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Title	COST-EFFECTIVE ROADWAY DRAINAGE DESIGN USING ECONOMIC ANALYSIS. PHASE II FINAL REPORT
Accession No	00496586
Authors	Young, G K; WALKER, S
Period Covered	860300-8709
Corp. Authors / Publisher	GKY & Associates, Incorporated ; Federal Highway Administration
Publication Date	19900300
Description	55 p.; Appendices(3); Figures(15); References(16); Tables(11)
Abstract	A practical method for determining the road surface drainage system design with the theoretic Lowest Total Economic Cost (LTEC) is developed. The LTEC design determines the design rain which, when used in a rational-based design context, will yield the most economic choices of gutters, inlets, and laterals considering both construction costs and risk costs. The data needed to find the LTEC design rain are: the number of rains per year, the design gutter flow, duration of average rainfall, runoff coefficient, drainage area, inlet and lateral costs, capital recovery factor, and a traffic loss coefficient. A nomograph and data selection guidance are provided as design aids. Three case studies are presented in an appendix. The method, based on minimizing traffic delay costs, applies to freeways, arterials, and major collectors; local streets with low traffic may be excluded.
TRT Terms	Case studies ; Coefficients ; Costs ; Design ; Drainage structures ; Economic analysis ; Economic efficiency ; Least overall cost ; Nomographs ; Rainfall ; Risk assessment ; Runoff ; Storm sewers ; Surface drainage
Other Terms	Highway drainage; Lowest total economic costs, ltec; Risk; Runoff coefficients
Subject Areas	H22 HYDROLOGY AND HYDRAULICS; I26 Water Run-off - Freeze-thaw
Contract Number	DTFH61-84-C-00082
Report Number	FHWA-RD-88-126; 3D3d2042
Availability	National Technical Information Service Order Number: PB91-104497/AS
TRIS Files	HRIS
Database	TRIS Online

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