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Using Annual Hydrographs to Determine Effective Impervious Area

Troy Jones, Chris Johnston and Craig Kipkie (2003)
Kerr Wood Leidal Associates Ltd.
DOI: https://doi.org/10.14796/JWMM.R215-14
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Abstract

Reducing the amount of directly connected impervious areas improves watercourse health and increases the potential for sustainable fish communities in streams. It also reduces the impacts of frequently-occurring rainfall-runoff events, and shifts watercourse hydrology closer to pre-development conditions. There is increasing focus on low impact development (LID) strategies as a means of improving watercourse health. Accurately determining the reduction of effective impervious area (EIA) has become crucial for assessing the effectiveness of these strategies. Quantifying EIA is also essential in developing and calibrating hydrologic models. In addition, it is important to test the effectiveness of LID strategies over the entire year, to take into account the large variability in antecedent conditions. Continuous simulation models focus on all events throughout the year, and not just a large design event.

Although several methods exist for measuring EIA, they tend to overestimate the effectiveness of LID strategies in wet climates when soils are saturated for a significant portion of the year. An annual hydrograph method is proposed to determine EIA. This involves using existing gauged creek systems and rainfall records from rainfall gauging networks. This enables the use of available data to determine a watershed’s response to rainfall throughout the year, and thereby compute a year-round EIA. The results of this type of analysis will help to assess the effect of implementing LID strategies for existing or proposed developments, particularly for areas with wet climates.

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PAPER INFO

Identification

CHI ref #: R215-14 956
Volume: 11
DOI: https://doi.org/10.14796/JWMM.R215-14
Cite as: CHI JWMM 2003;R215-14

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2003

Status

# reviewers: 2
Version: Final published

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© 2003 CHI. Some rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

The Journal of Water Management Modeling is an open-access (OA) publication. Open access means that articles and papers are available without barriers to all who could benefit from them. Practically speaking, all published works will be available to a worldwide audience, free, immediately on publication. As such, JWMM can be considered a Diamond, Gratis OA journal.

All papers published in the JWMM are licensed under a Creative Commons Attribution 4.0 International License (CC BY).

JWMM content can be downloaded, printed, copied, distributed, and linked-to, when providing full attribution to both the author/s and JWMM.


AUTHORS

Troy Jones

Kerr Wood Leidal Associates Ltd., North Vancouver, BC, Canada
ORCiD:

Chris Johnston

Kerr Wood Leidal Associates Ltd., Burnaby, BC, Canada
ORCiD:

Craig Kipkie

Kerr Wood Leidal Associates Ltd., Burnaby, BC, Canada
ORCiD:


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