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Ullah, Wasi
- Planning for Hydrologic Studies on Small Watersheds
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Indian Forester, Vol 87, No 10 (1961), Pagination: 601-608Abstract
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- Multi-slot Divisor for Measurement of Runoff from Small Plots
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Indian Forester, Vol 88, No 8 (1962), Pagination: 579-584Abstract
No abstract- Soil Conservation in Lateritic Tracts of Bihar
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Indian Forester, Vol 88, No 12 (1962), Pagination: 913-925Abstract
No abstract- Torrent Control in the Doon Valley
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Indian Forester, Vol 93, No 7 (1967), Pagination: 475-481Abstract
The paper describes the torrent problems, the damage done and the bank protection measures found successful at the Dehra Dun Centre. A classification of torrent types has been attempted and important charaateristics of each type are mentioned. The physical processe involved in channel degradation and bank cutting are briefly brought out. Excess sediment is the major problem and is reaponsible for frequent channel shifting and inducing meanders in Saharanpur and Dehra Dun Districts. The performance of various bank and bad control measurea as applied to a torrent in Doon Valley has been discussed, Gabioni repelling spurs have given good results Other types of spurs like tree spur, log spur, etc., have been effective for limited period. Brush wood and boulder revetment have been successful for providing blanket protection. Bed control measures and their importance han been emphasized. The species suitable to stabilize sediment deposition have been given Pennisetum purpureum is one of the best species for this purpose. Deep planting has been suagested for good result. Maintenanve of works has been emphasized and timely maintenance can have lot of money spent on attending subsequent severe damage to the structures and other works.- Some Methods & Equipment for Run-off Measurements from Small Watersheds
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Indian Forester, Vol 93, No 8 (1967), Pagination: 588-593Abstract
The paper describes the technique used, the standards of accuracy followed and experience gained in measurement and analysis of run-off from small watersheds, at the Central Soil Conservation Research Demonstration and Training Centre, Dehra Dun. Nine watersheds from 2.5 acres to 200 acres are under gaging. Precalibrated triangular weirs and H Flumes have been used as artificial control. A sediment basin was found essential in one watershed, where excessive sedimentation disturbed the cross section of the approach channel. The sources of error and precautions essential for ensuring a high degree of accuracy in run-off measurement have been outlined, The following standards of reading discharge from the rating table have been followed: Less than 1 cusec - up to 3 decimal places Less than 10 cusecs- " 2 " Less than 100 " - " 1 " More than 100" - wbole figure The field checking of the laboratory rating of weirs has not been found practicable due to flashy flows. But the desirability of checking these ratings in the field should be kept in view wherever possible. Four different types of stage recorders are in use and their specifications are given. The weak spring mechanism of the clocks of local stage recorded resulted in relatively more frequent repairs. The techniques of data processing used at this Research Station have been briefty mentioned. Correction for time error has been applied, whereas no correction for gage and chart expansion errors have been found necessary. The paper brings out clearly the accuracy standards necessary for computing the run-off data. The accuracy attempted during the data processing and reduction should be in proportion to the accuracy standards possible to measure run-off in the field.- 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.- Preliminary Analysis for Calibration of Five Small Watersheds
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Indian Forester, Vol 95, No 7 (1969), Pagination: 461-469Abstract
no abstract- Runoff Estimates Based on Rainfall-retention Relationship
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Indian Forester, Vol 96, No 2 (1970), Pagination: 127-134Abstract
no abstract- Accuracy of Rainfall Sampling in Forest Clearings
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Indian Forester, Vol 96, No 3 (1970), Pagination: 195-202Abstract
no abstract- 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.
- A Note on some Soil Moisture Changes under Permanent Vegetative Cover
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