HYDROLOGIST

Clarification from the agency

This announcement is open to U.S. Citizens or Nationals; and Career transition eligibles (CTAP, ICTAP, RPL).

At the full performance level (GS-13) the major duties of this position include, but are not limited to the following:

• Conduct fundamental and applied research in subsurface hydrology, multiphase flow through porous media, poromechanics, and related geoscience disciplines.
• Design, develop, and execute numerical simulations of single- and multiphase fluid flow in geologic formations, including evaluation of physical and thermodynamic impacts associated with fluid injection.
• Translate data from real-world geologic systems into conceptual and computational models, applying sound scientific judgment while accounting for inherent uncertainties.
• Collaborate effectively within multidisciplinary teams to provide technical expertise, communicate scientific results, and prepare comprehensive written reports supported by tables, figures, and charts. Present complex findings on geologic energy resources to scientific audiences at national and international conferences.
• Apply artificial intelligence and machine learning methods to enhance numerical modeling and simulation workflows, integrating advanced computational tools into research activities.

Duties will be developmental in nature when filled below the full performance level.

You may be required to travel overnight away from home up to 1-2 nights per month. You must obtain a government charge card for travel purposes.

Salary:
GS-12: $102,415 (step 1) - $133,142 (step 10)
GS-13: $121,785 (step 1) - $158,322 (step 10)

First time hires to the Federal government normally start at the step 1 rate.

Conditions of employment

• Must be a U.S. Citizen or National.
• Appointment subject to background investigation and favorable adjudication.
• Males born after 12-31-59 must be registered for Selective Service.
• Direct Deposit participation required.
• Successfully pass the E-Verify employment verification check. To learn more, visit www.dhs.gov/EVerify/.
• Must have and maintain a valid driver's license throughout employment.
• You must pass a physical examination.
• You are required to complete training, obtain and maintain a government credit card with travel and purchase authority.

As a condition of employment for accepting this position, you will be required to serve a 1-year probationary period during which your fitness and whether your continued employment advances the public interest will be evaluated.

This probationary period is an extension of the appointment process and therefore requires the agency to determine if continued employment would advance the public interest, meet the organization goals and mission of the agency, and/or otherwise promote the efficiency of the service. In determining if your employment advances the public interest, the agency will consider:

• your performance and conduct;
• the needs and interests of the agency;
• whether your continued employment would advance organizational goals of the agency or the Government; and
• whether your continued employment would advance the efficiency of the Federal service.

Under applicable law, the employment of an individual serving a probationary or trial period automatically terminates when that period ends unless the agency affirmatively certifies, in writing, that the individual's employment should continue and that their appointment should be finalized. In the absence of agency action to affirmatively certify continued employment beyond the probationary or trial period, such appointments are terminated.

Upon completion of your probationary period your employment will be terminated unless you receive certification, in writing, that your continued employment advances the public interest.

Qualifications

All qualifications must be met by the closing date of this announcement-11/06/2026-unless otherwise stated in this vacancy announcement.

To receive credit for experience, your resume MUST state either "full-time" (or "40 hours a week") or "part-time" with the number of hours worked per week to ensure proper crediting of specialized experience. Failure to adequately provide information needed to determine number of hours worked in each position may result in that time not being credited when evaluating qualifying experience. For periods of time that reflect military service, the DD-214 or Statement of Service is sufficient to meet the full and/or part-time hours requirement as the service dates will be reflected.

Minimum Qualification Requirements: To qualify for this position, you must meet the following minimum qualifications:

Basic Educational Requirement AND/OR Specialized Experience for the series to which you are applying.

Basic Educational Requirements: In addition to the specialized experience requirements for this position, you must meet at least one of the following:

• A. Degree: physical or natural science, or engineering that included at least 30 semester hours in any combination of courses in hydrology, the physical sciences, geophysics, chemistry, engineering science, soils, mathematics, aquatic biology, atmospheric science, meteorology, geology, oceanography, or the management or conservation of water resources. The course work must have included at least 6 semester hours in calculus (including both differential and integral calculus), and at least 6 semester hours in physics. Calculus and physics, as described above, are requirements for all grade levels. You must submit transcripts.

