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Hydrologists: Who Are They

February 08, 2023 · 7 min read

Hydrology is the scientific study of water, its distribution, and management, including the water cycle, water resources, and the physical, chemical, and biological characteristics of water. Hydrologists study precipitation, evaporation, infiltration, runoff, and groundwater flow, as well as the impact of human activities on water resources. They use this information to inform water management practices and make decisions about the use and conservation of water resources.

Hydrology plays a critical role in understanding the water resources available to us, how they change over time, and how they can be sustainably managed for future generations.


A hydrologist is a scientist who specializes in the study of water, including its distribution, circulation, and quality. Hydrologists study the water cycle, including precipitation, evaporation, infiltration, runoff, and groundwater flow, to better understand water resources and inform water management practices. They also examine the impact of human activities, such as land use changes and pollution, on water resources.

Hydrologists use a variety of tools and techniques, such as remote sensing, computer modeling, and field measurements, to gather data and make predictions about water resources. They may work for government agencies, consulting firms, or academic institutions, and may be involved in projects such as flood prediction, drought management, water resource planning, and groundwater protection.

The role of a hydrologist is to provide valuable information and insights that can be used to make informed decisions about water resources and promote sustainable water management practices.


The duties of a hydrologist can vary depending on their specific area of expertise and place of work, but may include:

  1. Studying water resources: Hydrologists study the water cycle and the physical, chemical, and biological characteristics of water to understand water resources.
  2. Conducting fieldwork: Hydrologists collect data on water resources through field measurements, such as stream flow, water level, and water quality.
  3. Analyzing data: Hydrologists use mathematical models and statistical analysis to interpret data and make predictions about water resources.
  4. Developing water management strategies: Hydrologists provide information and insights to support decision-making about water resources and promote sustainable water management practices.
  5. Communicating findings: Hydrologists present their research and findings to a variety of audiences, including government agencies, the public, and other scientists.
  6. Collaborating with other scientists: Hydrologists often work with other scientists, such as geologists, meteorologists, and engineers, to address complex water resource problems.
  7. Advising on water resource projects: Hydrologists may provide advice and guidance on water resource projects, such as dam construction, water supply planning, and groundwater management.

Overall, the duties of a hydrologist involve gathering and analyzing data to better understand water resources and inform decision-making about water management practices.


In addition to the duties mentioned above, a hydrologist may have other responsibilities, including

  1. Developing computer models: Hydrologists may use computer simulations to predict water resource changes and assess the impact of different water management scenarios.
  2. Designing and implementing monitoring programs: Hydrologists may design and implement programs to monitor water resources and assess changes over time.
  3. Assessing water quality: Hydrologists may collect and analyze water samples to assess water quality and identify sources of contamination.
  4. Investigating natural disasters: Hydrologists may be involved in investigating the impact of natural disasters, such as floods and droughts, on water resources.
  5. Developing policy and regulations: Hydrologists may provide technical support to government agencies in the development of water resource policies and regulations.
  6. Conducting research: Hydrologists may be involved in conducting independent research to advance the field of hydrology and contribute new knowledge to the scientific community.
  7. Teaching and mentoring: Hydrologists may also have responsibilities in teaching and mentoring, such as educating students or providing guidance to junior scientists.

These additional responsibilities may vary depending on the hydrologist's place of work and areas of expertise, but they demonstrate the wide-ranging and important role that hydrologists play in managing and understanding our water resources.


Hydrologists can work in a variety of settings, including

  1. Government agencies: Hydrologists may work for government agencies, such as the US Geological Survey (USGS), the Environmental Protection Agency (EPA), or state and local departments of natural resources.
  2. Consulting firms: Hydrologists may work for private consulting firms, where they provide advice and support to clients on water resource management and development projects.
  3. Academic institutions: Hydrologists may work for universities, research institutes, or other academic institutions, where they may conduct research and teach.
  4. Non-government organizations (NGOs): Hydrologists may work for NGOs, where they may focus on issues such as water resource conservation, sustainable water management, and environmental protection.
  5. Private industry: Hydrologists may work for private companies, such as water utilities, mining companies, or engineering firms, where they may be involved in water resource management and development projects.

The specific work environment for a hydrologist will depend on their area of expertise, place of work, and the projects they are involved in. Regardless of their work setting, hydrologists play a critical role in managing and understanding our water resources.


Hydrologists use a variety of tools and techniques in their work, including

  1. Field equipment: Hydrologists use field equipment, such as flow meters, water level sensors, and water quality sampling equipment, to collect data on water resources.
  2. Computers and software: Hydrologists use computers and specialized software to analyze data, build mathematical models, and simulate water resource changes.
  3. GIS and mapping tools: Hydrologists may use geographic information systems (GIS) and mapping tools to visualize and analyze water resource data.
  4. Laboratory equipment: Hydrologists may use laboratory equipment, such as spectrophotometers and mass spectrometers, to analyze water samples and assess water quality.
  5. Mathematical models: Hydrologists use mathematical models, such as hydrological models and numerical models, to predict water resource changes and assess the impact of different water management scenarios.
  6. Statistical analysis: Hydrologists use statistical analysis to interpret data and make predictions about water resources.
  7. Technical reports: Hydrologists prepare technical reports, summaries, and other forms of written communication to share their findings and insights with a variety of audiences.

These tools and techniques allow hydrologists to gather and analyze data to better understand water resources and inform decision-making about water management practices.


Whether a career as a hydrologist is a good choice depends on a variety of personal factors, such as your interests, skills, and goals. Some of the benefits of a career as a hydrologist include:

  1. Making a positive impact: Hydrologists play a critical role in managing and understanding our water resources, and their work can have a positive impact on the environment and communities.
  2. Varied work: Hydrologists can work in a variety of settings, including government agencies, consulting firms, academic institutions, NGOs, and private industry. This variety can lead to a dynamic and interesting career.
  3. Career growth opportunities: Hydrology is a rapidly evolving field, and there may be opportunities for career growth as new technologies and techniques are developed.
  4. Good pay: According to the US Bureau of Labor Statistics, the median annual salary for hydrologists was $79,870 in May 2019.

However, there are also some potential challenges to consider, such as:

  1. Required education and training: To become a hydrologist, you typically need to have a strong background in science and engineering, as well as advanced training in hydrology.
  2. Competition for jobs: There may be competition for jobs in some areas, particularly in government agencies and consulting firms.
  3. Working with complex data: Hydrologists work with complex data and mathematical models, which may require a strong aptitude for science and technology.

Ultimately, whether a career as a hydrologist is a good choice will depend on your personal interests, skills, and goals, as well as the job market in your area. If you are interested in water resources and have a strong background in science and engineering, a career as a hydrologist may be a good fit for you.

by Olena Sobolieva

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