Drainage Overview - Maricopa County Department of Transportation

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Two areas fall within Hydrologic Soil Group D: soils with high runoff potential when thoroughly wet. One area is bounded by Citrus Road and US 60. The second area extends from 211 th Avenue to the western limits of the study area. This area is generally north of 5 West Wash. Water movement in these soils is restricted or very restricted. Soils in Group D typically have greater than 40 percent clay or the depth to a water impermeable layer (such as rock) is less than 20 inches. Descriptions of the hydrologic soil groups were taken from Chapter 7 of the NRCS National Engineering Handbook Part 630 Hydrology (2007). Contributing watersheds that contain Group D soils should be carefully analyzed when designing downstream structures or roadways since precipitation events may result in very quick runoff responses. Soils with low runoff potential (Hydrologic Soil Groups A and B) may generally have higher percolation rates than soils with high runoff potential (Hydrologic Soil Groups C and D). However, percolation rates can vary significantly depending on site specific conditions. Percolation tests should be obtained during final design. 3.3 Existing and Future Land Use Technical Memorandum 1 (TM 1) presents a discussion of land ownership, zoning, existing land use, future land use, existing and planned developments, and existing and future transportation networks. The land use descriptions below are abbreviated versions of the TM 1 descriptions that pertain to drainage design. 3.3.1 Existing Land Use The predominant existing land use within the study area is vacant land. There is a small rural low density residential area west of 219 th Avenue (Crozier Road). Industrial land uses include the Northwest Regional Landfill, located west of 195 th Avenue, and the Arizona Proving Ground, located east of 211 th Avenue. Desert Moon Elementary School, located on Pat Tillman Boulevard east of US 60 in the Asante master planned community, is the only school within the study area. Appendix TM3-05 provides photographs taken of the land uses and major drainage features in the study area. Existing residential land use 3.3.2 Future Land Use According to the Maricopa Association of Governments (MAG) general plan Geographic Information System (GIS) data provided by the Public Works Department of Maricopa County and City of Surprise, existing vacant land within the study area is anticipated to be converted to primarily residential land uses at buildout. The land in the vicinity of the Arizona Proving Ground and Northwest Regional Landfill is planned as a business park. There are also large areas of planned retail, mixed use, and open space. These future land 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 11 April 2012
use patterns incorporate the land use plans for the master planned communities in the study area vicinity. 3.4 Flooding Hazards 3.4.1 Regulatory Floodplains Floodplain and floodway delineations are based on the Flood Insurance Study, Maricopa County, Arizona and Incorporated Areas, FIS No. 04013CV001A (Federal Emergency Management Agency, 2005) and inundation limits provided by the FCDMC. The FCDMC is the floodplain administrator for this area. Detailed hydrology was submitted to FEMA for the washes in the study area, which resulted in a Best Available Data (BAD) letter from FEMA. The FCDMC calculations of corresponding floodplain delineations represent the best available data, but due to the alluvial nature of the area, detailed hydrology was not accepted by FEMA. Figure 5 provides a map of the 100-year floodplain areas and also displays the Flood Insurance Rate Map (FIRM) panels containing the effective floodplain mapping. Per discussions with FCDMC, both FEMA effective and FCDMC floodplain limits are shown on this exhibit to show the most conservative floodplain limits. Appendix TM3-10 provides separate exhibits showing the FEMA floodplain zone designations and the FCDMC floodplain zone designations. Numerous floodplains drain through the study area. Washes 1 through 4 drain north and east within the study area to 5 West Wash, which conveys flow southeast to Trilby Wash. Iona Wash and Iona Wash (West Split) also convey flow southeast through the study area to Trilby Wash. Trilby Wash, 2 West Wash, 1 West Wash and 4 East Wash drain southeast through the study area to McMicken Dam, which outlets northeast to the McMicken Outlet Channel and ultimately discharges to the Agua Fria River. The study area contains numerous regulatory floodplains, including thirteen named washes. Floodplain encroachment is a consideration for the parkway alternatives, especially when crossing wide floodplains such as Wash 1, Wash 2, Trilby Wash and Iona Wash. The 100year floodplain for Wash 1 is approximately 3,000 feet wide while the Wash 2 100-year floodplain ranges from approximately 500 to 1,200 feet wide. The 100-year floodplains for Trilby and Iona Washes merge south of the Deer Valley Road alignment. The combined floodplain width of these two washes is approximately 3,000 feet wide. North of the Deer Valley Road alignment, the 100-year floodplain widths for Trilby Wash and Iona Wash are both approximately 1,000 feet. Photos 201 and 205 in Appendix TM3-05 show the shallow, wide floodplains associated with Trilby Wash and Iona Wash. Crossing these wide floodplains while minimizing adverse impacts to the surrounding properties will be a challenge. Detailed hydraulic studies will be necessary during subsequent planning and design phases for the parkway. Trilby Wash floodplain 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 12 April 2012
Page 2 and 3: TABLE OF CONTENTS DRAINAGE OVERVIEW
Page 4 and 5: 1. INTRODUCTION The Deer Valley Par
Page 6 and 7: Figure 1 - Study Area 091337137, 20
Page 8 and 9: Figure 2 - Area Drainage Studies 09
Page 10 and 11: the portion of the study area withi
Page 12 and 13: Figure 3 - Topography 091337137, 20
Page 16 and 17: Figure 5 - Regulatory Floodplains 0
Page 18 and 19: channel slopes at the base of the W
Page 20 and 21: 3.5.2 Sun Valley Parkway The Draina
Page 22 and 23: 4. EXISTING HYDROLOGY Various hydro
Page 24 and 25: Figure 6 - Offsite Hydrology Workma
Page 26 and 27: (PMF) events were also calculated f
Page 28 and 29: 5. SUMMARY AND CONCLUSIONS The purp
Page 30 and 31: APPENDIX TM3-01 DATA COLLECTION SUM
Page 32 and 33: AZGS = Arizona Geological Survey AD
Page 34 and 35: AZGS = Arizona Geological Survey AD
Page 36 and 37: Deer Valley ��
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Page 60 and 61: APPENDIX TM3-04 SUBSIDENCE DOCUMENT
Page 62 and 63: 03/08/2004 To 09/13/2010 Subsidence
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Dixileta Dr Patton Rd Jomax Rd Happ
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Photo 903: Bridge over 1 West Wash
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Photo 906: Drainage channel upstrea
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Photo 209: Iona Wash (West Split) l
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Photo 217: Desiccation cracks near
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Photo 243: Scour near Wash 3 Photo
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APPENDIX TM3-06 EXISTING GEOLOGIC F
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Legend image from: White Tanks Moun
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16. Rapid and significant changes i
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SUN VALLEY PKWY Deer Valley ��
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APPENDIX TM3-09-2 EXISTING DRAINAGE
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Proposed End of Dam Segment Remove
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APPENDIX TM3-10-1 EXISTING HYDROLOG
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Table D.6: Summary of Peak Discharg
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Wittmann ADMSU Addendum 100-year 6-
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WITTMANN SUN VALLEY PARKWAY T5N T4N
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MARICOPA COUNTY, ARIZONA AND INCORP
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APPENDIX TM3-10-3 EXISTING HYDROLOG
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Dixileta Dr Patton Rd Jomax Rd Happ
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Drainage Overview - Maricopa County Department of Transportation

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