Tr 55 manual
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Using an arbitrary user-defined method may only trigger a request for justification, which is not really worth the time needed to enter the SCS TR-55 or other methods. Set a Minimum Allowable Time of Concentration of 5 min. We need to specify a minimum time of concentration (TOC) to prevent high runoff values. IDF curves are often provided at 5 2-8 (210-VI-TR-55, Second Ed., June 1986) Table 2-2d Runoff curve numbers for arid and semiarid rangelands 1/ Curve numbers for—– Cover description —– —– hydrologic soil group —– Hydrologic Cover type condition 2/ A 3/ BC D Herbaceous—mixture of grass, weeds, and Poor 80 87 93 low-growing brush, with brush the Fair 71 81 89
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Table 4‐1 TR‐55 Manual. 9/26/2016 2 Equation 2‐3 (Figure 2‐1) TR‐55 Manual Change in Runoff Depth Table 2.1 TR‐55 Manual. 9/26/2016 3 What Happens When Adjusted HSGs
Data Recorder TR-55i is referred to as the «Unit» in this manual. Specifications Device Name TR-55i Measurement Item (*1) Temperature / Voltage / 4-20mA / Pulse Count Logging Capacity 16,000 readings Recording Interval Select from 15 choices: 1, 2, 5, 10, 15, 20, 30 sec. or 1, 2, 5, 10, 15, 20, 30, 60 min. Recording Mode
The following example is from the TR-55 manual (SCS Land Use Description Hydrologic Soil Group; Source: Soil Conservation Service TR-55; Residential: A: B: C: D: Average Lot Size: 1/8 acre or less: 77: 85: 90: 92: 1/4 acre A full description of curve numbers is available from the NRCS in the TR-55 documentation manual.
Find Your Local Service Center. USDA Service Centers are locations where you can connect with Farm Service Agency, Natural Resources Conservation Service, or Rural Development employees for your business needs.
WMS uses exhibit 5 in the TR-55 manual for the tabular hydrograph method. Values for the Tc, Tt, Ia/P, and Am*Q are used as input values for this table, and all hydrograph values are linearly interpolated or extrapolated from the values for Tc, Tt, and Ia/P. The difference between the WMS method and the method described in the manual is the WMS
The TR-55 computer model has been revised and completely rewritten. As a windows based program, the input and editing windows are a big improvement over the DOS version. The new WinTR-55 uses the WinTR-20 program as the driving engine for more accurate analysis of the hydrology of the small watershed system being studied.
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U.S. Department of Agriculture FL-ENG-21C Natural Resources Conservation Service 04/04 Tr 55 Worksheet 4: Graphical Peak Discharge Method

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