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Parameter Sensitivity in Hydrologic Modeling - page 95 / 163

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Figure 4.17: TIN Development in WMS

Points were added until the study area was densely populated with point elevations. Breaklines were added to the model to reflect streams and other terrain features as shown on the DRG. In this way, when the triangles are created

they are forced model icon was

to conform to these lines.

To add breaklines, the conceptual

selected

and

the

TIN

was

turned

off.

A

new

coverage

of

type

drainage

was

created

with

attributes

typed

as

generic

to

form

the

bounding

polygon around Area 2. Generic arcs were used Feature Objects, arcs were converted to polygons.

to

cut

around

the

TIN.

Under

To create the streams, stream arcs (feature type is stream) were generated to make the triangle edges conform to the streamlines as shown in Figure 4.18. The feature objects were then edited to redistribute spacing of points every 75 meters (this number was chosen fairly arbitrarily).

85

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