STORMWATER DRAINAGE DISPOSAL REQUIREMENTS

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					                                                                   Enquires to: City of Geraldton-Greenough
                                                                  Department of Community Infrastructure

                                                                                              CIDA 003
                                                                                           Date: August 08



STORMWATER DRAINAGE DISPOSAL REQUIREMENTS
           FOR INDUSTRIAL, COMMERCIAL AND UNIT DEVELOPMENTS

   The City of Geraldton-Greenough requires that, generally stormwater runoff from
industrial, commercial or multi-unit developments (anything or two units) is retained on
         site by the use of soak wells, open sumps or a combination of the two.

            The formula given below will give the required storage volume:


                          Total impervious area* in m² x 0.9
                                            DIVIDED BY


                               60 for sand or 50 for clay

                           = storage volume required in m³
                             * Total Impervious Area = roof’s, paving etc




                                        SOAKWELLS

                                                                 Area drained per Soakwell
Diameter         Depth           Volume
                                                       Ea/60 m²             Ea/50 m²        Landscaping m²


  600             600              0.17                    11.3                 9                56

  900             900              0.57                     38                 32                171

  1200           1200              1.36                     91                 77                408

  1800            600              1.53                    102                 85                460

  1800           1200              3.05                    205                170                915

  1800           1800              4.58                    305                254               1375

                                     LEACH DRAINS

                             0.30 m³ per metre - Standard

                              0.42 m³ per metre – G.B.C.




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