NextGen EngineeringNextGen Engineering, Inc. (NextGen) was founded in 2012 with the primary goal of providing exceptional expertise to clients and partnering firms. NextGen specializes in the areas of civil engineering, watershed and water resource planning, floodplain management, and is committed to training the “next generation” of water resource practitioners. NextGen is comfortable undertaking complex and highly technical projects, and through our network of core contractors and specialists, can assemble the right team to meet the specific requirements of the project or client. NextGen is a Certified Small Business, with its main office in Tucson, Arizona, and a project office in Ventura, California.

We offer specialized services in the following areas:


Mission Statement

NextGen’s purpose is to lead in planning and implementing water resource and civil engineering projects that will be socially, economically and environmentally sustainable; and to help train the next generation of water resource professionals.


Civil Engineering & Design

Engineering and design services for flood protection facilities include river embankments, open channels, underground conduits, levees, and debris and detention basins; creek restoration, and the use of bio-engineering methods to retain and enhance environmental values of project sites. Designs typically include the use of spurs, dikes, large wood debris (LWD), vegetation and natural materials, depending on the project.

  • Hydrology & Hydraulic Analysis
  • Levee & Embankment Designs
  • Detention & Retention Analysis
  • Water Supply and Sewer Networks
  • Grading & Drainage Plans
  • Wastewater Management
  • Scour Depth Analysis
  • Rip Rap Designs

Floodplain Management, Mapping & Hydraulic Analysis

NextGen offers complete turn-key services for all aspects of floodplain assessments, management, and design. Our staff reputation in conducting hydrologic studies and familiarity with clients' criteria and procedures has earned the confidence of public agencies, municipalities and homeowners. NextGen staff regularly evaluates and processes floodplain map changes including: CLOMR, LOMR, and Floodplain Elevation Certificates. In addition, NextGen can set up stream flow monitoring stations or take field flow measurements using USGS methods and equipment for precise data collection. Specific services we offer include, but are not limited to:

  • Floodplain & Floodway Mapping
  • NFIP & FEMA Compliance
  • Scour Analysis
  • Mitigation Plans

NextGen also offers specialized consultations to property owners in terms of floodplain insurance. Recent increases in flood insurance requirements have encouraged property owners to evaluate their situation and examine their options. Specifically, NextGen can help property owners:

  • Determine if they have an Elevation Certificate, a document used to calculate the true risk premium and to make informed flood mitigation and rebuilding decisions;
  • Find ways to lower insurance premiums;
  • Integrate flood mitigation when remodeling or rebuilding;
  • Elevate homes to lower flood risk and reduce insurance premiums;
  • Weigh options for adding flood vents to foundation walls, or constructing breakaway walls;
  • And coordinate with local officials about community flood mitigation action.

Want to learn more about the upcoming FEMA map changes in Ventura County? Check out this Q&A Factsheet

Watershed and Water Resource Planning

NextGen has worked on overarching issues such as land use planning, watershed assessments, and watershed management plans. This includes specific projects such as data collection, report writing, and implementing recommendations. NextGen staff directly worked on the Ventura River (CA) Watershed Management Plan (2015) and Sonoita Creek (AZ) Watershed Management Plan (2017). The NextGen team have also served as watermaster staff in adjudicated basins (San Gabriel River, and Central Basin), and participated in the court process to determine groundwater rights in Santa Maria. Our professional experience working in the regulatory nexus of land and water helps to provide valuable insights into planning processes, including conflict negotiations. We are committed to approaching projects with the overall health of the watershed in mind, and offer the following services:

  • Water Budgets
  • Stream Flow Analysis
  • Enhanced Recharge Projects
  • Regulatory Permitting
  • Stormwater Low Impact Development (LID)
  • Construction General Permit Compliance (QSD/QSP)
  • Water Quality TMDL Compliance
  • Manure & Nutrient Management Plans

Specific projects (especially those in close proximity to a water body) often require various permits on the federal, state, and local levels. NextGen can help ease stress during complex permitting processes by submitting necessary documentation to regulatory agencies, handling correspondences among multiple parties, and ensuring permit compliance. NextGen commonly works with the following permits:

