Transcript HEP_training.pptx

Specialized GIS Skills at the SWFWMD
Part 4: ArcGIS 202 – Hydraulic Element Points
Hydraulic Element Points in ArcHydro
What is a “Hydraulic Element Point (HEP)”?
ArcHydro constructs a generalized, natural HydroNetwork consisting:
- HydroJunction(s): points connected by
- HydroEdge(s)
This “generalized” network shows the surface flow direction but does not include any details
regarding the “elements” (structures) comprising those Junctions and Edges
Hydraulic Element Points in ArcHydro
What is a “Hydraulic Element Point (HEP)”?
In the language of GWIS/ArcHydro, a HEP is a point that contains the detailed
description of the hydraulic element (structure).
Hydraulic Elements include objects such as:
- the ends of a pipe (end treatments)
- each element comprising a water control structure
- a weir
- a bridge deck, a bridge opening, or a bridge pier
- etc.
Hydraulic Element Points in ArcHydro
Steps in Collecting Hydraulic Element Points – Overview 1 - Setup
When starting a NEW Watershed:
1- Create a workspace (directory) on your local drive.
2- Use ArcCatalog to COPY the HEP Geodatabase to your directory.
3- Use ArcCatalog to RENAME the HEP Geodatabase to: WATERSHED_HEP
4- Start a new ArcMap session with the following items in the TOC:
a) Digital Elevation Model (DEM) for the watershed
b) Recent or appropriate imagery (use an image service where possible)
c) Georeferenced plans
d) The following feature classes from the WATERSHED_HEP Database:
-HYDROJUNCTION
-HYDROEDGE
-HEP_LINE
-HYDRAULIC_ELEMENT_POINT
5- SAVE the ArcMap .MXD as WATERSHED_HEP.MXD (The name of the .MXD MUST
be the same as the GWIS database for the tables to synchronize.)
Hydraulic Element Points in ArcHydro
Steps in Collecting Hydraulic Element Points – Overview 2 - Collection
To Collect/Edit HEPs from an ERP:
1- Add the georeferenced ERP sheet to the WATERSHED_HEP.mxd
2- Open supplementary detailed plan sheets (as needed)
3- Start Editing on the HYDROJUNCTION and HYDROEDGE feature classes
4- Collect the HydroNetwork first: HydroJunction(s) and HydroEdge(s).
NOTE: We advise studying the collection system as they usually
occur in discrete sections. Familiarize yourself with a section so that
you understand how the system works, finding the inlets, outfalls,
structures, and connectivity, unseen pipes, and below surface
connections.
REMEMBER TO SAVE OFTEN!!
5- Stop Editing and SAVE the HydroNetwork
6- Collect the HEPs for the collection system.
(You do not need to open an Editing session.)
7- Identify another collection system and repeat 3 – 6
8- Repeat until complete ERP has been collected
9- Save your MXD and edits incrementally and when completed with an ERP.
NOTE: Remember that you SHOULD be collecting HEPs from the most
recent ERP revision. Check for earlier revisions that may contain additional
HEP information
Hydraulic Element Points in ArcHydro
Collecting Hydraulic Element Points – Details
Initial Setup
Copy the HEP Geodatabase to your directory
Use ArcCatalog to make sure that the fGDB is named correctly (Watershedname_HEP.gdb)
Start (or open) an ArcMap with the following layers:
- Recent/appropriate imagery
- The county-wide DEM for the watershed
- The following layers from the WATERSHED_HEP GDB
HydroNetwork:
HYDROEDGE
HYDROJUNCTION
Watershed:
HEP_LINE
HYDRAULIC_ELEMENT_POINT
Notes:
1- You can add any tables to the MXD to check that
features are being added correctly.
2- DO NOT rename any of the Feature Classes
Hydraulic Element Points in ArcHydro
Initial Setup, con’t.
Save the MXD as:
WATERSHED_HEP.mxd.
NOTE: It is VERY important that the name of the
MXD and the fGDB are the same. Otherwise the
HEPs will not be synchronized in the database
tables.
Hydraulic Element Points in ArcHydro
Initial Setup, con’t.
Add the georeferenced ERP to the ArcMap document
HINT: You might want to turn on the “EFFECTS” tool to SWIPE the ERP
and/or adjust the TRANSPARENCY of the ERP
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork
Study the ERP plan and identify/isolate a specific portion of the collection system.
You may need to reference the original PDF
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t.
Start editing the HYDROJUNCTION Feature Class (right-click in TOC)
Choose the Point feature to edit
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t.
Collect the HYDROJUNCTIONS (I also changed the symbol)
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t.
