Question

Window Help 100% Wed 10:01 pm C 300786 FINAL pdf (page 3 of 11)- rh with Oe QUESTION 3 TOTAL 8 MARKS Assume that you would like to designa bridge in the South Creek near St Marys. The bridge need to be designed for 100-yr return period flood discharge. Given the annual maximum flood (Q) series data provided in the table below follows a LP3 distribution, estimate the 100-yr discharge Necessary equations and data tables are provided in the end sections of this examination paper. (5 marks) What might be the possible sources of errors in your analysis? How these might have affected your results? (3 marks) Table showing annual maximum flood discharge (m/s) in South Creek at St Marys (QUESTION 3) I 2000 2001 2003 20042005 2006 2007 2008 2009 2010 2011 2012 2002 Year 25 20 13 26 28 25 150 70 64 148 72 (ms) TOTAL 8 MARKS QUESTION4 shaes Chat (97) See More 12

Answer 1

Solution: shocoing anmual maximum fieod disahae Gm2/3) Tabls South Gneck at St.Many s in Fel ao06 Yoan acoo a004 a005 3003 aoo2 aoo1 26 a5 13 ao12 aoo9 aoo2 aolo G 143 150 25 Galeulationst be dono. LDe meod to md jo0 yoa neturon poroiod ood dieehanac, oF z-alves mean yeans of DzBtandad deuiation CND eoy tacton cemmesponding to nteroual 100 years and eefficiont of gkeoncss G Co-ofieienst of gkoconoas > IN b

Table Fo eomputahion X- осml Усат сa x Бо к а5 1.40 зо0о 80.0 О-о067 (or1-o4) (-о.о22) - о-1аа о.0за0 0 00055 ао доо 1 (30-1.42) -о.0053 3 20оа — о.366 О.1340 - о. 04905 3 i 0:48 - t. о3 0058 -1.00866 ао03 к д0о4 0.25 — о635 O 403 -0.25593 *) (р а6 аоo 5 PlALD- оi065 0, б042 -0.00027 ,cоА..1-. аоo6 145 -о. 633 О.0011 -3.5 х105 д001 S81 о-365 о.1333 .0.-042666 а5 в008 140 о. о667 1.o Oa 01064 о-034703 — о. 082 6.00055 аoo9 64 F o4945 o337226 до10 а-18 О-696 рS а01 149 0.329 3 о.4765 о:690 д01а 2 6 377 0.1424 о.053725 А"Z-3-24387 s (+ 2-05173 о,- -2 N13 cE-)TN= (-. N-1 N 00.4947C 42 У olF

So, z= 0.4947 C :-0.4a Freom table of K (C of Log- eangon lype Corneponding to T looyoas, Erterapolating boka0n thoee ualuas forn -0.5 Kz a.oa \ 955 -o.42+o.4 -0.4+ 0 5 9-1955) 2.039 Kz= a-014 Fudo - 1.49 a.014 x0.4947 2.476 2.476 299-23 m3/3 Henes; 100 yo ood dieahange aocomding to LP3 distri botion is 299 23m/3 aalyeis Croyoons ir Docunding-up onmons ( /I a8 tho data prooui ded is fo loas thar 30 yoans poegible that the toue mean and gtardand

deuiation may mot meficet n oon calaulationS, Poording proo pontion of total onporo. HocoevoYa' neally donot account fon lange Using only oUn gtatistical analysis panamotens , oz and may ke fauty. IF the Co mot computod Gooneety eco yeans data ', these parmamotora uglues deuiate foom eality; the design disckange obtaimes may eorooneoUS OYO