Water Resources Department Tender

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)