Drainage Overview - Maricopa County Department of Transportation

TABLE OF CONTENTS
DRAINAGE OVERVIEW
1. INTRODUCTION .................................................................................................................................. 1
1.1 Background and Study Need ......................................................................................... 1
1.2 Study Area ...................................................................................................................... 2
1.3 Document Purpose and Scope ....................................................................................... 2
1.4 Design Drainage Criteria ............................................................................................... 2
2. EXISTING STUDIES AND OTHER DATA SOURCES ............................................................................. 4
2.1 Summary of Drainage Studies ...................................................................................... 4
2.2 Summary of Other Drainage Documents and Data .................................................... 6
3. WATERSHED FEATURES .................................................................................................................... 8
3.1 Topography and Geology .............................................................................................. 8
3.2 Soils .................................................................................................................................. 8
3.3 Existing and Future Land Use .................................................................................... 11
3.4 Flooding Hazards ......................................................................................................... 12
3.5 Potentially Impacted Existing Drainage Structures .................................................. 16
4. EXISTING HYDROLOGY ................................................................................................................... 19
4.1 Summary of Hydrology Methods ................................................................................ 19
4.2 Offsite Hydrology Results ............................................................................................ 23
5. SUMMARY AND CONCLUSIONS ........................................................................................................ 25
091337137, 2011-018, TT005 Maricopa County Department of Transportation
Technical Memorandum 3 Deer Valley Parkway Feasibility Study
Drainage Overview i April 2012