Water Management System
Meander FKM 60

Characteristics

  • System solutions with defined water retention
  • High level of reduction of of water discharge during high intensity rainfall whilst retaining good drainage (even for large roof areas)
  • Peak discharge
  • Discharge coefficient Cs (according to FLL): 0.01 - 0.17 at 2° roof pitch
  • Water storage and discharge delay.
  • Suitable for blue roofs
  • For green and gravel roofs
  • Meander FKM 60 prevents accumulation of water in cases of ponding in depths of up to 40 mm
Weight *120 - 140 kg/m² or 1.2 - 1.4 KN/m² 
Build-up depth120 mm
Roof pitch0-5° (0-9 %)
Vegetation formherbs-grasses-sedum
Water retention

≥ 80 %

Discharge coefficientCs=0.05 - 0.17 ***
Water storageapprox. 38 - 53 l/m²
Discharge yield **15-51 l/s x ha 
Ecological value
Maintenance costs
Cost factor
*Depending on the load capacity of the substructure, Optigreen "High Density (HD)" or "Low Density (LD)" substrates can be used. Weight specifications refer to saturated conditions; dry weight is approximately 60 - 70 % of the saturated weight. In accordance with the requirements of the FLL guideline, the specified weight does not take temporary water accumulation into account.
**For the calculation of the dimensions of the pipe we recommend the discharge coefficient Cs = 0.1. Cs= 0.01 determined for 2 % according to the FLL guideline.
***Determined according to FLL discharge coefficient measurements using a 15-minute reference rainfall r(15) = 300 l/s x ha.
****Depends on slope and system solution. Determined at 0° according to FLL guidelines.

OPTIGREEN VEGETATION MAT

  • Pre-cultivated sedum mat for the  rapid establishment of vegetation in order to prevent wind erosion, with decomposable carrier
  • Alternative: wildflower-based vegetation mats or plug planting
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OPTIGREEN EXTENSIVE SUBSTRATE E
(60 MM) *

  • A substrate with high water storage capacity and good air porosity, tailored to extensive multi layer systems.
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OPTIGREEN COMBI INSPECTION CHAMBER TKS PLUS (NOT SHOWN IN THE DRAWING)

  • Simple control of roof drainage outlets
  • Extendable in 100 mm increments
  • Side and top drainage openings
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OPTIGREEN FILTER FLEECE FIL 105

  • Prevents fine particles from forming sludge in the drainage layer
  • High water permeability
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OPTIGREEN MEANDER WATER RETENTION BOARD FKM 60 (60 MM)

  • Delays discharge of surplus waster
  • Prevents accumulation of water
  • High level of water retention as well as good drainage performance
  • Reduction of required roof outlets
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OPTIGREEN PROTECTION AND STORAGE FLEECE RMS 300