According to climate change studies done by BITS Pilani hyderabad in the ghmc area, more than half of the buildings situated inside the ghmc limits are at a high risk of being negatively impacted in the event of floods. The study also forecasted 1,740.62 mm of exceptionally heavy rainfall, or nearly eight times as much rain as the city saw in august 2020 (241.5 mm), to fall in the year 2040. This has been related to both the dramatic changes in the climate and the expansion of land use.
Dr. madhuri Rampalli, who carried out this study under the supervision of Professors K. Srinivasa Raju and A. Vasan of the Department of Civil Engineering, discovered that buildings and roads have highly susceptible areas of 57.59 percent and 22.76 Sq km, and the inundated area is 442.53 km2. The flood depth ranged from 0.1 to 8 m. She advised that as mitigating measures, buildings in the high risk category should be watertightened, and water should be diverted to resource filtration basins or wells for groundwater recharge. According to the report, waterproofing all structures in the high-risk category will cost Rs. 4,964.60 cr.
According to climate change characteristics based on the General Circulation Model (GCM, GFDL-CM3) and Representative Concentration Pathways (RCP 2.6), the FSBR is a combined index for evaluating flood susceptibility and building risk simultaneously to evaluate the impact of the flood. The Hussain Sagar and musi river areas, which were separated into 16 zones for the study, were found to be the most susceptible to floods. Since they are located in low-lying areas and are close to the musi river, Kothapet, Mansoorabad, Falaknuma, Kacheguda, and Begum Bazar have significant percentages of flooding areas.
The survey indicated that Kothapet and Mansoorabad zones had the second-highest concentration of High Risk buildings, behind Falaknuma, Kacheguda, and Begum Bazar zones. Due to their relative higher elevations, the Gachibowli, Vanasthalipuram, and Kapra zones have a higher concentration of Low Risk buildings. Due to its high elevation, Chandanagar has the lowest proportion of flooding area. Flood depths range from 0.2 to 6.8 metres in Vidyanagar and Ramnagar and from 0.3 to 8 metres in Kukatpally. According to the study, this is a result of the fast urbanisation of these areas.
According to Prof. Dr. D Vijay kishore of the jawaharlal nehru Architecture and Fine Arts University, the government should collaborate with all stakeholders to develop plans that put an emphasis on low-lying areas, an efficient underground drainage system, and the smooth flow of surdata-face water in light of the city's rapid growth and the formation of a new city that data-borders the ORR to the west. We must monitor events in Delhi, Mumbai, and other locations in order to plan for our city appropriately, he continued.
Zones
1 Kothapet, Mansoorabad
2 Hayathnagar
3 Vanasthalipuram
4 Saroor Nagar, Kanchanbagh
5 Falaknuma, Kacheguda and Begum Bazar
6 Attapur, Goshamahal
7 Rajendra Nagar
8 Mehdipatnam, Jubilee Hills, Panjagutta
9 Gachibowli
10 Serilingampally, BHEL
11 Chandanagar
12 Kukatpally
13 Vidyanagar, Ramnagar
14 Kapra
15 Tarnaka, Nacharam
16 Cherlapally
Waterproofing for reducing FSBR:
Waterproofing is the mechanism to restrain the entry of water into the walls and rooftops of a building. It will also increase the life cycle of buildings considerably and be employed to reduce the FSBR in terms of the total affected area and the number of exposed buildings