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Transportation (TxDOT) has this software package, and also that the preprocessor under investigation, CRWR-PrePro, operates only with ArcView GIS 3.2.

3.4.2.1 CRWR-PrePro

CRWR-PrePro was developed by several investigators at CRWR. It is the combination of several pieces of work developed by different researchers over a period of time. The first person to work on CRWR-PrePro was Ferdi Hellwager

(1997).

That

same

year,

developed by Dean Djokic

the Watershed and Zichuan Ye

Delineator ArcView extension was of ESRI. This work was followed by

the Flood Flow Calculator ArcView estimate flood peak flows according

GIS 3.2 extension in to regional regression

1997 by CRWR to equations using the

spatial data extraction capabilities of GIS.

Combining

extensions

led

to

development

of

a

hydrologic

modeling

these three ArcView tool that prepares an

input

file

for

the

HEC-HMS

basin

component

(Olivera

et

al.,

1999).

CRWR-

PrePro,

shown

in

Figure

3.14,

is

the

predecessor

to

the

more

commonly

used

HEC-GeoHMS, as described USACOE-HEC, (2000).

in

the

forward

of

the

HEC-HMS

User’s

Manual

46

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