Optimal’s team has strong leadership is mobile, responsive, talented and enjoys a collaborative culture. Our flexible workforce is supported by key sub-consultants, suppliers and dedicated sub-contractors with like goals for our industry.

Murray Powell

Murray Powell

Managing Director Principal Auditor
Ben Wolfgramm

Ben Wolfgramm

Business Development & Projects
Dr. Guy Amos

Dr. Guy Amos

Civil, Environmental & Waterways Engineer & QA Manager
Hugh Williamson

Hugh Williamson

Design Manager & Construction Manager
Phil Li

Phil Li

Civil & Water Engineer
Sujana Bajracharya

Sujana Bajracharya

Drafting & Documentation Manager
Dihn Tran

Dihn Tran

Senior Design Drafting
Omid Sayar

Omid Sayar

Manager - Process & Operation Engineering
Leila Faghihi

Leila Faghihi

Environmental Engineer
Richard Selway

Richard Selway

Operation and Maintenance - Electrical Services
Sash Nasiri

Sash Nasiri

Operation and Maintenance - Electrical Engineer
Oscar Bentham

Oscar Bentham

Civil & Environmental Engineer
Daniel Rhodes

Daniel Rhodes

Civil & Water Engineer
Mahdi Madani

Mahdi Madani

Process & Operations Engineer
Hamid Mehrazmay

Hamid Mehrazmay

Process & Operations Engineer
Saeed Javan

Saeed Javan

Process & Operations Engineer
Arman Rashidi

Arman Rashidi

Process & Operations Engineer
Murray Powell
Murray Powell
Managing Director Principal Auditor

Bachelor of Chemical Engineering & Masters in Business Administration

Murray has dedicated his career to the advancement of the stormwater industry. Murray has a deep commitment to protection of the environment and his passion for improved stormwater management is relentless.

Murray spent his early career with the NSW EPA as a stormwater compliance officer auditing industrial facilities. Following this he joined CDS Technologies as business development manager. This role provided Murray with a platform to embark on an outstanding career in the industry. Following transitional roles with Rocla Pipeline Products and consultants Hugh Trumen Murray was invited to form Optimal Stormwater in 2009.

Murray has skills and experience in all facets of stormwater management, with specialist expertise in stormwater treatment, auditing and stormwater harvesting. He has been involved with the sizing, siting and design of almost thousands of GPTs both locally and internationally. He has developed new models of gross pollution traps, trash racks and stormwater harvesting off takes.

He has mentored practitioners and designers internationally in all aspects of GPT design, and has a comprehensive knowledge of all GPTs available in Australia. He has written GPT design guidelines for several Councils, and presented several technical papers on multiple aspects of stormwater treatment.

Murray has been involved in over 40 stormwater harvesting systems, including investigations, feasibility studies, concept design and detail design, to construction and also operation.

Ben Wolfgramm
Ben Wolfgramm
Business Development & Projects

Ben has over 20 years of experience in the stormwater industry. Ben joined Optimal in January 2015 after 6.5 years with Storm Consulting and prior to that 6 years with CDS Technologies and Rocla Pipeline Products. Ben is an accomplished water and urban stormwater practitioner and has lead iconic WSUD strategies for projects such as Barangaroo, Sydney Olympic Park and Green Square.

Ben has delivered numerous waterway restoration projects, master plans, pond and wetlands, gross pollution traps, flood studies and stormwater harvesting. Ben is a highly capable design and project manager with excellent communication and negotiation skills. Ben continues to contribute to the stormwater industry through the Stormwater Industry Association.

Dr. Guy Amos
Dr. Guy Amos
Civil, Environmental & Waterways Engineer & QA Manager

BE Civil & MS Environmental Engineering. PhD Water Resources Management

Guy is new to Optimal Stormwater, joining in April 2016 after 15 years in local government where he was Stormwater & Waterways Manager for the southern Sydney suburb of Sutherland Shire, the second largest council in NSW.

Under his direction his team was responsible for delivering stormwater management services, which included: new capital works; maintenance; forward planning; asset management; floodplain/estuary management; watercourse management; policy development and customer service.

As manager, Guy constructed a large number of varied stormwater quality improvement projects and was responsible for managing almost 300 across the Shire. Guy brings a wealth of skill and knowledge in working with local government, understanding the policies and practices. His expertise in project management enable him to coordinate and deliver sustainable solutions to the client on-time and within budget.

Guy originally from the United States earned his BE and MS, before coming to Australia in early 1990s. He completed a doctorate under Professor John Argue of the Urban Water Resources Centre, University of South Australia. Guy developed a ‘best practice’ water management strategy for Portland Aluminium (ALCOA), VIC, which at the time was the single largest earner of export dollars in Australia.

Hugh Williamson
Hugh Williamson
Design Manager & Construction Manager

Hugh is a diligent and passionate environmental engineer and enjoys working on projects with positive environmental and sustainability outcomes. He is dedicated to delivery of high quality design and construction. Hugh has excellent communication with clients and provides clients the best service.

