SUBWAY ENVIRONMENTAL SURVEY: CHICAGO TRANSIT AUTHORITY SYSTEM

THE ENVIRONMENTAL SURVEY OF THE CHICAGO TRANSIT AUTHORITY SUBWAY SYSTEM WAS UNDERTAKEN AS PART OF A LARGER INVESTIGATION TO DEVELOP COMPREHENSIVE SUBWAY ENVIRONMENTAL DESIGN CRITERIA AND FOCUSED UPON CONDITIONS PREVAILING AMONG THE MAJOR OPERATING PROPERTIES THROUGHOUT THE NATION. THE ENVIRONMENTAL CONTROL (VENTILATION) SYSTEM EMPLOYED IN CHICAGO SUBWAYS WAS DESIGNED ON THE BASIS OF FORMULATIONS DEVELOPED IN 1943 WHICH DID NOT ADEQUATELY COMPENSATE FOR HEAT SINK EFFECTS IN THE EARTH AND WATER TABLES SURROUNDING SUBWAY TUNNELS AND STATIONS, AND DID NOT CONSIDER EFFECTS CAUSED BY EVAPORATION OF GROUND WATER SEEPING INTO SUBWAY TUNNELS. THESE FACTORS MAY COMBINE TO LOWER THE AMBIENT TEMPERATURE AND INCREASE HUMIDITY IN UNDERGROUND TUNNEL SYSTEMS. WHILE THERMAL CONTROLS WERE NOT FOUND TO POSE SIGNIFICANT ENVIRONMENTAL PROBLEMS, IT IS CONCLUDED THAT A MAJOR DIFFICULTY INVOLVES NOISE. A SERIES OF EXPERIMENTS WERE CONDUCTED TO DEVELOP NOISE ABATEMENT TECHNIQUES, BUT NONE PROVED SUCCESSFUL. APPENDED MATERIAL INCLUDES: TRAFFIC DISTRIBUTION, AIR FLOW TEST MEASUREMENTS, PLATFORM AIR VELOCITY, SOIL AND WATER CONDITIONS, STATION TEMPERATURE DATA, HEAT STORAGE CAPACITY OF CONCRETE, SCHEMATIC DIAGRAMS OF TRANSIT ROUTES, COMPREHENSIVE VEHICLES PERFORMANCE DATA, STATION SPACING, AND A REPORT ON RAPID TRANSIT RAIL CAR NOISE. /UMTA/

  • Supplemental Notes:
    • PROJ NO DC-MTD-7
  • Corporate Authors:

    De Leuw, Cather and Company

    165 West Wacker Drive
    Chicago, IL  USA  60601
  • Publication Date: 1971-5

Subject/Index Terms

Filing Info

  • Accession Number: 00242070
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Nov 7 1972 12:00AM