. Annual report of the Metropolitan Water and Sewerage Board . 1900 1910 0 60 50 - 40 30 20 10. 0D a 70 O i—< OS 60 50 40 -?302010 1900 1910 1920 1930 1940 No. 57.] AND SEWERAGE BOARD. 185 Diagram No. 4.— Comparison of the Estimated Flow of Sewage and theCapacity of the Charles River Valley Sewer at Vancouver and BuggiesStreets, Back Bay, using Total Estimated Low-level Populations. 80 70 60 50 o3 40© fl 30o r_i •*« * 20 10

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