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
Solution for Excessive Approach Velocity In Flumes
Accurate flow rate measurement is highly dependent upon the approaching flow conditions. The approaching flow should be well distributed, laminar, and free of surface waves. To aid in the transition of flow from what is typically a wider approach channel into the flume, the use of curved wingwalls or flared transitions should be used to…
Plasti-Fab Engineered Composite Flow Control Gates . . . . . There Is a Difference!
Article courtesy of Mike Keegan with Plasti-Fab, Inc. Referring to a Plasti-Fab gate or stop log as FIBERGLASS is like stating a Porsche Carrera GT is just a CAR. They both might fit the basic definition, but that is where the similarities end! Conventional fiberglass molding and fabrication techniques (spray-up or chopper gun processing) are…
The New Isco LaserFlow Non-Contact Flow Meter
We are excited to announce that in October 2012, Teledyne Isco will begin shipping the new LaserFlow non-contact flow meter. The LaserFlow meter remotely measures flow in open channels with non-contact Laser Doppler Velocity technology and non-contact Ultrasonic Level technology. The LaserFlow is unlike other non-contact flow meters which only measure surface velocity. The LaserFlow…
Measuring River Discharge – The Great Mississippi River Flood of 2011
Measuring River Discharge is a common project as the Gulf South representative of Teledyne RD Instruments. We are often called in to support important measurements. During the record flood event in spring 2011, we demonstrated the capability of the RDI RiverRay ADCP for the USACE ERDC. Their local support consultant Dimco, needed a capable Acoustic…
Selecting a Flume For an Existing Pipe or Channel
Open channel flow measurement can be a challenge in applications that require the placement of a flume in an existing pipe or channel. While most everyone is familiar with Parshall Flumes, in many cases, there are other flume options that can provide for equal or better accuracy and are better suited for a particular pipe…
Visit Us at WEFTEC 2012 in New Orleans – September 29th – October 3rd
Are you attending WEFTEC this year? If so, be sure to stop by and visit us at the booths of our principals. Teledyne-Isco Booth 4535, Hall F – See the new Isco 5800 Refrigerated Sampler, the new Isco LaserFlow, and the new accQpro Flow Meter s::can Measuring Systems Booth 6821, Hall H – See…
The New Isco 5800 Refrigerated Sampler
Beginning in October 2012 Teledyne Isco will begin shipping their newest addition to the refrigerated sampler market, the Isco 5800 Refrigerated Sampler. This sampler will replace and expand upon the modular concept that was used with the Isco 4700 Refrigerated Sampler. All of the same features found on the 4700 are still available so there…
Real Time Water Quality Monitoring on Rivers
Long term water quality monitoring on rivers can be an arduous chore; and very expensive. The cost of sending teammates into the field continues to skyrocket, especially when it is over water; not to mention the inherent safety concerns. All this for what amounts to a ‘snap-shot’ of water quality at the time of measurement…
Flow Measurement at an Industrial Outfall Using the Index-Velocity Rating Method
Channels with a large depth to width aspect ratio present a challenge when it comes to accurately measuring flow rates in real time. The index velocity method provides a solution for real time flow rate reporting in situations where traditional stage-discharge ratings are not possible. The index velocity method uses a mathematical model to calculate…
Teledyne Isco Automatic Sampler Pump Tubing Maintenance
Changing pump tubing is a periodic maintenance item for Isco Automatic Samplers. The need for pump tubing replacement varies with the frequency of sampling, the suction line length, purge intervals, rinse cycles and the model of sampler.
Parshall Flumes – Free vs. Submerged Flow
As often as we use Parshall flumes for open channel flow measurement, it is important to understand “free versus submerged flow” conditions; as it greatly impacts the accuracy of the installation…or the lack thereof. While any primary device could be affected by submerged flow conditions, there isn’t much data to be found on the topic.…
The Thelmar Weir – Insertable Volumetric Weir for Flow Measurement in Pipes
Thelmar Insertable Volumetric Weirs are commonly used for temporary flow measurement in a pipe, or manhole; with relatively low flows. The Thelmar weir is calibrated compound weir that is inserted into the invert of a pipe and incorporates a 90° v-notch for measuring lower end of the range; then opens into a rectangular weir at…