IV CONTENTS 
Page 
WAL, IW hay lorelay \yennere Ent ee hh! ey i ee Lo 79 
Variationsingheehtrormiehiwaters- ose snare en eer oy Ls ee ee 79 
Monthiyahightwaterssee onan re eee Sak iL a 82 
Yearly highawatertem ase see ecient Sew 2k er 83 
Definitiontofemeanvhightwater= so" see eos ae Se eos ee Lk eee 86 
Primaryadetermination= eer ee ee nae a 87 
Secondanvdeterminaliones: nna ean se Ses en eo =u SE 87 
Companisonvof simultaneous tobsenvatiouse. =-e eee. 92 2 oes ee eee 88 
Correction byatabulanaaluese nena ee es oe Seo Jeli 90 
SUMMA Try Seen ee aun iee at anager ERNE eee raat ed (So ei otis oe 95 
Vili Mean low waters2e ot Se eRe ea ee ee ee See OS ol 97 
Variationsjin-falliot low: waternses oe aa ee ee 97 
Monthlyslow watert22 255) Sees ae oem eee meee Nae Ges ok 101 
Yearly low: waters.) oes: 2a weer ee eee ee ee i 102 
Definition*of meanslow =waterss2s20 oe seer Sees pe ere ee A 104 
Primary determination sore. Soke ene Seen ie ee et ae 104 
Secondary, determination: 22222 a0 ee Woo ee eee iene Oo). es) 105 
TX Bower lows water se 22s 0S EN Ee ee wee eA TEN a We nee are er 107 
Defi Milos hea sie Lee 2s sh ees Teh eR eR Oh et ARE Tn 107 
Variations) soe it ois nk 28 Seige Ris See Mate tee ed Se ge ee eee ee ce ieee eee 107 
Monthlyjlower low. water. 30 2225528 50.050 2s eins pe a Sen a 108 
AY Carly MlOwer lo wow bere 0s ke SG cee ph oS na ey eee tee ape 2p Ba 11 
Defimitionsofe me amel Owiery] Ow) swe bere eee ee ee egy ee Alber. 113 
Primary determinations ceo) eee «nA pe Se ees ee ee ee ee ee 114 
Relation tovlow. waters 225304 hoeu soe ease Taw ies oe al eee 114 
Secondary determination! <2 So.52 (a) es ees ee ee 116 
Comparisom of simultaneous obsenvationse 22a) =) eee 2 1s ae ene eye ee eee 116 
Correction: by: tabular valuesi2 023 Sessa 555 51h eee ee ee ee 120 
Sumaimary sc 2a Pa Sy ee Ie ee on a 2 122 
Xi ihishenshigh:watersw es sso. los Ol ee ee ee oo ee Se 123 
Definitions:=.< 2.05 Bese Set ea he he 123 
InGlaiton uO JOM: lOw? WES eee see eos eee etoetolel ee 123 
Variations << sie Mabey 2 3 Pats bn ieee ee Dw Ln SRS OR en ee ee 123 
Definition of meanvhizher high waters22"2 289. 292) 3h ee wes eee 124 
Primary: determination]... 2-2-1 Saas oe eS eee ee ee ee 124 
Secondary determination! .sie_ 2 2855222 ee ee a ee 125 
Ns Other tidal datumsaet salen ce Uae Oe es ae se ee ee 127 
Principal datum planes 2.6L tone aE eee Oe ee ee 127 
Monthivelowest low nwatenes sos ooo cea te be tee ole Se a eee 127 
Datumsplanes trom harmonic const e ribsese ma meee ee ener se a ee ee 128 
Sorina lon WEN ee oo ee oe bee as eusee PURGE eee Lie Fe Os 129 
Indianstide:plane <a b ee ter eee lk Eee ee A ea ee eee, 130 
NiiChances in tidalidatumplancss: s9e ss ceases lye eee ro a 131 
Implications in assumption of constancy of tidal datums_---=-_-=2--__2____1_-____ 7 = 131 
Changes due to change in relative elevation of land to sea_-_-__--------_------------- 131 
Changes due to alteration of hydrographic featuress=—= 92) 22s s 2s 55S eee 132 
XG Hormsitor tabulations andicomputations= === sess e seen nl 135 
Standard forms 2 cans 2h ee eee eS SERS Ye eee ee Oe 135 
Tabulation formes sess .heih..5 aoe ee Ne ee 135 
Computation forms. jo 0s esa es ae ea ee 136 
Tid xe. Se ON Se OS Res, 2 ene meee ee eerie eR Ie SRR eek SN Le 141 
