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TR55 - Urban Hydrology for Small Watersheds Tutorial

TR-55 Capabilities

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TR55 - Urban Hydrology for Small Watersheds Tutorial

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    1. TR55 - Urban Hydrology for Small Watersheds Tutorial This tutorial demonstrates the new TR55 model. You will learn how to: Create an Input File Run TR55 View Output

    2. TR-55 Capabilities & Limitations Maximum Area Number of Sub-areas Tc for any sub-area Number of reaches Types of reaches Channel Routing Structure Routing Structure Types Structure Trial Sizes Rainfall Depth 25 square miles 1-10 0.1 hour < Tc < 10 hours 0-10 Channel or Structure Muskingum-Cunge Storage-Indication Pipe or Weir 1-3 Default or user-defined 0-50 inches (0-1,270mm)

    3. Cont. Capabilities & Limitations Rainfall Distributions Rainfall Duration Dimensionless Unit Hydrograph Antecedent Runoff Condition NRCS Type I, IA, II, III, NM60, NM65, NM70, NM75, or user-defined 24-hour Standard peak rate factor 484 or user-defined 2 (average)

    4. Minimum Data Requirements Data required for a single sub-area run can be entered on the TR-55 Main Window. These data include: Identification Data - User, State, and County Dimensionless Unit Hydrograph Rainfall Location Identifier Sub-area Data (Name, flows to reach/outlet, area, runoff curve number, & time of concentration)

    5. TR-55 Sub-area/Reach Concepts TR-55 represents the watershed as a system of sub-areas and reaches. “Sub-areas” are the watersheds that generate hydrographs that feed into the upstream end of a reach.

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