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Image transcription text Design/Project Brief: A regional irrigation water agency is required to provide irrigation water for additional 7000 ha of land with a water share of 10 ML/ha over … Show more Design Project Brief: A regional irrigation water agency is required to provide irrigation water for additional 7000 ha of land with a water share of 10 ML/ha over 90 days period. A separate branch irrigation channel has to be designed extracting water from existing main canal at RL 250. The existing channel has enough supply to meet this additional demand. The length of the branch channel is 10 km out of which first 5 km section has a general land slope of 1 in 1000 and the next 5 km stretch has a general slope of 1 in 4000. (a) The regional agency is looking options for the design of branch channel using two different approaches: (1) design the branch channel as trapezoidal earth channel section and (2) a rectangular concrete channel section. The agency is keen to keep delivery losses (largely due to evaporation and operational procedures) of about 10 % of the diverted flow. The design should indicate any drop structure arrangements if required along the channel length. The following data is provided for the design: Water share is to be taken over 90 days Batter slopes on earthen channel: 2H:1V Limiting flow velocity to avoid scour = 0.7 m/s in case of earthen channel and 1.5m/s for concrete channel Bed width / depth ratio (b/d) = 4 Freeboard = 0.6 m Bank crest width = 2.5 m Seepage slope = SH:1V Manning’s n = 0.0275 for earth channel and n = 0.013 for concrete channel Suitably assume any missing data for this design. B

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