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IML <br />Table of Contents <br />Tableof Contents....................................................................................................................1 <br />1. <br />Purpose and Need..........................................................................................................3 <br />2. <br />Criteria............................................................................................................................ <br />3 <br />3. <br />Existing Conditions......................................................................................................... <br />8 <br />4. <br />Rehabilitation Design....................................................................................................21 <br />5. <br />Affected Facilities not in this Project.............................................................................31 <br />6. <br />Conclusions and Recommendations............................................................................32 <br />7. <br />Schedule.......................................................................................................................34 <br />8. <br />Cost Estimates.............................................................................................................34 <br />9. <br />Modifications to Standards...........................................................................................35 <br />Figure 1 <br />- Taxiway Design Groups...............................................................................................6 <br />Figure2 <br />- Runway 12/30...............................................................................................................9 <br />Figure 3 <br />- Taxiway A Looking Southeast....................................................................................10 <br />Figure4 <br />- Runway 5 Markings....................................................................................................12 <br />Figure 5 <br />- Apron 2 Block Cracking..............................................................................................13 <br />Figure 6 <br />- Pipelines at the Airport...............................................................................................17 <br />Figure 7 <br />- XPSWMM Model Layout............................................................................................20 <br />Figure 8 <br />- Linear Detention Geometry ........................................................................................26 <br />Figure 9 <br />— Widened Ditch Geometry ...........................................................................................27 <br />Figure 10 - Widened Ditch Geometry along Farrington Road....................................................27 <br />Figure 11 - Altered Catchment Areas.........................................................................................29 <br />Figure 12 - Ponding at the Hangar Buildings During 100-yr Storm Event...................................30 <br />Figure 13 - Potential Pipeline Conflicts....................................................................................... <br />32 <br />Table 1 - <br />Rainfall Intensity Coefficients.........................................................................................7 <br />Table 2 - <br />Manning's n Values......................................................................................................14 <br />Table 3 - <br />Harris County Hydrologic Region 3 Rainfall (inches)...................................................17 <br />Table 4 - <br />Harris County Hydrologic Region 3 Loss Parameters.................................................18 <br />Table 5 - <br />Proposed Changes to Drainage Structures.................................................................28 <br />Table 6 <br />— Project Estimate of Probable Construction Cost ......................................................... <br />34 <br />List of Exhibits <br />1. Airport Layout <br />2. Pavement Distress Inventory <br />3. Effective Floodplain Maps <br />4. Drainage Structures <br />5. Existing Drainage Ditches <br />6. Existing Drainage System 5-year Inundation <br />7. Existing Drainage System 10-year Inundation <br />8. Existing Drainage System 100-year Inundation <br />9. Proposed Pavement Improvements <br />Page 11 <br />