Showing results for: water level monitoring Articles
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Water Level Measurements-Part 1
Confused about which instrumentation to use in your water level monitoring system? In-Situ offers two categories of pressure sensors for water level measurements: absolute or non-vented sensors, and gauged or vented sensors. They look the same and both measure pressure and water level, but they have drastically different applications, outputs and accuracy. The absolute (or non-vented) water level ...
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Water Level Measurement Network Polder Monitoring Areas - Case Study
Project name Water Level Measurement Network Polder Monitoring Areas Client Rijnland District Water Control Board Country The Netherlands Background and aim project Chris van Vliet (team leader of Sample Taking at HHRS of Rijnland) explains why this project was carried out: “The most important aim of the project was to provide more insight into the polder levels. Up-to-date ...
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Measuring Static Water Levels Made Easier with Eno Scientific
The Well Sounder 2010 PRO is a sonic water level meter, designed and manufactured by Eno Scientific, to measure static water level in wells, piezometers or boreholes. This portable handheld unit uses sound waves to measure the distance from the top of the well to the water level. This eliminates the need to lower anything into the well. Unlike standard water level tapes these acoustic meters are ...
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3D modelling of the flow distribution in the delta of Lake Øyeren, Norway
A 3D numerical model was used to compute the discharge distribution in the channel branches of Lake Øyeren's delta in Norway. The model solved the Navier–Stokes equations with the k–ɛ turbulence model on a 3D unstructured grid. The bathymetry dataset for the modelling had to be combined from different data sources. The results for three different flow situations in 1996 and 1997 showed a relative ...
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Characterization of the hydraulic performance of a gully under drainage conditions
During rainfall events with low return periods (1–20 years) the drainage system can provide some degree of protection to urban areas. The system design is based not only on good hydraulic performance of the surface and the sewer network but also on their linking elements. Although the linking elements are of utmost importance as they allow the exchange of flow between the surface and the ...
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Harris county flood warning system - Case study
The Harris County Flood Control District in Texas was created in 1937 as a response to the devastating floods that struck the region between 1929 and 1935. The District's boundaries protect 3.7 million people and include the city of Houston. Twenty-two different watersheds are included in the district's boundaries, each with a unique set of monitoring challenges. The District is using the "Flood ...
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Water balance between surface water and groundwater in the withdrawal process: a case study of the Osceola watershed
A generalized hierarchical approach with a water balance function is introduced to simulate stream-flow depletion in a complex groundwater system in Osceola County. The groundwater flow system at the site, because of the complex interaction between ambient streams, exhibits a unique multi-scale pattern that proves to be difficult to simulate using standard modelling tools. The hierarchical ...
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Oakbank engineering report case study
Tadeusz Smoter, Professional Engineer registered in the Province of Manitoba, 31 Nikki Lane, Winnipeg, MB R2V 4M3, Canada, have examined the results and all relevant information dealing with a biological treatment done by Nordevco Associates Ltd. of the accumulated sludge in the primary cells of the Oakbank lagoon system in the Rural Municipality of Springfield in the Province of Manitoba. ...
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An operational approach to real-time dynamic measurement of discharge
Based on the maximization of entropy, microwave sensors are becoming standard approaches for converting point surface velocity measurements into discharge. Unfortunately, this conversion is conditioned by cross-section regularity and by the need to take the surface measures above the vertical where the maximum velocity occurs. Cross-section irregularities and the presence of floodplains, ...
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Estimation of combined sewer overflow discharge: a software sensor approach based on local water level measurements
Combined sewer overflow (CSO) structures are constructed to effectively discharge excess water during heavy rainfall, to protect the urban drainage system from hydraulic overload. Consequently, most CSO structures are not constructed according to basic hydraulic principles for ideal measurement weirs. It can, therefore, be a challenge to quantify the discharges from CSOs. Quantification of ...
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Lake water levels for calibration of the S-HYPE model
Lake water levels are easy to measure, and can be seen as a transformation of discharge. Water level measurements from 42 lakes in Sweden were analysed, and eight of these lakes were modelled using the Swedish S-HYPE model. The objective was to test if a hydrological model can be calibrated using water level data instead of discharge. A semi-analytical lake routing was developed to resolve ...
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Tidal influences on unconfined water levels in wells.
Tidal effects have the potential to measurably affect water level measurements and the estimation of groundwater flow direction and gradient. This has significant implications for the prediction and monitoring of contaminant plumes in coastal areas. Studies were conducted at two near-coastal sites in San Diego County, California, to evaluate the impact of tidal variability on the interpretation ...
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Case study - Continuous discharge monitoring in Mecklenburg - Germany
The Wallensteingraben was originally constructed as a channel and is almost 20 km long. In the context of implementing the European Water Framework Directive, goals include improving ecological passability. At the same time a measurement site for the continuous monitoring of discharge quantities was installed. Products used include OTT SLD, OTT CBS and OTT LogoSens. Monitoring Solution ...
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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 was ...
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Flood Monitoring with Radar Water Level Sensor
Application Problem: For a flood monitoring application, the customer required a solution to accurately monitor the level of a river, and be able to measure the river’s dry bed conditions. Application History: Solutions from several level sensor brands couldn’t detect the river’s dry bottom conditions, making them unsuitable for the application. Solution: ABM’s ...
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3 Reasons the Series PT-510 Excels in Well Water Measurement
In February we introduced our newest submersible pressure transducer, the Series PT-510. The Series PT-510 is an OEM-ready submersible transducer, with a maximum depth of 46 feet. Today, let’s look at three specific advantages of using the PT-510 in well water measurement. The size of the PT-510 is its first advantage in well water measurement. At less than an inch (0.9” / 21.9 mm) ...
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GWPD 4—Measuring water levels by use of an electric tape
VERSION: 2010.1 PURPOSE: To measure the depth to the water surface below land-surface datum using the electric tape method. Materials and Instruments An electric tape, double-wired and graduated in feet, tenths and hundredths of feet. Electric tapes commonly are mounted on a hand-cranked and powered supply reel that contains space for the batteries and some device (“indicator”) ...
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A WebGIS-based flood control management system for small reservoirs: a case study in the lower reaches of the Yangtze River
Small reservoirs are important to flood control and water resource utilization in local areas. This study proposes a WebGIS-based flood control management system to support the flood discharge of small reservoirs during intensive rainfall in the flood season. The agile software development method and a loosely coupled structure are used to combine multidisciplinary knowledge from different ...
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Flood water protection in the city of Buenos Aires - Case study
The Arroyo Mendrano is the second largest channeled stream of water running through Buenos Aires. In case of heavy rainfalls it overflows its banks and causes considerable material damage. When the retention basin which had been especially built to collect large quantities of water during strong precipitation events also overflowed, the government decided to have an alarm-system installed to ...
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River level monitoring lowers bridge scour risk
Engineers at Transport Scotland have investigated the potential for water level monitoring systems to help mitigate risks where transport infrastructure interacts with moving water. The trial was conducted at a bridge over Vales Burn near Hawick in Scotland, and the monitoring equipment was provided by OTT HydroMet. Climate change is increasing the frequency and severity of extreme weather ...
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