  • FEMA CLOMR and LOMR permits
  • National Pollutant Discharge Elimination System (NPDES) permits for stormwater and construction (SWPPP and SWPCP)
  • Stormwater (MS4) drainage plans and permit requirements
  • The Construction General Permit – SWPPP and SWPCP
  • Pima County Floodplain Permit
  • CalTrans Standard Encroachment Permit
  • Ventura County Encroachment and Watercourse Permit
  • Ventura County Grading Permit
  • Ventura County Floodplain Permit

Graphic Design and Visualization Services

NextGen offers services in topography, grading, drainage, site plans and geo-referenced mapping. Tools to help understand and design a project include: Shape file libraries, seamlessly converting and moving data between GIS (Geographic Information System) and CAD, using and creating three-dimensional (3D) rotating views and fly-trough’s.

  • AutoCAD
  • GIS Mapping
  • Surveying & Topographic Analysis
  • 3D Visualization & Video Animation

Technical Training & Stakeholder Engagement

NextGen staff can provide support for private, public, and non-profit sector clients in terms of both technical training, workshops, and community outreach initiatives. Check NextGen’s Facebook and Twitter pages for up-to-date information on trainings, or give us a call to inquire about specific training topics. Examples of specific training and outreach topics include:

  • Floodplain Management and Regulations
  • Water Flow Modeling (HEC-RAS, WSPG)
  • International WASH Trainings (see section below)
  • Stormwater Management and Drainage
  • Nutrient Management
  • Water Rights and Conflict Negotiation
  • Sea Level Rise
  • General Plan Updates and Community Participation Processes
  • Community Participation Meetings

International WASH Trainings and Projects

As part of our vision for the next generation, NextGen is working with Water supply and treatment, residential and public Sanitation, and community Hygiene practice. This is called a WASH Program in development and relief practice. A priority for NextGen is to provide professional skills, project management, time and financial support to programs that Train people who can be Trainers of others (Trainer of Trainers). A strong local partnership that is committed to continuing the project after we leave is a key requirement of NextGen’s involvement in training programs. Examples of recent WASH trainings that we have participated in are listed below:

  • Water Well Construction and Hand Pump Repair - Mar. 2015, Central Asia
  • Bio-sand Filters, Water Treatment - Feb. 2013, Central Asia
  • Pump Repair and Sanitation - Feb. 2012, Ethiopia
  • Community and School Latrines - Oct. 2010, Ethiopia



Fundamentals of Engineering Class (FEC)

Train to become an engineer. FEC is a 16-week practical course facilitated by NextGen Engineering. This course is geared to help working engineers who have been out of the classroom or those interested in engineering as a career. The FE exam is the first step towards the Professional Engineer License. Contact us for more information and to register at admin@ngeneng.com


We do LOMA's
(and many other FEMA floodplain map adjustments)

NextGen helps landowners get their structure, development, or portions of their parcel out of the FEMA floodplain when the elevation or location justifies the adjustment. This process is called a Letter of Map Amendment (LOMA). For straight forward cases we also do the e-LOMA that gives results within a day. If you need help understanding your floodplain options, contact us to arrange a free consultation at billo@ngeneng.com

Careers at NextGen

NextGen Engineering, is currently seeking a FULL TIME (32-40 hours per week) Project manager with Bachelors or Masters Degree - in Civil Engineering or Environmental Engineering or Hydrology with at least 4 years of work experience. Experience and interest in water resources, technical writing, consulting or teaching, Civil 3D or GIS (QGIS), and EIT are necessary. Having the PE credential and surveying experience are preferred. Please email your resume and cover letter to admin@ngeneng.com.


