HCA - Liquids v1 0 (04 03 2014)[1]

HCA Liquids

User Exercise

Intrepid 3.0

HCA Liquids User Exercises

HCA Liquids User Exercises v1.0 (04.03.2014) Page 2 of 13

Performing a HCA Liquids Analysis

Step 1: If needed, add required layers

Double-check to ensure that you have the following layers added to your MXD

document:

Spill Points: Required for Potential Method

Spill Plumes: Required for Potential Method

HCA Layers: Required for the graphical representation of the HCA analysis

results

HCA Polygons: The layers to analyze. These layers are required for all

methods.

For more information about layers, see Exercise 5.4: Manipulating Map Layers and the

other exercises in the Map Layer Exercises section of the Intrepid 3.2 User Manual.

Step 2: Click the Run Analysis workflow

In in the Workflow Manager tab, click DOT Compliance > HCA Analysis > HCA

Liquid Analysis > Run Analysis.

The HCA Options Liquid Pipelines window displays:



Step 3: Select the HCA layers to analyze

1) Click the Add Layer button

The Add Layer button is located in the HCA Layers to Analyze section:

When you click it, the Pick a Layer window displays:

2) Select the layers to use

Select the required HCA layers to use in the analysis by clicking their checkboxes and

then click OK.

When you click OK, the selected layers load. Once loaded, their names display in the

HCA Layers to Analyze section:



Step 4: Select the lines to analyze

1) Click the Add Lines button

The Add Lines button is located in the Segments to Analyze section:

The Select window displays.

2) Select the lines to analyze

Navigate to the line(s) to analyze, put a checkmark next to all lines to include, and

then click the Select button. The names of the selected lines now display in the

Segments to Analyze section.

Step 5: Choose an analysis method

There are three possible methods of analysis:

Direct: This method determines where a centerline (and its optional buffer)

overlaps an HCA and creates a ranged HCA event for the overlapped portion of

the route:



Indirect: This method determines where a HCA (and its optional buffer) overlaps

a centerline and creates a ranged HCA event for the overlapped route section:

Potential: This method determines where a spill plume overlaps a HCA and

creates a ranged HCA event centered on the spill point that generated the spill

plume. The ranged HCA event that is created has a length equal to twice the

buffer distance:



Select the chosen option from the Method drop-down menu and click Select:

Step 6: Configure the HCA Options window for the method chosen

Configure the options for the analysis method being used:

A. Configure options for the Direct method

1) (Optional) Click the Buffer Centerline checkbox

The buffer is an extra amount of space added on either side of the centerline to

provide an additional margin of safety when performing the calculations.

Note: Setting a centerline buffer is recommended in order to compensate for any

potential measurement inaccuracies. Forty (40) feet is a commonly used value

for the buffer.

The Buffer Centerline checkbox is located in the Analysis Options section:

2) (Optional) Select a buffering method

Note: This field is not optional if the Buffer Centerline checkbox is checked.

Click the drop-down menu, located directly below the Buffer Centerline checkbox,

and select the buffering method to use:

Calculate from Spill Volume

Use HVL Heat Explosion Buffer

Use HVL Toxicity Buffer

User Specified Buffer Distance

For the purposes of this exercise, select User Specified Buffer Distance.

Note: If you select one of the first three options, the calculations are based on values

stored in the Line Segment window:



For more information, see Exercise 3.8: Viewing, Editing, and Deleting

Organizational Information of the Intrepid PODS 3.2 User Manual.

3) (Optional) Set the buffer value

Note: This field is not optional if the Buffer Centerline checkbox is checked.

In the test field located directly to the right of the drop-down menu, type in a buffer

value to set it.

Note: If you are unsure what to enter, 40 is a commonly recommended value.

4) Select the Analyze multiple crossings of the same polygon individually

checkbox

Click the Analyze multiple crossings of the same polygon individually checkbox

to select it.

Note: Selecting the above box ensures that when the centerline crosses the same

polygon more than once, HCA events are created separately for each

crossing. Otherwise, only one HCA event would be created. This event would

have a begin station at the first crossing and the end station at the end

crossing.

