Geosynthetic liner installation
Western-EGI›Services›Water Resources
Water Resources Engineering

Move Water.
Control It.
Deliver It.

From stormwater drainage and culvert design to water supply infrastructure and hydrology analysis — Western-EGI's water resources practice covers both sides of the water engineering equation. We design systems that handle what Wyoming's weather throws at them and deliver what communities and industries depend on.

11+
Years in Wyoming
2
Disciplines — Drainage & Supply
5
State PE Licensure
PE
Licensed Engineers On Staff
Water Resources Engineering

Both Sides of Water Engineering

Water is at the center of most infrastructure challenges in Wyoming — too much of it destroying roads and eroding sites, or not enough of it reaching the communities and facilities that depend on it. Western-EGI's water resources practice addresses both problems with the same integrated approach that defines all of our work: civil design informed by geotechnical reality, drainage systems sized by in-house hydrology, and utility infrastructure designed by the same engineers who understand the ground it goes into.

We design stormwater and drainage systems for roads, sites, and developments across Southwest Wyoming — culverts, channels, detention basins, storm sewers, and erosion control. We also design water supply and distribution infrastructure — water lines, pump stations, and utility systems for municipalities, industry, and development projects. And when a project needs to understand how water moves across a site or watershed before design begins, we perform the hydrology analysis that makes that possible.

Geosynthetic liner installation — water containment project
Water Resources · Wyoming
Drainage & Stormwater

Drainage Engineering

Stormwater management is one of the most consequential aspects of any site or infrastructure project in Wyoming — and one of the most commonly underdesigned. Western-EGI sizes drainage systems from real hydrology, not rules of thumb, and coordinates drainage design directly with the geotechnical and civil design teams who understand what happens when water gets into the ground.

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Culvert Design

Hydraulic sizing and structural design for culverts under roads, driveways, and embankments — from simple corrugated metal pipe to large box culverts.

  • Hydrologic analysis for culvert sizing
  • Inlet and outlet control analysis
  • CMP, RCP, HDPE, and box culvert design
  • Headwall and wingwall design
  • Fish passage consideration where required
  • Replacement and upgrade design
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Channels & Swales

Open channel design for drainage conveyance — from grass-lined roadside swales to rock-lined channels handling high-velocity flows.

  • Channel sizing and velocity analysis
  • Grass-lined and riprap channel design
  • Outlet protection and energy dissipation
  • Roadside ditch design and grading
  • Channel stabilization and erosion control
  • Diversion channel design
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Detention & Retention

Stormwater detention and retention basin design for peak flow attenuation and water quality management on development and infrastructure projects.

  • Detention basin sizing and routing
  • Outlet control structure design
  • Emergency spillway design
  • Retention pond design
  • Grading and embankment design
  • Maintenance access planning
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Storm Sewer Systems

Piped storm sewer design for site development, roadway projects, and municipal infrastructure — from inlet layout through outfall design.

  • Storm sewer network layout and sizing
  • Inlet spacing and capacity analysis
  • Pipe material selection (RCP, HDPE, PVC)
  • Manhole and junction structure design
  • Outfall and energy dissipation design
  • Construction plans and specifications
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Erosion Control & SWPPP

Stormwater Pollution Prevention Plans and erosion control design for permitted construction sites — meeting WPDES and municipal permit requirements.

  • SWPPP preparation and certification
  • BMP selection and design
  • Silt fence, inlet protection, and sediment basin design
  • Stabilization and revegetation planning
  • Permit compliance documentation
  • Inspection support during construction
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Drainage Master Planning

Watershed-scale drainage analysis for municipalities, counties, and large developments — identifying deficiencies and establishing a capital improvement framework.

  • Existing system inventory and assessment
  • Watershed delineation and modeling
  • Deficiency identification
  • Capital improvement prioritization
  • Cost opinion development
  • Report and GIS deliverables
Water Supply & Distribution

Water Supply Infrastructure

Western-EGI designs water supply and distribution infrastructure for municipalities, industrial clients, and development projects across Wyoming. Our civil engineers have designed hundreds of miles of water utility infrastructure — from transmission mains to distribution laterals — and understand the construction realities that make the difference between a system that performs and one that becomes a maintenance problem.

Water Distribution Design

Complete design services for water distribution systems — from main extensions serving new development to full system rehabilitation for existing infrastructure. Western-EGI coordinates water design with civil grading, pavement, and site design to avoid the conflicts and redesigns that come from siloed utility planning.

  • Water main design — PVC, HDPE, ductile iron
  • Service lateral layout and sizing
  • Valve, hydrant, and fitting design
  • Pressure zone analysis
  • Meter pit and service connection design
  • Coordination with existing system records
  • Construction plans, specs, and cost estimates
Pump Stations & Transmission

Design of water transmission infrastructure and pump stations for municipal and industrial water systems. Western-EGI's experience with live system work — including hot tap and connection-to-existing design — means we can design tie-ins and extensions that minimize service disruption and construction risk.

