QUESTION C2 (17 marks) A farmer on the Namoi River is developing flood irrigation for her cotton farm. She has an existi

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Question C2 17 Marks A Farmer On The Namoi River Is Developing Flood Irrigation For Her Cotton Farm She Has An Existi 1 (89.99 KiB) Viewed 21 times

QUESTION C2 (17 marks) A farmer on the Namoi River is developing flood irrigation for her cotton farm. She has an existing bore that she pumps 300 L/s from a sand aquifer beneath her property. The sand aquifer lies at 80 m depth and is 30 m thick. The hydraulic conductivity of the sand is 50 m/day and the storage coefficient of the sand aquifer is 0.00015. At the end of 100 days continuously pumping, the water level in her abstraction bore is 50 m below ground surface. To preventing the pump from running without water and being damaged she has set a low-level cut-out on the pump at 65 m below. ground, 5 m above the top of the pump. She now wishes to double the irrigated area by installing a second abstraction bore at a location 1000 m to the south of the first bore on the other side of her property. Assume that the aquifer properties remain the same over the property and that the aquifer is horizontal. (a) Draw a sketch of the problem. [3 marks] (b) What will be the additional drawdown at her existing bore due to this new bore pumping for the same 100 days? Provide your answers with 6 significant figures. [5 marks] (c) Will this be an issue for her existing pump? Qualify your answer. [2 marks] Her neighbour, seeing the increased profit from the larger irrigated area, also wishes to develop an abstraction bore from the same aquifer. The neighbour's preferred location is a site 300 m to the north of the farmer's first abstraction bore. Assume that this third bore will also pump at 300 L/s for 100 days and that the aquifer properties remain the same. (d) What will the drawdown at the original farmer's first bore now be? Provide your answers with 6 significant figures. [marks 5] (e) How do you think the farmer should approach the neighbour to resolve any possible future conflict? [2 marks] 9