WMS:Orange County Unit Hydrograph: Difference between revisions

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[[Image:OCUnitHydroEditParam.jpg|thumb|400 px|''Edit Orange County Unit Hydrograph Parameters'' dialog]]
Unit hydrograph analysis is used for watersheds greater than 1 square mile (640 acres) in Orange County, California. Losses are accounted for by calculating an effective precipitation. Runoff hydrographs are computed using a unit hydrograph, which is developed using an S-graph. Use a small area hydrograph instead of a full blown unit hydrograph analysis for watersheds with a Tc < 25 min. WMS creates the input files required for HEC-1 to compute hydrographs for the Orange County unit hydrograph analysis. Much of the interface for the Orange County unit hydrograph analysis is similar to the [[WMS:HEC-1 Parameters|HEC-1 interface]] within WMS. Some of the processes specific to Orange County are described below:
Unit hydrograph analysis is used for watersheds greater than 1 square mile (640 acres) in Orange County, California. Losses are accounted for by calculating an effective precipitation. Runoff hydrographs are computed using a unit hydrograph, which is developed using an S-graph. Use a small area hydrograph instead of a full blown unit hydrograph analysis for watersheds with a Tc < 25 min. WMS creates the input files required for HEC-1 to compute hydrographs for the Orange County unit hydrograph analysis. Much of the interface for the Orange County unit hydrograph analysis is similar to the [[WMS:HEC-1 Parameters|HEC-1 interface]] within WMS. Some of the processes specific to Orange County are described below:
* [[WMS:Basin HEC-1 Cards|Basin data]]
* [[WMS:OC Unit Hydro Effective Precipitation|Effective precipitation]] &ndash; Losses are included in the precipitation rather than defining a loss method
* [[WMS:Basin HEC-1 Cards|Unit Hydrograph Method]] &ndash; Unit hydrographs are developed using Orange County S-graphs and lag time derived from the time of concentration computed in an [[WMS:Orange County Rational Method|Orange County Rational Method]] analysis
* [[WMS:Routing HEC-1 Cards|Routing]]
*# Stream/channel routing &ndash; A [[WMS:Routing HEC-1 Cards|convex routing method]] is included in HEC-1
*# Flow-through detention &ndash; Defines using [[WMS:Routing HEC-1 Cards|reservoirs]] or [[WMS:Routing HEC-1 Cards|storage routing]] in HEC-1
*# Flow-by detention &ndash; Defines using [[WMS:Diversion HEC-1 Cards|diversions]] in HEC-1


==OC Hydrograph Menu==
==OC Hydrograph Menu==
The ''OC Hydrograph'' menu, available in the Hydrologic Modeling module, has the following commands:
The ''OC Hydrograph'' menu, available in the '''Hydrologic Modeling Module''' [[File:Hydrologic Module Icon.svg|12 px]], has the following commands:
* '''Open HEC-1 File''' &ndash; [[WMS:HEC-1#Reading_Existing_Files|Reads in]] existing HEC-1 files.
* '''Open HEC-1 File''' &ndash; [[WMS:HEC-1#Reading_Existing_Files|Reads in]] existing HEC-1 files.
* '''Save HEC-1 File''' &ndash; [[WMS:HEC-1#Saving_Files|Generates]] a HEC-1 input file.
* '''Save HEC-1 File''' &ndash; [[WMS:HEC-1#Saving_Files|Generates]] a HEC-1 input file.
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* '''Read Solution''' &ndash; Opens the HEC-1 solution files. Requires a basin or outlet be selected.
* '''Read Solution''' &ndash; Opens the HEC-1 solution files. Requires a basin or outlet be selected.
* '''Job Control''' &ndash; Opens the [[WMS:HEC-1 Job Control|''HEC-1 Job Control'']] dialog.
* '''Job Control''' &ndash; Opens the [[WMS:HEC-1 Job Control|''HEC-1 Job Control'']] dialog.
* '''Define Storm''' &ndash; Brings up the [[WMS:OC Unit Hydro Design Storms|''Orange County Storm'']] dialog.
* '''Define Storm''' &ndash; Brings up the [[WMS:Orange_County_Unit_Hydrograph#Orange_County_Storm|''Orange County Storm'']] dialog.
* '''Edit Parameters''' &ndash; Opens the [[WMS:OC Unit Hydro Design Storms|''Edit Orange County Unit Hydrograph Parameters'']] dialog.
* '''Edit Parameters''' &ndash; Opens the ''Edit Orange County Unit Hydrograph Parameters'' dialog.
* '''Compute GIS Attributes''' &ndash; Brings up the [[WMS:Compute GIS Attributes|''Compute GIS Attributes'']] dialog.
* '''Compute GIS Attributes''' &ndash; Brings up the [[WMS:Compute GIS Attributes|''Compute GIS Attributes'']] dialog.


