-Hydrogelogy- does anyone can help? i can\'t really understand the questions. If

Question

-Hydrogelogy- does anyone can help? i can't really understand the questions. If someone can explain them it will be great. thank you

9. The current canal is designed to carry runoff at a rate of 100 cfs at the point where it discharges from the subdivision. Can the canal adequately handle a sustained wet period like the one measured in Table 1? To answer this question, assume that the mean daily rainfall recorded in Table 1 occurs at a constant rate. Also assume that at steady state, 90% of the rainfall reaches the drainage canal; 10% is lost to ET and groundwater flow beneath the watershed. [10) 10. What problems could arise from the assumptions in the previous question? What recommendations would you make to the contractor? [10] Table 1 Total precipitation for a three day (72 hr) storm event. Station Precipitation (in) Station Presipitation (in) 9.5 10.0 10.3 10.5 10.6 10.2 11.3 11.1 11.2 11.9 12.9 12.7 14.3 13.0 9 10 12 13 14

Explanation / Answer

Hi,

Plz post if any difficulties.

In the question 9, it is said that the discharge for the sub-division is 100 cfs.

In the table 1, the values for precipitation is calculated at different stations and it is asked if the canal can handle this storm event and sustain.

Take the 90% values of the precipitation given and multiply the precipitation value by the area covered which gives you unit in^3.

Now, this value is obtained for 3 days i.e, 72 hours. So, convert it in in^3/s and the to cfs( i.e, cubic feet/sec).

If the value obtained is more than the designed value then the canal design fails to sustain the wet period and vice- versa.

A 10] The recommendations for the contractor would be to increase the area or the depth such that the design discharge value is increased and made greater than that of the value obtained in above question.

PLZ GIVE THUMBS UP .Thanks

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