Cost-Estimating Tools for Low-Impact Development Best Management Practices: Challenges, Limitations, and Implications
Publication: Journal of Irrigation and Drainage Engineering
Volume 137, Issue 3
Abstract
Tools were developed for estimating costs of vegetative roofs, rainwater catchment systems, and bioretention facilities. These tools provide a detailed framework to facilitate cost estimation for capital costs, operation and maintenance costs, and life-cycle net present value. The tools can provide users with planning-level cost estimates and serve as a format for cost-reporting for past, current, and future projects. Very little cost data was available in the public forum, and prolific inconsistencies of supporting details were found in the available cost data. To address this, design assumptions were established for each facility type and professionally prepared cost estimates based on these design assumptions were used. Electives in design, such as plant selection and media depth, also greatly affected costs. To make the user aware of these effects, the model separates each option into line items that can be elected or excluded as appropriate. To facilitate collecting future cost data, best management practice (BMP) designers and builders should use these tools to record actual costs and report them to a clearinghouse such as the BMP Database.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 137 • Issue 3 • March 2011
Pages: 183 - 189
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 15, 2009
Accepted: Aug 18, 2010
Published online: Aug 20, 2010
Published in print: Mar 1, 2011
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