Civil PE Exam - Hydraulics & Hydrology - Calculate Runoff Volume from a Hydrograph

Today, Cody Sims solves a neat breath-type problem for the Civil PE Exam for the Hydraulics and Hydrology section of the NCEES specification. It deals with calculating the runoff volume from a hydrograph for a watershed. Try to do it on your own first, then jump back in and let's solve it together. 😉
Want even MORE practice problems and materials without the ads and other stuff YT throws at you?! 🤔
Then check out our FE and PE review courses! They come with awesome on-demand lectures, a growing library of more than 300+ practice problems, free breadth and depth practice exams, and personalized support! ⬇️
📙 If you need a full-blown course to help you ace your FE exam, check out:
www.civilferev...
📚 If you need a complete review course to help you crush your PE exam, then check out:
www.civilperev...
📖 If you need individual practice exams and other great resources, check out our main site:
www.civilengin...
We are here to help you on this journey of passing your exams and getting your PE license!
OTHER CEA RESOURCES:
PE Depth Review Courses - civilengineeri...
FE and PE Practice Exams - civilengineeri...
Free Facebook Community - ceacommunity.com
Free Newsletter - civilengineeri...
Instagram - / theceacademy
Twitter - / civilengacad
Facebook - / theceacademy
LinkedIn - / civil-engineering-academy
Reach out to Isaac - [e-mail]
Let us know in the comments below: What topic do you want to see next? What are you struggling with in your studies? 👇

[@briankeithler1916]

I used Q= (05.)(qp)(T) from chapter 6 and got close and saved about 6 min. Note: Only use this if the hydrograph has a normal distribution.

[@gbelai]

What values did you use for Qp and T? Using 3.5 and 6 would give you a volume of 10.5 and that's dead even between choices A and B?

[@theengineer2020]

I take my exam tomorrow and just learned from this video that they came out with a 1.2 version of the reference manual. Does anyone know the differences between the two versions?

[@CivilEngAcademy]

If you're curious about the changes from the 1.1 to 1.2 PE Handbook this is what we are seeing so far.
Let us know if you notice any changes too!
Added new section 5.1.6 "Design Traffic" (1 page)
2. Added new section 5.4.3 "Interval Timing" (1 page)
3. Removed a section 5.5.9 "Traffic Growth Rate" (1 page)
4. Updated the title of section 6.7.1 from "Mass Calculation" to "Mass Conservation and Continuity"
5. Added new section 6.7.2 "Advection-Dispersion Reactions" (2 pages)
6. Revised the critical depth yc of trapezoid formula on page 357 (PERH 1.2) or page 349 (PERH 1.1) >> we noticed this error months ago.
7. Total pages 509 (PERH 1.2) vs total pages 497 (PERH 1.1)
8. Added qmax and qmin formula for bearing capacity (page 100)
9. Revised the USGS culvert classification (page 365)
10. Removed the Nq,Nc, Ngamma formulas (page 97) and refered students to use table only
11. Added the correction factor of groundwater table (page 98)