![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeProfile.png\")
<\/p>\nThis task allows you to model a variety of orifice shapes and configurations. It provides plenty of graphs, grid-style numerical outputs, a rating table and formal printed reports.<\/p>\n
An orifice is an opening with a closed perimeter through which water flows. If this opening flows only partially full, then it becomes a weir. Studio Express only models orifices that flow full with a head greater than or equal to 1\/2 the orifice Diameter or Rise.<\/p>\n
<\/p>\n
The following Orifice shapes are available:<\/p>\n
A tailwater condition can be specified for any Orifice.<\/p>\n
Studio Express quickly calculates:<\/p>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDiagram.png\")
<\/p>\n
The input requirements are designed to be minimal but thorough. To enter data, type in the value or select from a drop-down input box, and press [Enter] or the [Tab] key. Following is a description of those required items. Once the data is input, results are computed by clicking the [Compute] button at the bottom of the input grid.<\/p>\n
Data is divided into three categories;<\/p>\n
Following is a description of each. While entering data for the first time, the canvas will automatically display help diagrams to assist in your data entry and the input grid will show only those data items pertaining to the selected orifice type.<\/p>\n
Orifice Name<\/b>
\nOptional but it is a recommended input as it is this label that identifies the section on the Orifices List and reports.<\/p>\nOrifice Data<\/h2>\n
Orifice Type<\/b>
\nSelect the type of orifice from the drop-down list box or visually select from the Canvas.<\/p>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificesChoices.png\")
<\/p>\n
Inputs needed depend on the orifice type selected.\u00a0Below is a description of all inputs.<\/p>\n
Orifice Diameter<\/b>
\nEnter the diameter of the orifice in inches (mm).<\/p>\n
Rise
\n<\/b> <\/b> Enter the height of the rectangular orifice in inches (mm).<\/p>\n
Span<\/strong> Centroid Elevation Max Headwater<\/strong> Orifice Coefficient (Co) No. Holes (Plate<\/em>)<\/strong> Plate Height (Plate<\/em>)<\/strong> Invert Elevation (Plate<\/em>)<\/strong> Discharge Method<\/strong> Q vs. Depth<\/strong> Known Flow Rate<\/strong> \r\n \t\t\t\t\tEnter zero and the software will insert the peak Q from the current hydrograph in the Hydrology task. \t\t\t\t<\/p>\r\n \t\t\t \t\t\t\r\n \t\t<\/div>\r\n \t\t\n Known Head<\/strong> User-Defined Flows<\/strong> You have the option of specifying a tailwater elevation to model fully or partially submerged orifices.<\/p>\n In the orifice above, a tailwater elevation was entered which resulted in a fully submerged orifice. The resulting Head is the difference between the headwater and tailwater.<\/p>\n Once you entered your data, click the [Compute] button at the bottom of the input grid.<\/p>\n Studio Express will first do a data check to make sure the inputs are okay. You’ll then be presented with the results.<\/p>\n You can clear the data from the input grid by using the [Clear] button.<\/p>\n Once the results have been computed, you’ll have a variety of ways to view them. You can plot sections, which include Section and Profile views, or you can plot a Rating Curve. Sections and Rating Curves are selected using the toggle buttons at the top left of the canvas. To view the different sections, simply click on Profile or Section at the bottom of the canvas drawing.<\/p>\n Note that Studio Express arbitrarily positions the holes in rows and columns in perforated plates. This is cosmetic, for illustration purposes, and has no affect on the calculations. The holes can be positioned in the field in any order as long as they are evenly distributed from top to bottom. See Computational Methods<\/a> for complete description.<\/p>\n The software arbitrarily sets the Datum (the lowest elevation shown on the Section and Profile graphs). You can modify this elevation using the Datum arrow Up\/Down buttons. This will not affect the calculated results, however since Studio Express uses projectile motion concepts for determining the distance the free-flow jet travels, you will see a change in the path of the jet.<\/p>\n Click the [Refresh] button to return the plot to it’s defaults.<\/p>\n","protected":false},"excerpt":{"rendered":" This task allows you to model a variety of orifice shapes and configurations. It provides plenty of graphs, grid-style numerical outputs, a rating table and formal printed reports. An orifice is an opening with a closed perimeter through which water flows. If this opening flows only partially full, then it…<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[20],"ht-kb-tag":[],"class_list":["post-370","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-orifices"],"_links":{"self":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/comments?post=370"}],"version-history":[{"count":15,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/370\/revisions"}],"predecessor-version":[{"id":568,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb\/370\/revisions\/568"}],"wp:attachment":[{"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/media?parent=370"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb-category?post=370"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-json\/wp\/v2\/ht-kb-tag?post=370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nEnter the width of the rectangular orifice in inches (mm).<\/p>\n
\n<\/strong>Enter the elevation of the center of the orifice opening. Invert elevation plus 1\/2 of the Diameter or Rise in feet (m).<\/p>\n
\nEnter the total head to be analyzed. This is measured vertically from the Centroid Elevation (Invert Elevation for Plates) in feet (m).<\/p>\n
\n<\/b> <\/b>Enter the orifice coefficient. This will automatically be set to the default coefficient as set in the Settings.<\/p>\n
\nEnter the total number of holes (orifices) in an Orifice Plate.<\/p>\n
\nEnter the height of the Plate measured vertically from the Invert Elevation, not centroid elevation.<\/p>\n
\nEnter the elevation of the Orifice Plate’s invert.<\/p>\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlateProfDiag.png\")
Discharge Data<\/h2>\n
\nSelect the discharge method from the drop-down list box. You can develop flows by specifying:<\/p>\n\n
\nFor Q vs Depth, enter the number of increments or depth values to be used for the Rating table. The default value is 10. The total cannot exceed 100. For example, if the Total Depth is 6 and the Increments = 12, Studio Express will compute Q\u2019s for each 6\/12 or every 0.5 feet of depth. The Results Grid will populate with 12 rows beginning at 0.5 feet up to 6.0.<\/p>\n
\nEnter a known flow rate and Studio Express will compute a corresponding Orifice head.<\/p>\n \t\t\r\n \t\t\tInsert a Q from Hydrology!<\/span> \t\t\t \t\t\t\t
\nEnter a known head and Studio Express will compute a corresponding discharge. This value must be <= Max Headwater.<\/p>\n
\nThis method allows you to enter a custom set of up to ten unique Q’s. These may, for example, correspond to flows previously determined. Data can also be copied and pasted by right-clicking on the table.<\/p>\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/UserDefQsScreen.png\")
<\/p>\nTailwater<\/h2>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeTw.png\")
Computing Results<\/h2>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/ComputeClearButs.png\"){kind=spacer}
<\/p>\nPlot Options<\/h2>\n
![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PlotOptionsWeirs.png\")
<\/p>\n![\"\"](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/PerfPlateSec.png\")
<\/p>\nAdjusting the Datum<\/h3>\n
![\"Orifice](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDatumUnAdj.png\")
![\"Orifice](\"https:\/\/learn.hydrologystudio.com\/studio-express\/wp-content\/uploads\/sites\/6\/2018\/05\/OrificeDatumAdj.png\")