SECTION 512 - FRENCH DRAINS
512.01 Description This work shall consist of furnishing, placing and compacting stone
and gravel and furnishing and placing erosion control geotextile for French drains in accordance with these specifications and in reasonably close conformity with the lines and grades shown in the Contract.
512.02 Materials. Materials shall meet the requirements of the following Sections of
Division 700 — , Materials.
Aggregate for Subbase 703.06(b) G r a v e l B o r r o w 703.20 Stone for French Drains 703.24 Erosion Control Geotextile 722.03 (Class 1) Gravel for French drains shall meet the requirements of either Aggregate for Subbase, Type D, or Gravel Borrow, at the Contractor's option.
512.03 Drains Stone shall be placed behind and against the structures with the bottom
of the stone at the elevation of the flow line of the weeper drains. The stone shall form a box section, 2 feet wide and 2 feet high, for the entire length of the structure. Erosion control geotextile shall be installed to separate the stone box section from the surrounding gravel. Installation of the erosion control geotextile shall be in accordance with Section 620, Geotextiles. Gravel shall be placed to form a box section around the stone, to the limits of 2 feet above the stone, 2 feet behind the stone and 2 feet below the stone, but not to be placed below the top of the footing. 5-118 Gravel for French drains shall be compacted to the same requirements as the adjacent embankment.
512.04 Method of Measurement French drains will be measured as one lump sum unit,
satisfactorily placed and accepted. Excavation for French drains will be measured for payment in accordance with Section 206, Structural Excavation.
512.05 Basis of Payment French drains will be paid for at the Contract lump sum price,
complete in place. Payment will be made under: P a y I t e m P a y U n i t 512.081 French Drains Lump Sum
French Drains in other states
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