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**Task**

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Get Help Now!The project has been formulated to allow you to determine the differences in catchment responses before and after development. The catchment currently is undeveloped and one of the three sub-catchments is proposed for development. It is up to your team to decide which sub-catchment you want developed. You will need to identify the sub-catchment for development in your report.

**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.**

Extract the initial and constant loss values from the ARR Data Hub web site. Make necessary adjustments and construct the rainfall excess hyetograph. You will need to explain how you achieved your result and include this in your report. Graphical representation suffices here.

For post-development condition, assume that both the initial loss and continuing loss will be reduced by 50% for the sub-catchment you’re proposing to develop. Remember you’re developing only one of the three sub-catchments, therefore loss values and rainfall excess will change only for one sub-catchment.

**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 6.15km2 catchment given in the table below and making reasonable assumptions (explained below).

You may then be required to convert thus generated 15-min unit hydrograph to another duration unit hydrograph to meet the time interval of the rainfall excess hyetograph. You may need to follow S-hydrograph method to achieve this outcome.

Use of spreadsheet will save considerable time, as the process involves repetitive computations. You will need to include your spreadsheet. A 15-minute unit hydrograph for a catchment of 6.15km2 is given in the table below.

**Task 4. Construction of storm hydrographs.**

Construct the storm hydrograph for each sub-catchment using rainfall excess (task 2) and respective ?t-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. Your team will then need to construct ?t-hr unit hydrograph (post-development) for the sub-catchment being developed and use this to generate postdevelopment 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. You may have to design a reservoir incorporating outlet structures to achieve this. If you’re to use this approach, you will need to route the post-development hydrograph through the reservoir.

You will need to discuss your strategy, provide the size of the reservoir and the details of outlet structures in your report.

**Task 8. Use HEC-HMS to verify your results.**

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

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