  • Booster pump station design
  • Transmission main design and alignment
  • Hot tap and live connection design
  • Pressure sustaining and reducing valve design
  • Air release and vacuum break valve design
  • Water storage tank site design
  • Operations and maintenance considerations
Hydrology

Hydrology Analysis

Hydrology is the foundation of every drainage design decision — peak flow rates, runoff volumes, and the frequency of design storm events. Western-EGI performs hydrologic analysis in-house, using rational method and more sophisticated modeling approaches where the project warrants it. We don't outsource the numbers that drive the design.

Site & Watershed Hydrology

Peak flow analysis for culvert sizing, detention basin design, storm sewer capacity, and drainage master planning. Western-EGI delineates watersheds from survey and topographic data collected in-house — the same data used for civil design — so hydrology inputs reflect actual site conditions, not generalized assumptions.

  • Watershed delineation and area calculation
  • Rational method and modified rational method analysis
  • TR-55 / TR-20 runoff modeling
  • Design storm frequency analysis (2-, 10-, 25-, 100-year)
  • Pre- and post-development runoff comparison
  • Detention routing and outflow analysis
Floodplain & Channel Analysis

Western-EGI performs floodplain and channel hydraulic analysis to support drainage design, site planning, and permit applications. While we do not perform formal FEMA Letter of Map Amendment (LOMA) or Letter of Map Revision (LOMR) submittals as a primary service, we provide the engineering analysis and documentation that supports those processes when clients need to engage FEMA or local floodplain administrators.

  • HEC-RAS channel hydraulic modeling
  • Floodplain delineation and mapping
  • Bridge and culvert backwater analysis
  • Base flood elevation determination
  • Encroachment and fill impact analysis
  • Engineering documentation for permit support

Drainage Designed with
the Ground in Mind.

Western-EGI's drainage engineers work alongside our geotechnical team. When we design a detention basin, we know the infiltration rate of the soil below it. When we design a culvert, we know whether the embankment can handle the headwater. That integration is the difference between a drainage system that works and one that becomes a liability.

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Representative Projects

Water Resources in Action

Drainage Design & CMT — Sweetwater County, WY
County Road #33 & Long Drive

Drainage design including culvert sizing, roadside ditch grading, and outlet protection for two Sweetwater County paved road projects. CR #33 required investigation of recurring failures — drainage was a contributing factor. Long Drive revealed saturated subgrade and pumping during construction, requiring an in-field redesign using geogrid and crushed concrete that addressed both structural and drainage deficiencies simultaneously. Client: Sweetwater County Public Works (Gene Legerski, PE).

Year: 2020
Client: Sweetwater County Public Works
Staff: Lyman, Gerrard, Meek
Subdivision Infrastructure — Rock Springs, WY
Mustang Ridge Subdivision

Water and sewer infrastructure design for this 40+ lot residential subdivision in Rock Springs — including water distribution layout, sanitary sewer design, storm drainage, and permitting through WDEQ. Western-EGI coordinated utility design with the subdivision grading, retaining wall, and geotechnical work performed under the same contract, providing a fully integrated infrastructure package for the developer. Client: Amundsen Construction.

Value: $3M+
Client: Amundsen Construction
Staff: Lyman, Gerrard, Woods, Meek, Ditton
Site Drainage & Stormwater — Rock Springs, WY
WWCC Parking Lots — Rock Springs Campus

Stormwater management design for multiple WWCC parking lot improvements — including grading, inlet layout, storm sewer sizing, and erosion control. Unforeseen water infiltration required a mid-project design change; Western-EGI redesigned the drainage and base system using CTB and modified grading, addressing the root drainage problem while achieving substantial project savings. Client: WWCC (Chris Dever).

Years: 2019–2021
Client: Western Wyoming Community College
Staff: Lyman, Woods, Meek, Ditton
Statewide Pavement & Drainage — Wyoming
Wyoming National Guard Asphalt Maintenance

Pavement analysis and drainage evaluation for seven Wyoming National Guard facilities statewide — including surveying, geotechnical investigation, and site drainage assessment. Western-EGI evaluated drainage as a key factor in pavement deterioration at each facility and incorporated drainage improvements into the rehabilitation recommendations. Project advanced from study through design and construction in 2023. Client: Wyoming National Guard / A Pleasant Construction (Jim Jessen).

Value: ~$1.6M
Years: 2022–2023
Staff: Lyman, Woods, Meek
Water Utility Design — Southwest Wyoming
Water & Sewer Infrastructure — Multiple Projects

Western-EGI has designed water distribution and sanitary sewer systems for site development and road projects across Southwest Wyoming — including main extensions, service connections, hot tap design, and coordination with municipal utility departments. PVC, HDPE, and ductile iron design across a range of pressure zones and soil conditions. Includes utility coordination for the Memorial Hospital northwest entry and Events Complex fire suppression system.

Years: 2014–Present
Client: Various Municipal & Private
Staff: Lyman, Gerrard, Woods, Ditton
Get In Touch

Ready to Work Together?

Whether you need drainage design for a road project, a water main extension, or a full stormwater management plan, Western-EGI is ready to help. Contact us to discuss scope and approach.

Office
415 N Street / PO Box 1478
Rock Springs, WY 82902
Phone
(307) 362-5180
Email
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Water Resources Contact
Brandt Lyman, PE
Rob Gerrard, PE
Submit an Inquiry
Submit an Inquiry