DESIGN OF SEDIMENT FLUSHING OUTLETS

1 INTRODUCTION Considerable amount of sediment discharge enters in a canal at the head works. This sediment discharge is carried safely as the slopes of the canal in the head reaches are large. Subsequently, for economy, the slopes of canal are reduced in the downstream reaches. This makes the sediment concentration far excess of its carrying capacity. This excess sediment has to be removed by suitable design of a sedimentation basin. Also, one of the requirements for successful function…     

DESIGN OF SEDIMENT TRANSPORTING CANAL SECTIONS

Design equations for minimum area or maximum velocity canal-sections for transport of bulk sediment carried by water have been obtained. Such canals are economically feasible in the terrain where large slopes are available. The design procedure is illustrated by a practical example.     

RESERVOIR CAPACITY DEPLETION ON ACCOUNT OF SEDIMENTATION

l 1NTRODUCTIONAs the sediment cAned by the river gets dePositOd in the reservoir, there is a pro gressive reduction in itscaPacity to hold water. For examPle the Zuni reservoir on river Zuni, a tributary of the little ColoradO atBlack rock, New Mexico, U.S.A., lost aboat 75% caPacity in just 20 years. Sindlary, just in l0 years theIchari reservoir on river Tons, a tribUtary of river Yamuna (Inda), reduced to about l5% of its originalcaPacity. Thus, at the planning stage, one must …     

STABLE CHANNEL OBJECTIVE FUNCTION

1 INTRODUCTIONA stable channel is a stream in equilibrium that is neither silting nor scouring over a period of time.Obviously, such a stream has developed a cross sectional area of flow through natural processes ofdeposition and scour. Gilbert (Chang 1988) in 1880 was perhaps the first to recognize the role ofndnilnization processes in arriving at an equilibrium cross-section of such a stream. Langbein (1964)gave an arbitrarily formed function of various knit powers obtained by dividing …     

SPATIAL AND TEMPORAL CHANGES IN THE BRAHMAPUTRA RIVER BED

1 INTRODUCTION Originating in the Kanglung Kang Glacier near Konggya Tso Lake (Lat. 30°30' N - long. 82°10'E) at an altitude of 4,877 m and 63 km southeast of the Manasarowar Lake in the Kailash Range of the Great Himalayas, the Brahmaputra River flows …     

Approximate Simple Invertible Equations for Consolidation Curves Under Triangular Excess Pore-water Pressures

Approximate but accurate, simple invertible equations for the consolidation curves under triangular excess pore-water pressures are developed. These approximations can be used to calculate the degree of consolidation corresponding to a specified time factor (explicit) or the time factor corresponding to a specified degree of consolidation (implicit). Explicit equations are also developed for estimating the consolidation coefficient and final settlement, from two settlement readings, using the proposed approximations.     

EQUATIONS FOR GRAIN SIZE DISTRIBUTION CURVE

The grain size distribution of particulate material is of particular interest in the field of sediment transport. The size distribution is described by various equations, however no equation is flexible enough to satisfy the grain size distribution data faithfully. Presented herein are the equations for unimodal and multimodal grain size distribution curves. A graphical method has been given to evaluate the parameters involved in these equations. The size distribution equation can be used to estimate many properties of sediment sample like number of sediment particles, surface area of the particles and hydraulic conductivity. It is hoped that the equations will find many applications in studying sedimentation processes.