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Hydrosystems Hydrulics open channel flow iit nptel _74_

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					Hydraulics                                                                                        Prof. B.S. Thandaveswara



                22.3 Failure of Canal Lining
                In connection with the mini-hydel power plants being constructed on the Gunrur Banch

                Canal near Nekarikallu, AP, it was proposed to raise the water level in the canal by

                about 2.5 m over the previous level. The canal banks were raised by about 2 m during

                the summer of 1996. The canal banks were lined with 100 mm thick concrete panels.

                The slope of the inner canal bank is 1:1 whereas the slope of the outer bank is 1.5 : 1

                (H:V). When the water level was raised in the canal, the canal banks have exhibited

                some instability and seepage through the banks and during a thunder storm, the canal

                linings over some portion have slipped away from the banks. When the water level was

                raised and lowered, the right bank has shown some distress. In order to minimise the

                seepage, a secondary berm was constructed along the right bank at two locations. The

                secondary berm has sunk into the foundation soil.


                      0.6 m


                                                         FSL
                 0.15 m
                                        100 mm thick RCC 1:2:4 Lining              1.5 m

                                                                                              G Level Backing

                                                         BED LEVEL
                                                                                            100*300 Leg Beam
                                                                        0.5 m
                                                                        0.6 m      300*300 Model Section
                                                                           0.6 m
                                                            24.995 m




Indian Institute of Technology Madras
Hydraulics                              Prof. B.S. Thandaveswara




Indian Institute of Technology Madras
Hydraulics                              Prof. B.S. Thandaveswara




Indian Institute of Technology Madras
Hydraulics                              Prof. B.S. Thandaveswara




Indian Institute of Technology Madras
Hydraulics                                                                                                                        Prof. B.S. Thandaveswara




                               Case:1 Q = 62 m3/s
                       109.345

                 Q = 62 m3/s


                   RL 113.7             0.969
                                         60 cm
                                                   1.25                        0.969 m
                       1.2 m                 1.3            1.00
                                    1
                                                                                         1.211.169   1.00           0.969
                                  RL 112.5         1/1250                        60 cm
                                                                   2.1 m
                                                                           2
                                                                                                                      75 cm
                                                                                           1/ 800
                                                                           0.76 m 2.75                 1.65 m
                                                   800 m                                                        3
                                                                                                                              1/1500

                                                                                                                              2000 m

                                                                                 Water Surface profile




Indian Institute of Technology Madras
Hydraulics                                                                                                                     Prof. B.S. Thandaveswara


                          Case:2 Q = 27 m3/s
                       109.345

                 Q = 27 m3/s


                                       0.562
                                                  1.00                       0.562 m
                       1.2 m                              0.75
                                  1        1.25
                                                                                        1.17 1.00    0.75           0.562 m
                                 RL112.5       1/1250
                                                                 2.1 m
                                                                         2
                                                                                                                      75 cm
                                                                                             1/800
                                                                   0.4045 m       4.7
                                                                                                       1.65 m
                                                                                                                3
                                                  800 m
                                                                                                                              1/1500

                                                                                                                              2000 m
                                                                    Water Surface Profile

                               Weir at the downstream end removed
                               Q = 54 m3/s


                                   106.58                 105.85

                                      2.741 m                                  2.34 m
                 Draft Tube
                                                                                                                                       102.853

                                                                                       500

                                                                                                                    30.5 m
                                                                    Water Surface Profile




Indian Institute of Technology Madras
Hydraulics                                                                                                                      Prof. B.S. Thandaveswara



                                                                                      600 mm φ Pipe
                                       Flow

                                                397 m                                             70 m


                                                  Slope 1: 1.5


                                                                                           Right Bund
                           Slope 1:1

                                                                    By-Pass                                                          600
                                                                                                                              900
                                                                                                                 BL                   Q = 54 m3/s
                                         Flow                                                 BL + 103.84                    Flow
                       BL                                                                                        + 106.58
                       + 103.767                                                                                               900
                                                                              Power                                                  600
                                                                              House
                         Slope 1:1


                                                        Bund 6m wide


                                                          Side Slope 1: 1.5




                                                 Section

                                                                                                         Pit Details
                                                  106.58                                                600 mm 150 mm
                                                  750 mm
                                                                                           900 mm                           600 mm
                                                A Pit of
                                                900*600 mm
                                                                                                         600    150 mm

                     Plan View of the Pipe Line for supplying water for Irrigation




Indian Institute of Technology Madras

				
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