Understanding and Solving Complex Water Issues

The distribution and effects of water on the earth’s surface is a fundamental expertise at Hoskin Ryan.  Company founder Paul Hoskin has a Master’s degree in Water Resources and more than 35 years of experience identifying and creatively resolving issues related to water’s effect on the land. Whether examining existing conditions, preparing drainage master plans, or facilitating compliance with regulatory agencies, we create innovative solutions that respect and control the impact water has on the land and the project.

Hoskin Ryan’s Hydrology Group works on a variety of projects, ranging from solutions for small local flooding problems to Area Drainage Master Studies/Plans. Services include storm drain and channel design, hydraulic analysis for natural and engineered systems, hydrologic modeling, floodplain mapping, sedimentation and erosion analysis, detention basin design, FEMA CLOMR/LOMR processing, US Army Corps of Engineers 404 Permit compliance, NPDES and SWPPPs.

Hydrologic/Hydraulic modeling software includes HEC-1, HEC-RAS (steady & un-steady), Flo-2D, SWMM, HEC-6, StormCAD, Haestad Methods, Arc/Info GIS, Geo-RAS and AutoCAD.


  • Storm Drainage Design
  • Floodplain Mapping
  • Hydrologic Modeling
  • Master Drainage and Flood Control Planning
  • Alternative Analysis

Hydrology Projects

Wickenburg Area Drainage Master Study/Plan – Wickenburg, AZ

White Tanks FRS No. 3 Outfall Channel, Preliminary Design – Buckeye, AZ

Goodwin Street Improvement Project – Prescott, AZ

What Our Clients Say About Us