The HYDROCODE_DESC field is found in both the HYDROJUNCTION and HYDROEDGE
tables. It is used to track these features through the ArcHydro database. It is also
used to identify these features on an ERP-by-ERP basis.
The values are of the form: ERP_XXXXXX.XXX_### where XXXXXX.XXX is the ERP Number
and ### is a 3-digit sub-element number (including leading 0s)
Because this value will be used as an ERP-specific value, the operator MUST manually
input and increment it.
YOU will need to Type (or Copy/Paste) the HYDROCODE_DESC for each HYDROJUNCTION
and each HYDROEDGE that you enter. You will also need to add the ERP number (minus
the ### for any General HEP Points by manually editing the HYDRAULIC_ELEMENT_POINT
Table.
The following slides illustrate the preferred workflow.
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t. – Recommended Workflow
1- Right click on HYDROJUNCTION and scroll to Edit Features
2- Select the HYDROJUNCTION
for editing
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t. – Recommended Workflow
3- On the Editor Toolbar, use the Attributes Button to edit the fields
4- Edit the HYDROCODE_DESC
Field (ERP_XXXXXX.XXX_###), then
Copy that entry (Ctrl-C)
5- Use the dropdowns to select value
for the
HYDRAULIC_TYPE_DESCRIPTION
6- Capture the next HYDROJUNCTION,
and,
7- Paste the HYDROCODE_DESC
and increment the ### by 1
8- CHECK the HYDROID to make sure
that it is incrementing as you add
features.
9- Capture all the HYDROJUNCTIONS
for the collection subsystem.
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t. – Recommended Workflow
9- Activate the HYDROEDGE Feature Class and choose the Line construction tool
10- Activate the SNAPPING Tool and choose NODE
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t. – Recommended Workflow
12- Paste/Update the
HYDROCODE_DESC
11- Digitize the HYDROEDGE
NOTE: The FLOW_DIRECTION_DESC, HYDROEDGE_TYPE_DESC,
HYDROEDGE_PLACEMENT_DESC, HYDROEDGE_HYDRAULIC_TYPE_DESC,
And INCLUDECONNECT_DESC will auto-populate.
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork, con’t. – Recommended Workflow
13- Complete collecting the HYDROEDGEs, and
14- Save your edits.
(Remember, it is a good idea to save your edits incrementally as you are working!)
You have now collected the HydroNetwork. On to HEPs …
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork – Alternative Workflow
1- Collect ALL the HYDROJUNCTIONS and HYDROEDGES in the subsystem
2- Open the HYDROJUNCTION table (with edit session still open)
3- Edit (Copy/Paste/Update) the HYDROCODE_DESC field
4- Repeat for the HYDROEDGE table
Hydraulic Element Points in ArcHydro
Collect the HydroNetwork – Continued Workflow
It is VERY important that the HYDROCODE_DESC value remain unique. Some ERPs
may require several sessions over several days to complete. So, when returning to
continue the HydroNetwork collection, you should:
1- Open BOTH the HYDROJUNCTION and HYDROEDGE tables,
2- Sort (right-click on the field header) the HYDROCODE_DESC field, and
3- Record the highest numeric value to increment for your next HYDROCODE_DESC
Hydraulic Element Points in ArcHydro
Check/Assign the HydroIDs
ArcHydro works by maintaining a unique HydroID for each and every feature. When you heads-up
digitize features, HydroIDs should be assigned sequentially. This SHOULD happen automatically,
BUT it is always a good idea to check. Open the HYDROJUNCTION and HYDROEDGE tables to check.
IF there are negative HydroIDs, use the Attribute Tools Dropdown Menu and select Assign HydroID
Hydraulic Element Points in ArcHydro
Check/Assign the HydroIDs
Check that the HydroIDs have been assigned correctly by opening the
HYDROEDGE and HYDROJUNCTION tables
You are now ready to collect the HEPs !
Hydraulic Element Points in ArcHydro
Setup and Collecting HEPs
Activate the SWFWMD Connectivity Toolbar and select the type of HEP you are going to capture
REMEMBER: HEPs (except General Points) are associated to the HydroNetwork, so…
- Pipes (and Barrels) are associated with HYDROEDGES
- Weirs are associated with HYDROJUNCTIONS
- Bridge Decks, Openings and Piers are associated with HYDROJUNCTIONS
- General Points are not associated with the HydroNetwork
Hydraulic Element Points in ArcHydro
Collecting HEPs
When first starting to collect Hydraulic Element Points, the cursor will turn into
a crosshair and when you click on the FIRST point to capture, you will get a
Dialog box…
Use the Down Arrows to navigate to the Countywide DEM that you are using
and make SURE that the correct Feature Classes are selected for each of the
additional specified Feature Class destinations.
