IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 3 Ver. I (May. - Jun. 2015), PP 11-14 www.iosrjournals.org DOI: 10.9790/1684-12311114 www.iosrjournals.org 11 | Page Evaluation of Siltation and Analysis of Water Samples for Koradi Lake Mr. Rahul V. Vyawahare 1 , Mr. M.P. Bhorkar 2 , Dr. V.P. Thergaonkar 3 1 Student of M. Tech (Environmental Engineering), G.H.R.C.E, Nagpur, India 2 Assistant Professor, Department of Civil Engineering, G.H.R.C.E, Nagpur, India ( 3 EX- NEERI Scientist & Director, Enviro Techno Consults, Nagpur, India. ______________________________________________________________________________________ Abstract : Koradi is one of the thermal power stations in Maharashtra. It receives water from a lake located nearby to KTPS. This lake is surrounded by large number of small scale industries, Mahalaxmi Devi temple and slums. KTPS receives water from this lake for its daily use and for the production of electricity from coal. The wastewater from the nearby colonies is directly discarded to the lake. Hence water analysis of the lake is done. The quality of the water is analyzed and compared with the CPCB and CPHEEO standard desirable limits. The physical characteristics such as odour, colour, temperature, turbidity and chemical characteristics such as pH, total alkalinity, total hardness, total dissolved solids, dissolved oxygen, percentage saturation, biological oxygen demand, chemical oxygen demand, iron, sulphate, phosphate etc. is determined. The plankton analysis is also done to study the macrobial plants and animal species present in the lake. The depth measurement is done to know the present capacity of the lake/reservoir. The exact amount of silt deposition in the lake /reservoir is also calculated. Keywords - Koradi Lake, Koradi (Nagpur), physico-chemical water analysis, depth, silt deposition, surface area and capacity of lake. I. Introduction Koradi is known for thermal power station and Mahalaxmi Devi temple, which draws devotees to its doors throughout the year. Koradi is 17kms away from Nagpur City and nearest railway station is Nagpur. Its latitude is 21.25°N, 79.09°E. Koradi Thermal Power Plant is located at Koradi. This power plant is one of the four major power plants in Vidharbha. The plant operates seven units and has a total power generation of 1080MW. The plant approximately requires 16000 to 17000 tonnes of coal every day. The water for thermal power station presently comes from Totaladoh hydroelectric power station. Also Nagpur Municipal Corporation provides treated water from its sewerage treatment plant. Due to furthur expansion of 3X660 MW more water is required by the plant. Hence the major source of water is available in nearby area and is Koradi Lake. To supply water from reservoir to Koradi Thermal Power Plant supercritical flow is necessary. Hence water must be pollution free. So water analysis is necessary. No silt shall enter into the system. Reservoirs are losing their water quality due to addition of waste water and increase in typha type grass and are therefore seriously threatened in their performance. Without any mitigating measures the viability of many reservoirs in the worldwide is questionable, as the impacts and losses are not balanced by the profits. Reservoir sedimentation shortens the useful life of reservoirs. Approximately 1% of the storage volume of the world's reservoir is lost annually due to sediment deposition. [1],[4] The storage capacity of reservoirs decreases day by day due to accumulation of sediment. The total withdraw of water depends upon the capacity of the reservoir which is also determined. Evaluation of siltation of Koradi Lake is to be done which is again necessary for the withdrawal of water. [5] II. Methodology The samples were collected from two different points near to pump house of Koradi Lake. The water samples were collected in the BOD bottles and 1L Plastics bottles. The closed BOD bottle is dipped in the lake and then bottle was opened inside. Before collection of samples the bottles were washed by distilled water. A sample container must satisfy the following requirements. 1. It should easily be freed from contamination. 2. It should not change the relevant water characteristics on contact. 3. It should have adequate capacity for storing the samples. 4. It should be resistant to impact and to internal pressure which is increased by expansions of water or by release of dissolved gases at elevated temperature on storage. [2]