Hugh is competent with all modelling tools including MUSIC, DRAINS, HECRAS, TuFlow and drafting in CAD.

Hugh graduated in 2011 from RMIT University in environmental engineering and worked at Melbourne Water as project & investigation engineer in the flood mapping and mitigation and land development teams from 2011 to 2013.

He has previously worked in local government in the capital works and assets planning investigations director of engineering for Ernest landscaping based in Melbourne’s western suburbs.

Hugh has published 3 papers on the topic of ‘stream daylighting’ and 1 paper on stormwater harvesting design in Wonthaggi for a combined Optimal Stormwater & Bass Coast Shire Council Project.

Phil Li
Phil Li
Civil & Water Engineer

Phil is a Civil & Water Engineer at Optimal Stormwater with a strong academic background. He has experience in DRAINS, HEC-RAS, MUSIC and many other modelling programs. He works on different WSUD, drainage, OSD and flood modelling designs. His experience in Universities provides an excellent overall view of Australian Rainfall and Runoff in both quantity and quality.

Since joining Optimal Stormwater, Phil has worked managing multiple stormwater quality and stormwater harvesting projects, including GPT installations, wetland rectifications and design and construction of stormwater harvesting projects.

Phil also gained field experiences of waste treatment by involved into the operation and maintenance of sewer mining schemes.

Sujana Bajracharya
Sujana Bajracharya
Drafting & Documentation Manager

Diploma of Civil Engineering Masters of Professional Accounting

Sujana is a credit to the Optimal team and has been working as a civil, structural and water drafter for 10 years and as a drafting manager for 5 years. She has worked on large hydropower plants in Nepal, small, medium and large scale architectural projects in Sydney and gross pollutant traps for Rocla all over Australia.

Sujana previously undertook the design and drafting of stormwater quality treatment devices and her initials are still on the Rocla standard drawings. She has significant experience in using AutoCAD, Revit and Microsoft excel. She has meticulous attention to detail and is a very welcome and excellent addition to the Optimal Stormwater team. Sujana is competent in DRAINS, CAD, HECRAS

Dihn Tran
Dihn Tran
Senior Design Drafting

Dihn is Optimal Stormwater’s senior civil design drafter. Dihn has excellent skills and has prepared documentation for stormwater quality treatment devices, stormwater harvesting designs, potable water mains, sewer reticulation mains and civil works. He is an excellent worker in the Optimal Stormwater drafting team and is now picking up design elements.

Omid Sayar
Omid Sayar
Manager - Process & Operation Engineering

BE – Chemical & Process Engineering. Masters in Environmental Engineering (Water & Wastewater Treatment) at UNSW & UTS

Omid is Operation and Maintenance Manager for Optimal Stormwater. Omid is operating 25 stormwater, rainwater and groundwater harvesting throughout NSW for Optimal. Key clients include Mosman Council, City of Sydney, North Sydney.

He has a unique combination of academic qualifications plus field & operational experience. This has led to considerable operations and process understanding and practical design skills.

Omid has invaluable process and treatment expertise in all aspect of stormwater, water and wastewater and has undertaken several optimisation studies of various treatment plants around Australia. These projects comprise the latest technologies for wastewater recycling including, membrane bioreactors, ultra-filtration and UV disinfection

Omid is enjoys employing lessons learned and skills in the more mature water industry and using them to better equip, operate and deliver operation and maintenance for stormwater harvesting projects..

We have 3 chemical engineers working at Optimal Stormwater providing surety so client can be confident operate stormwater harvesting operations. Omid will assist in the optimisation planning for sustainable water infrastructure and ensure that on-going costs are kept as low as possible and water quality requirements are met.

Leila Faghihi
Leila Faghihi
Environmental Engineer
Richard Selway
Richard Selway
Operation and Maintenance - Electrical Services

Richard is supports our operation and maintenance team and has over 30 years experience as is a certified electrician.

Sash Nasiri
Sash Nasiri
Operation and Maintenance - Electrical Engineer

Sash is a dynamic & experienced Field Service Engineer with more than 10 years valuable experience gained from various industrial fields such as oil refineries and water & wastewater treatment plants. He is specialized in troubleshooting, preventative maintenance scheduling and implementing, D&C, testing and commissioning of various industrial equipment. Sash has outstanding control experience in PLC, HMI and SCADA programming.

Oscar Bentham
Oscar Bentham
Civil & Environmental Engineer
Daniel Rhodes
Daniel Rhodes
Civil & Water Engineer
Mahdi Madani
Mahdi Madani
Process & Operations Engineer
Hamid Mehrazmay
Hamid Mehrazmay
Process & Operations Engineer
Saeed Javan
Saeed Javan
Process & Operations Engineer
Arman Rashidi
Arman Rashidi
Process & Operations Engineer