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Chapter 2: Literature Review

2.1

INTRODUCTION

From 1996 to 1999, the Center for Research in Water Resources (CRWR) at the University of Texas at Austin developed hydrologic modeling tools for the purpose of floodplain delineation at highway river crossings for TxDOT (Olivera et al., 1999).

From 1999 to 2000, TxDOT funded CRWR to implement these tools and to investigate the possibility of combining existing GIS tools, lumped parameter hydrologic and one-dimensional hydraulic models, and the visual display

capabilities of GIS to overcome the historical limitations of floodplain

Anderson structures.

(2000) Apart

implemented these tools at two from evaluating the feasibility

existing TxDOT of implementing

mapping. drainage the tools

developed at CRWR, Anderson (2000) set out to determine if existing are sufficient to produce an accurate representation of the floodplain.

digital

data

Since the work of Anderson (2000), many issues have arisen regarding the work of GIS in water resources. This chapter reviews some of these problems and work that has been conducted in this area.

2.2

SUMMARY OF CURRENT HYDROLOGIC PRACTICES OF TXDOT

Currently TxDOT relies heavily on manual methods of watershed

parameter extraction. Measurements are taken by hand from paper maps and then

watershed parameters are entered into a hydrologic model.

6

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