Drainage Overview - Maricopa County Department of Transportation
Drainage Overview - Maricopa County Department of Transportation Drainage Overview - Maricopa County Department of Transportation
(PMF) events were also calculated for the future land use condition. SCS Type II rainfall distribution was used for the 24-hour storm. Subbasin boundaries were placed along the CAP canal alignment so that the effects of the structure could be included in the model, but most roadways, including US 60, State Route 74, and Sun Valley Parkway, were ignored. Rainfall losses were estimated using the Green and Ampt infiltration equation. The S-Graph method was found to be the most appropriate method developing unit hydrographs. Normal depth channel routing methodology was utilized in the hydrologic model to route surface runoff through subbasins. An eight-point composite channel cross-section was developed to represent typical wash cross-section conveyance. The longitudinal slopes and Manning’s “n” values were estimated based on topographic mapping, aerial photographs, and field reconnaissance estimates. Storage routing behind the CAP canal was modeled using level pool routing. Most flow splits were not considered important for the purposes of this model. One flow split upstream of the CAP and east of US 60 was included, which directs some flow into the study area and some flow away from the study area. 4.2 Offsite Hydrology Results Detailed hydrologic analysis was not performed as part of this study. The existing peak 100-year flows for each major wash crossing within the study area depicted in Figure 6 are listed in Table 2. The wash information presented previously is also included to provide a comprehensive summary of the offsite hydrology at each wash crossing. Table 2 indicates if the peak flow was taken directly from an existing study or if the discharge was calculated by combining peak flows of published values. Combined values are conservative as the peak flows generally do not occur at the same time. The concentration point or subbasin identification and storm duration used in each existing study are also presented. Excerpts from the original source documents of each respective hydrologic study are included in Appendix TM3-10. As stated previously, concentration points were located at USGS “blue lines” and 100-year floodplains. There is no discharge reported for Wash 4 (Crossing 9). Because of the distributary nature of the area, it is difficult to determine the area contributing to this wash. Trilby Wash (Crossing 14) has a published effective FEMA discharge that differs from the value reported in the Wittmann ADMSU. The peak flows presented for this crossing in Table 2 report both the effective FEMA discharge from the Flood Insurance Study (FIS) as well as the discharge from the Wittmann ADMSU. The effective FEMA discharges reported in the FIS for Trilby Wash are higher than those published in the Wittmann ADMSU. It should be noted that the drainage areas recorded in the FIS are also significantly larger than the drainage areas in the Wittmann ADMSU. 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 23 April 2012
Crossing ID Watercourse Name Nearest Cross Street Drainage Area Table 2 – Offsite Hydrology Results Regulatory Floodplain USGS "Blue Line" Calculation Method Existing Study Name Existing Study ID 091337137, 2011-018, TT005 Maricopa County Department of Transportation Technical Memorandum 3 Deer Valley Parkway Feasibility Study Drainage Overview 24 April 2012 Storm Duration Peak 100- Year Flow (mi 2 ) (cfs) 1 Wash 1 251st Ave 1.68 Yes Yes combined values Wittmann ADMSU SV218, RSV250, RSV251 6 1,548 2 Wash 1 251st Ave 1.68 Yes Yes published value Wittmann ADMSU CSV218 6 1,834 3 Wash 2 243rd Ave 2.82 Yes Yes combined values Wittmann ADMSU SV216, RSV244 6 3,155 4 Wash 1 243rd Ave 4.01 Yes Yes published value Wittmann ADMSU CSV216 6 2,753 5 Wash 3 231st Ave 6.82 Yes Yes combined values Wittmann ADMSU SV214, R242*, RSV236 6 5,393 6 Wash 1 231st Ave 6.22 Yes Yes combined values Wittmann ADMSU SV214, R242*, RSV237, RSV216 6 8,115 7 5 West Wash 231st Ave 13.04 Yes Yes combined values Wittmann ADMSU SV220, RSV260 6 6,038 8 5 West Wash 231st Ave 17.59 Yes Yes published value Wittmann ADMSU CSV220 24 7,844 9 Wash 4 227th Ave 30.63 Yes Yes N/A 1 N/A 1 N/A 1 N/A 1 N/A 1 10 Wash 5 219th Ave N/A Yes Yes published value Wittmann ADMSU R230* 6 3,271 11 5 West Wash 219th Ave 3.91 Yes Yes published value Wittmann ADMSU CSV212 24 8,859 12 Iona Wash (West Split) 211th Ave 38.68 Yes No published value Wittmann ADMSU SV202 6 1,323 13 Iona Wash 211th Ave 1.44 Yes No published value Wittmann ADMSU CIW300 24 7,056 14a