What does a curve number represent?
The Curve Number is a dimensionless parameter indicating the runoff response characteristic of a drainage basin. In the Curve Number Method, this parameter is related to land use, land treatment, hydrological condition, hydrological soil group, and antecedent soil moisture condition in the drainage basin.
What is the curve number of water?
CN values range from 100 (for water bodies) to approximately 30 for permeable soils with high infiltration rates.
What is the curve number for wetlands?
If the wetland is saturated or inundated with water, a high Curve Number of 98-100 can be used to represent the negligible infiltration capability. A lower CN value may be appropriate if the wetland is not saturated, and still has some absorption capability.
What is the TR 55 method?
Technical Release 55 (TR-55) presents simplified procedures to calculate storm runoff volume, peak rate of discharge, hydrographs, and storage volumes required for floodwater reservoirs. These procedures are applicable in small watersheds, especially urbanizing watersheds, in the United States.
What is CN value?
The CN value is a primary input parameter for the SCS runoff equation, as used by HydroCAD. High CN values (such as 98 for pavement) cause most of the rainfall to appear as runoff, with minimal losses.
What is a high curve number?
The runoff curve number, , is then related. has a range from 30 to 100; lower numbers indicate low runoff potential while larger numbers are for increasing runoff potential. The lower the curve number, the more permeable the soil is.
What is SCS curve method?
The SCS curve number method is a simiple, widely used and efficient method for determining the approxient amount of runoff from a rainfall even in a particular area. Although the method is designed for a single storm event, it can be scaled to find average annual runoff values.
How do you find the runoff curve number?
The weighted CN is calculated by taking the sum of each CN value multiplied by its fraction of the total subcatchment area. The sum is (usually) rounded to the nearest whole number, as described below. The rounded result is used for all calculations and reports.
What unit is CSM?
The Command Sergeant Major (CSM), as the most senior sergeant of a color-bearing unit, began in December 1975. In contrast, the duties of a Sergeant Major have been defined in the US Army since the days of von Steuben (1779).
What is SCS 55?
Technical Release 55 (TR-55) presents simplified procedures to calculate storm runoff volume, peak rate of discharge, hydrographs, and storage volumes required for floodwater reservoirs. These procedures are applicable in small watersheds, especially urbaniz- ing watersheds, in the United States.
Who is the new SMA Army?
Michael A. Grinston
of the Army Michael A. Grinston was sworn in as the 16th Sergeant Major of the Army on Aug. 9, 2019. Grinston has held every enlisted leadership position in artillery, ranging from cannon crewmember to command sergeant major.