Section 257 in Rajasthan Land Revenue (Land Records) Rules, 1957
257. Inspection of Rain-gauges.
(1)It is of great importance that the rain-gauge should be inspected as the observers often allow large change to take place in the exposure of a gauge without being aware that action is necessary.The Inspecting Officer shall be Collector, Sub-Divisional Officer and Tehsildar and such other Officer as may be authorised by the Board of Revenue.(2)The object of the Inspecting Officer should be to determine:-(a)whether the instrument is suitably placed and is in good order;(b)whether the observer can take the rainfall measurements correctly and enter them properly in the rainfall records;(c)whether the rainfall records are properly and neatly kept and are in good order;(d)whether the observer makes his measurements at 8 30 A.M.; and(e)whether any part of the rain-gauge requires repairs or replacement.(3)In order to determine whether the instrument is suitably placed and in thoroughly good order he should ascertain:-(a)whether there are any trees growing up or houses being built which are likely to affect the exposure;(b)whether the gauge is firmly fixed so that it is not likely to be blown over;(c)whether the rim, when pressed home, is level. As all gauges are made level when first erected, it will not be necessary for the Inspector to use spirit level. He will need to see that no obvious displacement of the gauge has taken place; and(d)whether the rim of the mouth of the funnel is circular. All gauges are accurately measured before being issued, and unless the rim is obviously damaged or out of shape, it is not necessary to measure the diameter, which is generally 5 inches.(4)In order to ascertain whether the observer can measure the rainfall accurately and make entries correctly the glass receiver should be partially filled two or three times with different quantities of water, and the observer required to measure them and write down the entries. If he can do this correctly, nothing further is necessary; if not the Inspecting Officer should teach him fully.(5)The Inspecting Officer should also see that the prescribed rainfall book is in good condition and the entries are made carefully and neatly. He should also verify that the rainfall observer knows how to make entries in the various rainfall returns for local and Central Government authorities.
