Climate and Weather

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December 12, 2022 Study looks at behavioral biases in crop insurance adoption
Adoption rate of crop insurance low in India despite government efforts (Image: PxHere, CC0 Public Domain)
September 13, 2022 Heavy rains and floods have battered Bengaluru yet again. Uncontrolled and unregulated development and concretisation of the city that pays no heed to the ecology and hydrology of the region needs to stop!
Urban flooding in Bangalore (Image Source: Thejas via Wikimedia Commons)
August 11, 2022 This could lead to water quality crisis reinforcing the need for basin-specific management strategies
Around the world, more than a fifth of nitrogen released by human activity ends up in aquatic ecosystems (Image: Wikimedia Commons)
May 14, 2022 Climate change is real. What are its implications for India? This book presents a first of its kind national forecast on the impact of global warming on climate in India.
Climate change is real. What does it mean for India? (Image Source: Robert Hensley/Wikimedia Commons)
March 29, 2022 The intensity and duration of heat waves is predicted to increase in India and human induced anthropogenic changes are to blame.
A man sits under the scorching heat of the sun in front of Amer fort in Jaipur (Picture courtesy: Prabhu B Doss, Flickr Commons: CC-By-NC-ND-2.0)
Study of recharge to groundwater due to monsoon rains using Tritium tagging in parts of Narsinghpur – A research report by National Institute of Hydrology
The study attempts to estimate the recharge to groundwater due to rainfall and irrigation using tritium tagging techniques in parts of the Narmada catchment in Madhya Pradesh. Posted on 28 Jun, 2010 04:48 PM

The study attempts to estimate the recharge to groundwater due to rainfall and irrigation using tritium tagging techniques in parts of Narsinghpur district under the Narmada catchment in Madhya Pradesh. The estimation of recharge to groundwater is crucial to better water resources management, particularly in arid and semi-arid regions.

Field testing of weighing raingauge - A research report by National Institute of Hydrology
The study by the NIH, attempts to carry out field testing of the weighing raingauge for measurement of rainfall, which is at the core of all hydrological measurements. Posted on 27 Jun, 2010 10:48 PM

The study attempts to carry out field testing of the weighing raingauge for measurement of rainfall, which is at the core of all hydrological measurements. The tipping bucket rain gauges are generally used for automated recording of rainfall data. It has been reported that the tipping bucket mechanism of such raingauges frequently malfunctions and gives erroneous data, especially during high intensity rainstorms.

Single column hydrologic simulation using SHE models - A research report by National Institute of Hydrology
The article is about the European Hydrological System which is physically based distributed model and helps in understanding the importance of evaporation data and soil parameters. Posted on 27 Jun, 2010 10:31 PM

The Systems Hydrologique European – European Hydrological System (SHE) is a physically based distributed model and it provides a useful setup for understanding the importance of evaporation data and soil parameters. 

In this study, single column hydrologic simulations have been carried out for examining the sensitivity of this model to pan evaporation data of the various stations as well as the increase in conductivity of the unsaturated zone. Furthermore, the reduction in the value of exponent appearing in the Averjanov’s formula and reduction in the values of moisture content at wilting point and residual water content has been studied for a single grid of 2 km X 2 km size of the Narmada river.

Catchment modeling in a Geographical Information Systems environment - A research report by National Institute of Hydrology
The report develops rainfall-runoff modeling for simulating and forecasting the flow from a catchment, and in determining the inflow series for the ungauged catchments. Posted on 27 Jun, 2010 08:32 AM

The report develops rainfall-runoff modeling for simulating and forecasting the flow from a catchment, and in determining the inflow series for the ungauged catchments on the basis of records of gauged catchments.

Because of the scarcity of data, mostly lumped models have been used to model the rainfall-runoff process in a catchment. However distributed models are more accurate and need to be adopted for modeling the complex processes at the scale of basins.

Automated mapping of snow cover using IRS-IC data - A research report by National Institute of Hydrology
The study presents automated mapping of snow cover using a new spectral channel of Indian Remote Sensing (IRS-IC) data for the Spiti sub-basin of the Satluj river basin. Posted on 27 Jun, 2010 07:56 AM

The study presents automated mapping of snow cover using a new spectral channel of Indian Remote Sensing (IRS-IC) data for the Spiti sub-basin of the Satluj river basin. Snow is an important phase of the hydrological cycle and the estimation of snowmelt runoff in the Himalayan rivers, either seasonal or daily, is of immense use in proper management and use of water resources in the basins.

