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for which the sum of the downstream flow length to the outlet plus the upstream flow length to the drainage divide is maximum (Olivera et al., 1999).

Preparation of the HMS basin file (an ascii file readable by HEC-HMS) is the final step of CRWR-PrePro. In order to do thi, transfer and parameter tables (wshpar.txt and streamp.txt as mentioned above) are needed and are posted on the

CRWR-PrePro webpage (Appendix A).

All units

International

d'unités)

(Olivera

et

al.,

1999).

In

this

must study

curve number, watershed, and

slope, and longest flow thus the HEC-HMS ascii

path were extracted file was not created.

be in SI (Système only the parameters from the delineated

3.4.3

Watershed Modeling System (WMS)

WMS was developed by the Environmental Modeling Research Laboratory (EMRL) at Brigham Young University for use in hydrologic computation and modeling. WMS is a set of modeling codes along with grid and

mesh generation utilities, and post-processing and visualization tools

and

three

dimensions

(Nelson

et

al.,

1997).

WMS

is

different

in both two from using

ArcView different

GIS 3.2 in conjunction with CRWR-PrePro in that it may be hydrologic modeling programs in addition to computing

used to run hydrologic

parameters. Similar to a GIS, WMS automates watershed delineation parameter calculation from digital elevation terrain data, importing GIS data, extracting watershed information from the GIS database.

and and

As shown in Figure 3.15, the WMS drainage menu is similar to the CRWR-PrePro menu. Like CRWR-PrePro, the WMS drainage menu bar contains

51

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