Area of application and sizing

Sizing instructions

As a general rule, the PURAIN rainwater filter is selected based on the diameter of the rainwater collecting pipe e.g. 100mm = PR100.

If the diameter of the planned collecting pipe is not known, then you can refer to the following table. It gives an overview of the dimensions of these rain water connection pipes, as per DIN 1986, with measured rainfall yield indicator of r = 300 l/s ha and a slope of 1.5%. The discharge coefficient indicates by what factor the amount of rain discharged may be reduced, due to the type of roof used.

  • Discharge coefficient 1 = theoretical value
  • Discharge coefficient 0.8 = inclined roof
  • Discharge coefficient 0,5 = extensively grassed roof

Flow rate and connectable roof areas

  Flow rate with 1,5 % slope DIN 1986 [l/s] Discharge coefficient = 1,0 Discharge coefficient = 0,8 Discharge coefficient = 0,5
DN100 5,7 190 m² 238 m² 380 m²
DN150 16,9 564 m² 705 m² 1.128 m²
DN200 36,3 1.210 m² 1.513 m² 2.420 m²
DN300 106,1 3.537 m² 4.422 m² 7.074 m²
DN400 226,8 7.560 m² 9.450 m² 15.120 m²

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