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40 0 CHATLEY ON SILT. [Selected (Paper No. 4380.) `` Silt." By HERBERT CHATLEY,D.Sc., Assoc. M. Inst. C.E. AT theend of 1914 the Engineer-in-Chief of theHuangpu Conservancy Board, Captain A. V. H. von Heidenstam, M. Inst. C.E., initiated a continuous silt survey, in connection with an extensive organization for hydrometric observations all kindsin the Huangpu of river, the lowest 20 miles of which forms the harbour of the great port of Shanghai...

Synopsis

The Paper describes a method of assessing the quantity of silt and debris discharged by streams and by the run-off from catchment-areas, with the consequent loss in storage-capacity of the reservoirs.

This method is intended to be used when the original contoured plans of the valley are not available and when the reservoirs cannot be placed out of commission for surveying.

278 OTHER SELECTED PAPERS. No. 1,646.-" On Keeping Irrigation CanalsClear of Silt." By ROBERT BURTON BUCKLEY, Assoc. M. Inst. C.E. THERE four methods by which it is possible to exclude more are than a desirable proportion of silt from enteringanirrigation system: (1.) Byworks in the river, whichwill clear the water before it enters the canal. (2.) By SO constructing the head sluice of the canal that only water bearing the desired proportion of silt is admitted...

7316 SYNOPSIS Silt movement in the Humber Estuary D. R. NORMAN, BSct The development of the recording siltmeter by the British Transport Docks Board Research Stationhas enabled continuous data to be obtainedover several years from which the relationship between the concentration of silt in suspension and other hydraulic variables, such as tidal range, freshwater discharge and water temperature, have been studied. This Paper discusses some findings from the data obtained on the Humber Estuary and also the of results field data taken seaward of the mouth of theestuary. 2. Some of the variations in the relationship between the silt in suspension and thetidal range are shown graphically and arediscussed with respect to the effect of other hydraulic variables...

264 DISCUSSION ON A THEORY OF SILT AND SCOUR. [Minutes of Discussion. The President. Ward. The PRESIDENT,moving thevote of thankstothe Author, in remarked that the application of the Author's theory of silt and scour was mainly concerned with canals. Mr. Kennedy, on whose work the Author's Paper was based, had been an intimate friend of the President's in India many years ago. Mr. Kennedy's work in connection with the theory of silt and scour in canals had been of great service and advantage to the Government of India ; it really had resulted in the canals of India being now so constructed that, generally speaking, there was no scour and no silt...

Proceedings.] GRIFFITH ON A THEORY OF SILT AND SCOUR. 243 25 January, 1927. FREDERICK PALMER, C.I.E., President, in the Chair. Thefollowing Paper was presented for discussion, and, on of The Institution motion of the President, thanks the accorded to the Author. (Paper No. 4545.) " the were A Theory of Silt and Scour." By WILLIAMMAURICEGRIFFITH, Assoc. M. Inst. C.E. THE silt-transporting power of a stream varies with the difference between the velocities of filaments of the current a t unit distance apart in averticalplane...

7273 DISCUSSION An experimental study of silt scouring T. J. PEIRCE, R. T. JARMAN & C. M. de TURVILLE Mr Jarman We decided to study silt scouring because power station cooling water may drawn be into the intake through an open channel or through a tunnel; a channel is cheapert o build but may suffer from siltation and so may need dredging, which can be very costly. Clearly, a better understanding of the siltation process could lead to significant savings in the cost of future stations...

280 The Author, DISCUSSION ON A THEORY OF SILT AKD SCOUR. [Minutes of tests of the theory which he had given. I n all three cases the calculations were based on a previously observed mean depth of the oldsection,fromwhich the maximumdepthunderthe tightenedsection had been calculated by means of equations (4)and (9). Equation (9) was only advanced tcnt>atively, and in applyingi t Colonel Anderson had presumably assumed a value for K . Further, the mean scour of the old section was probably based on a higher flood than had occurred after the remodelling, because figures for the great flood of 1924 werenot given...

GRIFFITH : FURTHER NOTES ON SILT TRANSPORTATION. 67 Paper No. 5538. Further Notes on Silt Transportation."? By WILLIAM MAURICE GRIFFITH, A.M.I.C.E. (Ordered by the Council to be published with written discussion.)? TABLE OF CONTENTS. Notation . . . . . . . Previously developed formulae Synopsis of existing theories . Later reasoning ..... New conclusions . . . . . Appendix : Bibliography . . ..... .... .... .... .... .... .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE . . . . . 67 68 69 69 72 81 NOTATION. B denotes width of cross-section a t surface, in feet. C ,, general silt factor...

JOURNAL OF THEINSTITUTION OF CIVIL ENGINEERS No. 2. 1945-46 DECEMBER 1945 Paper No. 5492 " Particle-size i Silts and Sands."* n By RUDOLPH GLOSSOP, B.Sc., and ALECWESTLEY SKEMPTON, M.Sc., Assoc. M. Imt. C.E. TABLE OF CONTENTS. Introduction Mechanical analysis . . . . . . . . . . . . . . . Distinction between gravel and sand fractions . . . . . . Distinction between silt and clay fractions . . . . . . . Distinction between silt and sand fractions . . . . . . . Distinction between the sand fractions . . . . . . . . Conclusions Acknowledgements . . . . . . . . . . . . . . Appendix : Bibliography . . . . . . . . . . . . .... .... .... .... .... .................... .... .... INTRODUCTION...