440-1 Description.
Construct underdrains, underdrain cleanout structures, underdrain inspection boxes and underdrain outlet pipes in accordance with the Plans and Standard Plans, Indexes 440 -001 and 440-002. Use any one of the types of pipe listed in 440 -2, unless a particul ar type is specifically required. Use only perforated pipe, and do not use open joints.
440-2 Materials.
Meet the following requirements: Concrete Pipe ................................ ...................... Section 449 Filter Aggregate ................................ .................. Section 902 Corrugated Steel Pipe ................................ .........Section 943 Corrugated Aluminum Pipe ................................ Section 945 Polyvinyl -Chloride Pipe ................................ ......Section 948 Corrugated High Density Polyethylene Pipe ......Section 948 Corrugated Polypropylene Pipe .......................... Section 948 Steel Reinforced Polyethylene Ribbed Pipe .......Section 948 Filter Fabric Sock ................................ ................ Section 948 Geotextile Fabrics* ................................ .............Section 98 5 *Use products listed on the Department’s Approved Product List (APL).
440-3 Excavating Trench.
Excavate the trench carefully, to the depth required to permit the pipe to be laid to the grade required, and to the dimensions shown in the Plans.
440-4 Laying Pipe.
440-4.1 General: Bed the pipe firmly on the bottom of the trench, with the perforations
down and joints securely made.
440-4.2 Corrugated Steel Pipe - Protection of Coating: Handle corrugated steel pipe in
such a way that the zinc or aluminum co ating will not be bruised or broken. Do not use pipe showing bruises or breakage of the zinc or aluminum coating.
440-4.3 Protection of Drain Inlet: Protect the influent end of the pipe in a manner which
will prevent any soil from entering the drain.
440-4.4 Lateral Connections: Make lateral connections with prefabricated wyes, tees,
elbows, etc., as required.
440-4.5 Underdrain Inspection Box: Construct underdrain inspection boxes in
accordance with Standard Plans, Index 440-002 and the Plans.
440-4.6 Underdrain Cleanout Structures: Construct underdrain cleanout structures of
in-line wye fittings and stub for access where called for in the Plans.
440-4.7 Underdrain Outlet Pipe: Use non-perforated pipe. Construct underdrain bends
in accordance w ith Standard Plans, Index 440 -002.
440-5 Placing Filter Material and Backfilling.
440-5.1 Placing Material: After laying the pipe and obtaining the Engineer’s approval,
backfill the trench with filter material to the lines shown in the Plans. FY 2023-24 Return to Table of Contents
440-5.2 Compaction of Filter Material and Protection of Pipe: Place and compact the
filter material around the pipe and for the full width of the trench, in layers not exceeding 6 inches in thickness. Take special care to avoid displacement or damage to the pipe.
440-5.3 Backfill Above Filter Material: For all types of pipe, backfill the portion of the
trench above the filter material with suitable pervious material. Place and compact the material in layers not exceeding 4 inches in thickness.
440-6 Type V Underdrain Construction.
To prevent clogging of Type V underdrain from construction sediments, initially excavate the associated stormwater facilities to rough grade. After the contributing drainage area is stabilized, construct the underdrains and excavate the sto rmwater facilities to achieve the final elevation.
440-7 Method of Measurement.
The quantities to be paid for will be the length, in feet, of underdrain, which includes underdrain cleanout structures, measured in place, along the centerline and gradient o f the underdrain, completed and accepted. The quantities to be paid for will be the length, in feet, of outlet pipe measured in place, along the centerline and gradient of the outlet pipe, completed and accepted. The quantity of underdrain inspection boxes to be paid for will be the number completed and accepted. No separate measurement or payment will be made under this Section for underdrains associated with box culverts or the Standard Plans, Index 400 -289.
440-8 Basis of Payment.
Price and payment wil l be full compensation for all the work specified in this section, including all materials, disposal of materials, pipe and fittings, stubbing into drainage structures , and all excavation except the volume included in the items for the grading work. Payment will be made under: Item No. 440 - 1- Underdrain - per foot. Item No. 440 - 70- Underdrain Inspection Box - each. Item No. 440 - 73- Underdrain Outlet Pipe - per foot. FY 2023-24 Return to Table of Contents SECTION 443 FRENCH DRAINS
443-1 Description.
Construct french drains , utilizing one of the authorized types of pipe, with coarse aggregate, or ballast rock when specified, and filter fabric.
443-2 Materials.
443-2.1 Pipe: Unless a particular type is specified in the Plans, pipe furnished may be
any of the following types:
1.Concrete Pipe (Bell & Spigot): Slotted or perforated concrete pipe may be used. Meet the requirements of Section 449 for concrete pipe. Do not use g askets. Fully insert the spigot in the bell, and bring home. Conform to Standard Plans, Index 443-001 for slotted pipe. Use perforated pipe having perforations equally located 360 degrees around the pipe. Use pipe having not less than 30 round perforations , 3/8 inch each, per square foot of inside pipe surface. Extend perforations to within 6 inches of the bell or spigot area. The Engineer will permit other perforations not less than 5/16 inch nor more than 3/8 inch in the least dimension if they provide an opening area not less than 3.31 in2/ft2 of pipe surface.
2.Corrugated Aluminum Alloy Culvert Perforated Pipe: Meet the requirements of Section 945. Use perforated pipe having perforations equally located 360 degrees around the pipe. Locate perforations either on the inside crests or on the neutral axis of all corrugations except that perforations are not required within 4 inches of each end of each length of pipe or in a corrugation where seams are located. Provide pipe having not less than 30 round perforations, 3/8 inch each, per square foot of pipe surface. The Engineer will permit other perforations not less than 5/16 inch nor more than 3/8 inch in the least dimension if they provide an opening area not less than 3.31 in2/ft2 of pipe surface.
3.Corrugated Steel Perforated Pipe: Meet the requirements of Section 943. Meet the perforation requirements as specified in (2) above.
4.Bituminous Coated Corrugated Steel Perforated Pipe: Meet the requirements of Section 943. Meet the perforation require ments as specified in (2) above. Place the perforations prior to the bituminous coating. The Engineer will accept the minimum opening of not less than 3.31 in2/ft2 of pipe if 50% of the opening area is maintained after coating.
5.Corrugated High -Density Polyethylene (HDPE) Perforated Pipe: Meet the requirements of Section 948. Meet the perforation requirements as specified in (2) above.
6.Polyvinyl Chloride (PVC) Perforated Pipe: Meet the requirements of Section 948. Meet the perforation requirements as specified in (2) above.
7.Corrugated Polypropylene Perforated Pipe: Meet the requirements of Section 948. Meet the perforation requirements as specified in (2) above.
443-2.2 Coarse Aggregate: Meet the requirements of 901 -1.4 for No. 4 stone.
443-2.3 Select Fill: Use select fill meeting the requirements of Section 911.
443-3 Excavating Trench.
Excavate the trench in accordance with Section 125 unless specific trench excavation procedures are described in the Plans. FY 2023-24 Return to Table of Contents
Source: Florida Standard Specifications for Road and Bridge Construction, 2024 Edition. Pages 489–490 of 1,299.