scholarly journals Probabilistic Modelling of Sustainable Urban Drainage Systems

2022 ◽  
Author(s):  
Anita Raimondi ◽  
Maria Gloria Di Chiano ◽  
Mariana Marchioni ◽  
Umberto Sanfilippo ◽  
Gianfranco Becciu
Keyword(s):  
Control Systems ◽  
Probabilistic Approach ◽  
Urban Drainage ◽  
Rainfall Events ◽  
Drainage Systems ◽  
Effective Strategies ◽  
Urban Drainage Systems ◽  
Rainwater Management ◽  
A Chain ◽  
And Control

Abstract Sustainable Urban Drainage Systems (SuDS) gatherer effective strategies and control systems for stormwater management especially in highly urbanized areas characterized by large impervious surfaces that increase runoff peak flow and volume. The main goal is to restore the natural water balance by increasing infiltration, evapotranspiration and promoting rainwater reuse. This paper proposes an analytical probabilistic approach for the modelling SuDS applicable to different structures and goals. Developed equations allow to estimate the probability of overflow and the probability of pre-filling at the end of dry periods, to evaluate the efficiency of the storage in rainwater management and its ability to empty between consecutive events. A great advantage of the proposed method is that it allows to consider a chain of rainfall events; this aspect is particularly important for control systems SuDS characterized by low outflow rates which storage capacity is often not completely available at the end of a dry period because pre-filled by previous events. Suggested formulas were tested to two cases studies in Milan and Genoa, Italy.

Accounting for sensor calibration, concentration heterogeneity, measurement and sampling uncertainties in monitoring urban drainage systems

2003 ◽  
Vol 47 (2) ◽  
pp. 95-102 ◽  
Author(s):  
J.-L. Bertrand-Krajewski ◽  
J.-P. Bardin ◽  
M. Mourad ◽  
Y. Béranger
Keyword(s):  
Performance Indicator ◽  
Sensor Calibration ◽  
Urban Drainage ◽  
Experimental Conditions ◽  
Flow Rates ◽  
Rainfall Events ◽  
Drainage Systems ◽  
Methods And Techniques ◽  
Urban Drainage Systems ◽  
Online Measurements

Assessing the functioning and the performance of urban drainage systems on both rainfall event and yearly time scales is usually based on online measurements of flow rates and on samples of influent and effluent for some rainfall events per year. In order to draw pertinent scientific and operational conclusions from the measurement results, it is absolutely necessary to use appropriate methods and techniques in order to i) calibrate sensors and analytical methods, ii) validate raw data, iii) evaluate measurement uncertainties, iv) evaluate the number of rainfall events to sample per year in order to determine performance indicator with a given uncertainty. Based on previous work, the paper gives a synthetic review of required methods and techniques, and illustrates their application to storage and settling tanks. Experiments show that, despite controlled and careful experimental conditions, relative uncertainties are about 20% for flow rates in sewer pipes, 6-10% for volumes, 25-35% for TSS concentrations and loads, and 18-276% for TSS removal rates. In order to evaluate the annual pollutant interception efficiency of storage and settling tanks with a given uncertainty, efforts should first be devoted to decrease the sampling uncertainty by increasing the number of sampled events.

scholarly journals A systematic review of wastewater monitoring and its applications in urban drainage systems

Respuestas ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 54-64
Author(s):  
Carlos Alexis Bonilla Granados ◽  
Juan Camilo Barrera Triviño ◽  
Gonzalo Cifuentes Ospina
Keyword(s):  
Physicochemical Characteristics ◽  
Research Strategy ◽  
Free Access ◽  
Urban Drainage ◽  
Monitoring And Control ◽  
Drainage Systems ◽  
Documentary Sources ◽  
Urban Drainage Systems ◽  
Maximum Flows ◽  
And Control

Urban drainage systems have an important role in the planning and development of cities, they allow a good management of the wastewater flow, and their study is important to understand the physicochemical characteristics of water and the relationships between the maximum flows and means of each system. This is a review of wastewater monitoring and their applications, which is done through the consultation of databases and other documentary sources of free access like scientific journals. The research strategy was based on 3 thematic axes that were: monitoring of wastewater, obtaining parameters of the system and network management. We reviewed 69 references of different countries around the world countries and we focused in the methodologies used in each study case. In conclusion, we highlight the importance of implementation of measure instruments, monitoring and control systems.

Sediment and pollutant load modelling using an integrated urban drainage modelling toolbox: an application of City Drain

2010 ◽  
Vol 61 (9) ◽  
pp. 2273-2282 ◽  
Author(s):  
J. P. Rodríguez ◽  
S. Achleitner ◽  
M. Möderl ◽  
W. Rauch ◽  
Č. Maksimović ◽  
...  
Keyword(s):  
Computational Modelling ◽  
Integrated Modelling ◽  
Research Centre ◽  
Urban Drainage ◽  
Rainfall Events ◽  
Drainage Systems ◽  
Engineering Research ◽  
Planning And Design ◽  
Urban Drainage Systems ◽  
Accumulation Of Pollutants

Numerical and computational modelling of flow and pollutant dynamics in urban drainage systems is becoming more and more integral to planning and design. The main aim of integrated flow and pollutant models is to quantify the efficiency of different measures at reducing the amount of pollutants discharged into receiving water bodies and minimise the consequent negative water quality impact. The open source toolbox CITY DRAIN developed in the Matlab/Simulink© environment, which was designed for integrated modelling of urban drainage systems, is used in this work. The goal in this study was to implement and test computational routines for representing sediment and pollutant loads in order to evaluate catchment surface pollution. Tested models estimate the accumulation, erosion and transport of pollutants—aggregately—on urban surfaces and in sewers. The toolbox now includes mathematical formulations for accumulation of pollutants during dry weather period and their wash-off during rainfall events. The experimental data acquired in a previous research project carried out by the Environmental Engineering Research Centre (CIIA) at the Universidad de los Andes in Bogotá (Colombia) was used for the calibration of the models. Different numerical approaches were tested for their ability to calibrate to the sediment transport conditions. Initial results indicate, when there is more than one peak during the rainfall event duration, wash-off processes probably can be better represented using a model based on the flow instead of the rainfall intensity. Additionally, it was observed that using more detailed models (compared with an instantaneous approach) for representing pollutant accumulation do not necessarily lead to better results.

scholarly journals Vegetation Survival in Green Roofs without Irrigation

2020 ◽  
Author(s):  
Anita Raimondi ◽  
Mariana Marchioni ◽  
Umberto Sanfilippo ◽  
Gianfranco Becciu
Keyword(s):  
Storage Capacity ◽  
Irrigation System ◽  
Probabilistic Approach ◽  
Green Roofs ◽  
Design Parameters ◽  
Urban Drainage ◽  
Rainfall Events ◽  
Peak Runoff ◽  
A Chain

The Sustainable Urban Drainage Systems on stormwater management provide benefits for sewer networks, treatment plants and environment and should be encouraged. Green roofs are part of these systems and can contribute both to delay and cut peak runoff and reduce discharged volumes. In this paper the probability of vegetation survival without irrigation has been proposed as a guide to operators on selecting vegetation and irrigation system as well as design parameters. An analytical probabilistic approach has been proposed; a chain of consecutive rainfall events has been considered to take into account the possibility that storage capacity is not completely available at the beginning of the considered event but pre-filled from previous rainfalls, as typical of green roofs. Finally, an application to a case study has been proposed to validate proposed equations.

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