Investigation of rainfall and regional factors for maintenance cost allocation.
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2010-08-01
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Alternative Title:Project title: Implementation of enhanced regional factors from climatic soil regions for maintenance budget allocation
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Edition:Technical report; June 2009-May 2010.
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Abstract:The existing formulas used by the Texas Department of Transportation (TxDOT) to allocate the statewide
maintenance budget rely heavily on inventory and pavement evaluation data. These formulas include
regional factors and rainfall indices that vary by district to account for differences in environmental and soil
factors across the state. The existing regional factors were developed in the 1990s and were intended to
reflect differences in environmental and soil factors between districts. It is not known how these factors
were calculated since no documentation is available that explains their development. Since the regional
factors were introduced, the Texas Transportation Institute has completed a project in which a database of
climatic and soil factors were compiled to characterize the variation of climatic and soil conditions across
Texas. TxDOT’s Maintenance Division realized the potential value of using this information and directed an
implementation project to re-examine the existing regional and rainfall factors with the objective of revising
the current factors to better reflect differences in climatic and soil conditions between districts. This report
documents the evaluation of the existing rainfall and regional factors and the development of a revised set of
factors for maintenance cost allocation.
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