Special acknowledgment is made to the published
papers of Emil Kuichling, C.E., of Rochester, N. Y.,
for the chapters on Storm-water Discharge and Math-
ematical Formulse ; to the report of Dexter Brackett,
C.E., on the Future Water-supply of Boston, Mass. ;
to the thesis of Elon H. Hooker on Suspension of
Solids in Flowing Water ; to the Hering & Trautwine
Translation of Kutter for the chapter on Kutter's For-
mula, and for that on the Development of the other
and earlier Hydraulic Equations; to Hering's Report
to the National Board of Health for the chapter on
Lateral Location ; and to Baumeister for the general
arrangement of sewer systems.
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CONTENTS.
■ Preface.
List of I

List OF Tables

CHAPTER I.
GENERAL CONSIDERATIONS.
Development of Sewerage Systems; Col. Waring's Advocacy
of the " Separate System." Argumenis for Ihis System
as against the " Combined System." Conclusions

CHAPTER II.
PREPARATORV MAPS AND DATA.
Maps Required; ttieir Scale, Accuracy, and Extent; Informa-
tion Needed for Maps; Surveys, Metliods and Cost;
Soundings, Borings; Levels

CHAPTER in.
EXCESSIVE RAINS.
Brooklyn and Providence Studies; U. S. Weather Bureau

Records; Maximum Intensities; Kuichling's Studies;
Relation between Intensity and Duration; Talbot's Dia-
grams; Rochester Diagrams; Other Diagrams



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CHAPTER IV.
PROPORTION REACHING THE SEWERS.
Conditions Affecting thia Proportion; Early London Gagings;
Rochester Gagings; Sudbury River Gagings; European
Experience; Kuichling's Conclusions

CHAPTER V.
RELATION OF DENSITY TO PERCENTAGE.
Variety in Impervious Surfaces; Percentage of Rain Dis-
charged from Each; Amount of Impervious Surface Com-
pared with Density of Population; Density and Percent-
age of Rain Discharged Compared



CHAPTER VI.
MATHEMATICAL EORMULM.
Hawksley; Bflrkli-Ziegler; Adams; McMath; Analysis of
Factors Compared with those of N. Y. Diagrams; New
Orleans Diagram; Crane's Slide-rule; Dow's Diagram...
CHAPTER VII.
ESTIMATING FUTURE POPULATION.
