CONTENTS. 



PAGES 



General introduction 1-4 



Data used and acknowledgments 4-5 



Methods of this investigation 6-8 



Outcome of the investigation 8-9 



Order of presentation 9-10 



Theoretical basis for barometric-observation equations 10-12 



Barometric effects in terms of barometric pressures 12-15 



Expression of barometric gradients 15-16 



Proportionality factors for barometric effects 16-18 



Form of observation equations for barometric effects 18-20 



Lag in barometric effects 20-23 



Values of C w and C n 23 



Assumed uniform change in barometric gradient 23-24 



Example of observation equations for barometric effect 24-26 



Barometric terms in observation equations 26-27 



Corrected change of elevation used in observation equations 28-29 



Example of normal equations for barometric effects 29-30 



Example of substitution in observation equations for barometric effects. . . 30-31 



The five final solutions for barometric effects 31-32 



Computation of hourly barometric effects 32-36 



Computation of daily barometric effects 36-39 



Theoretical basis for wind observation equations 39-40 



Relation between depth and slope produced by wind 40-43 



Derivation of S x 43-44 



Example of computation of 2 X 44-48 



Determination of position of nodal line 48-51 



Positions of various nodal lines 51-52 



Values of 2 X 52-54 



The wind exponent 54-55 



Example of observation equations for wind effects 55-61 



Examples of normal equations for wind effects 61 



The four final wind solutions 61-63 



Computation of wind effects 63-64 



Accuracy of computed barometric effects 64-65 



The rejection rule 65-66 



Rule for combining observation equations 66-67 



Discrepancies between pairs of values 67-69 



Study of proportionality factors 69-72 



Conclusions on accuracy of computed barometric effects 72 



Accuracy of computed wind effects 72-77 



Accuracy of corrected elevations of water surface 78-79 



Mean elevations of Lake Erie 79-100 



Observed and corrected daily elevations at Buffalo 80-83 



Observed and corrected daily elevations at Cleveland 84-87 



Observed and corrected daily elevations at Milwaukee 88-90 



Observed and corrected daily elevations at Harbor Beach 91-93 



Observed and corrected daily elevations at Mackinaw 94-96 



iii 





