- How is excess rainfall calculated?
- How is rainfall depth calculated?
- How is total runoff calculated?
- How do you plot a rainfall Hyetograph?
- What is the SCS method?
- What do you call a graph plotted for discharge vs time?
- What is excess rain?
- What is a rainfall Hyetograph?
- How do you calculate a Hyetograph?
- What is rainfall mass curve?
- What is rainfall effectiveness?
- How do you make a hydrograph?
- What is the difference between hydrograph and Hyetograph?
- What is mass curve?
How is excess rainfall calculated?
The volume of rainfall available for direct surface runoff.
It is equal to the total amount of rainfall minus all abstractions including interception, depression storage, and infiltration..
How is rainfall depth calculated?
Here’s what you’ll need to do:Measure the diameter of the bucket at the level of the rain. … Measure the diameter of the bucket at the bottom in the same way.Calculate the average of the two diameters.Divide by two to find the average radius.Find the average volume of rain = Depth x radius x radius x 3.14.More items…
How is total runoff calculated?
Simple, straightforward methods of calculating runoff can tell you the amount of water that storms bring to the earth. For a given surface area such as a roof or yard, multiply the area by the inches of rainfall and divide by 231 to obtain the runoff in gallons.
How do you plot a rainfall Hyetograph?
3. HYETOGRAPH A hyetograph is a graphical representation of the relationship between the rainfall intensity and time. It is the plot of the rainfall intensity drawn on the ordinate axis against time on the abscissa axis.
What is the SCS 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. … The curve number is based on the area’s hydrologic soil group, land use , treatment and hydrologic condition.
What do you call a graph plotted for discharge vs time?
A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs).
What is excess rain?
rainfall excess or ” net rain” is used to denote that part of the rainfall, which is left after the subtraction of the above mentioned losses, and is expressed as the depth of water in mm over a given surface area for a specified period of time.
What is a rainfall Hyetograph?
A hyetograph is a graphical representation of the distribution of rainfall intensity over time. … The maximum intensity may not be reached as uniformly as shown in the SCS hyetographs.
How do you calculate a Hyetograph?
The procedure to convert a rainfall excess hyetograph to a rainfall excess hydrograph is explained in the quote at the start of the blog. We need to: Multiply the rainfall excess by the catchment area (converts rainfall to a volume) Divide by the time step (to calculate volume per unit time)
What is rainfall mass curve?
The mass curve of rainfall is a plot of the accumulated precipitation against time,plotted in chronological order. Records of float type and weighing-bucket typegauges are of this form. A typical mass curve of rainfall at a station during a storm is shown in fig 6.1.
What is rainfall effectiveness?
Effective rainfall (or precipitation) is equal to the difference between total rainfall and actual evapotranspiration. Effective rainfall can be calculated directly from the climatic parameters and the useable ground reserves (RU).
How do you make a hydrograph?
Step 1: Select Appropriate Precipitation Event. … Step 2: Remove Baseflow Contribution. … Step 3: Calculate Volume of Quick-Response Runoff ” … Step 4: Determine Excess Precipitation Depth for the Basin. … Step 5: Adjust The Quick-Response Hydrograph to Represent 1 Unit of Excess. … Step 6: Determine Duration. … Final Unit Hydrograph.More items…
What is the difference between hydrograph and Hyetograph?
A hydrograph is graphically plot of discharge of a natural system for river versus time. … A hyetograph is a plot of intensity of rainfall against the time interval it is usually represented buy a bar chart. 2.
What is mass curve?
A plotting of the cumulative values of a variable as a function of time. This is applied especially to mass curves of rainfall in storm studies, to departures of various weather elements from normal, and to streamflow data for reservoir studies.