[[Category:WMS Menus|OC unit]]
[[Category:WMS Menus|OC unit]]
==Edit Orange County Unit Hydrograph Parameters==
[[Image:OCUnitHydroEditParam.png|thumb|400 px|''Edit Orange County Unit Hydrograph Parameters'' dialog]]
The ''Orange County Unit Hydrograph Parameters'' dialog is similar to the parameters dialog used by HEC-1. It contains the following options:
* [[WMS:Basin HEC-1 Cards|Basin data]]
* [[WMS:OC Unit Hydro Effective Precipitation|Effective precipitation]] &ndash; Losses are included in the precipitation rather than defining a loss method
* [[WMS:OC Unit Hydro Unit Hydrograph Method|Unit Hydrograph Method]] &ndash; Unit hydrographs are developed using Orange County S-graphs and lag time derived from the time of concentration computed in an [[WMS:Orange County Rational Method|Orange County Rational Method]] analysis
* [[WMS:OC Unit Hydro Small Area Hydrographs|Small Area Hydrograph]]
* [[WMS:Routing HEC-1 Cards|Routing]]
*# Stream/channel routing &ndash; A [[WMS:Routing HEC-1 Cards|convex routing method]] is included in HEC-1
*# Flow-through detention &ndash; Defines using [[WMS:Routing HEC-1 Cards|reservoirs]] or [[WMS:Routing HEC-1 Cards|storage routing]] in HEC-1
*# Flow-by detention &ndash; Defines using [[WMS:Diversion HEC-1 Cards|diversions]] in HEC-1
==Job Control==
The ''Job Control'' dialog is used to define general information about the Orange County Unit Hydrograph model. The model uses the same ''Job Control'' dialog used by the HEC-1 model. Selecting the '''Job Control''' command from the'' HEC-1'' or ''OC Hydrograph'' menu accesses this dialog. See the article [[WMS:HEC-1 Job Control|HEC-1 Job Control]] for more information about this dialog.
For the OC hydrograph projects, note the following:
; Computational Time Interval : The computational time interval entered here will be used to computed the effective precipitation and unit hydrograph.
; Expected Value Analysis : Toggle this checkbox on to do an expected value analysis. Effective precipitation values and losses will be automatically updated for each sub-area if they have already been computed.
==Orange County Storm==
[[File:OrangeCountyStorm.png|thumb|325 px|The ''Orange County Storm'' dialog]]
Define the point precipitation values that WMS will use to compute the design storm by selecting '''Define Storm''' in the ''OC Hydrograph'' menu. There are three types of storms: single-day event, multi-day event with flow-through detention, and multi-day event with flow-by detention. Choose a frequency and storm duration (for multi-day events). The antecedent moisture condition (AMC-I, AMC-II, AMC-III) that should be used to compute losses is displayed.
If the design storm event is changed, WMS automatically updates the effective precipitation for all sub-areas in which effective precipitation was previously defined.


==Saving a Simulation==
==Saving a Simulation==
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* [[WMS:Orange County Hydrology|Orange County Hydrology]]
* [[WMS:Orange County Hydrology|Orange County Hydrology]]
* [[WMS:HEC-1 Parameters|Editing HEC-1 Parameters]]
* [[WMS:HEC-1 Parameters|Editing HEC-1 Parameters]]
* [[WMS:OC Unit Hydro Job Control|Job Control]]
* [[WMS:OC Unit Hydro Design Storms|Design Storms]]
* [[WMS:OC Unit Hydro Small Area Hydrographs|Small Area Hydrographs]]
* [[WMS:OC Unit Hydro Small Area Hydrographs|Small Area Hydrographs]]
* [[WMS:OC Unit Hydro Using GIS Data|Using GIS Data]]
* [[WMS:OC Unit Hydro Using GIS Data|Using GIS Data]]
* [[WMS:HEC-1#Run Analysis|Running a HEC-1 Analysis]]
* [[WMS:HEC-1#Run Analysis|Running a HEC-1 Analysis]]
* [[WMS:OC Unit Hydro Post Processing|Post Processing]]





