depth of cover, regardless of type of pipe used, shall be
30 inches, but not less than 18 inches below any pavement structure.
(3) Encasement for buried pipe facilities. Unless the
district approves another type of encasement, all non-potable water
control lines crossing under paved highways within the right of way
must be placed in a steel encasement pipe. At the district's discretion,
encasement may be omitted under center medians and outer separations
that are more than 76 feet wide.
(4) Location and design requirements. Open ditch facilities
and buried pipe facilities designed and constructed in accordance
with this subchapter may be installed across the right of way. Longitudinal
buried pipe facilities installed within the right of way must conform
with §21.41(c) of this subchapter (relating to Overhead Electric
and Communication Lines), consistent with the clearances applicable
to all roadside obstacles. Open ditch facilities shall not be installed
longitudinally within the right of way, nor will any aboveground appurtenances
be permitted within the horizontal clearance.
(5) Levee/ditch travel road location. Coordination
with and approval by the district is required where levee/ditch travel
roads intersect the highway.
(e) Sanitary sewer lines.
(1) Material type. All material types used for sanitary
sewer lines shall conform to applicable provisions of 30 TAC Chapter
217 and applicable local requirements.
(2) Depth of cover. The minimum depth of cover shall
be 30 inches, but not less than 18 inches below any pavement structure.
(3) Encasement. Pressurized line crossings under paved
highways within the limits of the right of way shall be placed in
a steel encasement pipe. Gravity flow lines not conforming to the
minimum depth of cover shall be encased in steel or concrete. At the
district's discretion, encasement may be omitted under center medians
and outer separations that are more than 76 feet wide.
(4) Manholes. Manholes serving sewer lines up to 12
inches shall have a maximum inside diameter of 48 inches. For lines
larger than 12 inches, the manhole inside diameter may be increased
an equal amount, up to a maximum diameter of 60 inches. Manholes for
large interceptor sewers shall be designed to keep the overall dimensions
to a minimum. The outside diameter of the manhole chimney at the ground
level shall not exceed 36 inches.
(5) Lift stations. Lift stations and pump stations
for sanitary sewer lines exceeding 48 inches inside diameter shall
be located outside the limits of right of way.
(f) Electric and communication Lines.
(1) Underground electric lines.
(A) Depth of cover. All underground electric lines
placed within the right of way may be installed by direct bury at
depths according to the voltage of electric lines as required by the
National Electrical Safety Code and as shown in the following chart.
(B) Encasement. Electric lines crossing the roadway
shall be encased in steel or comparable material greater than or equal
to that of ductile iron, with satisfactory joints, or materials and
designs that will provide equal or better protection of the integrity
of the highway system and resistance to damage from corrosive elements
to which they may be exposed. The lines shall be buried a minimum
of 36 inches under highway ditches, and 60 inches below the pavement
structure. Encasement shall be provided as outlined in this section.
(C) Installation. Longitudinal underground electric
lines may be placed by plowing or open trench method. All plowing
and trenching shall be performed in a uniform alignment with the right
of way. If the installation of the facility is found to deviate from
the approved location, the district, at its sole discretion, may require
the adjustment of the facility to the approved location. The utility
facility shall be located as set forth in §21.37(b) of this subchapter.
(D) Aboveground appurtenances.
(i) Aboveground appurtenances installed as part of
an underground electric line shall be located at or near the right
of way line, and shall not impede highway maintenance or operations.
(ii) Structures that are larger in plan view than single
poles may be placed on the right of way if:
(I) the installation will not hinder highway maintenance
(II) the housing will be placed at or near the right
of way line;
(III) the installation will not reduce visibility and
sight distance of the traveling public;
(IV) the dimensions of the housing are minimized, particularly
where the need to allow space for highway improvement or accommodation
of other utility lines is apparent;
(V) the outside width, length (longitudinal with respect
to the right of way), and height dimensions of the aboveground portion
of the housing do not exceed 36 inches, 60 inches, and 54 inches respectively;
(VI) the supporting slab does not project more than
three inches above the ground line, nor extend more than 12 inches
on either side of the housing structure; and
(VII) the installation will be compatible with adjacent
(E) Manholes. Manholes serving electric and communication
lines shall conform to the requirements of this section.
(F) Abandonment. Underground electric lines may be
abandoned in place at the discretion of the district.
(2) Underground communication lines.
(A) Longitudinal. The minimum depth of cover for cable
television and copper cable communications lines shall be 24 inches.
The minimum depth of cover for fiber optic facilities shall be 42
inches. If the utility that is the owner/operator of a fiber optic
facility waives damages and fully indemnifies the department in a
form acceptable to the department, the minimum depth of cover may
be reduced to not less than 36 inches.
(i) The minimum depth of cover for cable television
and copper cable communication lines shall be 24 inches under ditches
or 18 inches beneath the bottom of the pavement structure, whichever
(ii) The top of the fiber optic facility shall be placed
a minimum of 42 inches below the ditch grade or 18 inches below the
pavement structure or 60 inches below the top of the pavement surface,
whichever is greater. The department may authorize a minimum depth
of cover of not less than 36 inches below the ditch grade or 60 inches
below the top of the pavement surface, whichever is greater, if the
utility waives damages and fully indemnifies the department in a form
acceptable to the department.
(iii) The department may require encasement or other
suitable protection when necessary to protect the highway facility
when the line is located:
(I) at less than minimum depth;
(II) near the footing of a bridge or other highway