Winter Design Storm Factor Determination for Airports (2012) / Chapter Skim
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Pages 21-44
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21 This section presents five cases that illustrate the application of the guidance presented in Section 3 to different deicing management program situations requiring definition of a winter design storm event. 4.1 Baltimore/Washington International Thurgood Marshall Airport (BWI/Marshall)
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22 occurs at Piers A, B, and C Gate defrosting may also occur at any gate.
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23 Defining Duration of Design Condition (Multiday Storm or Isolated Event) The design storm for this project is actually different for different deicing collection system components.
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24 Note: RON = remain overnight. Figure 4-1.
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25 At CMH, aircraft are deiced primarily on the terminal apron around Concourses A, B, and C and on the east remainovernight apron. Storm water runoff from these deicing areas drains to Outfall 6, east of Sawyer Road and just south of the intersection of Sawyer Road and Bridgeway Road, eventually flowing to Big Walnut Creek.
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26 develop a collection and storage system with a deicer-runoff disposal rate to ensure that deicing tanks are empty after 24 hours of metered disposal to the local POTW or within 7 days for back-to-back events. Assessing Existing Performance Relative to Target Levels Pre-project deicing procedures did not include any provisions for collecting and disposing of deicer-laden runoff; therefore, the pre-project system did not meet the target levels.
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27 historical period of record. The 2006 flight schedule was used as the basis for simulating the runoff collected for 57 seasons of complete seasonal historical weather data (Gresham, Smith and Partners, 2009)
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28 for determining the appropriate design storm, depending on the component of the deicing system being designed: (1) the multiday storm path was used for the deicing runoff storage tank design in order to capture multiday or back-to-back storm events, and (2)
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29 4.3.1 Airport Overview/Project Definition IAD is operated by the Metropolitan Washington Airports Authority (MWAA)
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30 IAD experiences average annual temperatures of 55.3°F (1981–2000)
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31 total phosphorus concentrations by 50%. (The assumed water quality values were based on BOD concentrations measured in storm water samples collected from various locations at the airport.)
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32 Oxygen demand is, in turn, a function of water quality (NH4, N, and BOD) and flow rate.
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33 Figure 4-3. Washington Dulles International Airport.
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34 The coldest month of the year in Pittsburgh is January, when the 24-hour average temperature is 27.5°F (-2.5°C) , and subzero lows (below -18°C)
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35 October 1 through May 31. Though Pittsburgh rarely receives snow in October or May, October marks the beginning of freezing temperatures that require defrosting of aircraft that have been parked overnight on the terminal apron.
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36 Target Level of Service The target level of service has been defined as not exceeding the capacity of the collection and treatment system more than five times per year. In addition, in-stream dissolved oxygen standards must be maintained 99% of the time, as required by PA Title 25 Chapter 96.3(c)
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37 Summary of the Decision Support Process Results The decision support process was applied to the ACAA MBBR treatment system's design approach, as shown in Figure 4-4. The path taken is mapped using the arrows, and the decisions made are explained in the following.
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38 Figure 4-4. (Continued)
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39 • Is a robust risk analysis needed? Decision = Yes.
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40 deicing storm water runoff to the Columbia Slough and to the City of Portland sanitary system. The system includes the use of GRVs that capture concentrated runoff from aircraft deicing and anti-icing operations.
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41 Defining Duration of Design Condition (Multiday Storm or Isolated Event) The permit requirement of a 5-year recurrence interval for system upsets required a multiday storm approach.
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42 Figure 4-5. Portland International Airport.
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43 Figure 4-5. (Continued)
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44 • Is deicer load or concentration an issue? Decision = Yes.
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