-OR-

• B. Combination of education and experience: course work as shown in A above, plus appropriate experience or additional education.

-AND-

To qualify for this position at the GS-12 grade level:

• Specialized Experience Requirement: you must possess at least one full year of specialized experience equivalent to the GS-11 level in the Federal service (obtained in either the public or private sectors). Specialized experience must include fundamental or applied research in subsurface hydrology or multiphase flow through porous media. Experience could include assisting in selecting, constructing, calibrating, and validating numerical groundwater models; integrating field observations, geologic data, and hydrologic measurements; and simulating groundwater flow, aquifer responses, and groundwater-surface water interactions under varying hydrologic and management conditions. At this level, experience should demonstrate a very good knowledge of the principles of hydrology and their application, and the ability to independently perform scientific work of considerable difficulty. You must include hours per week worked.

-OR-

To qualify for this position at the GS-13 grade level:

• Specialized Experience Requirement: you must possess at least one full year of specialized experience equivalent to the GS-12 level in the Federal service (obtained in either the public or private sectors). Specialized experience must include leading a team in fundamental or applied projects of subsurface hydrology or multiphase flow through porous media. Experience could include selecting, constructing, calibrating, and validating numerical groundwater models; integrating field observations, geologic data, and hydrologic measurements; and simulating groundwater flow, aquifer responses, and groundwater-surface water interactions under varying hydrologic and management conditions. The complexity of this work typically required extensive modification and adaptation of standard procedures, methods, and techniques, and the development of totally new methods and techniques to address novel or obscure problems for which guidelines or precedents were not substantially applicable. At this level, experience should demonstrate extensive knowledge of the principles of hydrology and highly developed ability in their application, and wide latitude for the exercise of independent judgment to perform scientific work of marked difficulty and responsibility. You must include hours per week worked.

Volunteer Experience: Experience refers to paid and unpaid experience, including volunteer work done through National Service programs (e.g., Peace Corps, AmeriCorps) and other organizations (e.g., professional; philanthropic; religious; spiritual; community, student, social). Volunteer work helps build critical competencies, knowledge, and skills and can provide valuable training and experience that translates directly to paid employment. You will receive credit for all qualifying experience, including volunteer experience.

How you will be evaluated

You will be evaluated for this job based on how well you meet the qualifications above.

Your qualifications will be evaluated based on your application materials (e.g. resume, supporting documents), the responses you provide on the application questionnaire, and the result of any additional assessment(s) required for this position.

Your resume must not exceed 2 pages. Only the document submitted as the "Resume" under the Documents section will be used to determine your qualifications/eligibility and for rating purposes. In the event you submit more than one resume, only the latest submission will be reviewed.

Candidates will be rated and ranked using Category Rating procedures. These procedures place candidates with veteran's preference above non-preference eligibles within each category. Veterans with a service-connected disability of at least 10 percent are listed in the highest quality category, except when the position being filled is scientific or professional at the GS-09 grade level or higher. Under Category Rating, candidates will be rated and ranked into the following categories:

• Best Qualified - applicants possessing experience that substantially exceeds the minimum qualifications of the position including all selective factors and are highly proficient in all requirements of the job and can perform effectively in the position

• Well Qualified - applicants possessing experience that exceeds the minimum qualifications of the position including all selective factors and are proficient in most of the requirements of the job

• Qualified - applicants possessing experience that meets the minimum qualifications of the position including all selective factors and are proficient in some, but not all of the requirements of the job.

You will be assessed in the following competencies (knowledge, skills, abilities, and other characteristics):

• Analytical
• Communication
• Data Interpretation
• Data Management
• Modeling and Simulation
• Program Management
• Reasoning
• Research
• Technology Application

Overstating your qualifications and/or experience in your application materials or application questionnaire may result in your removal from consideration. Cheating on an assessment may also result in your removal from consideration.

