There are two submissions for this assignment:
Submission:
There are two submissions for this assignment:
A brief report (max page count = 10 pages) as a single PDF file
Your EPAnet model (.net) file uploaded to the Bb submission pageFor the report, the file should have standard (25.4mm) margins, minimum font size 11. The maximum page count includes any appendices, contents page and/or cover page (if you choose to include these), but excludes references. Scanned hand calculations, where deemed appropriate, should be neat and clear, and properly signposted (defining variables, equations and solutions where needed). Diagrams must be numbered, clearly captioned and appropriately referenced in text. Written text should be accurate and succinct, with minimal ambiguity or inaccuracy.
Failing to meet the submission requirements detailed above will result in a lower mark being awarded than that suggested by the rubrics given in the assignment. EnhancedMetaFilefalsef 0sEnhancedMetaFilefalsef 0EnhancedMetaFilefalsef 0s
Part B (50% of Assignment)
Due to political pressure, a well established water utility has just taken over the management and operation of a small rural water network. This network was previously run by a small company who had limited expertise and collected minimal data on the network.
The network as built is shown in Figure 4. The roughness of the PE pipes can be assumed to be very low, and the steel pipes are expected to have a roughness of 0.2mm.
The network is fed by a gravity main 5km to a tank, which has a reduced (ground) level of 5m, a diameter of 10m, and a maximum depth of 5m (i.e. maximum water surface is 5m above the ground level). There are two pumps within the network which are variable speed pumps. In order to model this correctly, they should be set up as using a single point pump curve (200L/s, 20m), followed by a PRV with a maximum head of 20m.
1034767240471
Figure 4 - Existing Water Supply Network
As the network data was not well monitored, the nodal demands are not known. It is known that total revenue water demand (i.e. the water that flows through clients metres) is on average 3.65ML/day, and the total water supplied (including both revenue and non-revenue demand) is 4.23ML/day. The utility is aware of maximum and minimum average daily demand multipliers which are typically 1.43 and 0.52 respectively.
The new owners of the network have measured the pressures at the nodes of the network, that data is given in Table 3. You can assume these pressures are a fair representation of the average pressures over a 24hr period (or the pressures at average demand).
Difference between largest and smallest of the last digit of each
student number1
Node 0-2 3-5 6-9
1A 19.94 19.93 19.90
1B 16.87 17.72 16.72
1C 17.01 18.07 17.14
1D 16.70 17.76 17.00
2A 15.16 16.02 15.37
2B 14.80 15.89 15.24
3A 13.74 13.95 13.72
3B 14.90 14.92 14.95
3C 14.75 14.52 14.33
Table 3 - Average Nodal Pressures (m)
Tasks:
Using the values from Table 3, determine the flow through the network and therefore identify the average flow demands at each node. You should also propose a method, with references and/or valid precedent, of splitting these demands into the real (revenue) demand, and leakage.
Using either a Hardy-Cross or EPAnet model, you must calculate the pressure at each node for peak flow and minimum flow times, noting, justifying and discussing any assumptions you needed achieve this.
The network will need to be expanded by including the following new nodes and demands, which will have a demand depending on your student numbers, as shown in Table 4. You should ignore the greyed out nodes for your student numbers combination (you do not need to provide a connection to this node).
Sum of the last digit from each student ID
number2Node 0 7 8 12 13 18
4A 6.5 6.5 6.5
4B 6 6
4C 6 8
4D 8 8 Table 4 New Network Node Demands (L/s)
Develop the network to include the required new nodes. You must ensure that the nodal pressure stay above 8m and below 30m head under all typical daily flow rates. You should aim to minimise alterations to the current network but can replace or remove pipes if needed.
No additional source is available, but other tanks can be added to the network if deemed appropriate. You cannot change the pump curve, but may install additional pump(s) which should be modelled using the same combination.
2 Considering the pair working on Part B. If working individually, use the last 2 digits of your student number. If more than 2 students are working on this Part, then pick two student numbers at random.
.
Important Notes:
It is vital that you use the same node labels as in Figure 4. The accuracy of your report depends on the values provided against nodes being labelled the same as nodes in the figure.
The model used (either EPANET (.net), excel (.xlsx) or matlab (.m) file) must be uploaded as part of your submission. If you completed Task 7, upload your solution to this. Otherwise, upload your solution to Task 6.
