logo

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

   

Added on  2019-09-30

5 Pages972 Words317 Views
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.

End of preview

Want to access all the pages? Upload your documents or become a member.