NP122(2) Admiralty Tidal Handbook No.2, 1975

NP122(1) Admiralty Tide Handbook No. 1, 1985

NP122(3) Admiralty Tidal Handbook No.3, 1986

Reference: BANP1222

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*** Canceled, with no replacement on 8 Jun 2017

Admiralty Chart Catalogue		Admiralty Publications

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NP122(2) Admiralty Tidal Handbook No.2, 1975 - Datums For Hydrographic Surveys (And Other Related Subjects)

     This handbook is the second of a series published by the United Kingdom Hydrographic Office, dealing with various aspects of tidal work, both practical and theoretical.
     This volume is written mainly for hydrographic surveyors, engineers and others who may have practical problems in connection with the establishment of datums for survey work.
     Related subjects, such as levelling to tide gauges, cutting benchmarks, determination of Mean Sea Level etc. are also dealth with.
     This is the second edition of this handbook. The main alteration is the introduction of metric units. Some minor amendments have also been made.

Contents
Preface
	GENERAL DISCUSSION ON DATUMS-DEFINITIONS
Para
1	Sounding Datum and Chart Datum defined	1
2	Selection of a datum - general considerations	1
3	Recovering a former datum	2
	TRANSFER OF DATUM
4	General considerations	2
5	The Character of the tide; Criteria for Semi-diurnal and Diurnal tides	3
6	Transferring datum when tide is Semi-diurnal	5
7	Transferring datum when tide is Diurnal	7
8	Transferring datum by direct comparision of Low Water heights	12
	ESTABLISHING AN INDEPENDENT DATUM
9	Establishing datum by reference to the Land Levelling System	12
10	Establishing datum from Harmonic Constants	12
11	Establishing and recovering datum by reference to Mean Sea Level	13
12	Datums in rivers and estuaries - general considerations	16
13	Establishing datum up a river	17
14	River entrances - particular problems	17
15	Establishing datum where water is impounded	17
16	Establishing datum in non tidal waters	21
17	Datums in offshore waters; Use of Co-tidal Charts	21
18	Establishing datum for sketch surveys	25
19	Checking suitability of sounding datum	27
	CONNECTION OF DATUM TO THE LAND LEVELLING SYSTEM
20	General Remarks	27
21	The Land Levelling Systems in the British Isles	27
22	Other levelling systems	27
23	Establishing benchmarks	29
24	Types of Ordnance Survey benchmarks etc	29
25	Benchmark lists	29
26	Instructions for levelling; Levelling Errors; Accuracy required	32
	REPORTS AND RECORDS
27	Tidal Records - Descriptions of datums	32
28	Photographs of benchmarks, tide gauges, etc.	33
29	Bathmetric sheets and tracings - information concerning datums	33
30	Periodical reports and returns	33
	CHART DATUM ON THE PUBLISHED CHART
31	Larger scale Charts based on British Surveys	33
32	Smaller Scale Charts (Principally from British Surveys)	33
33	Charts of Foreign Waters	35
	MEAN SEA LEVEL
35	General discussion; Definition of symbols	35
35	Calculation of Mean Sea Level	36
36	Seasonal variations in Mean Sea Level	37
37	Mean Tide Level	38