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Back to Practice Questions
CivilWater Resources Management
PrevNext

Symon's rain gauge is

A

Tipping-bucket gauge

B

weighing type guage

C

Float recording gauge

D

Non-recording gauge

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilWater Resources Management
Option D

Non-recording gauge

Quick Summary:

Symon's rain gauge is a non-recording type gauge used to measure rainfall at a specific observation station. It does not provide a continuous temporal distribution of rainfall but rather gives the total amount of precipitation occurred between two successive observations.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

Symon's rain gauge is a non-recording type gauge used to measure rainfall at a specific observation station. It does not provide a continuous temporal distribution of rainfall but rather gives the total amount of precipitation occurred between two successive observations.

ЁЯФв Key Formulas

d=VAd = \frac{V}{A}d=AVтАЛ тАФ Rainfall depth (ddd) is the ratio of collected volume (VVV) to the area of the collector (AAA).

тЪЩя╕П Working Principle

It consists of a cylindrical vessel with a funnel and a receiving bottle inside. The rain collected by the funnel is stored in the bottle; at fixed time intervals (usually 8:30 AM), the water is measured using a graduated cylinder designed specifically for the gauge's dimensions. Because it is manually read, it cannot record the intensity or variation of rainfall over time.

ЁЯУМ Key Points
  • тЦ╕

    It is the standard non-recording rain gauge used by the Indian Meteorological Department (IMD).

  • тЦ╕

    The diameter of the collector is usually 127 mm.

  • тЦ╕

    It provides cumulative rainfall data, not intensity.

  • тЦ╕

    Manual intervention is required to read the gauge.

тЬЕ Advantages
  • тЦ╕

    Simple in design and construction.

  • тЦ╕

    Low maintenance and cost-effective.

  • тЦ╕

    Robust and less prone to mechanical failure.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Cannot record the intensity of rainfall.

  • тЦ╕

    Requires manual labor for daily readings.

  • тЦ╕

    Time of onset and duration of rainfall cannot be determined.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Basic hydrological surveys.

  • тЦ╕

    Agricultural monitoring where only daily totals are needed.

  • тЦ╕

    Remote areas with limited technical infrastructure.

ЁЯФД Comparison Table
FeatureSymon's GaugeTipping-Bucket

Record Type

Non-Recording

Recording

ЁЯУД Additional Information
  • тЦ╕

    The standard observation time in India is 08:30 IST.

  • тЦ╕

    Tipping-bucket, weighing type, and float-type gauges are all recording types used to plot mass curves of rainfall.

ЁЯУК Diagram / Illustration
Symon's Gauge PrincipleTotal Volume of RainCollector Area
Rainfall\Depth=VolumeAreaRainfall \Depth = (Volume / Area)Rainfall\Depth=AreaVolumeтАЛ
Collection Vessel
тЬЕ

D is correct тАФ Symon's rain gauge is a non-recording instrument that collects precipitation for manual measurement at specific intervals.

Core Concepts Used
Click any tag to open in AI Tutor
Precipitation Measurement Hydrological Instrumentation Non-recording Rain Gauges
ЁЯТб EXAM TIP

Always remember that 'Non-recording' gauges provide depth, while 'Recording' gauges provide intensity (i=dhdti = \frac{dh}{dt}i=dtdhтАЛ).

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