Modeling of flow in the canal due to breach of bank - A research report by National Institute of Hydrology
The study develops the wavelet element method for hydrological application purposes in general and modeling of flow in a canal due to breach of bank because of rainfall and cyclones. Posted on 27 Jun, 2010 12:15 AM

The study develops the wavelet element method for hydrological application purposes in general and modeling of flow in a canal due to breach of bank in particular. Due to high seasonal variability of rainfall and cyclones in coastal India, flood discharges cause frequent breaching of canals.

Canal breach modeling is of great significance in open channel hydraulics. The study of breach of a canal is a relatively new one as compared to dam breach, which is a well researched field. The analysis of the problem is complicated due to dynamics of flow within the canal. The limitations of the above model due to the one-dimensional model analysis of the problem is hoped to be overcome in two or three dimensional analysis.

Determination of snow and ice melt factors in the Himalayan region through field investigations – A research report by National Institute of Hydrology
The study computes degree-day factor for snow and ice over the Dokriani glacier (4000 m altitude) in Garhwal Himalayas. Posted on 26 Jun, 2010 11:16 PM

The study computes degree-day factor for snow and ice over the Dokriani glacier (4000 m altitude) in Garhwal Himalayas. The effect of natural dusting on degree-day factor is also examined. Information on the degree-day factor for snow and ice is required for the estimation of snow and ice melt runoff from a glacierized basin.

Long term hydrologic simulation using SCS-CN method - A research report by National Institute of Hydrology
The report uses the Soil Conservation Services (SCS, 1956), Curve Number (SCS-CN) method, for simulating daily rainfall-runoff data of three catchments, viz., Ramganga, Hemavathi and Sabarmati. Posted on 26 Jun, 2010 11:40 AM

The report uses the Soil Conservation Services (SCS, 1956), Curve Number (SCS-CN) method, a widely used event based rainfall-runoff method for simulating daily rainfall-runoff data of three catchments, viz., Ramganga and Hemavathi catchments of the sub-humid regions and Sabarmati catchment of the arid region of India.

In the model formulation, the daily variation of parameter, potential maximum retention is governed by the known antecedent moisture condition. Hydrologic simulation studies provide a useful and important input to water resources planning and watershed management practices.

Methodology for water availability computations under different availability scenarios - A research report by National Institute of Hydrology
The report discusses the water availability computations under different data availability scenarios Posted on 25 Jun, 2010 10:56 PM

The report discusses the water availability computations under different data availability scenarios. Water availability generally refers to the volume of water available from the basin or stream at a particular point over a specified period of time. Volumetric relationship is reflected between rainfall and runoff. Many factors like climatic and basin characteristics affect the water availability of a basin. Time and space distribution of rainfall, its intensity and duration, surface vegetation, soil moisture, soil characteristics, topography and drainage network are some of the important factors.

Application of Geomorphological Instantaneous Unit Hydrograph and Geographical Information Systems based approach for flood estimation – A research report by National Institute of Hydrology
The study attempts to apply Geomorphological Instantaneous Unit Hydrograph (GIUH) and Geographical Information Systems (GIS) based approach for flood estimation Posted on 25 Jun, 2010 10:33 PM

The study attempts to apply Geomorphological Instantaneous Unit Hydrograph (GIUH) and Geographical Information Systems (GIS) based approach for flood estimation. The design storm data of four catchments along with morphological characteristics have been considered. The geomorphological parameters and time area diagrams for each of the dam catchments were generated using the GIS package, Integrated Land and Water Information Systems (ILWIS).

The geomorphological parameters together with the time-area diagram forms an important input for the GIUH based Clark model. This model has been applied for deriving the instantaneous unit hydrograph and thereby to estimate the design flood in four dam catchments located in Luni and Chambal basins in Rajasthan viz. Jawai, Sei, Gamabhiri and Alnia. A review of the previous studies carried out using GIUH approach has been presented. Furthermore, a review of studies carried out using GIS techniques is also provided.

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