Mapping for Lendi Dam

Amount

Considering Design Flood of Lendi Dam as per CWC guidelines based on data availability. It includes detailed reporting of physiography, topography, climatology, hydrology, geological formation of Lendi Dam catchment area (Upstream and Downstream). GIS based figures with necessary methods and models will be submitted separate chapter in final report. Estimate Inflow into Lendi Reservoir using historical available data.

To carry out detailed scenario analysis for 2-dimensional hydraulic simulation from releases of Lendi dam along with lateral inflow from river tributaries, nalas into main Lendi river for preventing flood inundation in the city. To study Dam Break Analysis (Tier-1) as per provisions to the extent modified and super-ceded in “the Guidelines for Developing Emergency Action plans for Dams (Feb 2016) Doc.No.CDSO-GUD-DS-01-v2.0): The analysis should contain a report and the results of model runs, including graphs and tables. The Report should summarize all data, should explain and comment the obtained output from software. The dam break study has to be carried out according to specification of following conditions and aspects: • Dam Failure with the reservoir level at normal storage elevation (FRL) and fair weather condition. • Dam Failure with bad weather, i.e. considering the inflow entering in the reservoir due to Probable Maximum Flood (PMF) and MWL, or Standard Project Flood (SPF)/ Design Flood and MWL. • Flood routing downstream of the overflow from the spillways and gates produced by PMF or Design Flood (without dam break scenario). • Other relevant conditions peculiar to the dam (like spillways discharge that is safe for the dam but may cause emergency conditions in the areas downstream). • Assessment of safe carrying capacity of the downstream channel and safe levels evaluation. Digital supports of land cover maps used, with a minimum grid resolution of 5.8 m.

Prepare flood inundation maps which clearly depict the flooded areas under conditions mentioned in Item No.2. These maps shall be included, as a minimum, the following results or parameters: time of arrival of the wave front (time from the breach to the time that a certain area is flooded), maximum depth of inundation, maximum velocity of flow and water surface elevation). i) The scale of Map shall be as stated in in scale 1:10000 and size A1, and they should contain all the information regarding the floods. The second format of the maps should be prepared for the specific purpose of the EAP, they will be issued in format A3, scale 1:10000 for non-urbanized area and 1:5000 for urbanized areas, with all the sensible installations located. ii) Inundation maps should be prepared on basis of two-dimensional depth average flow modelling. All levees, bridges, culverts and other in-line or lateral structures / obstructions must be included as per as per provisions to the extent modified and super-ceded in “the Guidelines for Developing Emergency Action plans for Dams (Feb 2016) Doc.No.CDSO-GUD-DS-01-v2.0)

Determine and identify those situations or triggering events that would initiate an emergency action and specify the actions to be taken and by whom. Identify all jurisdictions, agencies and individuals who will be involved in the EAP. Discuss the development of the EAP with these parties. Field visits for data collection, ground truthing of surveyed and satellite data along with critical locations regarding EAP are also to be included. This interaction should include discussion on the need for and operation of an emergency operations centre and reception centre, as well as a discussion of evacuation (destinations, priorities and procedures), post-flood actions (recovery and cleanup), and other measures in the event of an emergency. Identify primary and auxiliary communication systems, both internal (between persons at the dam site) and external (between dam personnel and outside entities) with presentation in easy charts for all communication. List and prioritize all persons and entities involved in the notification process and draft the Notification Flowchart. Develop a draft of the EAP as per the guidelines provided in CWC (2006) report and as per provisions to the extent modified and super-ceded in “the Guidelines for Developing Emergency Action plans for Dams (Feb 2016) Doc.No.CDSO-GUD-DS-01-v2.0).

Two Days Trainings (01 Nos.) with Hands on for Dam Break Analysis using Software, preparation of flood inundation maps officials of the dam officials and DSO officials, engineers related to dam. Also, train them on preparation of Emergency Action Plan as per CWC guidelines for Dams.

Training for officials of the dam owner and officials of other department all stake holders/ opinion makers/local administration/ police/ Fire/ Village panchayat /State disaster management unit involved in the EAP. Dissemination of the final study to all the / Stake holders / opinion makers / local administration /police/Fire/Village panchayat and also for local people who are living in the possible inundation area.

PAWAN SHIVAJI SURUNG

m/s Suyog Subhash Ghogre

The Energy and Resources Institute

INDIAN INSTITUTE OF TECHNOLOGY, ROORKEE