Preprints
https://doi.org/10.5194/hess-2021-32
https://doi.org/10.5194/hess-2021-32

  29 Jan 2021

29 Jan 2021

Review status: this preprint was under review for the journal HESS but the revision was not accepted.

Can the implementation of Low Impact Development reduce basin runoff?

Xinxin Sui1,2 and Frans van de Ven2,3 Xinxin Sui and Frans van de Ven
  • 1Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CD Delft, the Netherlands
  • 2Department of Civil and Environmental Engineering, National University of Singapore, 117576 Singapore, Singapore
  • 3Deltares, 2629 HV Delft, the Netherlands

Abstract. Low impact development (LID) was promoted as an alternative to conventional urban drainage methods. The effects of LID at site or urban scales have been widely evaluated. This project aims to investigate the impact of LID implementation on basin runoff at regional scale in a half urbanized catchment; especially the overlap of urban and rural sub-flows at peak times is concerned. A SUPERFLEX conceptual model framework was adapted as a semi-distributed model to simulate the rainfall-runoff relationship in the catchment for San Antonio, Texas as a case study. Scenario analyses of both urban development and LID implementation were conducted. Results show that (1) the infill urban development strategy benefits more from runoff control than the sprawl urban development strategy; (2) in non-flood season permeable pavements, bioretention cells, and vegetated swales decrease peak runoff forcefully and permeable pavements, bioretention cells, and green roofs are good at runoff volume retention; (3) contrary to the general opinion about the peak reduction effect of LID, for partly urbanized, partly rural basins and extremely wet conditions, the implementation of LID practices delays urban peak runoff and may cause stacking of rural and urban sub-flows, leading to larger basin peaks.

Xinxin Sui and Frans van de Ven

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-32', Konstantinos Soulis, 25 Feb 2021
    • CC1: 'Reply on RC1', Xinxin Sui, 22 Mar 2021
    • AC2: 'Reply on RC1', Frans van de Ven, 20 Jul 2021
  • RC2: 'Comment on hess-2021-32', Anonymous Referee #2, 29 Jun 2021
    • AC1: 'Reply on RC2', Frans van de Ven, 20 Jul 2021
  • EC1: 'Comment on hess-2021-32', Fabrizio Fenicia, 28 Jul 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-32', Konstantinos Soulis, 25 Feb 2021
    • CC1: 'Reply on RC1', Xinxin Sui, 22 Mar 2021
    • AC2: 'Reply on RC1', Frans van de Ven, 20 Jul 2021
  • RC2: 'Comment on hess-2021-32', Anonymous Referee #2, 29 Jun 2021
    • AC1: 'Reply on RC2', Frans van de Ven, 20 Jul 2021
  • EC1: 'Comment on hess-2021-32', Fabrizio Fenicia, 28 Jul 2021

Xinxin Sui and Frans van de Ven

Xinxin Sui and Frans van de Ven

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Short summary
Implementation of LID (low impact development) practices is promoted to reduce problematic peak flows in urban runoff. This attenuation can however lead to stacking of runoff peaks from the urban and rural part of the drainage basin, leading to higher flood peaks further downstream. This problem is investigated for different urbanization strategies and LID scenarios in a case study in San Antonio, using an adapted SUPERFLEX hydrological model. Stacking is a risk that is to be considered.