NextGen has worked with the following clients:

In California

  • Aspen Environmental Group
  • City of Ojai
  • City of Oxnard
  • City of Ventura
  • Craig Lopez, Architect
  • Hopkins Groundwater Consultants
  • Ivy Lawn Memorial Park, Ventura
  • Leisure Village, Camarillo
  • Lobero Townhomes, Santa Paula
  • Oakridge Geoscience, Inc.
  • Ojai Valley Land Conservancy
  • OST Trucks and Cranes, Ventura
  • Pacific Heritage Communities
  • Resource Conservation District
  • RW Toedter, LLC
  • Sespe Consulting
  • Staples Construction
  • Turtle Conservancy
  • Ventura County Transportation Department
  • Ventura County Watershed Protection District
  • Ventura Regional Sanitation District
  • Westwood Community Corporation

In Arizona

  • Degan Construction
  • Epcor
  • Three Canyons Domestic Water Improvement District
  • Town of Patagonia
  • Urban Engineering


Bill O'Brien

Principal Engineer

Bill has over 25 years of professional experience in engineering, planning, and design for water resources and land use. Specific experience includes:

Hydrology, river and pipeline hydraulics, technical writing, plan reviews, drainage; FEMA floodplain management, insurance, and map changes; SWPPP’s and BMP design, watershed planning with water quality program analysis, wastewater management and bio-digester planning, water recycling, and conjunctive use planning.

Kiamani Castaneda

Kiamani Castaneda

Business Manager

Kiamani brings over 10 years of knowledgeable and effective administration, analytics and efficiency solution experience to our team. Having earned her degree in business management she is proficient in building and maintaining professional relationships, navigating teams through changing environments and is committed to delivering superior service. With a keen interest in protecting our water resources she actively seeks innovative solutions that our company can pass on to our internal and external clients.

Garrett Erickson

Garrett Erickson

Engineering Technician
B. Sc.

Garrett’s training and experience includes grant proposal and technical report writing, primary investigation of geology, groundwater, field orienteering, and cartography. Garrett brings to the table a fresh set of eyes on water resources with experience monitoring and modeling surface and groundwater flow relations. With his background in hydrogeology, he is eager to apply his experience with scientific research to practical engineering problem solving.


Marco Garnica

Marco Garnica

Assistant Engineer

Marco is a recent graduate from the University of Arizona with a degree in Civil Engineering. He specializes in using computer-based programs in water resources engineering. Marco has a comprehensive understanding of the technical elements of civil engineering, with knowledge of hydrologic modeling software in channels as well as in small watersheds.

Sean Schrag-Toso

Sean Schrag-Toso

Assistant Engineer
B.S.M.E., B.A., EIT

Sean began working with NextGen after returning to Tucson from Panama where he served as a Water, Sanitation and Hygiene (WASH) Volunteer with the Peace Corps. He brings a people based approach to engineering with a strong emphasis on education, communication, and community empowerment. With two bachelor degrees from the University of San Diego; one in Mechanical Engineering, alongside a General Arts degree, his background is broad and enjoys merging engineering with the humanities through writing and design. He also brings to the table a background in water systems design and analysis, watershed management, project management, international development, and an advanced level of Spanish speaking skills.

Sara Harders

Sara Harders

Assistant Engineer
B. Sc.

Sara is a recent graduate from the University of Arizona with a degree in Biosystems Engineering and is currently pursuing a Master’s degree in Biosystems Engineering and Professional GIST Graduate Certificate. She specializes in remote sensing and geographic information systems (GIS). Sara’s experience includes technical writing, watershed engineering, erosion control, and ecohydrology.

Core Contractors

NextGen has formed a network of core contractors and specialists who can form an appropriate technical team depending on the clients needs.

Dean Wilkinson

Hydraulic Modeling

Fred Ponce

AutoCAD Designer/Drafter

Sonya Webb

Associate Engineer


For further reading on the Ventura River watershed and Tucson watershed planning resources, local regulations and more, check out these links:


Contact Us

877 S. Alvernon Way, Suite 200B
Tucson, Az. 85711
(520) 561-6467


Mailing Address
5142 E. Holmes Street
Tucson, AZ 85711


* indicates required
California Project Office
374 Poli Street, Suite 207
Ventura, CA 93001
(805) 798-7664