AbstractsEngineering

Numerical hydraulic modeling of urban waste water collecting systems

by Stanislas Genty




Institution: KTH Royal Institute of Technology
Department:
Year: 2014
Keywords: Urban hydraulics / Hydraulic modeling / Corrective Action Plan / Combined sewer overflow / Infiltration; Engineering and Technology; Teknik och teknologier; Engineering and Technology; Civil Engineering; Teknik och teknologier; Samhällsbyggnadsteknik; Engineering and Technology; Civil Engineering; Water Engineering; Teknik och teknologier; Samhällsbyggnadsteknik; Vattenteknik; Teknologie masterexamen - Vattensystemteknik; Degree of Master - Water System Technology; Water Resources Engineering; Vattenvårdsteknik
Record ID: 1334408
Full text PDF: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145044


Abstract

Urban waste water collecting systems are designed to convey domestic, industrial and storm water. When sizing sewer network, heavy rainfall must be considered to provide the needed hydraulic capacity for collection. Maintenance is also required in order to avoid anomalies such as inflow, infiltration and unusual polluted discharges from Combined Sewer Overflows (CSOs). Inflow and infiltration decrease the treatment yield at the Waste water Treatment Plant (WWTP) and participate in hydraulic overloads and overflows. CSOs have a direct impact on the pollution of water bodies and must be strictly sized and monitored. Detecting sizing and maintenance anomalies is crucial to ensure public health and a good status of our natural environment. Today, numerical hydraulic models support consulting engineers in assessing overflows then in choosing the best technical and cost-effective scenario. The objectives of this paper are to review the dysfunctions of collecting system and to understand how a numerical hydraulic model is constructed, calibrated and then used to establish a Corrective Action Plan (CAP). My master thesis is based on a working project achieved at SAFEGE (Group SUEZ Environnement) in the Urban Hydraulics Department in Lyon (Rhône-Alpes, France) between September 2013 and February 2014. The paper will present some outcomes obtained from an Urban Hydraulic Project at Chazelles-sur-Lyon (Rhône-Alpes, France) in the South West of Lyon. Mike Urban is the software - developed by the company DHI Water- used for the numerical hydraulic modeling.