OpenRoads Evaluating and Creating Subsurface Utilities · OpenRoads Evaluating and Creating...

OpenRoads

Evaluating and Creating Subsurface Utilities (Existing Utility Models and Proposed Drainage Design)

Presenter: Robert Garrett, PE

Bentley Systems, Incorporated

685 Stockton Drive

Exton, PA 19341

www.bentley.com

http://www.bentley.com/

Workshop: Evaluating and Creating Subsurface Utilities

© 2015 Bentley Systems, Incorporated 2

Before you Begin: ..................................................................................................................................................... 3

Chapter 1: Review Interface and Base Data ............................................................................................................. 4

Exercise: Open and review Base Files ................................................................................................................... 4

Exercise: Review Subsurface Utility Engineering Tools ........................................................................................ 5

Discussion: Review Context Toolbox for Subsurface Utility Engineering Features Error! Bookmark not defined.

Chapter 2: Model Existing Utilities ........................................................................................................................... 7

Exercise: Model Multiple Utilities using a Utility Filter ........................................................................................ 7

Chapter 3: Model a Proposed utility line with Trench ........................................................................................... 11

Exercise: Model a Proposed utility line .............................................................................................................. 11

Chapter 4: Layout Storm Drainage Network ......................................................................................................... 15

Exercise: Place Node and Storm Pipes ............................................................................................................... 15

Exercise: Create Catchments .............................................................................................................................. 23

Chapter 5: Storm Drainage Network Computations .............................................................................................. 25

Exercise: Compute Drainage .............................................................................................................................. 25

Exercise: Review Warnings. ................................................................................................................................ 27

Exercise: Correct the Bypass Flow Errors ........................................................................................................... 30

Exercise: Correct adverse slope .......................................................................................................................... 32

Chapter 6: Maintaining Multiple Scenarios ............................................................................................................ 38

Exercise: Make a new scenario to eliminate the sumps from our Design ......................................................... 38

Chapter 7: Laterals ................................................................................................................................................. 44

Exercise: Add a Lateral Drainage Connection to our drainage network. ........................................................... 44

Appendix: Configuration Variables used in this course .......................................................................................... 48



BEFORE YOU BEGIN:

This training session will utilize the sample workspaces provided in the OpenRoads products to facilitate loading of

necessary libraries used in the exercises. For this exercise you may use any of the following sample workspaces:

Bentley Civil Imperial, Bentley Civil Metric, Bentley Utilities Imperial, Bentley Utilities Metric.

Course Overview:

In this hands-on laboratory you will learn to use the OpenRoads Subsurface Utility Engineering tools to:

Create a model of existing utilities.

Create a model of proposed utilities and trench.

Layout a drainage network.

Use StormCAD tools for drainage design and analysis

All exercises in this manual are product independent. You may use any OpenRoads product in the GEOPAK,

InRoads or MXROAD family.



CHAPTER 1: REVIEW INTERFACE AND BASE DATA

Lesson Objective: In this lesson, we will review the location and function of the Subsurface Utility Engineering

tools and review the data which will be used for a start point of our utilities model. This reference data consists of

an existing ground surface, and surfaces designed in a road or site workflow.

EXERCISE: OPEN AND REVIEW BASE FILES

1. Instructor will guide you which product to use and the exact path of the data.

2. Open Existing Underground Model.dgn

3. DGN files contains:

a. In 2D model:

i. Referenced geometry for a road design project

ii. Referenced survey information for existing utilities.

b. In 3D model

i. Referenced existing ground terrain.

ii. Referenced road design and pond.

iii. Referenced survey information for existing utilities



EXERCISE: REVIEW SUBSURFACE UTILITY ENGINEERING TOOLS

1. The Subsurface Utility tools are located in the top menu.

2. They are also located in Task Navigation, which is where we will reference them in remainder of

this document.



3. If you have used Bentley Subsurface Utility Engineering in previous versions then these locations

will look familiar to you. There are simply more tools available now to add drainage design

functionality.

4. Within task navigation you will find the following tools:

a. Components – these are tools related to layout and configuration of utility models and

drainage models

b. Compute – these tools are related to configuring and calculating hydraulic runs.

c. View – These tools are related to configuring and viewing various results of the modeling

process. For example, opening different views (profile and cross-section), configuring

tools tips and custom attributes, queries and other similar.

d. Tools – these are various miscellaneous tools such as conflict detection.

e. The remaining task panels are duplicates of various OpenRoads tools presented in the

utility task panel for convenience of workflow.



