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| In TR20, there are two different ways to define precipitation. Precipitation is defined by selecting the '''Job Control''' command from the ''TR20'' menu. Then, select the '''Define Precipitation''' button to define precipitation over the entire watershed. You can define precipitation by using either a standard SCS rainfall distribution or by defining a custom rainfall distribution. If a custom rainfall distribution is used, you must define a custom rainfall distribution in the XY Series Editor. If one of the standard SCS rainfall distributions are used, you can select one of the following rainfall types:
| | #REDIRECT [[WMS:TR-20 Job Control Parameters]] |
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| * Emergency Spillway and Freeboard
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| * Type I: 24 hours
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| * Type II: 24 hours
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| * Type IA: 24 hours
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| * Type III: 24 hours
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| * Type II: 48 hours
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| For all the standard distributions, you must define the rainfall depth. For the dimensionless distribution, you must also define the rainfall duration. You only need to define the depth and/or duration of the rainfall for a custom distribution if one of the units entered in the ''XY Series Editor'' is dimensionless.
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| ==Related Topics==
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| * [[WMS:TR-20|TR20 Overview]]
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| * [[WMS:TR-20 Edit Parameters|Editing TR20 Parameters]]
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| * [[WMS:TR-20 Job Control Parameters|Entering Job Control Parameters]]
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| * [[WMS:Where Can I Get Data?|Obtaining Precipitation Data]]
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| {{WMSMain}}
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