Attach G- Engineering Report

                                                                            Preliminary Pipe Size Calculations
                                                       Date:         4/02/2016           Document No.:                      15087-Pipe Size
                                                        By:             MS                Revision No.:                         Draft


                                                                                                     Project No:            15087

                                  PROJECT: Supermarket Development
                                  ADDRESS: 3 Garnet Street Cooroy
                               CATCHMENT: External

                     Runoff Coefficient (C10) - Developed:                0.90                    (QUDM Table 4.05.3 (a))
                                                                                      2
                     Catchment Area - Developed:                          31000       m                              tc =            13 min.

                                                        Parameters
ARI                                        2yr         5yr          10yr                   20yr            50yr             100yr
Rainfall Intensity        mm/hr           110.0       136.0        151.0                  171.0           199.0             219.0
Frequency Factor           fy=            0.85         0.95         1.00                   1.05            1.15              1.20
Developed C                Cd=            0.77         0.86         0.90                   0.95            1.00              1.00
Developed Flow             l/s            724.6       1001.3       1170.3                 1391.5          1713.6            1885.8

Diameter (m)                  0.750
Radius (m)                    0.375

Longitudinal =                    33
Slope 1in….

Mannings n =                  0.012                                                                    PIPE

Area =                        0.442

Wetted =                      2.357
Perimeter

Hydraulic =                   0.188
Radius

Velocity =                    4.752 m/s

No. Barrels =                      1

Flow Q =                      2.100 m³/s
                               2100 l/s

                     ARI                   2yr          5yr               10yr             20yr               50yr          100yr
                     CAPACITY?             OK           OK                 OK               OK                 OK            OK

QUDM (5.12.7)
                 V = (R^2/3 * S^1/2)/n                         R = Hydraulic Radius
                                                               S = Friction Slope
                                                               n = Manning's roughness coefficient
                 Q = AV                                        A = Area
                                                               V = Velocity




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