CHAPTER 2: MODEL EXISTING UTILITIES

Lesson Objective: In this lesson, we will create a model of multiple existing features in one step using graphic

filters. The source features are contained in a reference file and are mix of survey points and survey lines. Using

this method, the Subsurface Utility modeler can model many utility lines in only a few steps.

EXERCISE: MODEL MULTIPLE UTILITIES USING A UTILITY FILTER

1. Continue in same file Existing Underground Model.dgn.

2. Open Project Explorer > Civil Standards tab > Utility Filters branch. You will note that there are

several different filters configured. These could have been created in a dgnlib file, but in this case,

we made them directly in the DGN where the utilities will be modeled.

3. Start the Extract Utilities From Graphics command.

4. Set method to Graphic Filter



5. Then choose the filter group named “All Utilities” in the dialog. In this command you can use a

single filter such as the filter for water lines or you can use a filter group which provides the ability

to search for many filters at once. The filter group named “All Utilities” contains all the filters to

extract water lines, fire hydrants, sewer lines, power poles and more.

6. There is no prompt to pick a terrain model because all the survey data is in 3D and our filters are

configured to use the element elevations.

7. Create trench = No.

8. Many various utility lines in the DGN should have been found and modeled.

9. The instructor will walk you through some review of the model and the filters.

10. Notice in the center of the project there is a surveyed existing pipe which was not modeled. This

is because our filter group did not have a filter for these pipes. From the survey notes, we know

this is a 24” corrugated metal pipe. We can create a model using the same command but use the

Selection method.



11. Start the Extract Utility From Graphics Command.

a. Method = Selection

b. Use 3D Element Elevations = Yes

c. Vertical Offset = zero

d. Create Trench = No

e. Feature Definition = Storm Sewer Circular CMP

f. Description = 24”

12. Select the surveyed pipe and enter prompts as above.

13. You will see that the pipe is modeled.



14. You will also see generic nodes modeled at the ends. These nodes exist because every conduit

must have nodes defined at the ends. When the feature definition is not defined then a hard

coded generic like you see is used. Since our active level is Default, we can easily tunr off these

generic nodes.

15. Or we can assign a headwall feature definition to the generic nodes.

WHAT WE HAVE LEARNED:

Using utility filters, we can model many different types and sizes of utilities at once.

Utility filters can be created in advance in libraries, or on the fly as needed in the active dgn file.

Extract Utility From Graphics command can use filters individually or filter groups to create the

utilities.

Using utility filters, you can create a model of a drainage network from 3D surveyed nodes and

pipes.



CHAPTER 3: MODEL A PROPOSED UTILITY LINE WITH TRENCH

Lesson Objective: In this lesson, we will create a model of a proposed water line using a geometric layout and

design profile.

EXERCISE: MODEL A PROPOSED UTILITY LINE

1. Open …Proposed Utilities.dgn. On left and right sides of the residential road are alignments for

new proposed water and sewer lines. Select the blue geometry and you will recognize that this

alignment is created with OpenRoads Geometry tools.

2. Start the Extract Utilities From Graphics command. You will get a prompt to create a utility

model.

3. Answer Yes to this prompt and then start the Extract Command again. What is happening is the

creation of a utility database embedded in the DGN file.



4. This is same command we used in previous exercise.

5. The next steps will be identical to what you did in chapter 5 except:

a. Set Feature Definition to Water Line Ductile Iron.

b. Set Size/Description to 6”

c. Method = Selection

d. Pick the blue alignments. Reset to stop picking.

e. Pick existing ground terrain model for elevation reference.

f. Vertical Offset to -4.00ft (-1.2m)

6. Set Create Trench to Yes

7. Set Design Stage to Final Components



8. Design stages work identically as in OpenRoads corridors. Subsurface Utility Engineering makes a

corridor in order to model the trench.

