Instructions for the installation of automatic hydro-meteorological measuring devices in Vietnam

Instructions for the installation of automatic hydro-meteorological measuring devices in Vietnam (Internet image) 

Regarding this issue, LawNet would like to answer as follows:

1. Requirements for the installation of automatic hydro-meteorological measuring devices in Vietnam

- Automatic hydro-meteorological measuring devices must be inspected and calibrated before being put into use; The inspection and calibration of automatic hydro-meteorological measuring devices comply with the provisions of Article 19 of the Law on Hydrometeorology 2015;

- Measuring instruments and auxiliary equipment for automatic hydro-meteorological stations belonging to the national hydro-meteorological station network must have characteristics and technical specifications according to the provisions in Appendix I of Circular 29/2023/TT-BTNMT and be maintained stable throughout the use process;

- Observation towers (columns) to install automatic hydro-meteorological measuring devices must be vertical, sturdy, and able to withstand all wind levels; The installation of measuring equipment must comply with the manufacturer's instructions, professional technical standards, ensure solidity and stability, and not be affected by surrounding shielding objects.

(Clause 1 of Article 5 of Circular 29/2023/TT-BTNMT)

2. Instructions for installing automatic hydro-meteorological measuring devices in Vietnam

(i) Install automatic hydro-meteorological measuring devices at stations belonging to the national hydro-meteorological station network:

- Automatic surface meteorological station:

The wind speed and direction sensor is installed on the monitoring tower (column) at a height of 10 meters to 12 meters above the ground surface; The sensor's North direction must coincide with the true North direction;

The sensor for measuring air temperature and air humidity is installed on the monitoring tower (column) at a height of 1.4 to 1.5 meters above the ground surface, ensuring that it is not directly affected by rain or sunlight;

The atmospheric pressure sensor is installed on the monitoring tower (column) at a minimum height of 1.5 meters above the ground surface. The location of the barometric pressure sensor must be referenced to the national absolute altitude;

The rain measuring sensor is installed on an arm with a length of 0.7 to 1.0 meters attached to the monitoring tower (column); The rainwater catchment mouth must be horizontal and at least 1.5 meters above the ground surface;

Ground temperature sensors are placed on the ground surface; The sensor measures the temperature of deep soil layers located at depths: 05 centimeters, 10 centimeters, 15 centimeters, and 20 centimeters above the soil surface and ensures the sensor is in good contact with the soil layers;

The sensor for measuring sunshine time is installed on the monitoring tower (column) at a minimum height of 1.5 meters above the ground surface; the sensor axis is placed in the North - South direction; the angle between the sensor axis and the horizontal plane must be equal to the latitude value where the sensor is located; Make sure not to be shaded from the sun during the day;

The distance measuring sensor is installed on a monitoring tower (column), at a height of 1.5 to 2.0 meters above the ground surface, ensuring it is not affected by shielding objects within the sensor's operating range;

The evaporation measuring sensor is connected to the evaporation measuring pot through a plastic or stainless steel pipe to guide water. The evaporation measuring pot must be placed horizontally, and the distance from the mouth to the soil surface is 27 centimeters;

- High altitude meteorological station:

Follow the regulations in Part 2 of the National Technical Regulations on Meteorological Observation QCVN 46:2022/BTNMT issued in Circular 14/2022/TT-BTNMT promulgating National Technical Regulations on Meteorological Observation ;

- Weather radar and ozone - ultraviolet radiation:

Comply with the provisions of Circular 14/2022/TT-BTNMT technical regulations on weather radar monitoring and ozone - ultraviolet radiation;

- Automatic hydrological station:

Water level sensor: For measuring sensors not in contact with water, they must be fixed at a position at least 1.0 meters higher than the highest water level that appears; For water contact measuring sensors, they must be permanently mounted at a location lower than the lowest historical water level that has occurred, at least 20 centimeters, and not be filled with sand and mud; The reference mark to determine the water level must refer to the national absolute height;

Water flow measurement sensor: A water contact measurement sensor is securely installed on ships, boats, canoes, or structures, ensuring monitoring of the water flow of the entire river cross section at water levels; The non-water contact measuring sensor is fixed at a position at least 1.0 meters above the highest water level that has appeared;

Sensor to measure suspended matter content: Depending on the features and measuring principles of each type of suspended matter content measuring device, install the sensor according to the user instructions and professional requirements;

- Automatic oceanographic station:

The sensor measures wind direction and speed as prescribed for automatic surface meteorological stations;

Sea level measuring sensor: For measuring sensors not in contact with water, they must be fixed at a position at least 1.0 meter higher than the highest wave height that has occurred; For water contact measuring sensors, they must be installed at a location at least 20 centimeters lower than the historical lowest water level and not covered by sand; The reference point to determine sea level must be referenced to the national absolute height;

The sensor for measuring ocean waves in contact with water must be securely installed at a depth 3 times the maximum wave height at the measurement location;

The sensor for measuring sea water temperature and sea water salinity must be installed or permanently mounted on the structure at a height at least 50 centimeters lower than the lowest water level;

- Automatic rain measuring station: The rain measuring sensor is installed on the monitoring column, and the rainwater mouth is guaranteed to be placed horizontally and at least 1.5 meters from the ground surface;

- Lightning location station according to technical regulations on thunderstorm and lightning monitoring;

- Automatic radiation station: The sensor is installed at a minimum height of 0.6 meters above the ground surface;

- Automatic salinity measuring station: Install measuring devices according to the instructions for use of each type of measuring device;

- Automatic reference meteorological station, automatic reference hydrographic station, automatic reference oceanographic station: Follow the regulations of the surface meteorological, hydrological, and oceanographic stations selected as reference stations.

(ii) The automatic hydrometeorological station of the project must monitor hydrometeorology as prescribed in Clause 1 of Article 1 of Decree 48/2020/ND-CP:

Based on the purpose and need to use information, hydro-meteorological data, and the characteristics and properties of the project, select appropriate techniques for installing measuring instruments and ensure technical corridors; the provisions in (i) may apply.

>> CLICK HERE TO READ THIS ARTICLE IN VIETNAMESE