Latest revision as of 15:59, 14 December 2023

Unit hydrograph analysis is used for watersheds greater than 1 square mile (640 acres) in Orange County, California. Losses are accounted for by calculating an effective precipitation. Runoff hydrographs are computed using a unit hydrograph, which is developed using an S-graph. Use a small area hydrograph instead of a full blown unit hydrograph analysis for watersheds with a Tc < 25 min. WMS creates the input files required for HEC-1 to compute hydrographs for the Orange County unit hydrograph analysis. Much of the interface for the Orange County unit hydrograph analysis is similar to the HEC-1 interface within WMS. Some of the processes specific to Orange County are described below:

OC Hydrograph Menu

The OC Hydrograph menu, available in the Hydrologic Modeling Module Hydrologic Module Icon.svg, has the following commands:

  • Open HEC-1 FileReads in existing HEC-1 files.
  • Save HEC-1 FileGenerates a HEC-1 input file.
  • Check Simulation – Launches the HEC-1 Model Check.
  • Run Simulation – Launches the HEC-1 model run.
  • Read Solution – Opens the HEC-1 solution files. Requires a basin or outlet be selected.
  • Job Control – Opens the HEC-1 Job Control dialog.
  • Define Storm – Brings up the Orange County Storm dialog.
  • Edit Parameters – Opens the Edit Orange County Unit Hydrograph Parameters dialog.
  • Compute GIS Attributes – Brings up the Compute GIS Attributes dialog.

Edit Orange County Unit Hydrograph Parameters

Edit Orange County Unit Hydrograph Parameters dialog

The Orange County Unit Hydrograph Parameters dialog is similar to the parameters dialog used by HEC-1. It contains the following options:

Job Control

The Job Control dialog is used to define general information about the Orange County Unit Hydrograph model. The model uses the same Job Control dialog used by the HEC-1 model. Selecting the Job Control command from the HEC-1 or OC Hydrograph menu accesses this dialog. See the article HEC-1 Job Control for more information about this dialog.

For the OC hydrograph projects, note the following:

Computational Time Interval
The computational time interval entered here will be used to computed the effective precipitation and unit hydrograph.
Expected Value Analysis
Toggle this checkbox on to do an expected value analysis. Effective precipitation values and losses will be automatically updated for each sub-area if they have already been computed.

Orange County Storm

The Orange County Storm dialog

Define the point precipitation values that WMS will use to compute the design storm by selecting Define Storm in the OC Hydrograph menu. There are three types of storms: single-day event, multi-day event with flow-through detention, and multi-day event with flow-by detention. Choose a frequency and storm duration (for multi-day events). The antecedent moisture condition (AMC-I, AMC-II, AMC-III) that should be used to compute losses is displayed.

If the design storm event is changed, WMS automatically updates the effective precipitation for all sub-areas in which effective precipitation was previously defined.

Saving a Simulation

Save only the HEC-1 input files using the Save Simulation command in the OC Hydrograph menu. This will only save the hydrologic tree and the HEC-1 input parameters at each of the tree nodes. Terrain data, feature data, and GIS data will not be saved unless saving a WMS project file using the Save command in the File menu.

Post Processing

By default WMS will read in the hydrographs computed by HEC-1 and display small icons representing the hydrographs next to their corresponding tree nodes. It is possible to view a larger plot of the hydrograph by selecting a hydrograph icon and choosing the Open Hydrograph Plot in the Display menu or just by double-clicking the icon. Right-click on the hydrograph plot for options that format, print, and export the plot and its data.

Use the commands on the Hydrographs menu to open or delete HEC-1 results (*.sol file) as well as to view and export the data.

View the HEC-1 output file by using the Edit File command in the File menu to open the *.out file. This file provides a detailed report of the HEC-1 calculations.

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