Trilby Wash 219th Ave 67.16 Yes Yes published value FEMA FIS 14a Trilby Wash 219th Ave 103.94 Yes Yes published value FEMA FIS 150 ft downstream of Deer Valley Road (Extended) 500 ft downstream of Deer Valley Road (Extended) 14b Trilby Wash 211th Ave 24.18 Yes Yes published value Wittmann ADMSU CIW302 24 5,239 14c Trilby Wash 211th Ave 54.75 Yes Yes published value Wittmann ADMSU C302* 24 10,663 15 Unnamed Tributary to Trilby Wash 203rd Ave 2.87 No Yes published value Wittmann ADMSU CTW412 6 2,214 16 2 West Wash 187th Ave 28.02 Yes Yes combined values Wittmann ADMSU TW400, RTW422 6 5,680 17 1 West Wash Citrus Rd 35.84 Yes No published value Wittmann ADMSU CWI510 24 6,728 18 Unnamed Tributary to McMicken Dam Cotton Ln 43.47 No Yes combined values Wittmann ADMSU WI500, RD508 6 2,268 19 4 East Wash US 60 12.35 Yes Yes published value Wittmann ADMSU CWI506 24 2,956 1 No flows were determined specifically for this wash in the Wittmann ADMSU. Prorating the drainage area was not done because of the distributary nature of the area. Not Listed Not Listed 7,430 11,499
- 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 22 and 23: 4. EXISTING HYDROLOGY Various hydro
- Page 24 and 25: Figure 6 - Offsite Hydrology Workma
- 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 �������
- Page 38 and 39: Deer Valley �������
- Page 40 and 41: Deer Valley �������
- Page 42 and 43: Deer Valley �������
- Page 44 and 45: Deer Valley �������
- Page 46 and 47: Deer Valley �������
- Page 48 and 49: �� �� �� �� ��
- Page 50 and 51: Deer Valley �������
- 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
- Page 72 and 73: Photo 217: Desiccation cracks near
- Page 74 and 75: Photo 243: Scour near Wash 3 Photo
Crossing<br />
ID Watercourse Name<br />
Nearest Cross<br />
Street<br />
<strong>Drainage</strong><br />
Area<br />
Table 2 – Offsite Hydrology Results<br />
Regulatory<br />
Floodplain<br />
USGS "Blue<br />
Line" Calculation Method Existing Study Name Existing Study ID<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> 24 April 2012<br />
Storm<br />
Duration<br />
Peak 100-<br />
Year Flow<br />
(mi 2 ) (cfs)<br />
1 Wash 1 251st Ave 1.68 Yes Yes combined values Wittmann ADMSU<br />
SV218, RSV250,<br />
RSV251<br />
6 1,548<br />
2 Wash 1 251st Ave 1.68 Yes Yes published value Wittmann ADMSU CSV218 6 1,834<br />
3 Wash 2 243rd Ave 2.82 Yes Yes combined values Wittmann ADMSU SV216, RSV244 6 3,155<br />
4 Wash 1 243rd Ave 4.01 Yes Yes published value Wittmann ADMSU CSV216 6 2,753<br />
5 Wash 3 231st Ave 6.82 Yes Yes combined values Wittmann ADMSU SV214, R242*, RSV236 6 5,393<br />
6 Wash 1 231st Ave 6.22 Yes Yes combined values Wittmann ADMSU<br />
SV214, R242*,<br />
RSV237, RSV216<br />
6 8,115<br />
7 5 West Wash 231st Ave 13.04 Yes Yes combined values Wittmann ADMSU SV220, RSV260 6 6,038<br />
8 5 West Wash 231st Ave 17.59 Yes Yes published value Wittmann ADMSU CSV220 24 7,844<br />
9 Wash 4 227th Ave 30.63 Yes Yes N/A 1 N/A 1 N/A 1 N/A 1 N/A 1<br />
10 Wash 5 219th Ave N/A Yes Yes published value Wittmann ADMSU R230* 6 3,271<br />
11 5 West Wash 219th Ave 3.91 Yes Yes published value Wittmann ADMSU CSV212 24 8,859<br />
12 Iona Wash (West Split) 211th Ave 38.68 Yes No published value Wittmann ADMSU SV202 6 1,323<br />
13 Iona Wash 211th Ave 1.44 Yes No published value Wittmann ADMSU CIW300 24 7,056<br />
14a Trilby Wash 219th Ave 67.16 Yes Yes published value FEMA FIS<br />
14a Trilby Wash 219th Ave 103.94 Yes Yes published value FEMA FIS<br />
150 ft downstream <strong>of</strong><br />
Deer Valley Road<br />
(Extended)<br />
500 ft downstream <strong>of</strong><br />
Deer Valley Road<br />
(Extended)<br />
14b Trilby Wash 211th Ave 24.18 Yes Yes published value Wittmann ADMSU CIW302 24 5,239<br />
14c Trilby Wash 211th Ave 54.75 Yes Yes published value Wittmann ADMSU C302* 24 10,663<br />
15 Unnamed Tributary to Trilby Wash 203rd Ave 2.87 No Yes published value Wittmann ADMSU CTW412 6 2,214<br />
16 2 West Wash 187th Ave 28.02 Yes Yes combined values Wittmann ADMSU TW400, RTW422 6 5,680<br />
17 1 West Wash Citrus Rd 35.84 Yes No published value Wittmann ADMSU CWI510 24 6,728<br />
18 Unnamed Tributary to McMicken Dam Cotton Ln 43.47 No Yes combined values Wittmann ADMSU WI500, RD508 6 2,268<br />
19 4 East Wash US 60 12.35 Yes Yes published value Wittmann ADMSU CWI506 24 2,956<br />
1 No flows were determined specifically for this wash in the Wittmann ADMSU. Prorating the drainage area was not done because <strong>of</strong> the distributary nature <strong>of</strong> the area.<br />
Not<br />
Listed<br />
Not<br />
Listed<br />
7,430<br />
11,499
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