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Nayal, M. S.
- Raingauge Density for Small Watershed
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Indian Forester, Vol 95, No 2 (1969), Pagination: 98-101Abstract
Determination of areal rainfall amount is essential to most hydrologic investigations. To measure 'true' rainfall, various raingauge installed at a density of 1.94 to 39.80 hectares per raingauge, at Soil Conservation Farm, Dehra Dun have shown that the variation in each storm recorded in 5 years (comprising 137 storms of more than 10.0 mm) was within '5 percent level of significance' and therefore one raingauge up to watershed area of 370 hectares is sufficient. In case the subwatersheds within this size large watershed, are gauged, one raingauge for each subwatershed may be installed as for taking more details. Further studies to determine rain gauge density for larger areas than 370 hectares are required to be conducted under local condition.
- Comparison of Performance of Inexpensive Raingages of Different Diameters
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For use of extension departmepts and also where research requires large scale use of raingages, the inexpensive raingages can be constructed by using ordinary G.I. sheet Cylinder or G.I. pipe of diameter between 7.5 to 12.5 cm The depth of rainfall can be directly measured by observing the water accumulated depth in the cylinder. The cost involved in these types of raingages may vary (depending on the material used) from Rs. 5/- to Rs. 20/- per raingage.
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Indian Forester, Vol 97, No 4 (1971), Pagination: 216-219Abstract
Results of study conducted to find suitable raingages have shown that the cylinder having diameter of 7.5 to 12.5 cm record comparable data with standard raingage when installed at any height varying from 30 to 90 cm. The use of diameter less than 7.5 cm is not desirable as they record considerable high rainfall.For use of extension departmepts and also where research requires large scale use of raingages, the inexpensive raingages can be constructed by using ordinary G.I. sheet Cylinder or G.I. pipe of diameter between 7.5 to 12.5 cm The depth of rainfall can be directly measured by observing the water accumulated depth in the cylinder. The cost involved in these types of raingages may vary (depending on the material used) from Rs. 5/- to Rs. 20/- per raingage.