Water and Wastewater Systems (242.605) Assignment 1 – Stormwater, Water Supply and Demand


Added on  2019-09-30

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Water and Wastewater Systems (242.605) Assignment 1 – Stormwater, Water Supply and Demand Note: Assignment must be handed in by the due date and time in the box. Late assignments, less thanone week late, will incur a penalty of 20%. Assignments handed in more than one week late will not beassessed and a nil mark will be recorded. Please feel free to ask if any thing (in this assignment) is notclear to you. Assignment Weight: The total marks for this assignment are 60 (20% of the total coursework mark)Submission due: 23/09/2016(until 4:00 pm)Location: Assignment box front the P block administration office Question 1: Water Supply and Demand Requirements (Total 20 marks)a)A small town (population 2000) is to install a new water supply system. Three possible sources of water have been identified: A small river with adequate summer flow running through farmland Infiltration galleries or wells adjacent to the river A local creek from a small bush-clad hill catchment that has adequate total annual Tabulate the advantages and disadvantages of each source as shown below.AdvantagesDisadvantagesRiverGalleries / wellsBush-clad catchment(5 marks)Note: Type your answer in Microsoft word and print itb)Briefly explain when and why a storage reservoir is required to supply drinking water from a stream? Draw a clear sketch, showing normal pool level, minimum pool level, useful storage,dead storage, surcharge storage, and sluice gate/outlet. Note: Type your answer in Microsoft word and print it(5 marks) c)The population for a town is 4000 (1 + F/100). The pattern of monthly flow measured over the three consecutive driest years for a stream is given in the table below. First generate theflow records for the stream for your exercise by multiplying the given values by a factor of (1+F/100). Then: (10 marks)I.Using the Rippl method, explain if this water resource is sufficient to supply the township if the capita demand is 280 L/h/d. II.Determine the minimum storage volume required to maintain a steady supply. III.Determine the number of years the stream can supply drinking water if the population increases at a rate of 1% annually.

MonthFlow Volume ( x 104m³)June0.52.50.5July90.50.5August50.50.5September0.50.51.5October0.50.50.5November0.50.511.5December0.542January0.554February1.5135March2101April2100.5May1020.5Note: Factor F is the last digit of your ID. If your ID is 1234567, then (1+F/100) = 1.07.Question 2: Water Balance (Total 8 marks) A 4,000 km² catchment receives 102 cm of precipitation in one year. The average flow of the river draining the catchment is 34.2 m³/S. Infiltration in estimated to be 5.5 x 10^-7 cm/S and evapotranspiration is estimated to be 40 cm/yr. Determine the change in storage in the catchment over one year. The ratio of runoff to precipitation is termed the runoff coefficient. Compute the runoff coefficient for this catchment.

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