Attachment C - Stormwater report

Table of Contents
1.     Introduction                                                             6
       1.1.    Objective                                                        6
2.     Site Description                                                         7
       2.1.    Land use                                                         7
       2.2.    Topography                                                       7
3.     Land Use and Nutrient Loads                                              8
       3.1.    Historical Land Use                                              8
       3.2.    Proposed Land Use                                                8
4.     MUSIC Modelling                                                         10
       4.1.    Rainfall Data                                                   10
       4.2.    Evapotranspiration Data                                         10
       4.3.    Regional Modelling                                              11
               4.3.1. Model Objectives                                         11
               4.3.2. Catchment Description                                    11
               4.3.3. Rainfall Runoff Parameters                               14
               4.3.4. Pollutant Export Parameters                              14
               4.3.5. Regional MUSIC Model Layout                              15
               4.3.6. Modelling Results                                        15
       4.4.    Site Specific MUSIC Model                                       16
               4.4.1. Model Objectives                                         16
               4.4.2. Pollutant Export Parameters                              16
               4.4.3. Treatment Options                                        18
               4.4.4. MUSIC Results                                            19
5.     Flooding and Water Quantity Management                                  21
       5.1.    Introduction                                                    21
       5.2.    Catchments                                                      21
       5.3.    Rainfall Intensities                                            21
       5.4.    Hydrologic Modelling                                            22
               5.4.1. Rainfall Losses                                          22
               5.4.2. Roughness Coefficients                                   22
       5.5.    Peak Flow Rate                                                  22
       5.6.    Regional Flooding                                               24
       5.7.    Mitigation Measures                                             25
6.     Erosion and Sediment Control (ESC)                                      26
       6.1.    Erosion Risk Assessment                                         26
       6.2.    Erosion Control and Rehabilitation                              27
       6.3.    Drainage Control                                                28
               6.3.1. Design Standard                                          28
       6.4.    Sediment Control                                                28
               6.4.1. Design Standard                                          28
       6.5.    Roles and Responsibilities                                      29
       6.6.    Corrective and Preventative Action                              29
7.     Summary and Recommendations                                             31
8.     Reference List                                                          33



Stormwater Management Plan – Lot 1 on SP108094, 305 Lake Macdonald Drive   Page iv

D’VINERIPE
R003370