00430.00 368 Section 00430 - Subsurface Drains Description
00430.00 Scope - This Work consists of constructing subsurface drains to the lines and grades
shown or established using drain pipe, special filter Material or granular drain Material, and drainage geotextile.
00430.01 Descriptive Terms - The terms used in designating drain pipe or when referring to them
on the Plans are as follows: Aluminum - The base metal for aluminum sheets. Concrete, Steel, Aluminum, Polyethylene, Polyvinyl Chloride - The basic M aterial of the pipe. Drain Pipe - Perforated pipe of specified Material. Metal - Aluminum and steel. Steel - The base metal for galvanized or aluminum coated sheets. Subsurface Drain - Drainage system beneath the Base , usually with a perforated drain pipe, to collect and drain groundwater.
00430.02 Contractor's Options - If the Contractor has an option of using different kinds of pipe, the
option and its limitations will be shown. The limiting factors and requirements shown are minimums. The Contractor may substitute stronger, larger, and higher quality Material at any installation site, provided the substitution meets the approval of the Engineer and is made at no additional cost to the Agency.
00430.03 Size Determination - The nominal size of pipe will be determined according to AASHTO
tolerances for pipe dimensions for the appropriate kind or class of pipe. Materials
00430.10 Materials - Furnish Materials meeting the following requirements:
Commercial Grade Concrete ...................................................................... 00440 Delineators ................................................................................................. 00840 Drainage Geotextile .................................................................................... 02320 Perforated Concrete Pipe ...................................................................... 02410.10 Perforated Corrugated Aluminum Alloy Pipe ......................................... 02420.50 Perforated Corrugated Polyethylene Pipe ............................................. 02415.10 Perforated Corrugated Steel Pipe ......................................................... 02420.30 Perforated Polyvinyl Chloride Pipe ........................................................ 02415.50 Protective Coatings ............................................................................... 02420.20 Special Filter Materials .......................................................................... 02610.10 Furnis h wire mesh that is commercial quality 1/4 inch galvanized metal screening.
00430.11 Granular Drain Backfill Material - Furnish granular drain backfill M aterial of 1 1/2" - 3/4",
1 1/4" - 3/4", or 3/4" - 1/2" crushed or uncrushed Rock or Gravel meeting the requirements of 02690.20( c) and the following gradation requirements: 00430.46 369 Percent Passing (by weight) Designated Sizes Sieve Size 1 1/2" - 3/4" 1 1/4" - 3/4" 3/4" - 1/2" 2" 100 1 1/2" 95 - 100 100 1 1/4" − 90 - 100 1" − − 100 3/4" 0 - 15 0 - 15 90 - 100 1/2" 0 - 2 0 - 2 0 - 15 1/4" − − 0 - 3 Construction
00430.40 General - Excavate trench, prepare bedding, backfill, except as noted in 00430.46,
according to Section 00405 and dispose of excavated materials according to Section 00330. If required, place geotextile according to Section 00350 before backfilling. Install a Type W -1 delineator at each outlet protection block as shown.
00430.41 Foundations in Unyielding Material - Excavate Rock , hardpan or other unyielding
materials a minimum of 3 inches below established grade of the pipe exterior to place special filter Material or drain backfill M aterial.
00430.42 Laying Pipe - Lay the pipe according to Section 00445. Place pipe with perforations down
unless otherwise directed.
00430.43 Joining Pipe - Fasten pipes together with appropriate coupling fittings or bands as
specified for the type of pipe used. Close upstream end of pipe with plugs suitable to prevent entry of Soil mater ials.
00430.44 Contact Surfaces, Aluminum to Concrete - Coat aluminum pipe and aluminum coated
steel pipe that contact s portland cement concrete with asphalt mastic according to Section 00445.
00430.45 Inspection - The installation will be inspected after the pipe is laid and joined and before
backfilling. Remove and reinstall or replace any pipe found to be out of alignment, unduly settled or damaged.
00430.46 Backfilling:
a.Special Filter Material - After the pipe is installed and inspected, place up to 12 inches of uncompacted special filter Material above the top of the pipe. Above this, place approved backfill Material or special filter Material , as directed, and compact according to Section 00405.
b.Granular Drain Backfill Material - Drainage geotextile is required when using granular drain backfill Material . Place granular drain backfill M aterial according to (a) above and as shown. 00430.80 370 Measurement
00430.80 Measurement - The quantities of subsurface drain pipes of the vari ous kinds, types, and
sizes will be measured, with no deduction for fittings and special sections, along the pipe flow line from end to end of pipe. The quantities of subsurface drain outlets will be measured on the unit basis. Drainage geotextile will be measured according to 00350.80. Delineators will be measured according to 00840.80. Trench resurfacing will be measured according to 00495.80. Payment
00430.90 Payment - The accepted quantities of Work performed under this Section will be paid for
at the Contract unit price, per unit of measurement, for the following items: Pay Item Unit of Measurement
a.____ Inch Drain Pipe ............................................................................ Foot
b.Subsurface Drain Outlets ...................................................................... Each In item (a), the nominal diameter of pipe will be inserted in the blank. Item (b) includes furnishing and installing pipe, constructing outlet protection blocks, connecting pipe to inlets, and excavating and disposing of excess materials. Payment will be payment in full for furnishing and placing all Material s, and for furnishing all Equipment , labor, and Incidental s necessary to complete the Work as specified. Drainage geotextile will be paid for according to 00350.90. Delineators will be paid for according to 00840.90. Trench resurfacing will be paid for according to 00495.90. No separate or additional payment will be made for trench excavation, backfill, special filter Material, or granular drain backfill Material or for fittings and special pipe sections.
Subsurface Drains in other states
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 434–436 of 1,268. View official source ↗