Attachment 7 - Flood Impact Assessment - Covey · 132005.638.06

          CONTENTS
         1.0    INTRODUCTION                                                4
         2.0    SITE DESCRIPTION                                            4

         2.1           Site Location                                        4

         2.2           Existing Land-use, Topography and Drainage           5

         2.3           Proposed Land-use                                    5
         3.0    FLOOD IMPACT ASSESSMENT                                     7

         3.1           Flood Modelling                                      7

         3.2           Hydrology                                            7

         3.3           Temporal Patterns and Rainfall Intensity             8

         3.4           Rainfall Durations                                   8

         3.5           Rainfall Losses                                      8

         3.6           Pre-Burst Rainfall                                   9

         3.7           Areal Reduction Factor                               9

         3.8           Manning`s Values                                     9

         3.9           Fraction Impervious                                 10

         3.10          Topography                                          10

         3.11          Grid Cell Size                                      11

         3.12          Tailwater Conditions                                11

         3.13          Hydraulic Structures                                11

         3.14          Developed Case Scenario                             14

         3.15          Results                                             15
                       3.15.1 Onsite Impacts                               15
                       3.15.2     Offsite Impacts                          16
         4.0    CONCLUSION                                                 19
         5.0    REFERENCES                                                 20




Flood Impact Assessment                                             Page 2 of 25
Project No 244035| Ref No M25-0479Rpt – Issue A – January 2026