India

In this report, a mathematical model capable of computing the flow depth and discharge in each of the branched flows is developed using gradually varied flow equations. This model can handle three flow situations viz. temporary flow diversion, a cut-off channel and a single river island. Computational capability of the model is increased to handle irregular cross sections of a river.

In the present report a mathematical model has been developed for the study of stream aquifer interaction in multilayered system viz. a three-aquifer system, in which aquifers are separated by aquitards, considering varying stream-stage and vertical flow through aquitards. The model enables the computation of rates of recharge to the upper aquifer and exchanges of flow among aquifers along with the spatial and temporal distributions of piezometric heads in the aquifers.

Content Courtesy: Devex

• Water Experts - India

DAT

Location: India
Last Date: 15 July 2010

The present study is in continuance with the earlier investigations made regarding the seepage from a surface water body in a multilayered aquifer system, wherein the influence of varying dimensions of a fractured-zone in a aquitard on the seepage from a source had been investigated. The objective is to examine the influence of a fractured-zone in a confining aquitard on the seepage from a surface water body. The issues covered include the influence of –

• The location with respect to the source of a fracture in the aquitard
• The position of the fractured aquitard at various depths in the aquifer system on the seepage from the source

The report attempts to do a trace analysis of pesticides using gas chromatography technique. Pesticides are bio-accumulative and relatively stable, as well as toxic or carcinogenic, and therefore, require close monitoring. The identification and quantification of pesticides in different water bodies is a very important part of water analysis. The gas chromatography technique is considered appropriate, as most of the pesticides are volatile at the working temperature of gas chromatography. However, a pre-derivatization of a very few pesticides may be required prior to the analysis.

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• Technical specialists- Anticipated USAID-funded Water Analysis, Innovations and Systems Program (WAISP)

Chemonics International Inc

The report gives an account of a feasibility study of rainwater harvesting in semi-arid regions. A review of water harvesting systems is followed by a section wherein numerical solutions for surface flow equations are explained. 

In this study, a two-dimensional overland flow model has been developed considering random roughness coefficients and irregular land surface for the analysis of surface flow component. The one-dimensional Richards equation for subsurface flow component has been used for calculating the infiltration from the pervious area.

The report presents the status of risk based hydrologic designs that have been reported in literature and based on these, identifies a computational procedure for developing hydrologic design bases for dams and spillways. Some illustrative examples are presented in order to demonstrate the impact of risk based analysis on current design practices.

The report deals with the hydrological aspects of watershed development and describes watershed components and watershed models. It gives an account of the various watershed models in details including data requirement, input, output, various physical processes and governing equation. The suitability of a particular model to Indian condition is also highlighted in the report.