Coherent Identifier About this item: 20.500.12592/2p90fm

Government of India. Central Waterpower Irrigation & navigation Research Station Poona. Research Publication No. 13. “The Behaviour and Control of Rivers and Canals (With the Aid of Models)”




DISCUSSION ON FLAT GRADIENTS OF LEFT BANK CANALS AND STEEP GRADIENTS OF RIGHT BANK CANALS AT SUKKUR The Author has repeatedly emphasized that shape and slope of a canal depend to a marked extent on the quantity of sand in movement.* If the 1942 data for the Rice Canal—which takes off from the right bank of the Indus at Sukkur—are compared with those for the Rohri Canal taking off from the left ba [...] Though this data seemed to indicate that the material entering the Right and Left Bank Canals was similar yet all other evidence went to show that this was not the case and that prior to the construction of the Approach Channel the charge of bed sand in the Right Bank Canals was very much greater than that in the Left Bank Canals. [...] VARIATIONS OF GRADE OF MATERIAL EXPOSED ON THE BEDS OF THE EASTERN NARA AND ROHRI CANALS (SIND) The present practice in connection with regulating flow into the Barrage Canals is to close the regulators from the bottom upwards to make them work as weirs and draw surface water in order to reduce the charge of sand entering the Canals. [...] THE DESIGN OF CANALS IN SIND—RELATION BETWEEN A AND Q As a preliminary step in connection with the design of canals in Sind the data available for the Sukkur Barrage Canals and the Jamrao Canal in Sind have been compared with the data available for the Lower Chenab and Lower Jhelum Canals. [...] IN CONCLUSION It appears reasonable to anticipate that at the head of a Canal: system where the bed material is coarser width will be relatively greater than near the tail owing to increased turbulence and hence increased capacity to erode the banks ; and this appears to be the eplanation why in " Canal-system formulae " the exponent in the w : q formula exceeds the 5 of Lacey ; and why the


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