RESOURCE CENTER
With over 50 years in business, C.C. Lynch, Inc. has had the opportunity to work with customers on various unique and interesting projects, many of which result in the publication of professional papers, technical guidance, or the posting of live data. We have assembled a list of helpful documents on this page for you to utilize as a resource on your next project. Just click on any link within the subject headings below to view/download the document. We appreciate those that have contributed to the documents on this website. Feel free to contact us if you would like to add your document to this page
Our Blog
Aquatic Sensor Workgroup Guidance Documents
The Aquatic Sensor Workgroup is a public-private partnership of water-quality monitoring agencies, industry, and academia whose mission is to ensure that water-quality data collected by sensors are of known and documented quality. They have published several guidance documents that benefit anyone using or preparing to use water quality monitoring sensors for surface water or groundwater monitoring applications.
Flow Validation of London Avenue Pumping Station for the USACE New Orleans Levee System
On July 26, 2007 C.C. Lynch & Associates Inc., participated in a flow validation study in conjunction with the USACE Engineering Research Development Center (ERDC) for the purposes of determining the pumping capacity of the New Orleans Levee London Avenue Pumping Station pictured below.
Comparing Absolute and Gauged Pressure Sensors
This technical note describes the difference between absolute and gauged pressure sensors and explains the proper use of each type of sensor in different applications for In-Situ, Inc. LevelTROLL and AquaTROLL instruments. Figure 1 provides a general illustration of the forces measured by a pressure sensor’s internal strain gauge.
Criteria for Proper Weir Design
The sharp-crested weir is probably the most common open channel primary device we find for measuring flow. It is basic, and usually, the least expensive design option. While most weir installations we encounter do perform well, they are too often outdated, misapplied, or not maintained for present flow conditions. Many of our customers are surprised…
Flow Measurement Solution….The H-Flume
Recently, an industrial plant needed an accurate means to measure flow from a tank. Since most commonly used flow equations for weirs rely on a sharp-crested weir plate, the thick tank sidewall presented an issue. We were uneasy with assumptions, no flow chart, and exactly how to convert level to flow rate. Too, windy conditions…
Logging Rain Gauge
Teledyne Isco offers two options for a logging rain gauge. The Isco 676 Rain Logging System uses an Isco 674 rain gauge and a 4120 Flow logger (minus the submerged pressure transducer) be to record rain events. The second option, Isco 677 Rain Logging System, uses the same 674 rain gauge but the more advanced…
Japan’s Public Works Research Institute’s Findings on FRP Gate Evaluation
Japan’s Public Works Research Institute performed an evaluation of 53 fiberglass reinforced plastic hydraulic gates that have been in use for over 30 years with little maintenance. Their evaluation included visual inspection of in-service FRP gates, tensile tests on one FRP gate in use for 35 years, and accelerated weather weathering tests on hand lay…
Stormwater Sampling System Equipment & Example Site Video
Stormwater sampling presents a number of challenges to the municipality, researcher, consultant, or industrial user whether the sampling is required by permit or if the sampling is part of a research project. Many times the sampling location is remote, or, even if it is close, it may not be visited on a daily basis to…
Is Your Instrument Dry??? The Importance of Desiccant Maintenance
It is summer time and hot and humid conditions are upon us. Now is a good time to check and make sure your instruments are equipped with the proper desiccant. For equipment with vented level sensors, the desiccant prevents moisture from getting into the vent tube that provides a reference to atmospheric pressure. Failure to…
Real-time Water Tower Pressure Monitoring Via the Web
It is as simple as connecting a sensor to an existing tap at the water tower or on a water line within the distribution system and powering up the modem and you can access your water tank pressures or distribution system pressures on the Internet.
Flume Selection Guidance
One of the most frequent requests that we get from civil engineers during WWTP design is for flume selection guidance. While there are many complex aspects that need to be considered in flume selection and outfall channel configuration, there are a few basic considerations that can be evaluated to streamline the process.
Low Flow Groundwater Sampling Simplified
Low flow groundwater sampling has become the norm for collecting groundwater samples during preliminary groundwater investigations, long-term groundwater monitoring, and during remedial activities. By using low flow purging and sampling techniques groundwater samples can be collected from a monitoring well that are representative of the groundwater within the formation adjacent to the well screen without…