2.0

Table Of Contents
Contents
xvii
Specifying Which ASCII Text Editor to Use for Viewing and Editing the
Hydrology Files 544
Returning the Hydrology Settings to the Default Prototype Settings 545
Calculating the Runoff from Watershed Areas 545
Selecting a Runoff Calculation Method to Use 546
Selecting the Rainfall Frequency for a County 547
Editing and Defining Rainfall Frequency Values for Counties 549
Selecting the Rainfall Frequency for a County 550
Customizing the Rainfall Distribution File 550
Selecting and Editing the Runoff Curve Numbers for Different Soil
Groups and Cover Types 552
Selecting the Runoff Curve Numbers for Different Soil Groups and Cover
Types 554
Calculating a Composite (or Weighted) Curve Number for More Than
One Watershed or Subarea 554
Time of Concentration and Time of Travel 556
Calculating the Watershed Time of Concentration 557
Specifying the Sheet Flow 558
Specifying the Shallow Flow 560
Specifying the Channel Flow 561
Calculating the Watershed Time of Travel 562
Calculating the Peak Runoff Flow for an Area Using the Rational Method
564
Specifying the Rainfall Intensity 568
Displaying a Graph of the Intensity-Duration Frequency Data 569
Changing the Hydrology Plotting Settings 570
Changing the Main Title Settings 571
Changing the X-Axis Settings 572
Changing the Y-Axis Settings 574
Changing the Border Settings 576
Changing the Grid Settings 577
Changing the Grid Tick Settings 578
Changing the Individual Curve Preferences 579
Changing X,Y Data for an Individual Curve 580
Changing the Hydrology Graph Settings 582
Using the TR-55 Graphical Method to Calculate the Peak Runoff Flow 585
Calculating the Peak Runoff Flow by Using the TR-55 Graphical Method
587
Calculating the Peak Runoff Flow by Using the TR-55 Tabular Method
590
Saving TR-55 Tabular Runoff Calculations 592
Displaying the Calculated Hydrograph Data for Each Subarea and the
Entire Watershed 593