9. We can further check our design by reviewing cross-sections.

10. Click Open Cross Section View in tasks.

11. Follow the prompts:

a. Locate Corridor or Alignment – pick the red side road centerline

b. Left and Right offset – enter 30ft or dynamically locate a width

c. Start Station – about 0+50

d. Interval – 10 ft

e. Then open the cross-section in view 8



12. At the beginning, you will note the water line and trench on the left

13. If time permits, the instructor will guide you thru the editing of the proposed utility profile.


The Extract Utility From Graphics command can be used for proposed utilities as well as existing.



CHAPTER 4: LAYOUT STORM DRAINAGE NETWORK

Lesson Objective: In this lesson, we will explore how to place nodes and pipes to build a storm drain model. We

will place 1 headwall (outlet) in the pond and we will place 4 catch basins along the new side road.

EXERCISE: PLACE NODE AND STORM PIPES

1. Open …01Proposed Drainage Layout.dgn

2. Start the Place Node command.

3. You will be prompted to create a new utilities project. Click Yes

4. Then restart the Place Node command.

5. Select feature definition to Headwall Straight 24 in the command dialog.



6. The first prompt is to pick the reference element. This can be any 3D element in our model and is

used to set the top elevation of the node. In this instance, the node needs to be placed at the

bottom of the pond. IN this case, it is easiest to pick the pond bottom in plan view because the

plan view is less cluttered. Pick the pond bottom.

7. Placement Type = Minimum Depth

8. Then in the plan view, Datapoint to place the headwall in corner of pond.

9. The last prompt is to define the rotation.

10. Now we need to place catch basins. We will use Civil Accudraw to help us. If you do not see the

Civil Accudraw toolbox shown below then activate it at Tools > Civil Accudraw > Activate Toolbar

11. Set the method to station / offset by click the button shown above. And turn on Accudraw with

the first button.



12. Start the Place Node Command again and set Feature Definition to Inlet C Flat.

13. The curb on our road does not include a monolithic gutter, so the tops of catch basins will sit on

the pavement surface. Pick the road top surface for reference element.

14. Placement Method is minimum depth

15. Then, for exact placement we will be using Civil Accudraw to assist. If you do not see the civil

Accudraw inputs attached to your cursor then click the first button in the Civil Accudraw toolbox

to turn it on.



16. Tab key until focus is in the station field. Then click O (letter O) on keyboard to allow us to select

the geometry which will drive station and offset readout. After click O, pick the curb return

geometry.

17. Now, the station and offset are based on the curb return. Type station 0+22 and offset zero. Tab

key after each input to lock the value.

18. Then Datapoint to place the node.

19. The final prompt is for rotation of the node. Civil Accudraw can help here as well. Turn the node

until Civil Accudraw “locks” itself to the perpendicular.



20. Then datapoint to finish placing the node. In 3D model then we have a headwall and a catchbasin.

21. Now, place a second node using the same feature definition but use the other curb return for Civil

Accudraw. Use station 22 offset zero again.



22. Then place two more nodes. This time use the side road centerline with Civil Accudraw. Station

3+00. Place one catch basin at -13 offset and the other at +13.

23. Now we need storm drain pipes connected between the 4 catch basins and the outlet. Start the

Conduit Between Nodes command.



24. Set the feature definition to Storm Sewer Circular RCP and size to 12”

25. Follow the prompts and place pipes between the nodes placed above.

26. Start at the top left and connect as shown by the arrows below.



27. Pipe connection direction does it matter? The direction in which you create pipes does not matter

except when connecting to headwalls. When connecting to the headwall:

a. If the headwall is picked first then it is defined as an inlet.

b. If the headwall is picked second then it is defined as an outlet.

28. So, why did we draw in a downstream direction like above? This is simply a recommended best

practice, not a requirement. By always creating pipes in downstream direction then some reports

and flex tables are more consistent for us to read.



EXERCISE: CREATE CATCHMENTS

1. Continue in same file …01Proposed Drainage Layout.dgn

2. In Level Display, turn on level named Drainage-Area to see 4 shapes for our catchments already

created.

3. Start the Place Catchment command.

4. This command is used to create both catchments and low impact development (LID) structures.

Both are depicted as polygons in the 2D view.

5. We will use method of Pick Shape as shown. Choose feature definition Residential Heavy.



6. Select the Shape for the drainage area.

7. Then select the outflow element. The outflow element is the inlet into which the drainage area

flow is directed.

8. Then (optionally), pick the exiting ground terrain model as reference surface. You will need to

zoom out some to pick the terrain.

