Reason-A Technical Journal (Formerly Reason-A Technical Magazine)

Subhasish Das ¹, Biswajit Majumder ¹, Arijit Chakraborty ¹, Bivas Mandal ¹, Pankaj Kr. Roy ¹, Asis Mazumdar ¹

Affiliations
1 Law and Management, Jadavpur University, Kolkata, West Bengal, IN

Abstract

Since the British period the Damodar River has been the main source of water supply in Raniganj, Asansol and Durgapur area of West Bengal State in India. Afterwards since nineties, the drinking water demand was increasing rapidly with the population rise. There has been a considerable scarcity in water supply especially in summer months. Recently, to augment the water supply situation, considering future demand and population rise, a hydro-geological study has been carried out during dry period at different locations on the river bed. The observation were undertaken in and around the existing pumping area on Damodar river located in the southern part of Raniganj. This research is aimed at assessing the yield test at exploratory bored wells to find out the minimum quantity of water available to design radial collector wells at three different locations with respect to their drawdown, transmissibility and storativity. Secondly, a field method for the mechanical analysis of bore well log material of the study area was attained to determine the material size and the required artificial gravel packing. On the basis of the field study and investigations, data collection, collasion and analysis, this paper has been prepared highlighting the characteristics of the aquifer, the location of the intake wells and yield of the bed.

Keywords

Damodar River, Aquifer, Bore Well, Yield Test, Drawdown, Transmissibility, Storativity, Sieve Analysis.

Full Text

   

Subhasish Das ¹, Pankaj Kumar Roy ¹, Asis Mazumdar ¹

Affiliations
1 School of Water Resources Engineering, Jadavpur University, Kolkata, West Bengal, IN

Abstract

Management measure for Irrigation water by tidal back-water influx is an important issue for the sustainable living of rural communities in the areas where the rainfall is insufficient for rabi crop cultivation. Tidal back-water influx is one of the sources of irrigation water in the lower gangetic planes of West Bengal, India. Based on that concept, a plan is provided for the Magrahat basin of South 24 Parganas district in West Bengal for the augmentation of irrigation facilities through excess amount of tidal back-water entry during the post-monsoon period when the salinity of water is considerably low. In the present study, twenty major canals or khals of Magarahat basin are considered. Volume of available tidal water for irrigation of rabi crops was determined from the gauge data of tidal rivers. Here an attempt has been made to delineate not only the enhancement of the economic return of the people of the Magrahat basin but also to create provision for multi-cropping (rabi crops) pattern of agriculture/horticulture facilities during the dry season for sustaining of their livelihood. Also the tidal backwater surface profiles have been suggested for all the major canals of Magrahat basin using standard step method of gradually varied flow.

Keywords

Water Availability, Tidal Back-Water Influx, Gradually Varied Flow, Water Requirement of Crop, Water Distribution Management.

Full Text

   

Subhasish Das ¹, Subhasish Das ²

Affiliations
1 School of Water Resources Engineering, Jadavpur University, Kolkata and Assistant Engineer, Kolkata Municipal Corporation, IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata, IN

Abstract

Energy plays a key role in all organizations, particularly those that are energy intensive. A comprehensive study to establish and investigate, energy balances for a specific plant unit has been conducted. In this study electrical energy assessment of a water treatment plant has been successfully completed. Jai Hind Jal Prakalpa water treatment plant located at Dhapa, Kolkata in India was selected for this study. From the energy point of view there is a financial loss in the monthly electricity bill of the plant and this may be rectified if suitable steps are taken. It is observed that by proper utilization of electricity, approximately 11.5% of electricity charges may be saved which amount approximately rupees four lakh per month.

Keywords

Water Treatment Plant, Energy Consumption, Energy Conservation.

Full Text

   

Souvik Chakraborty ¹, Subhasish Das ²

Affiliations
1 School of Water Resources Engineering, Jadavpur University and Department of Civil Engineering, Dr. Sudhir Chandra Sur Degree Engineering College, Kolkata, West Bengal, India., IN
2 School of Water Resources Engineering, Jadavpur University, Kolkata, West Bengal, IN

Abstract

Contai, a district of Purba Medinipur, has 79 natural reservoirs of minimum 0.01 hectare capacity. This water is utilised for irrigation and industrial purpose. The population of Contaihas been increased around 19% in last census decade. The decadal growth of population density in Contai is high compared to West Bengal. It had been also found that the perimeter and area of the water surface of these reservoirs were reducing gradually in last decade. Now with increasing population - irrigation and industrialisation has been taken place in Contai manifold. So withdrawal of water from the 79 existing reservoirs of Contai has been taken places in indiscriminate ways. But the recharge of reservoirs is very low since amount of rainfall in whole Purba Medinipur is quite less. In most of the season in 2019 here rainfall is less than 100 mm. From the present study it has been observed that annually the perimeter and surface area of such reservoirs are decreasing around 2.5% and 1.1% respectively. So abstraction is more than recharge of reservoirs. It's a little worried situation for Contai. If such an indiscriminate usage of water from reservoir for increasing irrigation and industrialisation has been taken place then reservoirs will become dry. Since rivers and canals in Purba Medinipur are almost saline prone so no alternative way of getting water for irrigation and industrialisation will be available. So it's high time to conserve the reservoirs of Contai. If irrigation and industrialisation are taking place by the withdrawal of groundwater then groundwater level will be diminished fast. According to Gyben Herzberg principle, for a half metre decline in groundwater level seawater encroaches into the mainland by 20 metres. So if water harvesting can be adapted to store water in reservoirs to supply water for irrigation and industrialisation then that can be bene!tted. The usage of water for various units from these reservoirs can also be limited.

Keywords

Reservoir, Perimeter, Area, Irrigation, Population, Industrialization.

Full Text