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Hydrological Design Aids (Surface Water)    Objective   HDA 3
HDA 3: Sedimentation Rate Estimation
Sedimentation has a significant impact on the structure like dam and reservoir. Sedimentation affects the estimation of economic life of reservoir of dam and reservoir and hence should be predicted with greater accuracy.
HDA 3 helps in determining the appropriate dead storage (mandatory assigned volume for sediment in reservoir/ New ZERO elevation) for the use for different time horizons as per BIS and CBIP (Central Board of Irrigation and Power) standards as well as fixation of revised dead storage level. In case of gauged catchment, observed sediment data will be used to establish this HDA while for ungauged catchment, the regional sediment curves (iso-erosion lines) are required to be prepared for 4 different regions in the country based on observed silt data for rivers/ reservoirs.
Tools identified in HDA 3
The HDA 3 comprises of seven tools which cover two legacies and five in-house developed software. A data storage software for local storage of various data viz. spatial, location, time series and relational will be provided.
Under HDA 3 following tools/ design aids will be developed for sediment rate estimation and its distribution in a proposed project.
  1. Development of software tools for covering procedures for assessing silt rates using observed silt data or reservoir resurvey data.
  2. Providing design aid in the form of regional sedimentation rates for the seven zones of India using the observed silt inflow data and the reservoir resurvey data.
  3. Developing regional models for sediment yield using the procedure proposed by Garde and Kothyari (1987), for seven identified regions within seven zones of India.
  4. Development of procedures and interfaces to use spatially distributed model MWSWAT for determination of sediment yield from various sub areas using spatial nature of the analysis.
  5. Trap efficiency of any reservoir is presently estimated using Brune Curve. The software tools will be developed to use these relations or the revised relations which are proposed to be developed using Indian sediment inflow and reservoir resurvey data.
  6. Sediment Distribution pattern in proposed reservoirs is at present estimated using Empirical Area reduction method. The software tools will be developed to use these procedures. Indian reservoir survey data will be utilized to develop relationships for predicting sediment distribution pattern in reservoirs.
  7. 1-D numerical models are used for assessing sediment transport and deposition in rivers and reservoirs. It is proposed to develop software interface for using HEC-RAS model in situations where necessary data is available.
The data required for the sedimentation studies will be the discharge and silt data observed at various gauging sites along with the physiographic details, geology, soil and land use in the catchment as also the reservoir resurvey data of the existing reservoirs in the area. Interfaces with HDA will be developed for various data storage software, data processing and data validation software which are being used such as HYMOS, SWDES, WISDOM and WRIS. The HDA is proposed to have Open Ml interface, which will facilitate interlinking with all Open Ml complaint software.
HDA 3: Sedimentation Rate Estimation