Our Methods & Technology

We use state-of-the-art technology and a direct measurement approach to gather our river data. We literally float the river and measure as we go, ensuring the most accurate measurements.

Data for Flow Modeling

We measure river flow, depth, water surface slope, temperature, habitat factors, and more. Regardless of your flow modeling goals, we can customize our services to ensure you gain access to the data you need.

Customized Services

Our data gathering and analysis services can be customized for fish habitat and river restoration projects, river consultants, state and local agencies, flow modelers, recreational river users, application developers, and more.

Our Mission:
To provide our clients with accurate and complete river data and the best river mapping and analysis tools available.


Empower all concerned and interested parties, federal and state, public and private, with a greater understanding of river environments to ensure optimal management of this most vital shared resource.

Enable river professionals, fisheries, and wildlife biologists to better understand, manage, and restore endangered species habitats by providing river data collection and analysis services.

Enable hydro-electric power generation facilities to optimize management of stream flows to meet the needs of all constituents, including power consumers, agricultural, transportation, recreation interests, and wildlife habitat managers and biologists.

Let us introduce ourselves

Freshwater Map

Freshwater Map is the result of Dr. Mark Lorang’s 30-plus years of research in oceanography and limnology.   Dr. Lorang is a pre-eminent expert in the study of sediment transport and 3-D-dimensional flow analysis in aquatic environments.

Mark’s extensive experience measuring flow and depths in aquatic environments and how those metrics contribute to a better understanding of river ecosystems has created better solutions to the central challenge for river professionals:  

How do we best manage public aquatic resources for all parties including wildlife managers, hydro-electric dam operators, agricultural, recreation, and transportation interests?

A little about our methods and technologies

How We Do It

Using the most sophisticated equipment available, proprietary software, and a dedicated team of highly skilled river technicians, GIS specialists, and software programmers, Freshwater Map defines and maps aquatic environments by collecting millions of data points both above and below the water.

Our highly detailed data empowers river professionals with actionable insights into river habitats. With this information, river professionals are able to more efficiently, effectively, and economically meet the needs of their respective constituencies, and ensure the health of their rivers. In the traditional flow-modeling sphere, our data collection services are of great benefit, allowing flow modelers to base their models on empirical data, gathered directly from the water itself.

We are here to help river professionals achieve their goals

Customized Services

Whether you require a basic flow map, a map of ideal sturgeon habitat, or a customized package of river data collection services for your own river models, we are here for you.

Our Maps

We provide detailed maps based on immense data sets collected during different flow rates (typically high water in spring and low water in fall). The volume and specific data metrics we capture, when processed with our River Analyzer Software, enable us to generate a wide variety of both standard and customized maps based on our client needs.

Better Data Collection

We directly measure river systems, ensuring our data is the most accurate and high-resolution available. Direct measurements enable us to define habitat at an extraordinarily detailed level, which can validate and/or enhance existing flow models.

Our Difference

Freshwater Map utilizes Lagrangian specification of the flow field as our teams literally run the river.  Our river teams capture 3-D flow, depth, temperature, and hundreds of other metrics twice each second as we flow with the current at speeds of about 1.5 meters/second.  Data sets include tens of millions of data points for each river we analyze.

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