hydrometer Articles

  • A Comparison of Methods to Determine the Particle Size

    There currently exist a multitude of techniques to determine particle size distributions. However, in assessing the particle size distribution (PSD) of solids in a stormwater sample, the number of suitable techniques is considerably reduced due to the limited quantity of solids in a typical stormwater sample. The electrical sensing zone method (ESZ), which utilizes the Coulter Principle, and ...


  • Copper Electrolyte Purification Systems Expand

    The formula for success – for Eco-Tec’s Copper Electrolyte Purification Systems – has been to deliver a simple, economical system for purifying acid bleed streams. Now, this technology is being applied further by Eco-Tec to address additional contaminants involved in the production of high purity copper. These Electrolyte Purification Systems are based on the world-leading ...


    By Eco-Tec Inc.

  • Piedroba Dewaters Slurry, Returns Clean Water to Holmes Beach Canals

    This project was a successful application of a total cleaning system (TCS), where the particular type of solids of the sediments permitted the dredger to avoid the costly construction of a dredged material maintenance area (DMMA), or the transportation and tipping fees for a municipal landfill. The surface waters were cleaned in tandem, and contributed to a higher quality benthic environment in ...

  • OTT RLS Radar Level Sensors Help Optimize South Dakota TMDL Monitoring

    Non-contact OTT RLS Radar Level Sensors using accurate pulse radar technology are helping the South Dakota Department of Environment & Natural Resources more efficiently monitor water levels at current and future statewide Water Quality Monitoring ...

  • Monitoring of soil fertility

    Background In agriculture and forestry soil fertility is a decisive factor for the economic use of fields and forests. Various factors, considered as a whole are the indicators which characterize the soil fertility. Important parameters are e.g.: Intensity of precipitation, air temperature, air humidity, soil humidity, suction power and soil temperature in various depths. ...

  • Online measurement with OTT SLD and LogoSens2

    Background The drill called „Wallensteingraben“ connects the Lake of Schwerin with the Hanseatic city Wismar, ending in the Baltic Sea. The Wallensteingraben was originally constructed as channel and is almost 20 km long. In the context of implementing the European Water Framework Directive its ecological passability shall be improved. At the measurement site „Rothentor“ a weir system ...

  • GW monitoring in saxony

    Background During the hundred-year flood in 2002 in Eastern Germany the river “Elbe“ and a lot of rivers in the catchment area exceeded the banks and caused damages of millions within a short period of time. Often unnoticed, the groundwater level was rising extremely after a certain time. The time of rising groundwater took considerably longer than the actual flood, and caused enormous ...

  • Online flow measurement

    Background The undershoot weir in Hohensaaten was built in 1913. It has three openings and regulates the discharge from the Oderbruch and from the Finow canal into the Hohensaaten-Friedrichsthaler-waterway. Moreover, it protects parts of the Oderbruch against Oder floods. The weir controls the waterlevels in the Havel-Oder-waterway and in the reach of Niederfinow- Hohensaaten. ...

  • Radar measurement in the North Sea

    Background / Task The NLWKN operates the barrier in the inland waterway of the river Ems. They are working with a dense monitoringnetwork which is required e.g. for the preservation of evidence in case of blocks for the protection against storm tides or if the water depth has to be increased to make the Ems navigable for big vessels coming from the dockyard. After an average a new radar ...

  • Online discharge measurement with horizontal doppler-flow sensor

    Background The regional authority responsible for the barrages in the Free State of Saxony is in charge of the water management of the Rötha. Reservoir. This reservoir is situated close to the river Pleiße, from which the water is led over a weir into the reservoir.. Knowledge about the inflows of the reservoir is important for the water management there. So far, the ...

  • Water quality measurement extreme

    Background The characteristics of the Rio Tinto in the south-west of Spain, near Sevilla, are his ruby colour and the extremely sour pH-value between 0 and 2 pH-units. The river carries a mixture between poisonous heavy metals like copper, nickel, arsenic, iron and cadmium, dissolved in high-percent sulphuric acid. It’s not proved where these unusual conditions come from. As per current ...

  • Real-time data in the wild

    Background The South African water resource (DWAF) monitoring network belongs to one of the well organized and managed networks world-wide. Well prepared and maintained measurement sites & stations deliver the data base for the water management in the huge territory of South Africa. One main issue of the online data availability is the data transfer from remote stations to the data ...

  • Monitoring louisiana’s levees

    Background The natural disaster in New Orleans was exacerbated by the fact that the city’s levees broke Two towns SE of New Orleans, Braithwaite and Scarsdale, depend on levees which were also damaged by Hurricane Katrina Levees have been repaired to meet minimum protection requirements, and additional strengthening work continues Redirect water from behind ...

  • Waterquality in irrigation canals and boreholes - Greece

    Background Kavala is located in the North East of Greece, 680 km from the capital Athens. The population of the prefecture of Kavala is around 85,000 people. The River Nestos which flows through this prefecture is very important for the agriculture of the area. To allow for a fair distribution of the water for irrigation purposes, a number of Boreholes and canals have been established. The ...

  • Online discharge measurement with OTT SLD

    Background For the economic management of the waterways between Elbe and Oder it is essential to know the discharge of these rivers at defined locks. The authority for water and navigation (WSA) in Lauenburg operates hydrological stations for the measurement of water level and discharge to effectively regulate the water flow at the locks in Plau and Malliß ...

  • Waterquality and meteorological data - Greece

    Background Thesprotia is one of the 51 prefectures in Greece and is located in the North-West of the country, 479 km from the capital Athens. The population of the prefecture is around 46,000 people. In the Pindos-Mountains arises the riverKalamas and empties after 115 km in the bay of Valtos (Ionian Sea). The river has large environmental influence on the area and is also in some areas ...

  • OTT ADC measurement - Germany

    Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the ...

  • Monitoring of water node in wroclaw

    Background Wroclaw's water node has complicated structure. The river Odra has 3 main riverbeds and a lot of channels which are located in the centre of town. There are almost 100 hydro buildings which control flow of the water through the city and protect it against theflood. The great flood in 1997 proved that no one has control over it. Communication systems failure caused ...

  • DESWAT project in Romania

    Background Romania has a wide-area stream network which is of great importance for the drinking water supply of the population. In order to enable timely precautions for the protection of the drinking water supply and the ecosystem in case of limit values being exeeded, an early warning system is projected. In the past few years, Romania had to cope with massive flooding. Therefore the ...

  • Water quality in the Arosa Bay

    Background One of the great impediments to further development of shellfish aquaculture in the north-west region of Spain isa perception that industry expansion and tourism could have negative environmental effects on the coastal waters. Especially the bay around Villagarcia de Arosa is very famous because of its excellent areas for shellfish farming. The government of Spain is ...

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