Physicochemical survey and sampling
Flow measurement
Survey closed to water management stakeholders
Data processing and analysis
In situ physicochemical survey
We measure the following parameters directly in the field:
- Temperature
- Conductivity
- Turbidity
- pH
- Dissolved oxygen
We can carry out these measurements in rivers, in water bodies and sea.
In situ sampling for analysis in an approved laboratory
Some parameters can not be measured directly in the field. In this case, we take water samples in the field, which will then be analyzed by an approved laboratory. These samples are subject to strict standards, provided by the laboratory according to the targeted parameters. They are generally sent to the laboratory within 24 hours of samples.
The main parameters analyzed in the laboratory are:
- Organic matter (BOD5, COD)
- Suspended matter
- Total organic carbon
- Soluble salts
- Chlorophyll
- Nutrients (phosphate, ammonium, nitrate, nitrite, iron, copper, manganese, zinc, …)
- Toxic substances (heavy metals, hydrocarbons, pesticides, drugs, …)
Any other parameter not listed above can be analyzed on request.
We can carry out these measurements in rivers, in water bodies and sea.
Material: portable turbidimeter HACH, portable multimeter HACH (temperature, conductivity, pH and dissolved oxygen), sampling kit supplied by the laboratory (bottles, filters, stabilizing reagents and refrigeration equipment )
Flow measurement is carried out in shallow water with weak currents.
We offer different measurement methods depending on the flow conditions of watercourses:
- Volumetric method
Allows gauging of small water sources. - Tracer dilution method (non-intrusive)
Allows gauging in rough or difficult to access waterways with low flow (1m3 / s). For example a torrential river. - Velocity field exploration method (intrusive)
Allows gauging in medium-flow rivers
(0 to 6 m3/s), depending on the height – flow velocity relationship.
Height-flow velocity analysis to determine the risks for the hydrometer during a measurement operation by gauging (carried out with 43 measurements).
This figure is inspired from the hydrometry quality charter (see below).
Material: hydrometric currentmeter OTT MF PRO, decameter, 20L bucket.
The survey makes it possible to observe, assess and understand the anthropogenic influence on water resources in one or more watersheds.
Examples: survey on the water consumption of households in an urban area, survey on the quantitative management of water in times of drought, quantification and qualification of the volumes of water withdrawn from a watershed in order to deal with possible future water use conflicts, inventory of anthropogenic pressures on lagoons.
This step allows the formatting and interpretation of the data collected during the field missions.
Old unprocessed data may be provided for further analysis.
Examples: assessment report of the water quality of a watercourse (SEQ-EAU), calibration of the rainfall-flow model in a watershed, trophic balance of a lake.
Software used: R, Matlab, SIG, HEC-HMS, Microsoft Office.