Integrating Structural Resilience in the Design of Urban Drainage Networks in Flat Areas Using a Simplified Multi-Objective Optimization Framework

Abstract

Structural resilience describes urban drainage systems’ (UDSs) ability to minimize the frequency and magnitude of failure due to common structural issues such as pipe clogging and cracking or pump failure. Structural resilience is often neglected in the design of UDSs. The current literature supports structural decentralization as a way to introduce structural resilience into UDSs. Although there are promising methods in the literature for generating and optimizing decentralized separate stormwater collection systems, incorporating hydraulic simulations in unsteady flow, these approaches sometimes require high computational effort, especially for flat areas. This may hamper their integration into ordinary commercially designed UDS software due to their predominantly scientific purposes. As a response, this paper introduces simplified cost and structural resilience indices that can be used as heuristic parameters for optimizing the UDS layout. These indices only use graph connectivity information, which is computationally much less expensive than hydraulic simulation. The use of simplified objective functions significantly simplifies the feasible search space and reduces blind searches by optimization. To demonstrate the application and advantages of the proposed model, a real case study in the southwest city of Ahvaz, Iran was explored. The proposed framework was proven to be promising for reducing the computational effort and for delivering realistic cost-wise and resilient UDSs.

The Applications of Graph Algorithms to Modeling of Integrated Urban Water Management System

“…Examples of graphs 𝐵𝐵 -matrix so that the upper manholes are placed in Column 𝑁𝑁𝑁𝑁 + 1 and the lower ones are placed in Column 𝑁𝑁𝑁𝑁 + 2 . It is worth noting that each input data set and position of the outlet often imply a possible directed tree using this methodology [30][31][32].…”

“…The process may be repeated till all feasible roots (and all feasible connections) are contained in the ultimate setup. The last stage is to use all the modifi cations in the actual setup within the base graph [31][32][33].…”

Toward Decentralised Sanitary Sewage Collection Systems: A Multiobjective Approach for Cost-Effective and Resilient Designs

“…The maximum structural resilience is obtained when clogging in the sewers has the least effect on the upstream parts [42]. To quantify the clogging consequence in sewer networks, [12] proposed a criterion, Equation (4), which uses layout design properties. The principle is that the lower the proportion of the population affected by sewer clogging, the more resilient the network will be.…”

Evaluation of Combined Sewer System Operation Strategies Based on Highly Resolved Online Data

“…In recent years, mathematical optimization techniques have been exploited broadly to aid these decision-making procedures by assessing the performance of different alternatives [18][19][20]. These techniques' applications include the optimal planning and design of urban drainage systems (UDSs) (e.g., [21][22][23][24][25]) optimal UDS retrofitting and rehabilitation strategies (e.g., [26][27][28][29][30][31][32][33][34]), and optimizing control and the operation of UDSs (e.g., [35][36][37][38][39][40]). As the main domain of the present study is optimizing the operation of UDSs, in the following paragraphs we review previous studies in this field.…”