scholarly journals RUN-OFF ESTIMATION IN STORM SEWER SYSTEM USING EQUIVALENT ROUGHNESS

1963 ◽  
Vol 1963 (91) ◽  
pp. 41-54
Author(s):  
Tomitaro Sueishi
Keyword(s):  
Sewer System ◽  
Run Off ◽  
Storm Sewer

A Conceptual Tank Model for Urban Storm Water System

2013 ◽  
Vol 777 ◽  
pp. 430-433
Author(s):  
Xing Po Liu
Keyword(s):  
Low Impact Development ◽  
Water System ◽  
Storm Water ◽  
Rainfall Runoff ◽  
Sewer System ◽  
Tank Model ◽  
Objective Model ◽  
Principles Of Design ◽  
Urban Storm ◽  
Storm Sewer

In order to cope with urban flooding, water scarcity and rainfall-runoff pollution comprehensively, a conceptual tank model of urban storm water system is proposed. Tank model is a multi-layer, multi-objective model, so design of urban storm water system is more complex than that of urban storm sewer system. Some principles of design of urban storm water system are discussed, such as Low Impact Development, Smart storm water management, and so on.

Stormwater retention basin efficiency regarding micropollutant loads and ecotoxicity

2013 ◽  
Vol 69 (5) ◽  
pp. 974-981 ◽  
Author(s):  
Christel Sébastian ◽  
Sylvie Barraud ◽  
Carolina Gonzalez-Merchan ◽  
Yves Perrodin ◽  
Régis Visiedo
Keyword(s):  
Polybrominated Diphenyl Ethers ◽  
Main Process ◽  
Sewer System ◽  
Run Off ◽  
Micropollutant Removal ◽  
In Situ Experiments ◽  
Retention Basin ◽  
Polycyclic Aromatic ◽  
Stormwater Retention

Retention basin efficiency in micropollutant removal has not been very well studied, in particular for pollutants highlighted by the European Water Framework Directive of 2000 such as pesticides, polybrominated diphenyl ethers (PBDEs) and alkylphenols. This study is based on in situ experiments carried out on a stormwater retention basin with the aim of estimating the basin efficiency in trapping and removing micropollutants from stormwater run-off from an industrial catchment drained by a separate sewer system. Along with stormwater, the basin receives some dry weather effluent flows, which are supposedly non-polluted. Ninety-four substances from five families (metals, polycyclic aromatic hydrocarbons (PAHs), PBDEs, alkylphenols and pesticides) were analyzed during 10 event campaigns in urban wet weather discharges at the inlet and outlet of the basin. The ecotoxicity of the samples was also tested. The results show high inter-event variability in both chemical and ecotoxic characteristics. They indicate good event efficiency concerning heavy metals and most PAHs. The studied pesticides, mainly found in the dissolved fraction, were not trapped. Particulate fraction study highlighted that settling is not the main process explaining micropollutant removal in a retention basin, as was noted for alkylphenols and PBDEs.

scholarly journals Greenroof Study: Final Report An Assessment of Greenroof Design and Maintenance in Portland, Oregon: 2011 – 2013

2016 ◽  
Author(s):  
◽  
Windy Beck ◽  
Keyword(s):  
Data Collection ◽  
Stormwater Management ◽  
Private Property ◽  
Final Report ◽  
Sewer System ◽  
The City ◽  
Term Maintenance ◽  
Storm Sewer

In 1999 the City of Portland (City) began to require that stormwater management facilities (SMF) be built when private property is newly developed or redeveloped (City Code Chapter 17.38). Proper maintenance and upkeep of SMFs is essential to ensuring they function appropriately. The City’s Maintenance Inspection Program (MIP) is tasked with inspecting stormwater management facilities on private properties in order to ensure that they are being properly operated and maintained and to meet provisions of the City’s NPDES Municipal Separated Storm Sewer System (MS4) permit. Greenroofs are one type of SMF that are installed to satisfy this requirement. Understanding the long-term maintenance needs of a greenroof is essential to reaching MIP goals established by City Code and the MS4 permit. Data collection occurred between November 2011 and May 2013 at private properties in Portland, Oregon during routine maintenance inspections of stormwater management facilities for the City’s Maintenance Inspection Program (MIP).