Hydraulic Element Points in ArcHydro
Collecting HEPs
If you click on a HEP point, you WILL SEE this error message…
because FIRST you MUST select either a HYDROEDGE or HYDROJUNCTION
with which to associate the HEP (except for General Points).
- Pipes (and Barrels) are associated with HYDROEDGES
- Weirs and Control Structures are associated with HYDROJUNCTIONS
- Bridge Decks, Openings, and Piers are associated with HYDROJUNCTIONS
- General Points are not associated with the HydroNetwork
Use the ArcGIS “Select Tool”
to graphically select the appropriate HydroNetwork element
Hydraulic Element Points in ArcHydro
Collecting HEPs – Pipes
With the HydroNetwork Element(s) selected and Pipe chosen, click the UPSTREAM end, fill in the
table, then click the DOWNSTREAM end and fill in the table to complete the Pipe.
The Connectivity Tool will estimate the elevation from the DEM, but YOU are expected to review
the plan and INPUT the ACTUAL elevation and other detail information!
Once the HEPs (Upstream/Downstream) are captured, the ArcHydro will construct the HEP_LINE
representing the actual pipe (green line in the figure below). You do not digitize the HEP_line!
Hydraulic Element Points in ArcHydro
Collecting HEPs – Pipes
Table after clicking up-stream element
with elevation from the DEM. Notice that
the HYDROCODE_DESC was transferred from
the selected HydroEdge!
Table after editing the elevation from
the plan set
NOTE: Gray fields CANNOT be edited
Repeat for the downstream element editing the ELEMENTZ field
Hydraulic Element Points in ArcHydro
Collecting HEPs – Pipes
When the Upstream & Downstream elements are defined, the SubElement Table – Pipe will appear
The gray fields still cannot be edited; YOU need to fill in the non-gray fields. Several can be
populated from the database domains; others are manually edited (when possible) using plan details.
Notice:
(1) New HydroIDs have been assigned and
(2) the HYDROCODE_DESC of the HydroEdge has been retained
Hydraulic Element Points in ArcHydro
Things To Watch For When Collecting HEPs – Pipes
Pipes/Culverts going under roads are represented by a single HYDROEDGE
with HYDROJUNCTIONS at the ends
HydroJunction
HEP
(Inlet/Outlet) HEP
[UIC - SubElement 1]
[UIC – SubElement 2]
HydroEdge
(Pipe)
HEP
HEP
[DIC - SubElement 1]
[DIC – SubElement 2]
HydroJunction
(Inlet/Outlet)
Pipe HEPs are related to the HYDROEDGE
A Subelement Index Count is assigned to each pair of HEPs
Hydraulic Element Points in ArcHydro
Things To Watch For When Collecting HEPs - Structures
HYDROJUNCTION
HEP
HEP
HEP
HEP
One HYDROJUNCTION (the structure) with two HEPs (horizontal and vertical weirs) plus
the two(2) HEPs related to the HYDROEDGE for the Pipe!
Hydraulic Element Points in ArcHydro
Collecting HEPs – General Points
General Points include elements such as; Ground Elevations, Top of Road, Channel Banks,
and others. To capture a General Point:
Select General Point from the Drop Down
Click on the Map
Use the Domain Field to choose the General Point Type
Hydraulic Element Points in ArcHydro
Collecting HEPs – General Points, con’t.
Click on the POINT_TYPE_DESC to show the types of points available in the Domain
and select the appropriate type
The ELEMENTZ files will self-populate from the DEM; Adjust the elevation
to the plan set elevation. Press “OK” and continue collecting HEPs
Hydraulic Element Points in ArcHydro
Collecting HEPs – General Points, con’t.
GENERAL POINTS require the operator to manually enter the HYDROCODE_DESC, but
because these points are NOT associated with the HydroNetwork, they are NOT
assigned a numeric extension.
After GENERAL POINTS are collected, the operator should open the
HYDRAULIC_ELEMENT_POINT table and calculate the HYDROCODE_DESC field
to the ERP Number (ERP_XXXXXX.XXX) as in the example below.
Hydraulic Element Points in ArcHydro
Collecting HEPs – General Points, con’t.
To populate the HYDROCODE_DESC field for GENERAL POINTS,
- Select the points (Shift- or CTRL-click to select multiple points)
- Right-click on the HYDROCODE_DESC heading and choose the
Field Calculator
- Enter “ERP_XXXXXX.XXX” into the dialog window (quotes are needed)
- Press OK to calculate
- Close the table
Dialog Window
Hydraulic Element Points in ArcHydro
Collecting HEPs
Continue until all HEPs are collected
Hydraulic Element Points in ArcHydro
That’s all there is to collecting HEPs!!
Hydraulic Element Points in ArcHydro