Study of Discharge Variations with Increased Impermeable Cover – A Case Study of Vignan’s Institute of Information Technology, Visakhapatnam
- April 14, 2018
- Posted by: RSIS
- Category: Civil Engineering
International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue IV, April 2018 | ISSN 2321–2705
G.Venkata Rao, M.Leela Priyanka, K.Raghavendra, Md.Sirajuddin
Department of Civil Engineering VIIT, Duvvada, Visakhapatnam, India
Abstract: – The analysis of the change in the flood run-off phenomena due to urbanization of the drainage basin is an important problem in the actual flood control project. As with all aspects of the water cycle, the interaction between precipitation and surface runoff varies according to time and geography. In the present study the runoff is estimated with existing surface layers. The imperious surface area is 37325.362 m2 and the surface discharge is 14250.823 m3. The study is also focused on how much amount of discharge increases with increase of every 5% impermeable cover. The increased discharge with impermeable is 14% for 10-20% ,27% for 35-50% and 36% for 75-100%.The ground slopes of the VIIT Study area is prepared by using Arc GIS technique.
Key words: Impermeable cover, slope map, discharge, Rain fall and permeable cover
I. INTRODUCTION
Water in inevitable thing for life .Life can’t be imagined without water .The population of world is increasing day by day so is the consumption of water with .With the increase in population the occupancy of land is also increasing which results in destruction of trees and forest area .Rain is not happening in time due to pollution and other human needs .Thus the concept and practice of rainwater harvesting comes into play.
The lands covered by trees, plants, grass or through which water can percolate into soil are called previous (vegetative) lands. And the lands other than the vegetative are called impervious land (i.e. the water can’t percolate into it).
As rainfall occurs first the water percolates down into the soil due to its permeability nature but with increase in duration and intensity of rainfall the percolation stops and rainwater flows over the surface as flood which causes erosion of soil .But as the percolation doesn’t happen in impervious layer this rainwater flows on previous layer which increase the flow of water on the previous layer .The more the increment of impervious layer the more will the runoff volume
