Rocio Peralta, P.E., Principal
Hydraulic Engineer
MP Stormwater Engineering LLC, East Olympia, Washington
PROFILE:
MP Stormwater Engineering LLC was formed as a consulting firm specializing in hydraulic
engineering services. The firm’s focus is to provide surface water management designs
including storm water, river mechanics, scour, backwater analysis, and fish passage designs. MP
Stormwater Engineering also performs quality assurance reviews of hydraulic reports, training
and surface water design manual maintenance. The owners of MP Stormwater Engineering LLC
are Rocio Peralta and Glorilyn Maw and have 34 years of combined experience.
EMPLOYMENT HISTORY
MP STORMWATER ENGINEERING LLC
Owner (2008-Present)
Provide engineering services to clients in the following areas of expertise: Stormwater
Management, River Mechanics, Scour Analysis, River Backwater Analysis, Fish Passage
Design, Hydraulic Report Review, Training, and Manual Maintenance.
EXELTECH CONSULTING INC.
Temporary Hydraulic Engineer (2008-2009)
Provided a technical hydraulic report on the Nisqually River Trestle Bridge Replacement for the
City of Tacoma, and also was on a disciplinary team for a Mason County roadway improvement
project, Simmons Road Improvement for stormwater and hydraulic design.
WASHINGTON STATE DEPARTMENT OF TRANSPORTATION
Hydraulic Engineer (1998-2008)
 Hydrology and Hydraulics: Work with contour mapping to determine drainage basin area, use
USGS regression formulas to determine peak flows, serve as staff specialist in Single Event and
Continuous Simulation software to design complex applications for water quality and water
quantity design. Provided training with Stormshed software and the basic Hydraulic and
Hydrology class on these concepts.
 Stormwater:
Provide guidance and policy changes for hydrology modeling issue for
Washington with the re-write of the Highway Runoff Manual. Responsible in the development
of a continuous simulation program for Western Washington (MGSFlood). Assist project office
with complex storm water design facilities. Provided training with the HRM guidance.
 Bridge
Scour Monitor Program: Predicted scour depths at bridges, intermediate pier locations,
and bridge span lengths. Identified scour critical bridges on existing highways systems and made
recommendations for repairs or monitoring these structures during time of flooding.
 River
Mechanics and Bioengineering: Perform energy analysis on rivers, design energy
dissipation barbs, drop structures and perform momentum analysis on scouring rivers or bridge
sites. Team member on the Intergrated Stream Bank Protection to provide training with the
Washington Department of Fisheries. Task Manager for research project at Washington State
University for Barb design.
 River
Backwater Analysis: Perform HEC2 and HECRAS river backwater analysis for river
channels and simple to complex bridge configurations. Provide recommendation to the bridge
design office on new bridge replacement projects.
 Structural
Design/Fish Passage: Perform structural design and review of culverts, corrugated
metal arches and boxes, 3-sided concrete bridges, and fish passage structures.
EDUCATION:
Gonzaga University / Bachelor of Science in Civil Engineering / 1993
PROFESSIONAL REGISTRATION:
Professional Engineer – Washington State - 1999
MWBE Certification #M6F6421271 - 2010
PROJECT EXPERIENCE:
MGSFlood Software Training
MGS Software hired MP Stormwater Engineering to teach several of the MGSFlood training
classes held throughout western Washington. MGSFlood is a continuous simulation hydrologic
model used in transportation projects to quantify stormwater runoff and design stormwater
management facilities for flow control and runoff treatment. Specific examples in the class
include how to design ponds, bioretention cells, infiltration facilities, and compost amended
vegetated filter strips. Additional guidance was provided to those in need of importing
MGSFlood data into Hydrostats. Designers from Seattle Public Utilities, Pierce County,
Washington State Department of Transportation and numerous private consultants have attended
these classes. MGS Software, Bruce Barker, 253-841-1573
Simmons Road Improvement
The Simmons Road Improvement Project was located in Mason County. This project would
provide a bypass from SE Lynch Road to SE Old Olympic Highway and intersection
improvements on SE Lynch Road and SE Old Olympic Highway to improve traffic safety at the
intersection of Highway 101 and SE Lynch Road. Prior to her time with MP Stormwater, Rose
Peralta was responsible for the Final Hydraulic and Stormwater Report that included hydrologic
basin analysis based on both hydraulic conveyance design for closed stormsewer system and
stormwater engineering for runoff treatment and flow control facilities to adhere to the
applicable guidelines. Exeltech, Roger Horton, 360-357-8289
Treasure Island Bridge Replacement
Treasure Island Country Club hired Exeltech Consulting Inc. to replace the existing Treasure
Island Bridge that crosses Case Inlet passage with a new bridge. MP Stormwater Engineering
was responsible for providing the Final Hydraulic Report. Drainage design for the bridge deck
was completed along with addressing the stormwater management requirements for runoff
treatment and flow control based on the Department of Ecology Stormwater Management
Manual for Western Washington. Although flow control exemption was granted for the bridge,
runoff treatment was required and located at bridge ends. Bridge hydraulic modeling based on
site inspections and field survey was conducted to establish the proposed tidal water surface
elevation and estimate scour depths. Exeltech, Karl Kirker, 360-357-8289