Case Studies in Collection System Management

Drought and Drought Recovery Conditions on Sewer Flow & Inflow/Infiltration

Friday, April 20
8:50 AM - 9:40 AM
Location: Meeting Room 313, Sacramento Convention Center

CWEA: 1 Contact Hour

Practice Area: Professional Challenge Area: Collection Systems

Inform utility staff and design engineers about the impacts of prolonged droughts and recovery after such droughts on sewer flow quantity. During this session, discuss the most probable locations of collection system deficiencies and high I/I in the recovery period, as learned from different projects during the last winter storm.

Learner Outcomes:

Level: Intermediate; working knowledge of subject matter / journeyman level staff

Nasim Shojaei

Associate Engineer
West Yost Associates


Nasim Shojaei, PE, Ph.D. Candidate has eight years of professional experience in municipal water and wastewater planning and designing. She is currently an Associate Engineer with West Yost Associates and her work focuses on hydraulic model development, calibration, and analysis; infiltration/inflow analysis; flow monitoring; engineering research, risk assessments, and producing master plans. Her publications include:
Multi-Objective Calibration of Reservoirs Water Quality Modeling Using Multi-Objective Particle Swarm Optimization (MPSO), 2012 Water Resource Management (ASCE),
Reservoir Water Quality Model Parameters Estimation Using Particle Swarm Optimization Algorithm, 2013 AWWA,
Automatic Calibration of Water Quality Models for Reservoirs and Lakes, 2014 EWRI.


Send Email for Nasim Shojaei


Jon Wells

Principal Engineer I
West Yost Associates


Jon has 17 years of experience in consulting engineering with a focus on water and wastewater system hydraulic modeling and master planning. Additionally, Jon has experience in developing flow monitoring plans, interpreting and analyzing flow monitoring data, and using
flow monitoring data to develop dry and wet weather flow components for collection systems. Jon’s collection system work, particularly in the Bay Area, has focused on regulatory compliance for wastewater collection systems. His experience includes serving as project manager or project engineer on numerous wastewater master plans, and hydraulic model updates.


Send Email for Jon Wells

Gary Warren

Senior Civil Engineer / Supervisor of Wastewater Design Section


Gary Warren, PE, is a Senior Civil Engineer for the East Bay Municipal Utility District (EBMUD), supervising the Wastewater Engineering Division’s Design Section. This Section performs in-house design work for the Wastewater Department’s capital improvement projects. Projects include treatment plant, collection system and recycled water system upgrades and rehabilitation. Gary has been very involved with EBMUD’s innovative resource recovery and co-digestion program, which allows their treatment plant to produce typically 130% of the power needed to operate the plant. Gary has a BS in chemical engineering from UC Santa Barbara and 30 years of experience. Prior to working for the District, he also worked for CH2M HILL (now part of Jacobs) and Metcalf & Eddy (now part of AECOM). He is also very active in CWEA, currently serving on the board of the local SF Bay Section.


Send Email for Gary Warren


Drought and Drought Recovery Conditions on Sewer Flow & Inflow/Infiltration


Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for Drought and Drought Recovery Conditions on Sewer Flow & Inflow/Infiltration