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COURSE COORDINATOR: DR. J. O. ADEJUWON OFFICE LOCATION: ROOM B203, COLERM BUILDING OTHER LECTURERS: DR. GRACE O. OLUWASANYA.

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Presentation on theme: "COURSE COORDINATOR: DR. J. O. ADEJUWON OFFICE LOCATION: ROOM B203, COLERM BUILDING OTHER LECTURERS: DR. GRACE O. OLUWASANYA."— Presentation transcript:

1 COURSE COORDINATOR: DR. J. O. ADEJUWON OFFICE LOCATION: ROOM B203, COLERM BUILDING OTHER LECTURERS: DR. GRACE O. OLUWASANYA COURSE CODE: WMA 413 COURSE TITLE:HYDRO-METEOROLOGICAL INSTRUMENTATION AND NETWORK DESIGN II NUMBER OF UNITS: 2 COURSE DURATION: TWO HOURS PER WEEK

2 Course Contents Water levels of rivers, lakes and reservoirs, Gauges and procedures for measurement of state. Frequency of gauge measurements. Discharge measurements: by current meter, float method, dilution method. Measurement of correspondence stage by moving boat method, Ultrasonic method, Electromagnetic method, Stream gauging stations. Purpose: selection of sites, control sections, Artificial controls, stage discharge relationships. Stream flow computation, computation of average gauges height, computation of average discharge, Quality control of stream flow data. Sediment discharge: Measurement of suspended sediment discharge, Measurement of bed-sediment discharge. Collection, processing and publication of data. Collection and observation procedures. Transmission of hydrological and meteorological observations. Quality control, storage and cataloging. Special data collection requirement: `bucket surveys`` of storm rainfall, weather radar data. Extreme stages and discharges. Pre-requisite: WMA 313.

3 Course Requirements This is a compulsory course for students in the Department of Water Resources Management and Agrometeorology and the student must have passed WMA 313 before taking this course. As a school regulation, a minimum of 75% attendance is required of the students to enable him/her write the final examination

4 Reading Lists Ayoade, 2003: Tropical Hydrology and Water Resources, MacMillan, Nigeria, 276pp A Textbook of hydrology and Water Resources

5 River Gauging 1.1 Introduction What is gauging? What is stream flow? What constitute stream flow? Stream flow measurement The common terms in stream flow measurement River or stream gauging; Hydrometry Water level/stage Discharge measurement Water level measurement Measurement of stream velocity Computation of discharge Stream gauging stations Site selection criteria

6 River Gauging 1.2Stage measurement Water levels of rivers, lakes and reservoirs Stage measuring instruments Staff gauges Manually operated weight/electric sensors Float operated stage gauges Depth sensors Procedures for stage measurement Frequency of stage measurements 1.3 Discharge measurement Velocity – Area method Control structures Dilution gauging

7 River Gauging 1.3.1Velocity – Area method Determination of cross-sectional area of stream Measuring velocity of flow Surface floats Current meters Types of meters Operational procedure Discharge computation Mean-section method Mid-section method Empirical equations Manning's’ formula Chezy’s formula

8 River Gauging 1.3.2The use of control structures Weirs ---Sharp crested ---Broad crested Flumes 1.3.3Dilution gauging or tracer method Types of dilution gauging Constant rate injection method Integration or gulp method Characteristics of chemicals/tracers Examples of chemical used as tracers Condition for use of dilution gauging

9 River Gauging 1.4 The use of control structures Weirs ---Sharp crested ---Broad crested Flumes 1.5Stage –Discharge relationship Flow rating curve The rating equation Rating table

10 Sediment Discharge  Measurement of sediment discharge  Suspended sediment discharge  Bed sediment discharge

11 Collection, processing and publication of data  Collection and observation procedures  Transmission of hydrological and meteorological observations  Quality control  Storage and cataloguing  Special data collection requirements  ‘Bucket surveys’ of storm rainfall  Weather radar data  Extreme stages and discharges


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