Environmental Factors Affecting Methoprene Concentrations for West Nile Virus Control in a Storm Sewer System

2009 ◽  
Vol 44 (2) ◽  
pp. 141-150 ◽  
Author(s):  
James Y. Li ◽  
Ching Lo ◽  
Peter D. Luciani ◽  
Angelune Des Lauriers ◽  
Kevin Sze ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Sewer System ◽  
West Nile ◽  
Rainfall Events ◽  
Factors Affecting ◽  
Daily Monitoring ◽  
Vector Borne ◽  
Water Volumes ◽  
Number Of Cycles ◽  
Storm Sewer

Abstract To address vector-borne West Nile virus in Canada, chemical larvicides (methoprene) are applied to storm sewer system catch basins (CBs) to control mosquitoes. This study assessed the fate and transport of methoprene in such systems over time relative to precipitation. Rainfall and methoprene concentration patterns revealed the effect of dilution, dissolution, and flushing of the larvicide. In the summer and fall of 2003 to 2005, field monitoring studies were conducted in Toronto, Ontario on two CBs, each treated with a control dose of methoprene, supplied in pellet or ingot formulation. Furthermore, in 2005, concentrations at the storm sewer outfall were measured during nine rainfall events. Based on daily monitoring, findings indicate that (1) the methoprene concentration at the CBs fell below the minimum lethal concentration or LC50 one or two weeks after treatment, and remained below LC50 concentrations over 70% of the time; (2) rainfall flushed methoprene from the CBs to the storm sewer outfall at concentrations higher than the levels specified by Ministry of Environment, which may cause ecosystem damage; (3) based on the number of cycles per diem within each CB in each study period, there was no conclusive pattern in the flushing susceptibility of pellets versus ingots; (4) the mean concentration of methoprene increased with reduced CB sump volume; (5) less total precipitation resulted in higher average methoprene concentrations and a higher number of days above the LC50 based on ingot-dosed CBs; (6) counter-intuitive to (4) and (5), larger sump water volumes and greater rainfall resulted in lower mean concentrations and fewer days above the LC50; and (7) a single ingot dosage was comparable in performance to a three pellet dosage.

MOUSETRAP — A DETERMINISTIC SEWER FLOW QUALITY MODEL

1994 ◽  
Vol 30 (1) ◽  
pp. 107-115 ◽  
Author(s):  
R. Crabtree ◽  
H. Garsdal ◽  
R. Gent ◽  
O. Mark ◽  
J. Dórge
Keyword(s):  
Storm Event ◽  
Storm Events ◽  
Urban Wastewater ◽  
Quality Model ◽  
Short Term ◽  
Sewer System ◽  
Erosion And Deposition ◽  
Run Off ◽  
Flow Quality

Recent research into the behaviour of sediments and associated pollutants in sewers has formed the foundation for a dynamic pollutograph-based sewer flow quality simulation model called MOUSETRAP. This is a new component to the MOUSE sewer system hydraulic modelling package. MOUSETRAP has been developed by an international consortium of sewer model developers and users to predict short term variations in sewer flow quality and sediment transport in response to storm events. MOUSETRAP is composed of a series of modules to represent: the quality of surface run off; sediment and pollutant transport, erosion and deposition within pipes; and the biological and chemical processes within the sewer system. By representing the current understanding of real sewer sediments, this new tool gives the user the capability to simulate storm event pollutographs incorporating first foul flush phenomena. The paper describes the basis of the new MOUSETRAP modules. Results of initial theoretical testing and pilot study applications are presented to illustrate the model's capabilities and potential for use in the management of urban wastewater discharges.

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