Hydrology & Environmental Problems on Morning Breadth
Posted 19 February 2012 - 02:43 PM
Posted 21 February 2012 - 04:47 AM
the hydropgraphs take a while to make too so i dont know if that would be on there but the chemisty stuff is hard and the 50 different processes for treatments and such....not a fan
Posted 29 February 2012 - 03:10 AM
Posted 02 March 2012 - 01:26 AM
Problem 119. The 1-hour unit hydrogrograph for a watershed is given in the figure below. A 2-hour storm of intensity of 0.5 in./hr in this watershed produces a total excess volume of water (acre-ft) of most nearly: A) 0.01, 37, C) 75, D) 450. Below the graph(discharge vs. time (which I haven't included but is not significant to solve the problem) is a table with values from the graph as follows:
Time (hours) 0 1 2 3 4 5 6
Discharge (cfs) 0 75 200 100 50 25 0
To solve, use the numbers from the table to create another table with Qu, Q1, Q2 and Qtotal. Sum the Q totals and convert from cfs to acre-ft.
Now, what is the significance of the 2 hour storm and 0,5 in.hr intensity. What is the key in these problems for knowing to use the numbers in the table as is or having to adjust for a Qu? I have seen a few problems (still going through old notes to find) where the tabular numbers given have to be adjust to the "unit" hydrograph of the storm. This problem as it stands would be simple. What throws me is knowing when to use what your are given versus when you have to convert for Qu. Thanks.
Posted 10 March 2012 - 03:50 AM
I'm looking for what wording to look at in the problem that gives the hints on how to do these problems. The ones with the hydrographs are mind teasers.
If anyone else has any tips, please speak up. We are getting on the home stretch.
Posted 16 April 2012 - 09:52 PM
You have to adjust the unit hydrograph if the duration of the precipitation is longer than the unit hydrograph duration. 1 hour hydrograph, 2 hour storm. That is what you are doing with the Qu, Q1, and Q2 because you have the discharge information.
Reply to this topic
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users