9. Picking the terrain model allows the catchment to be drawn in 3D as well as 2D. Also notice that

the symbology has changed to match the feature definition.

10. Repeat the process for the other three drainage areas.


How to layout node and conduit features for a storm drain network.

How to create catchments for our drainage network



CHAPTER 5: STORM DRAINAGE NETWORK COMPUTATIONS

Lesson Objective: In this lesson, we will perform hydraulic design of our drainage network.

EXERCISE: COMPUTE DRAINAGE

1. Open …02Proposed Drainage Computations.dgn

2. Let’s start by reviewing our drainage design parameters. Open the Scenario Manager.

3. The scenario Manager is used to manage our various hydraulic computations settings. In our

project we have 2 scenarios to start with. We will focus on the Design scenario today.



4. Double click Base Design to see the settings for this scenario in the Hydraulic Analysis tab of the

properties.

5. A complete discussion of these settings is outside the scope of today’s lesson but keep in mind

the following:

a. Under alternatives, you find all the different ways to vary inputs to the computations.

b. For example:

i. Rainfall runoff is where you define storms and storm return period.

ii. Design is where you define design constraints such as min/max slopes and cover.

iii. Physical is where you can lock values for individual elements such as elevations,

slopes and pipe sizes.

c. Under calculation options is where you define the methods of calculations. For example,

whether to perform a peak flow calculation or a dynamic calculation.

6. Close the property panel

7. In Scenario Manager select Base Design and c then in the row of tools click on Compute.



8. You will be prompted if you wish to create a new physical alternative.

9. This prompt is advising us that the computations are likely to overwrite information such as

slopes and elevations and pipe sizes in our drainage layout and asking if we wish to preserve the

current settings before performing the design.

10. Answer Yes. Then enter a new physical alternative name in the next box.

11. This will make a new physical alternative for the design values that are about to be determined

and preserve the original physical values in the alternative named Base Physical.

12. Once the design finishes, click Close on the summary box.

13. You will see that the 3D model has updated to reflect the new design.

14. Select a pipe and open Utility properties and notice that the pipes have changed from the 12” size

we laid out to 15”-24”.

EXERCISE: REVIEW WARNINGS.

1. Continue in same file …02Proposed Drainage Computations.dgn



2. You will see several warning glyphs on screen. Open Civil Message Center to review these.

(Tools> Civil Geometry > Geometry Toggles > Civil Message Center)

3. Let’s start at the bottom: For every catchment, we have a warning that minimum time of

concentration was used. The reason we get this warning is that we never explicitly defined time

of concentration for the catchments. When Tc is zero then the minimum is used. Minimum Tc is

defined in Calculations Options.



4. Double click Base Design and note that minimum Tc is defined as 5 minutes.

5. There are 4 warnings (one for each catch basin) advising us that we have failed to define how to

route bypass flow. We’ll correct this below.

6. There are two warnings about an adverse pipe slope. We will check and correct this below.

7. There is one warning for encroachment on minimum cover. This is on the pipe near the outlet

and thus is of no concern to us.

8. The top 3 warnings are telling us that maximum spread has been exceeded. The solution is to

replace inlets with ones of higher capacity or add more inlets. We will not concern ourselves with

these today.

9. You can easily locate which element that a warning applies to by right click the message in

message center and choose Zoom To.



EXERCISE: CORRECT THE BYPASS FLOW ERRORS


2. From above we know that each of our 4 catch basins exhibits a warning that we did not assign

bypass flow. For two of these, the inlet is actually in sag and thus we need to change the inlet

definition. For the other two, we need to define hydraulically how gutters will route bypass flow.

3. Select one of the inlets in the intersection and open Hydraulic Property panel.

4. In hydraulic properties, change the inlet location from On Grade to In Sag

5. Repeat for the other inlet in the intersection.



6. For the other two inlets, we need to define the route for the bypass flow. We do this by defining a

hydraulic gutter definition. In this release, there is no method to extract gutter information from

the OpenRoads road design into the hydraulic data. Thus, the Place Gutter command is sued

ONLY for hydraulic definition not physical model.

7. Start the Place Gutter command.

8. You will see a message asking to turn on analytic view. Analytic view is used to present

graphically, those hydraulic elements which do not have a physical presentation.

