![](graphics/loading6.gif)
![](graphics/clear_space.gif)
Layers | Tools | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Watershed
Digital Raster Graphic (DRG)
LULC
Soil Type
|
|
|||||||||||||||||||||||||||
Layers | Tools | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Watershed
Digital Raster Graphic (DRG)
LULC
Soil Type
|
|
|||||||||||||||||||||||||||
Overview
The curve number was developed by the USDA Coil Conservation Service for Hydrological abstraction. The curve number varies from 1 to 100, being a function of the following runoff producing catchment properties: (1) Hydrological soil type,(2) land use and treatment, (3) ground surface condition, and (4) antecedent moisture condition. It is limited to the calculation of runoff depth and does not take into account temporal variations of rainfall variations. For un-gauged watersheds estimates of runoff curve numbers are given in tables.
More Resources on CN Analysis
Download CN Tables
Example of CN calculation and analysis
Your Task
Work with the Land Use data to calculate the Curve Number using the Runoff Curve Number tables. Download and open this WORD file and use it as a template to record your answers.
Once finished, click Next to continue.