Civil Engineering services

Site Design 


Site Design

SynTier has the ability to take our clients building concepts and develop a site plan that effectively utilizes the surrounding area and enhance the site.  Our experience with residential, commercial, industrial and multi-family housing; works with the topography of the land for a constructible, economical and efficient design.

Stormwater design



SynTier's stormwater design services extend across multiple states, jurisdictions and site conditions.   Our team has worked all over the Northwest.  Our services for quality and quantity mitigation of stormwater include regional design; and site-specific, detention, retention and infiltration design.  SynTier also provides bio-filtration swales, bio-infiltraytion swales and mechanical treatment design.  Our stormwater services include culvert and drainage basin analysis. 

Roadway design



SynTier specializes in the design of new roadways, as well as the reconstruction and improvements to existing roads.  Our experience with private and public roadway design gives our team the expertise to effectively create designs that maximize the use of surrounding land.  We excel in design, specifically targeted towards large and small subdivisions, with a specialization for commercial and industrial development.  


Utility Design


SynTier has extensive experience with standalone water, sanitary sewer improvement, roadway utility design and site utility design.  Our team prides themselves on the challenges of designing utilities in multiple terrain types from the rolling hills of the Palouse to the flat basins of the Spokane and Clearwater Valleys.  Both situations create unique challenges for water and sanitary sewer design that we are equipped to handle.


Water System Hydraulic Modeling

Water Systems 

SynTier has experience with water system modeling for both new and existing water systems, including residential and commercial improvements.  For water services, we have created design calculation templates utilizing PTC MathCAD to calculate headloss within the services.  For water system analysis, we utilize H2ONet created by Innovyze to model and analyze our domestic and fire flow demands.


Grading & Erosion Control

Grading & Erosion

SynTier’s services include large- and small-scale grading design; ranging from 20-acre pad sites to individual property grading plans.  Our design services are complimented by our permitting and construction assistance services.  Grading and erosion control projects necessitate significant permits.  Our team has significant experience in the complex permitting of SEPA’s and for the Department of Ecology's Construction Stormwater General Permits. 


SynTier also excels in the understanding of regional stormwater and grading regulations.  Our team of Certified Erosion and Sediment Control Leads (CESCL’s) can monitor and provide guidance on erosion control measures that will keep your project in compliance for various grading and environmental permits. 

Pedestrian ADA Access



SynTier specializes in the analysis of existing ramps for ADA compliance and the design of new ADA pedestrian ramps.  With the proliferation of smart levels, the scrutiny of the construction of ADA compliant ramps and paths has increased, creating the need for more precise designs and construction.  With the rolling hills of the Palouse, our team has experience with the most challenging of sites and are able to design and assist contractors to construct accessible ramps and pathways on all sites.