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IML <br />ponding on the center 50% of runways/taxiways during the 10-year event. Generally, <br />the proposed improvements exceed these requirements and are designed to keep <br />the 10-year storm event within ditch banks and limit the number of culverts <br />surcharging. <br />The 100-year storm event XPSWMM model results indicate that the improvements <br />lower the water levels and prevent water ponding on the two runways and most <br />buildings with the exception of hangar buildings in the southwest corner of the <br />airport. The ponding at the hangar buildings area is limited to a few inches as shown <br />in Figure 12. <br />FIGURE 12 - PONDING AT THE HANGAR BUILDINGS DURING 100-YR STORM EVENT <br />During the 10-year storm event, the proposed improvements contain flow within the <br />ditches. Though some overtopping occurs at the west side of the airport (along <br />Farrington Road), flooding conditions are improved (See Exhibit 12). During the 5- <br />year event flow is mostly contained within the roadside ditch along the western <br />drainage ditch. <br />Page 130 <br />