B. The Indirect method

1) (Optional) Click the Buffer HCA Areas checkbox

The buffer is an extra amount of space added on either side of the HCA areas to

provide an additional margin of safety when performing the calculations.

Note: Setting an HCA buffer is recommended in order to compensate for any

potential measurement inaccuracies. A commonly used value for such a buffer

is 1320 ft.

The Buffer Centerline checkbox is located in the Analysis Options section:



2) (Optional) Select User Specified Buffer Distance

Note: The Select Buffer Distance field is required if Buffer HCA Areas is checked.

Click the drop-down menu located directly below the Buffer Centerline checkbox,













3) (Optional) Set the buffer value

Note: The Select Buffer Distance field is required if Buffer HCA Areas is checked.


value to set it.

Note: If you are unsure what to enter, 1320 is a commonly recommended value.

4) Select the Analyze multiple crossings of the same polygon individually

checkbox

Click the Analyze multiple crossings of the same polygon individually checkbox

to select it.

Note: Selecting the above box ensures that when the centerline crosses the same

polygon more than once, HCA events are created separately for each

crossing. Otherwise, only one HCA event would be created. This event would

have a begin station at the first crossing and the end station at the end

crossing.



C. The Potential method

1) Click the Extend HCA Results Along the Centerline checkbox

Note: This buffer is different than the ones used in the Direct and Indirect Methods

because it does not affect when an HCA event needs to be created, but rather

how large the HCA event is once it needs to be created. This buffer is not

optional.

When using the Potential Method, a new ranged HCA event is created on the

centerline when the analysis determines that a calculated spill plume polygon

intersects with a HCA polygon (see the illustration above). To create the HCA

event on the line, this buffer amount is subtracted from the station of the spill

plume point to set the new HCA events begin point. To set the end point, this

buffer value is added to the spill plume points station.

For example, an HCA event needs to be created because a spill plume from

station 10+00 intersects with an HCA area. If the buffer is 500 feet, this means

that the resulting HCA event that is created on the centerline runs from 5+00

to 15+00.

The Extend HCA Results Along the Centerline checkbox is located in the Analysis

Options section:

2) Select User Specified Buffer Distance

Click the drop-down menu located directly below the Buffer Centerline checkbox,













3) Set the buffer value

Note: The buffer value is typically equal to the interval between spill plume points.


value to set it.

4) Check the Measure Horizontal checkbox

5) Check the Utilize Spill Plume Analysis Layer checkbox

If the Utilize Spill Plume Analysis Layer checkbox is unchecked, put a check in it

now.

6) Click the Select Points button

The Select Points button is located in the bottom of the Analysis Options section:



The Pick a Layer window displays:

7) Select the layer containing the spill point data, then click OK

The layers name now displays next to the Select Points button.

8) Click the Select Plumes button

The Select Plumes button is located immediately below the Select Points button:

When you click it, the Pick a Layer window displays again.

9) Select the layer containing the spill plume data, then click OK

The layers name now displays next to the Select Plumes button.

Step 7: (Optional) Save the settings for future use



You can save your current settings for future use by using the buttons in the Default

Settings section:

Enter a name for your settings and then click the Save/Update button. The name you

chose now appears in the Default Settings list.

Note: You can modify a saved setting by double-clicking on it (click Yes on the

message window that appears), making your changes, and clicking the

Save/Update button. To delete a saved setting, click it and then click the Delete

button.

Step 8: Start the Analysis

1) Click Run Analysis

Click the Run Analysis button, located in the extreme bottom-right of the window, to

start the analysis process.

The Enter HCA Analysis Name window displays:

2) Specify a name for the HCA analysis

Enter a name for this particular HCA analysis and then click OK.

The Status processing window displays.

3) Click OK

When the analysis is completed, a confirmation message displays. Click OK to

confirm the completion of the process.

Documents

HCA - Liquids v1 0 (04 03 2014)[1]