Informatics Publishing Limited

S. S. Dalal , R. C. Trigotra

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Cultivation of poplars has a well defined scope in lans outside State forests in Haryana and similar other intensively cultivated States lacking natural forests. Poplar plantations are a step in the rlght direction to meet the acute shortage of wood. Roads, canals and farm lands are important sites outside traditional forests where poplar cultivation can be taken up. Roads do not provide ideal sites because of cattle damage and lack of proper irrigation. Canal sites are well suited for introdultion of Populus deltoides G-3. The planting spot along canals should follow the seepage line of the embankment and therefore, the sites have to be selected with reference to the depth of seepage lines. Farm lands provide ideal sites for this species for raising plantations in rows along field boundaries and also in integration with agriultural crops. Sugar-cane is the ideal companion crop for growth of Populus deltoides G-3. Loam and silt loam are best suited for optimum growth. Even mild alkali and satinity reduce. Survival perrentage and growth. Intensive soil management h needed for optimum production. Hand watering is a wasteful and Ideffective practice. A farming system using poplars and crops appears to be well suited in intensively cultivated areas. Planned research is required to promote development of poplars. Clones for water logged and alkali soils need to be developed. Proper machinery and equipment are required to drill deep holes. P. deltoides G-3 is very exacting species and great care is needed to select poplar site. Spacing is of not much serious consideration for row planting but needs careful consideration when poplars are grows with crops in block plantations.

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Wasi Ullah , S. S. Dalal

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S. S. Dalal , N. Patnaik , Bakhshish Singh

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Wasi Ullah , S. S. Dalal

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S. S. Dalal , N. Patnaik

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S. S. Dalal , N. Patnaik , Dakhshish Singh

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Performance of 8 grasses was studied to find their suitability for waterways. Of these, Panicum repens gave best results as it maintained wel1 with a thick sod and high forage yield. Brachiaria mutica and Cynodon plectostachyum are considered next best in their performance. Cynodon dactylon provided excellent protection but its forage yield was comparatively low. Paspalum notatum was slow to establish in the first year and produced lower forage yield although it formed thick matting in subsequent years providing Good protection to waterway. The method of establishing a grassed waterway, as discussed , was used successfully to stabilise waterway in Dhulkot Demonstration Project with Panictum repens and Cyndon plectostachyum.

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S. K. Gupta , S. S. Dalal

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The paper describes the use of gabion structures for erosion control based on the experience gained at the Soil Conservation Research Demonstration and Training Centre, Dehra Dun. These structures have been used in land-slip and slide control, torrent correction and gully control works. They are simple in construction, flexible, self draining and are made of construction materials locally available. These structures are cheaper than conventional structures and yet quite eftective. The technique of gabion construction has been explained with illustrations. The specificationa for various structures have been given for guidance.

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S. S. Dalal , Wasi Ullah

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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.

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Wasi Ullah , S. S. Dalal

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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.

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S. K. Gupta , S. S. Dalal , Ram Babu

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Rainfall is the most important component of the hydrological cycle. Rainfall data is needed by all agencies dealing with the use and management of natural resources. The total rainfall and distribution, intensity, duration and frequency are often needed for design of engineering structures, analysis of erosion and flood problems. The annual and seasonal data are usually represented by bar diagrams. These do not give much useful information. Probability and frequency analysis of rainfall data will be more useful. The paper describes the method of frequency analysis of annual, seasonal, monthly and daily rainfall data and also for duration less than 24 hour. Similar analysis for other localities as recommended for preparing an isopluvial map of India for various duration and recurrence intervals.

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Wast Ullah , S. S. Dalal , H. N. Mathur

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R. V. Tamhane , Wasi Ullah , S. S. Dalal

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S. S. Dalal ¹

Affiliations
1 Mangalwarpeth, Dharwad, IN

Abstract

Let f(z₁,z₂) = Σ a_mnz^m₁zⁿ₂

be a function of two complex variables z₁ and z₂, where the coefficients a_mn are complex numbers. The series (1.1) represents an integral function of two variables z₁, z₂, if it converges absolutely for all values of |z₁| < ∞ and |z₂| < #8734;.

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