Effect of Pipe Roughness on Optimal Sewer Networks with Drop Manholes in Steep Terrains
Publication: Journal of Water Resources Planning and Management
Volume 150, Issue 11
Abstract
The present work aims to investigate the effect of pipe roughness on the construction cost of sewer networks in steep terrains. To achieve this objective, a sensitivity analysis was performed, wherein a sewer network was designed with different pipe roughnesses and varying terrain slopes to simulate four distinct steep terrains. In addition, this study considers the effect of new pipes with very high roughnesses that have appeared on the market in recent years, evaluating their influence on sewer network design and construction cost in steep terrains. The sewer networks were designed using an existing methodology for an optimal design that includes drop manholes if required to meet all the hydraulic constraints. The effect of pipe roughness was tested in two sewer networks from distinct sectors of Bogotá, Colombia.
Practical Applications
This study has relevance when considering its ability to lead to the expansion of the sewer service, particularly in hilly regions. The use of higher roughness pipes as a result of this finding has a direct impact on reducing the need for drop manholes, leading to a significant reduction in associated costs. This reduction in costs is of paramount importance in the viability and execution of sewer projects in communities facing significant financial constraints. By minimizing costs, this approach not only optimizes project efficiency but also facilitates access to basic sanitation services in geographic areas previously considered difficult to address. Consequently, this research not only improves sewer systems but also contributes to community development.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Information on the sewer networks used as case studies can be found in the Supplemental Materials. This information includes the coordinates, ground elevation, and inflow for each manhole.
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© 2024 American Society of Civil Engineers.
History
Received: Dec 5, 2023
Accepted: May 20, 2024
Published online: Sep 11, 2024
Published in print: Nov 1, 2024
Discussion open until: Feb 11, 2025
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