Do flow rates respond asymmetrically to water level? Evidence from the Edwards Aquifer

Bradley T. Ewing, Teresa Kerr, Mark A. Thompson

Research output: Contribution to journalArticle

2 Scopus citations


This research examines the time series relationship between the Comal Springs flow rate and the water level in the Edwards Aquifer (Well J-17). The empirical methodology utilizes threshold autoregression (TAR) and momentum-TAR models that allow for asymmetry in responses and adjustments to a disequilibrium in the long-run cointegrating relationship. Based on the results, an asymmetric error-correction model (AECM) is proposed to characterize the short-run and long-run dynamic relationship between spring flow and water level. The results have implications for the management of water resources, water demand, and ecosystems.

Original languageEnglish (US)
Pages (from-to)1121-1129
Number of pages9
JournalJournal of Applied Statistics
Issue number10
Publication statusPublished - Dec 1 2006
Externally publishedYes



  • Asymmetric adjustment
  • Edwards Aquifer
  • Spring flow
  • Threshold cointegration
  • Water level

ASJC Scopus subject areas

  • Statistics and Probability
  • Statistics, Probability and Uncertainty

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