Drainage Overview - Maricopa County Department of Transportation
Drainage Overview - Maricopa County Department of Transportation Drainage Overview - Maricopa County Department of Transportation
4. EXISTING HYDROLOGY Various hydrologic studies have been completed that together encompass the entire study area. These existing studies were not necessarily performed to the same level of detail. Some studies – typically those intended for planning purposes – focused on broad drainage trends, featuring large subbasins and a limited number of concentration points. On the other hand, studies intended for floodplain delineation purposes typically used small subbasins and a large number of concentration points. To present a consistent level of hydrologic analysis throughout this study, offsite flows were reported at each location where a regulatory 100-year floodplain or a USGS “blue line” stream crossed the study area centerline. Regulatory floodplains can be FEMA effective floodplains or 100-year floodplains that have been recognized and delineated by FCDMC. USGS “blue lines” refer to intermittent and perennial streams that are shown (in blue) on the commonly referenced USGS primary series quadrangle maps. Table 1 presents an overview of the offsite hydrology concentration points examined for this report. The location of each offsite drainage crossing is provided in Figure 6. 4.1 Summary of Hydrology Methods Existing hydrology data for the study area was extracted for each of the 19 offsite concentration points from the Wittmann Area Drainage Master Study Update Technical Data Notebook ADMSU Hydrology (FCDMC, 2004). Figure 6 shows subbasins within each watershed grouped by color. Concentration points in existing studies were used directly if located near the center of the study area. If a crossing was not near a published concentration point, the peak flow was calculated as the contributing area weighted portion of the next downstream published value. The methodology used in each existing study is summarized below. The watersheds are discussed from a west to east direction. 4.1.1 Sun Valley Watershed This watershed was subdivided into multiple general areas with similar characteristics. Area 4 is comprised of the area that drains directly to the Hassayampa River and encompasses the west end of the Deer Valley Parkway study area. The 100-year, 6-hour and 24-hour storm events for both existing and future land use conditions were modeled using HEC-1 software, in conjunction with methods and procedures described by FCDMC. Drainage Design Management System for Windows (DDMSW) software was utilized to prepare the input parameters for the HEC-1 models. National Oceanic and Atmospheric Administration (NOAA) Atlas 2 rainfall data was used to estimate the design rainfall depth for this study. Depth-area reduction factors were applied with the use of JD records. Rainfall distributions for the 6-hour storm were taken from the FCDMC Hydrology Manual. Soil Conservation Service (SCS) Type II precipitation distributions were used for 24-hour models. The Green and Ampt Method was utilized for the estimation of rainfall losses. The S-Graph method was used for the development of unit hydrographs. 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 19 April 2012
Crossing ID Table 1 – Significant Offsite Drainage Crossings Watercourse Name Nearest Cross Street Regulatory Floodplain USGS "Blue Line" 1 Wash 1 251st Ave Yes Yes 2 Wash 1 251st Ave Yes Yes 3 Wash 2 243rd Ave Yes Yes 4 Wash 1 243rd Ave Yes Yes 5 Wash 3 231st Ave Yes Yes 6 Wash 1 231st Ave Yes Yes 7 5 West Wash 231st Ave Yes Yes 8 5 West Wash 231st Ave Yes Yes 9 Wash 4 227th Ave Yes Yes 10 Wash 5 219th Ave Yes Yes 11 5 West Wash 219th Ave Yes Yes 12 Iona Wash (West Split) 211th Ave Yes Yes 13 Iona Wash 211th Ave Yes Yes 14a Trilby Wash 211th Ave Yes No 14b Trilby Wash 211th Ave Yes No 14c Trilby Wash 211th Ave Yes No 15 Unnamed Tributary to Trilby Wash 203rd Ave Yes No 16 2 West Wash 187th Ave Yes Yes 17 1 West Wash Citrus Rd No Yes 18 Unnamed Tributary to McMicken Dam Cotton Ln Yes Yes 19 4 East Wash US 60 Yes No 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 20 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 14 and 15: Two areas fall within Hydrologic So
- 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 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
- Page 64 and 65: Dixileta Dr Patton Rd Jomax Rd Happ
- Page 66 and 67: Photo 903: Bridge over 1 West Wash
- Page 68 and 69: Photo 906: Drainage channel upstrea
- Page 70 and 71: Photo 209: Iona Wash (West Split) l
Crossing<br />
ID<br />
Table 1 – Significant Offsite <strong>Drainage</strong> Crossings<br />
Watercourse Name<br />
Nearest Cross<br />
Street<br />
Regulatory<br />
Floodplain<br />
USGS<br />
"Blue<br />
Line"<br />
1 Wash 1 251st Ave Yes Yes<br />
2 Wash 1 251st Ave Yes Yes<br />
3 Wash 2 243rd Ave Yes Yes<br />
4 Wash 1 243rd Ave Yes Yes<br />
5 Wash 3 231st Ave Yes Yes<br />
6 Wash 1 231st Ave Yes Yes<br />
7 5 West Wash 231st Ave Yes Yes<br />
8 5 West Wash 231st Ave Yes Yes<br />
9 Wash 4 227th Ave Yes Yes<br />
10 Wash 5 219th Ave Yes Yes<br />
11 5 West Wash 219th Ave Yes Yes<br />
12 Iona Wash (West Split) 211th Ave Yes Yes<br />
13 Iona Wash 211th Ave Yes Yes<br />
14a Trilby Wash 211th Ave Yes No<br />
14b Trilby Wash 211th Ave Yes No<br />
14c Trilby Wash 211th Ave Yes No<br />
15 Unnamed Tributary to Trilby Wash 203rd Ave Yes No<br />
16 2 West Wash 187th Ave Yes Yes<br />
17 1 West Wash Citrus Rd No Yes<br />
18 Unnamed Tributary to McMicken Dam Cotton Ln Yes Yes<br />
19 4 East Wash US 60 Yes No<br />
091337137, 2011-018, TT005 <strong>Maricopa</strong> <strong>County</strong> <strong>Department</strong> <strong>of</strong> <strong>Transportation</strong><br />
Technical Memorandum 3 Deer Valley Parkway Feasibility Study<br />
<strong>Drainage</strong> <strong>Overview</strong> 20 April 2012
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