V. a. Finish Curve Number Lookup Table

I.Open and Prepare Map Data
- a.Open ArcGIS
- b.Open a new empty map
- c.Open Data Layers
  - i.Adding a single layer
  - ii.Adding multiple layers
- d.Organizing data layers
- e.Viewing the whole Map
  - i.Opening the "Tools" toolbar
  - ii.Zooming in ArcGIS
- f.Saving the Project
II.Setting Color and Symbol Schemes
III.Delineate Watershed
- a.Open Editor Toolbar
- b.Organize Layers for best view of topography
- c.Draw the watershed boundary
  - i.Delineate the watershed manually using the editor
  - ii.Calculate the Area of the Watershed
IV.Overlay Soil and Landuse data
V.Create SCS Curve Number Map
- a.Finish Curve Number Lookup Table
- b.Create and symbolize Curve Number layers
  - i.Create layer showing areas with a Curve Number of 100
    - 1.Using Definition Query tool
    - 2.Create Layer File
  - ii.Create the remaining Curve Number layers (“CN_84”, “CN_80”, etc.)
    - 1.Create layer showing areas with a Curve Number of 84
    - 2.Create layer file
  - iii.Group and symbolize all curve number layers
    - 1.Group the layers
    - 2.Symbolize “Curve Number” layer
- c.Complete Composite Curve Number Table
  - i.Calculate area of land with curve number value of 100
  - ii.Repeat steps for each individual remaining curve number layer to complete the Composite Curve Number Table
VI.Creating a Layout
- a.Setting Print Area
- b.Layout View
- c.Page orientation
- d.Setting map properties
- e.Adding map features

Estimated time:
2 minutes

Use the Table of Runoff Curve Numbers (SCS, 1986) to determine a curve number for each combination of landuse (aka GRIDCODE) and Hydrologic Soil Group.

In this exercise, you will:

Review SCS CN Method
Complete CN Lookup Table

Text Version:

Use Runoff Curve Number Table provided in the handout to determine the curve number for each Landuse and Hydrologic Soil Group

For water use a curve number of 100

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