Estimating effective impervious area in urban watersheds using land cover, soil character and asymptotic curve number

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9 Scopus citations

Abstract

Knowledge of the effective impervious area (EIA) or the degree to which impervious surfaces are hydraulically connected to the drainage system is useful for improving hydrological and environmental models and assessing the effectiveness of green stormwater infrastructure in urban watersheds. The goal of this research is to develop a method to estimate EIA fraction in urban watersheds using readily available data. Since EIA is dependent on rainfall–runoff response and cannot be solely determined based on the physical characteristics of a watershed, the EIA is linked with the asymptotic curve number (CN), a watershed index that represents runoff characteristics. In order for the method to be applicable to ungauged watersheds, the asymptotic CN is predicted using land cover and soil data from 35 urban catchments in Minnesota and Texas, USA. Similar data from 11 other urban catchments in Wisconsin and Texas, USA, are used to validate the results. A set of runoff depth versus EIA fraction curves is also developed to assess the impact of EIA reduction on discharge from an urban watershed in land-use planning studies.

Original languageEnglish (US)
Pages (from-to)513-526
Number of pages14
JournalHydrological Sciences Journal
Volume63
Issue number4
DOIs
StatePublished - Mar 12 2018

Bibliographical note

Funding Information:
This research was funded by the Minnesota Local Road Research Board.

Publisher Copyright:
© 2018 IAHS.

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

  • effective impervious area
  • impervious area
  • rainfall
  • runoff
  • stormwater
  • ungauged watersheds
  • urban catchments
  • urban watersheds

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