Browsing by Author "Mishra, Sushree"

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    Design and management of urban storm water drainage system in coastal cities
    (AIKTC, 2017-04) Mishra, Sushree; Sardar, Abusajid (14DCES50); Mirza, Nafeesa (14DCES66); Ansari, Fahad (14DCES51); Siddique, Adnan (13CES57)
    Mumbai is experiencing wide variation in spatial-temporal distribution of rainfall and subsequent water scarcity and flooding conditions. Hence, rainfall analysis was carried out in Mumbai metropolitan region using the daily rainfall data of 20 years at Colaba and Santacruz stations. It was observed that aberrant variation in rainfall event in monsoon months causes heavy rainfall resulting in water logging and subsequent flooding conditions. An analysis of monthly one day maximum rainfall, yearly one day maximum rainfall and seasonal one day maximum rainfall of colaba and Santacruz raingauge stations showed that the study area was facing huge variation in rainfall pattern which often causes flooding conditions. The maximum rainfall recorded was 944.2 mm/day on 26thjuly 2005 which caused flooding in Mumbai city which caused in loss of human life and property. By considering 944.2 mm/day, of rainfall return period was calculated using Weibull’s formula it is observed that the highest return period is 20 years and the lowest return period is 1 year. So we have taken this return periods into account and generated IDF curves for 2,3,5,.10,15,20,30,50,70,100 years. Intensity duration frequency (IDF) curves were generated by using Gumbel’s Equation. The IDF curves at a duration of 24 hours predicted the intensity of rainfall for Colaba raingauge station as 346.944 mm/day and for santacruz raingauge station as 821.64 mm/day, for 100 year return period . This obtained rainfall was then used to calculate runoff for Mumbai city by using rational formula and calculated as 2072.5 m3/sec.
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    Drought vulnerability assessment in Jalna using drought indices
    (AIKTC, 2018-05) Mishra, Sushree; Chuhan, Mohammed Shuaib(14CE13); Ansari, Mohd. Aadil(14CE08); Jamadar, Mohd. Aatif(14CE18); Shaikh, Shadab(15DCE72)
    Drought is a temporary and recurring hydro-meteorological event, which originates from the lack of precipitation, high temperature, and high evaporation over extended period of time. It is a normal part of any climate and, perhaps the most complex natural hazard, because it develops slowly, it is difficult to detect and has many facets in any single region. Drought preparedness and mitigation depends upon timely information on drought onset, development in time and spatial extent. This information may be obtained through continuous drought monitoring, which is normally performed using drought indices. This project work describes drought assessment, using two different drought indices, SPI (Standardized Precipitation Index) and RAI (Rainfall Anomaly Index). The Marathwada region of Maharashtra was chosen as the study area and this region is characterized as a ‘frequently drought prone area’, where drought can be expected every 6 to 10 years. A comparison of RAI and SPI values were done for determination of drought severity and temporal extension of drought for planning of mitigation measures for farmers. Using the SPI and RAI as indicators of drought severity from 1901-2002, the characteristics of drought were examined. The monthly rainfall data for the period (2012-2016) was also analyzed and the severity of drought was evaluated as a check with the historical data. The maximum annual SPI was -2.61 in the year 1920, similarly the RAI values also showed the same results which was -4.748 indicating the extreme drought conditions in the study area. The monthly SPI values were also compared with RAI+ and RAI- values for the period under observation. It was observed that the RAI- is highly correlated with SPI for determining the characteristics of droughts in the study area. The overall outcome of this study demonstrates that extreme and severe droughts were experienced in the years 1920, 1972 and 1911, 1912, 1918, 2000, 2001 across the study area leading to unfavourable results on agricultural practices and water resources in the area.
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    Warka water: Innovative water harvesting method from thin air
    (AIKTC, 2018-05) Mishra, Sushree
    Semi-arid region is a region where the rainfall varies from 250 mm to 650 mm per year. Because of less rainfall , high evapo-transpiration , surface and ground water availability is very less in these regions. It leads to water scarcity and drought conditions. Conventional water harvesting structures are not suitable in these regions. Hence there is need to go for alternative solution such as water harvesting from thin air. The aim of this research work is to find alternative method of water harvesting from thin air to overcome drinking water problems in semi-arid regions. The objective of this study is two fold , firstly to carryout comparative analysis of different water harvesting structures from thin air and secondly to carryout feasibility and cost analysis of Warka Water Tower in semi-arid region. In this research work , different water harvesting structures from thin air were studied and Warka Water Tower was found to be most economical and convenient because of its low initial cost , zero energy requirement and less maintenance cost and easy availability of construction material. The rate of discharge of a Warka Water Tower is 100 lit per day , however its efficiency can be increased with suitable conditions. Hence Warka water tower can be effectively used for drinking water purpose in semi-arid regions. In this study, feasibility analysis of Warka Water Tower was carried out and it was found that the structure is suitable at temperature 40 degree Celsius and relative humidity 50 -70 %. Cost analysis shows that the cost of a single Warka tower is 33,000 rupees.