Completed

Surface Water Hydrology

Task 1. Estimation of physical parameters Estimate the area of each sub-catchment. Compute the total catchment area. Estimate the length of channels. This will be different for different catchments. For catchment A, you will need to estimate lengths of two channels (1 to 2 and 2 to outlet) whereas for catchments B & C, you only require one channel length (1 to outlet)

Task 2. Construction of rainfall hyetographs Use the Bureau of Meteorology web site ([login to view URL]) to generate the family of IFD curves for your catchment. Use the 2016 IFD

Task 3. Construction of unit hydrographs of desired duration

You will be generating 15-minute unit hydrographs for your sub-catchments using the 15-minute unit hydrograph for a 6km2 catchment given in the table below and making reasonable assumptions (explained below).

Task 4. Construction of storm hydrographs

Construct the storm hydrograph for each sub-catchment using rainfall excess (task 2) and respective Dt-hr unit hydrographs generated above (task 3). The 3 storm hydrographs you’ve generated are the responses at the outlet of respective sub-catchments for the catchment in natural condition. Let us call it predevelopment storm hydrographs.

Task 5. Construction of network diagram, routing through channels and hydrograph computation at the catchment outlet

Your team will need to construct the hydrologic network to show connectivity of sub-catchments, channels and reservoirs (if any).

Your team will require to extract channel properties for routing the hydrographs through channels using Muskingum routing method. For this, assume the following.

weighting factor, x = 0.2

Use average channel velocity of 1.2m/sec to estimate average flow velocity in the channel.

Use this average flow velocity to estimate travel time constant, K. Use these values of x & K to route relevant hydrographs through respective channel(s) and compute the hydrograph at the outlet of the catchment.

Your team will need to discuss how you obtained these, include sample calculations and show the final result (both table and figure). All computations will be performed using a spreadsheet and the spreadsheet will also need to be submitted.

This completes generation of pre-development hydrograph at the catchment outlet.

Task 6.

Post-development hydrographs Your team will need to repeat the process, taking into account development of one of the sub-catchments. For the catchment being developed, use the following. Both initial loss and continuing loss will be reduced by 50%. 15-minute unit-hydrograph will have the following characteristics.

• Peak discharge will increase by 25%

• Time to peak will decrease by 10%

• Time base will decrease by 20%

Use the above adjustments to scale and generate meaningful post-development 15-min unit hydrograph. Your team will have to ensure that the volume balance works out. This may require a few iterations.

7 Your team will then need to construct Dt-hr unit hydrograph (post-development) for the sub-catchment being developed and use this to generate post_development catchment response.

Task 7.

Comparison of Pre- and Post-development hydrographs You will need to compare the pre-development and post-development hydrographs. Present your results in graphical form and present salient values in a tabular form. Analyse and discuss your results. You will then need to propose a solution that will ensure that the peak of the postdevelopment hydrograph at the outlet does not exceed the peak of the predevelopment hydrograph at the outlet.

Task 8.

Use HEC-HMS to verify your results This is the last step.

Software can be downloaded from

[login to view URL]

You will use HEC-HMS (latest version) to verify your results. You will need to include all HEC-HMS files in your submission.

Skills: Civil Engineering, Geology, Engineering, Excel

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Project ID: #30335645

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Bhartifreelancer

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