## Register: Measurement/observing method (terrestrial and hydrological)

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**URI:** http://codes.wmo.int/wmdr/ObservingMethodTerrestrial

Measurement/observing method (terrestrial and hydrological)

## Contents

Notation | Name | Description | Status |
---|---|---|---|

126 | Gravimetric moisture determination | Measurement of the amount of water in soil by weighing a samp... | stable |

128 | Soil heat flux plate | stable | |

159 | Neutron probe | Measurement of the moisture content and hence the porosity of... | stable |

187 | Electrical resistance blocks (Porous blocks) | Determination of electrical resistance between two electrodes... | stable |

194 | Soil thermometer | stable | |

200 | Tensiometer | Measurement of soil capillary tension by means of a porous cu... | stable |

203 | Time domain reflectometry (TDR) | Estimation of water content in unsaturated materials based on... | stable |

260 | Ultrasonic ranging | Transmission of an ultrasonic pulse towards the target and li... | stable |

261 | Graduated device | Manual measurement or observation made with a graduated fixed... | stable |

262 | Snow pillows and snow scales | Weighing of snow-cover mass per unit area. | stable |

344 | Laser ranging | Emission of a modulated beam of light in the visible spectrum... | stable |

345 | Echo sounding | Evaluation of the return time of acoustic waves emitted into ... | stable |

346 | Frequency domain reflectometry | Measurement of soil capacitance by means of radio frequency w... | stable |

347 | Gamma-ray attenuation | Determination of gamma-ray attenuation at given depth of soil... | stable |

348 | Non-recording gauge | Determination of water stage by means of a non-recording gaug... | stable |

349 | Staff gauge | Determination of water stage by means of a graduated vertical... | stable |

350 | Inclined gauge | Determination of water stage by means of a non-vertical scale... | stable |

351 | Wire-weight gauge | Determination of water stage by means of a fine cable or wire... | stable |

352 | Point gauge | Level measurement gauge, the essential element of which is a ... | stable |

353 | Maximum-stage gauge | Determination of the elevation of the flood crest by the adhe... | stable |

354 | Recording gauge | Determination of water stage by means of a recording gauge, f... | stable |

355 | Wire-float recording gauge (hydrograph) | Determination of water stage by means of a gauge consisting o... | stable |

356 | Pressure-actuated recording gauge | Recording gauge operating on the principle that static pressu... | stable |

357 | Velocity-area method | Method of determining the discharge of a stream by measuring ... | stable |

358 | Float gauging | Measurement of the velocity of a stream by means of timing th... | stable |

359 | Dilution gauging | Determination of the discharge of a stream by measuring the d... | stable |

360 | Slope-area method | Determination of the discharge in a reach which is based on t... | stable |

361 | Measuring weir | Determination of the discharge of a stream by means of a devi... | stable |

362 | Flume | Determination of the discharge of a stream by means of a man-... | stable |

363 | Stage-discharge relation | Determination of the discharge of a stream by means of a rela... | stable |

364 | Water current meter | Determination of water velocity by means of a current meter, ... | stable |

365 | Cup-type current meter | Determination of water velocity by means of a current meter w... | stable |

366 | Propeller-type current meter | Determination of water velocity by means of a current meter i... | stable |

367 | Acoustic (ultrasonic) velocity meter | Measurement of the difference in travel time of acoustic (ult... | stable |

368 | Acoustic doppler current profiler (ADCP) | An instrument that uses an acoustic doppler transducer to mea... | stable |

369 | Acoustic doppler current meter | Determination of stream velocity by means of an acoustic Dopp... | stable |

370 | Optical or nuclear suspended-sediment gauge | Determination of the decrease of intensity of a visible light... | stable |

371 | Gravimetric sediment measurement | Estimation of the total sediment in a water sample by allowin... | stable |

372 | Displacement method of sediments | Determination of sediment concentration by the measurement of... | stable |

373 | Water discharge-sediment discharge rating curve | An empirical relationship relating sediment discharge and str... | stable |

374 | Water discharge-bed material rating curve | An empirical relationship relating bed-material discharge and... | stable |

375 | Volumetric method | A process for measuring the discharge of a well, spring, or s... | stable |

376 | Electromagnetic current meter | Determination of water velocity based on the principle that a... | stable |

377 | Stream index-velocity rating | Computation of stream discharge based on a relation between s... | stable |

378 | Acoustic doppler velocity meter (ADVM) | Determination of water velocity by using the Doppler principl... | stable |

379 | radar water level gauge | A radar water level gauge transmits microwave energy to measu... | stable |

380 | radar velocimetry | Radar velocimetry or surface velocity radar (radar sensor) is... | stable |

381 | image velocimetry | The measurement of velocities at the free surface of a moving... | stable |

419 | Frequency domain reflectometry | Measurement of soil capacitance by means of radio frequency w... | stable |

420 | Gamma-ray attenuation | Determination of gamma-ray attenuation at given depth of soil... | stable |

421 | Non-recording gauge | Determination of water stage by means of a non-recording gaug... | stable |

422 | Staff gauge | Determination of water stage by means of a graduated vertical... | stable |

inapplicable | inapplicable | None of the codes in the table are applicable in the context ... | stable |

unknown | unknown | The measurement/observing method is unknown. | stable |