HYDROLOGICAL ASPECTS OF JUNE 28, 2017 FLOOD

Abstract

The design of efficient storm water drains is a matter of great concern for urban planners and engineers. Efficient drainage is required for disposal of extreme flows as well as normal flows. The present study focuses to provide solution for urban flood issues in a small urban catchment. An unusual storm event, which occurred on June 28, 2017 at Indian Institute of Technology Roorkee campus, and the entire Roorkee area, caused heavy damages to the property in the campus and a very large area in the campus and the city got flooded. This storm has been critically analyzed in terms of its severity using frequency analysis approach. Using spatial data sets available in public domain and surveyed map, the capacity of existing drainage system has been assessed using rational formula and Storm Water Management Model. For this purpose the following steps were developed and the work was carried out. a. Demarcation of the campus boundary on the map and demarcating the existing drains on the same map. b. Demarcation of all the external drains having inlet inside the campus and computing their catchment area at various inlet points. c. Development of IDF curves for IIT Roorkee. d. Computation of time of concentration at each catchment. e. Computation of peak discharges at various points of the stormwater drain. f. Adequacy of the existing drains of the campus. After the assessment of the efficiency of existing stormwater drainage system of IIT Roorkee campus, recommendations are made so that the runoff generated due to high intensity rainfall could be controlled in future.