this ppt describes about rain guage usage

1. Vigyan Ashram Pabal

2.  Study of water resources
 Used to design water harvesting structures
 Measure intensity of rainfall
 Helps collecting information of rainfall with
respect to time

3.  Device used for Measuring Rainfall quantity of
a particular area

4.  Recording Type Rain Guage
Most Commonly used rain guage having
collector surface
 Non Recording Type Rain Guage
A well calibrated system having equipments to
record on its own

5.  Following figure shows recording type rain
guage from Davis instruments installed at
Vigyan Ashram pabal
 This is a device having rain guage along with
other instruments like wind
measurement,temperature recordings etc
 This device communicates through wi-fi to an
console

6. Console
Instrument

7.  Following is the figure for rain guage

8.  Following is the image of non recording rain
guage installed at Vigyan Ashram
 It is a simple collector funnel and bottle
callibrated

9. From the figure given in previous slide
 Rain Guage is
 Having collecting area of 127 mm
 Placed averagely 4.5 feet above ground
The Rain guage has
 Collecting bottle and funnel as per standard
calibration

10.  Collector area parallel to ground
 Open surface area where there are no big
trees or building nearby

11.  Collected Rainfall is measured around 8:30
am
 The rainfall accumulated is put into a
measuring cylinder
 This measuring cylinder is standard and
callibrated
 Recording of rainfall is done daily

12. We know 2 things
 Volume of rain water collected(Vol)
 Area of the funnel/cup collecting surface(A)
Rainfall in mm = Vol of water/Area of collector

13.  At specific locations there are rain guages
 In India,usually it is 630 sq km between 2
rain guages
 Data collected are sent to weather station
 Accuracy is +/- 0.1mm

14.  Based on day to day basis rainfall is recorded
 Sum of all rainfall is done
 Rainfall for particular season is calculated
Advantages
 Statistics of various years can be calculated
 Average rainfall can be calculated