9. Click Yes

10. You will see a variety of labels appear in plan view. The use of these labels is covered in other

workshops, ignore them for now.

11. Continuing to define the hydraulic gutter definitions, you will note that the Place Gutter

command is actually just a modification of the conduit between nodes command.



12. Select start nodes and end nodes for the gutters, on gutter each side of road, as shown below.

Since we are explicitly defining direction of bypass flow then the direction we create the gutter

matters.

13. Now, open Scenario Manager and recompute our design. You do not need to create a new

physical alternative this time so answer No when prompted.

14. Review Civil Message Center to see that the bypass errors are now rectified.

EXERCISE: CORRECT ADVERSE SLOPE


2. In Civil Message Center, right click on the warning about adverse slopes, then click Zoom To. We

find that the pipe in question is the one which connects to our outlet. The reason that this slope is

being defined adversely is because the change in elevation between road and pond is minimal

and because the underlying design constraints are competing with one another.



3. A good way to get a better sense of what is happening is a quick profile view. Open Project

Explorer. (File > Project Explorer)

4. Select the utility tab. Notice that all our utility elements are tabulated here.

5. Right click on Profile Runs and choose Create Profile Run

6. Notice that you can type a name for the profile run if you wish.

7. Then pick the 4 pipes in order. Upstream or Downstream does not matter.

8. Reset when finished picking

9. Now, in the project explorer, right click the new profile run and choose Open Analysis Profile



10. Here, we get a quick overview of our drainage design, including the adverse slope on the outlet

pipe. You can also see (if you hadn’t noticed already) that our inlets all have sumps in them. We’ll

change this later.

11. With the profile view to guide our thinking, we can see that the outlet pipe is running uphill.

There are a few ways we could correct this, including plan view manipulators and an OpenRoads

profile.

12. In Project Explorer, right click our profile run and choose Open Profile. This opens an OpenRoads

profile.



13. We can see our adverse slope here too. Select the pipe in question and with the text manipulator

change the slope to -0.5%. Remember: the manipulators (here and similar ones in plan view)

always change the elevation nearest to the manipulator you edit.

14. This corrects the adverse slope to our minimal slope of 0.5%.

15. However, if we recompute now, the design constraints will once again adjust the elevations and

our edit would be undone. What we need to do is instruct the design engine that our edits will

override the design engine.



16. In plan view, select the pipe and open hydraulic properties.

17. In hydraulic properties, change the values for Design Start Invert and Design Stop Invert to false.

Remember above when we recommended that you always create pipes in downstream direction

even though it is not required? This is one place where that consistency is helpful. If our pipes are

always drawn the same then we always know that start is upstream and stop is downstream.

18. DO NOT change the value for Design conduit. We still want the size to be designed. But setting

the start and stop elevation to false will preserve our edit from above.



19. Now, in scenario manager, recompute the base design to see that we have resolved the adverse

slope.

20. You will also note that some other pipe sizes changed because this pipe and its slope is having

such an impact on the entire system.

21. In the next chapter, we will deal with those sumps.



CHAPTER 6: MAINTAINING MULTIPLE SCENARIOS

Lesson Objective: In this lesson, show how to create and configure additional scenarios.

EXERCISE: MAKE A NEW SCENARIO TO ELIMINATE THE SUMPS FROM OUR DESIGN

1. Open 03Proposed Drainage Scenarios.dgn.

2. Our goal is to redesign the drainage network to remove the sumps from the inlets.

3. One way to do this would be to edit each individual inlet. Select any inlet and open hydraulic

properties.

4. We could (but will not) change the desired sump depth) to zero and then recompute. But this

would not allow us to easily put the sumps back if we decide we want them later.



5. A better way is by using Scenario Manager

6. In scenario Manager, right click on Base Design and choose New > Child Scenario

7. Name the new Scenario “No Sumps”

8. As a child of Base Design, No Sumps is at this point identical. Double click No Sumps to open the

hydraulic properties. Exploring the two scenarios reveal the settings to be identical.



9. We need to change the settings that control sumps. In the hydraulic properties for the inlets

above we see that desired sump depth is listed under design section of the panel. This gives us a

clue that the settings we need to change in the scenario is also in the design alternatives.

10. Open Alternatives

11. So, here is a diagram of how scenarios are configured.

a. Alternatives List has a 1:1 correlation to the Alternatives Settings in the Scenario

properties

b. Calculation Options configure the details of the Calculation options in the scenario

properties.



