Mass Curve • It is
a plot of cumulative volume of water that can be stored from a stream flow versus time in days, weeks or months
. It shows a mass curve, Maximum intercept between line AB and mass curve is known as reservoir capacity • The unit used for storage is either cubic metre or day-second-metre.
What is mass curve in watershed hydrology?
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 mass curve?
A mass diagram is
the plot of accumulated inflow (i.e. supply) or outflow (i.e. demand) versus time
. The mass curve of supply (i.e. supply line) is, therefore, first drawn and is superimposed by the demand curve. … Calculate and plot the cumulative demand against time, and thus plot the mass curve of demand.
What is the purpose of using the mass curve method?
The mass curve technique, proposed by Rippl in 1883 to
determine storage capacity of a reservoir
, is a graphical technique. To determine minimum required storage, the mass curve of inflow and the mass curve of demand are accumulated separately.
What is the difference between Hyetograph and mass curve?
A hyetograph is a
plot of the intensity of rainfall against the time
in the hyetograph is derived from the mass curve and is usually represented as a bar chart (Fig. … The area under a hyetograph represents the total precipitation received in that period.
What is rainfall mass curve?
The mass curve of rainfall is
a plot of the cumulative depth of rainfall against time, plotted in chronological order
. The steepness of the curve indicates the intensity of rainfall. It is also known as station rainfall. The rainfall data of a particular station is known as point rainfall.
How is flow duration curve prepared?
To prepare a flow-duration curve, the daily, weekly, or monthly flows during a given period are
arranged according to magnitude, and the percent of time during which the flow equaled or exceeded the specified values is computed
.
What is mass inflow curve?
Mass inflow is a
curve which represents the cumulative flow in a reservoir at any particular instance
. It is a plot between cumulative inflow in the reservoir with time. It can be prepared with the help of a hydrograph of the river for the dam site for a large number of years.
What are watershed characteristics?
Characteristics of Watersheds. A watershed is an area of land that forms the drainage system for a stream or river. … Watersheds are characterized by
the location of the pour-point, or mouth, of the main flow of water to which all the other points of flow join and eventually drain from the watershed
.
What types of water does a watershed include?
The watershed consists of
surface water–lakes, streams, reservoirs, and wetlands–and all the underlying groundwater
. Larger watersheds contain many smaller watersheds. It all depends on the outflow point; all of the land that drains water to the outflow point is the watershed for that outflow location.
What is rippl’s curve?
The
flow–mass curve
is also known as Rippl’s mass curve after Rippl (1882) who suggested its use first. Figure 5.9 shows a typical flow–mass curve. Note that the abscissa is chronological time in months in this figure. … dV The slope of the mass curve at any point represents = Q = rate of flow at that dt instant.
What is double mass curve method?
Abstract: The double- mass curve is
used to check the consistency of many kinds of hydrologic data by comparing date for a single station with
that of a pattern composed of the data from several other stations in the area. The double-mass curve can be used to adjust inconsistent precipitation data.
How will you determine the reservoir yield by the method of mass curve?
In this case also the required capacity of the reservoir can be determined in the same way by superimposing the demand curve on the mass curve from the high points (or beginning of the dry period) till the two meet again.
The largest vertical intercept between the
two curves gives the required reservoir capacity.
How do you do a hyetograph?
Convert to a hydrograph
Multiply the rainfall excess by the
catchment area (converts rainfall to a volume) Divide by the time step (to calculate volume per unit time) Ensure flow is allocated to the correct time step – the rainfall during a time step produces the instantaneous flow at the end of the time step.
What is hyetograph and hydrograph?
As nouns the difference between hyetograph and hydrograph
is that
hyetograph is a graphical representation of rainfall over time
while hydrograph is a graph of flow past a point in a river versus 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.
