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Updated: Feb 7, 2026
13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
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Extending the Rational Method for assessing and developing sustainable urban drainage systems
1State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China; Key Laboratory of Yangtze River Water Environment (Ministry of Education), Tongji University, Shanghai 200092, PR China.
Water Research
|July 20, 2018
Summary
A new Rational Method Prime (RMP) estimates maximum runoff flow rates in urban drainage, accounting for onsite controls. This method improves upon the traditional Rational Method (RM) by dynamically adjusting catchment imperviousness, reducing peak flow rates significantly.
Area of Science:
- Environmental Engineering
- Hydrology
- Urban Planning
Background:
- Onsite runoff controls are crucial for sustainable urban drainage, but accurately estimating peak flow rates remains challenging.
- Traditional Rational Method (RM) is widely used for urban drainage design but cannot effectively handle dynamic changes in catchment imperviousness caused by runoff controls.
Purpose of the Study:
- To develop an improved method, Rational Method Prime (RMP), that integrates the principles of RM with the effects of onsite runoff controls.
- To provide a method that can dynamically recalculate catchment variables and evaluate the efficiency of runoff controls.
Main Methods:
- Developed Rational Method Prime (RMP), an adaptation of the Rational Method (RM).
- RMP recalculates catchment variables considering the dynamic effects of runoff controls.
- Introduced two indices to evaluate the efficiency of runoff controls and analyzed runoff flow rate-rainfall duration curves.
Main Results:
- RMP provides an integrated assessment of the entire catchment, including runoff controls.
- Case studies demonstrated that onsite runoff controls reduced peak flow rates by 5.83% to 91.6%.
- RMP addresses the limitation of the traditional RM by accounting for variable catchment imperviousness.
Conclusions:
- Rational Method Prime (RMP) offers a significant advancement over the traditional Rational Method (RM) for urban drainage design with onsite controls.
- RMP enables better integration of runoff control design with storm sewer design by addressing variable catchment imperviousness.
- The developed method facilitates the evolution from RM 1.0 to RM 2.0, enhancing the accuracy and applicability of runoff flow rate estimations.
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