TerraDrain® C-50 Series

TerraDrain® C-50 Series prefabricated chimney drains are constructed by fully wrapping a moderate strength, moderate flow capacity, formed polystyrene perforated core with a nonwoven filter fabric. The filter fabric is bonded to the core to prevent soil intrusion into the flow channels while allowing water to freely enter the drain core from both sides.

TerraDrain® C-50 Series chimney drains are available in 12”, 16” and 24” widths and provide a time saving, effective drainage solution for reducing hydrostatic pressure against retaining walls where full wall coverage is not required or is not feasible.

Metric Values

All values provided are intended for rapid comparison purposes, only. Please refer to a specific product’s Product Data Sheet (PDS) and the disclaimers therein for a detailed listing of all characteristics, associated definitions and values needed for structure design, specification compliance review and product submittal purposes. Please Download PDS for all information transfer, printing and submittal purposes.

Property Test Method Units TerraDrain® C-50 TerraDrain® C-54 TerraDrain® C-56 TerraDrain® C-58


Material 1
Water Flow Rate
ASTM D4491 gpm/ft2 150 150 110 90
Grab Tensile Strength
ASTM D4632 lbs 115 130 160 205
CBR Puncture Resistance
ASTM D6241 lbs 320 360 450 600
Apparent Opening Size
ASTM D4571 US Std. Sieve 70 70 70 80
ASTM D4491 sec-1 2.2 2.1 1.8 1.3
Grab Elongation
ASTM D4632 % 70 70 70 70
UV Resistance
ASTM D4355 % @ 500 hrs 70 70 70 70
AASHTO M 288-06 3
Survivability Class 3 Class 2 Class 1


Material 1
ASTM D1777 in 0.25 0.25 0.25 0.25
Compressive Strength
ASTM D1621 lbs/ft2 9000 9000 9000 9000
Flow Rate 2
ASTM D4716 gpm/ft 12.5 12.5 12.5 12.5
Product Data Sheets

  • 1   PP = Polypropylene; HIPS = High Impact Polystyrene
  • 2   In-plane flow rate measured at 3,600 psf (172 kPa) compressive load and a hydraulic gradient of 1.0.
  • 3   AASHTO Designation: M 288-06 Standard Specification for Highway Applications; American Association of State Highway and Transportation Officials, 2006. Geotextile survivability classification from installation stresses in subsurface drainage applications.