12. In alternatives we need a new Design Alternative without sumps. Right click on Base Design under

design alternatives and make a new child alternative.

13. Name the new alternative No Sumps by click on it.

14. Double click the new design alternative to open it for editing

15. In the Node tab, change the desired sump depths to zero.

16. Now we have two design alternatives which are identical except for sump depth.



17. Now in scenario manager, double click the No Sumps scenario to open its properties. Change the

Design alternative in the properties to No Sumps.

18. Now, compute scenario named No Sumps. We will get a redesign of the drainage network. It will

be mostly identical except the sumps will be gone, and the hydraulic impact of the missing sumps

may impact other portions of the design as well.



19. Now, we have a good design without the sumps. If we ever need to return to a design with

sumps, we simply recompute the original scenario.



CHAPTER 7: LATERALS

Lesson Objective: In this lesson, we will see how to add lateral connections to our drainage network. Lateral

connections allow for a node to connect to a trunk line without breaking the trunk line into two parts. A basic tee

connection is modeled in 3D.

The lateral pipe is not analyzed hydraulically in this release. Flow from the remote inlet is considered to enter the

trunk line at the upstream end of the trunk, except when using a SWMM hydraulic calculation, where it is

considered at the location of the tee.

Laterals can also be used to model service connections for water, sewer, gas and other non-drainage utilities.

EXERCISE: ADD A LATERAL DRAINAGE CONNECTION TO OUR DRAINAGE NETWORK.

1. Open 04Proposed Drainage Laterals.dgn.

2. Start the Place Laterals command

3. Set Feature Definitions as shown below. NOTE: When placing laterals, the node and link feature

definitions in the dialog must be of the same type and must also be the same type as the trunk

line to which they will connect. In other words, storm matched with storm, etc.

4. Select the existing ground terrain for reference element. This sets the top elevation of the lateral

node



5. Then select the trunk line. Pick the drainage pipe which runs along the length of the side road.

6. Then you can set the vertical offset of the node and skew. Notice that the positions moves

dynamically along the trunk line.

7. Last, set the rotation of the lateral node.

8. Take a couple minutes to review the lateral which was placed.



9. We now need a catchment defined for the lateral node. Use the Place Catchment command with

Pick Points option.

10. Create a catchment by snapping and clicking similar in shape as below

11. Be sure to pick the new lateral node as outflow element.



12. Before we compute again to see the effect of the lateral, select the trunk line and open Hydraulic

Properties. Scroll down and note the flow in the pipe, especially that there is zero flow

contributed by laterals.

13. Now recompute the No Sumps scenario. You will notice that there is now flow contributed by the

lateral.



APPENDIX: CONFIGURATION VARIABLES USED IN THIS COURSE

In these lessons the workspaces which we used contain the following configuration variables which are relevant

to the Subsurface Utilities toolset:

MS_CELL < $(_USTN_PROJECTDATA)/cell/

Points to the directory location containing the 2D and 3D cell libraries used by the subsurface utility tools

MS_CELLLIST < $(_USTN_PROJECTDATA)/cell/*.cel

Points to the cell libraries themselves.

CIVIL_CONTENTMANAGEMENTDGNLIBLIST > (_USTN_PROJECTDATA)/dgnlib/SampleDrainageFeatureDefs.dgnlib

Points to the utility feature definition library

MS_DGNLIBLIST > $(_USTN_PROJECTDATA)/dgnlib/SampleDrainageFeatureDefs.dgnlib

Points to the location of element templates used by the feature defintions. Since the element templates

are in the same file as the feature defintions then the filename is same.

CIVIL_CIVILTMDGNLIBLIST > $(_USTN_PROJECTDATA)/dgnlib/SampleDrainageFeatureDefs.dgnlib

Points to the library containing the utility filters.

SUDA_SEED_FILE = $(_USTN_PROJECTDATA)/dgnlib/SampleDrainageFeatureDefs.dgnlib

SUDA_SEED_MODEL = Default

Points to the library, and DGN model, which contains hydraulic seed information. Information such as

inlet and grate dimensions, pipe roughness factors, catchment runoff factors and more are contained

here. Whenever a new utility project is created, the hydraulic seed information is copied to the new dgn

file.

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