. Public health manual . ight angle if but one, andin the other angles if more than one. The elevationsof all sewer inverts must be shown at street intersec-tions, at the ends of all lines, and at all points wherechanges in alignment and grade occur. These elevationsmust be clearly and distinctly written close to the man-hole or flush tank, parallel with sewer line, and ex-pressed at least to the nearest 1/10 foot. All manholes,flush tanks, catch basins, lampholes and other appur-tenances must be shown upon the plans in suitablesymbols appropriately • referenced in the title. Thesizes and the
. Public health manual . ight angle if but one, andin the other angles if more than one. The elevationsof all sewer inverts must be shown at street intersec-tions, at the ends of all lines, and at all points wherechanges in alignment and grade occur. These elevationsmust be clearly and distinctly written close to the man-hole or flush tank, parallel with sewer line, and ex-pressed at least to the nearest 1/10 foot. All manholes,flush tanks, catch basins, lampholes and other appur-tenances must be shown upon the plans in suitablesymbols appropriately • referenced in the title. Thesizes and the gradients of all proposed sewers, and ofexisting sewers, must be marked appropriately alongsewer lines between all consecutive manholes or flushtanks, with arrows showing the direction of flow. Allsewers and other appurtenances must be shown byblack lines and conventional signs, and not by an example of the lettering to be used at a streetintersection, the following sketch is offered: 102 PUBLIC HEALTH MANUAL. SE^-ZEAGE SYSTEMS 103 3. Profiles.— Profiles upon separate steets, showing allsewers 12 inches or more in diameter,, and all mainintercepting and outfall sewers when less than 12inches in diameter, and all other arailable profiles,must be submitted with the plans. Upon these pro-files must be shown all manholes, flush tanks, invertedsiphons and other appurtenances. The horizontal scaleof these profiles must be at least as great as the scaleof the corresponding plans, and the rertical scales notless than 10 feet to one inch. Both scales must beclearly shown upon the profiles. Figures showing thesizes and gradients of sewers, the surface elevationsand sewer inverts, must be shown upon the profileswith the same frequency, or at the same points, asshown upon the plans. All stream crossings and seweroutlets must be shown upon profiles with elevations ofstream bed, and. the normal, high and low water levels,if these data are available. 4. Detail plans.— Ia) Deta
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