To be considered for this position, you must complete all required steps in the process. In addition to the application and application questionnaire, this position requires successful completion of additional assessment(s), including a structured resume review. These assessments measure the critical competencies listed above that are required to successfully perform the job.

Current or former displaced Federal employees who are surplus, displaced, or involuntarily separated have special priority selection rights under the Agency Career Transition Assistance Program (CTAP) or the Interagency Career Transition Assistance Program (ICTAP). To be considered under CTAP/ICTAP, you must be well-qualified, score at least 85 (i.e., meet the minimum qualification requirements, including any selective placement factors; education, and experience requirements), and be able to perform the duties of the position upon entry.

Providing false or misleading information on your resume or supporting documentation may result in removal from consideration or other action consistent with applicable federal hiring regulations. Applicants who include vulgar, offensive, or inappropriate language or information in their application package will be ineligible for further consideration for this position.

The following documents are required and must be submitted by 11:59 PM (ET) on 11/06/2026 - unless otherwise stated in this vacancy announcement:

1. Resume which includes a list of all significant jobs held and duties performed, with dates in month-year format (include month/day/year format if needed for 52 weeks of experience), and indicate hours worked per week (or full-time). Your resume must clearly show how long you have held each grade/rank. Resumes must not exceed two single-sided pages and resumes longer than two pages will not be accepted. The minimum font size is 10-point for all body text. All resumes must maintain a minimum 0.5-inch margins on all sides to ensure readability and prevent excessive content compression. Including supplemental pages or attachments disguised as resume extensions are prohibited and will not be reviewed to determine your eligibility/qualifications. Your 2-page resume must contain information sufficient to make a valid determination that you fully meet the specialized experience requirements. If you have federal experience, you should include series, and grade for each position held, and if experience is part of a career ladder position, you must clearly distinguish the job duties and length of time working for each grade level. More information on how to write a Federal Resume: https://help.usajobs.gov/faq/application/documents/resume/what-to-include
2. Complete All Required Assessment(s).
3. All college transcript(s), if qualifying based on education. Please submit both undergraduate and graduate level transcripts, as applicable.
4. Veterans Preference Documentation, if applicable. Veterans must submit a copy of your latest Certificate of Release or Discharge from Active Duty, DD-214 (member 4 copy) or other Documentation of Service and Separation under Honorable Conditions, as listed on the SF15. If you are a Disabled Veteran, Purple Heart Recipient, or Parent or Spouse of a Disabled or Deceased Veteran, you must submit all additional proof required by the SF15, and if applicable, a completed SF15. You may request a copy of your Department of Veterans Affairs letter from www.va.gov/records/ or call 1-800-827-1000. If you are a veteran within 120 days of discharge, you must submit signed documentation from the Armed Forces certifying: 1) your expected release/retirement from active duty, 2) under honorable conditions, 3) your pay grade/rank/rate at time of discharge, 4) dates of active-duty service, 5) any campaign or expeditionary medals received, & 6) dated within 120 days of your separation.
5. Interagency Career Transition (ICTAP) and Career Transition Assistance Plan (CTAP): You MUST submit proof of eligibility including 1) copy of the agency notice, e.g., RIF Separation Notice, Notice of Proposed Removal, etc.; 2) SF-50s (Notifications of Personnel Action) showing career/conditional tenure competitive status, promotion potential and duty location; and 3) your most recent performance appraisal. To exercise selection priority, displaced or surplus Federal employees must be well qualified. For more information visit: USAJOBS Help Center - Career Transition Programs (CTAP, ICTAP, RPL).

Failure to submit any of the above-mentioned required documents will result in loss of consideration due to an incomplete application package. It is your responsibility to ensure all required documents have been submitted.

Do not submit photographs with your application package. Documents with photographs may not be seen by hiring officials - you must remove your image from all documents.

Do not upload Adobe portfolio documents. Adobe portfolio documents are not viewable by our agency's staffing offices.

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