Our staff is highly skilled in the technical and non-technical aspects of water resources; hydrology, hydraulics, streambank stabilization, and floodplain management. TAI’s staff has completed all facets of planning, design, permitting, and construction oversight of stormwater projects ranging from simple parcel-scale stormwater Best Management Practices (BMPs) to large scale watershed planning projects.


Hydrology is the analysis of the impacts of different rainfall events on the surrounding land usage. Our staff utilizes historical and trending data to determine the capacities of existing drainage systems to develop recommendations of improvements to the existing system and identification of flood prone areas. These analyses are done internally using the latest methods and programs including Rational Method, SCS, SWMM, HEC HMS among others.


Like hydrology only under pressure.

Control and conveyance of the hydrology of the land usage for the protection of private property. Over the years, hydraulics has evolved from the mindset of out of site, out of mind to Low Impact Developments (LID) in order to encourage the recharge of groundwater aquifers and to remove oils and other Total Suspended Solids (TSS) while increasing vegetative uptake of vital nutrients.

Streambank Stabilization

Over the years it has been identified that hard armor such as concrete, rip-rap, and gabions have proven ineffective in reducing erosion along shorelines, embankments, and outflow structures. The incorporation of sustainable practices, such as native plantings, deep root vegetation, engineered planting structures, and the elimination of well-defined channels has shown potential in controlling erosion while improving conveyance of these areas.

Floodplain Management

Over the years floodplain management has moved towards mitigation and protection resulting from prior urbanization in order to contain and distribute high risk events. Our experienced floodplain managers recognize the protection of property as the highest priority, while enhancing vital aquatic systems.

Regulatory Agencies

Trotter and Associates, Inc. is well respected by regulatory agencies, and is able to readily resolve hurdles associated with permitting. TAI also has an excellent relationship with local permitting municipal engineers and is confident in our ability to expedite the local stormwater application and permit requirements.

  • Lake County SMC
  • McHenry County WDO
  • Kane County Stormwater Management Ordinance
  • DuPage County Stormwater Management Ordinance
  • Will County Stormwater Management Ordinance
  • Kendall County
  • City of Chicago SMO
  • EPA
  • IDNR