than

In

Th

TNA$-$

Th Instruction for Project $2$: Culvert Design

A rural road in the west coast of South Island is to be designed to connect Milford Sound to Liawrenny Peaks about $12km$ away. This proposed route Road A and B$,$ as shown in Figure $1$ below will pass through some rugged terrain and a region known for heavy rainfall. Road A and $B$ cross many streams. As one of the roading engineers for the project, you are to do one of the options for the hydraulic design of one of the $7$ culverts as listed in the relevant document in the appendix of this project brief. You also need to refer to the list for the variable design parameters for this project.From the peak discharge derived from your catchment you are to design hydraulically your culvert crossing. The size of the pipe culvert to be used is either $1500$mmo or $1800$mmo or $2100$mmo. You may use twin or triple culverts if a single culvert is not sufficient to cater for the peak flow. Assuming that the culvert is $100$m long, and the slope of the culvert barrel is $1$:$100.$ The height of Pavement Level above culvert invert invert level at inlet is $2\mathrm{.}70$m$,$ and the minimum height of the pavement above the maximum head water, Hw at inlet is $0\mathrm{.}3$m$.$ It is given that the tail water at the outlet is $1\mathrm{.}10$m high. a$)$ What are the inlet and outlet invert level of your culvert. $[1$ mark$]$ b$)$ Determine the maximum Hw at the inlet of your culvert. $[1$ mark$]$ c$)$ Assuming inlet control, for headwall with socket end inlet type, determine the size and number of pipe culvert required for your peak flow. You need to show at least three iterations for the outcomes of different culvert size and number. The marked Design chart $27\mathrm{.}3$ is to be submitted in the report. $(4$ marks$]$ d$)$ Check for outlet control using Hw$=$H $+$ h$.-$Ls$,$ and to determine if inlet or outlet control governs. Marked Design charts $27\mathrm{.}8$ and $27\mathrm{.}10$ are to be submitted in your report. You will need to look up Table $1$ for your culvert inlet type. $[5$ marks$]$ e$)$ Use the Colebrook$-$white chart to find the full flow and velocity of your culvert and determine if there is a hydraulic jump. The marked Colebrook$-$White's chart for k$=0\mathrm{.}60$mm is to be submitted in the report. $[4$ marks$)$ f$)$ What should be done if there is a hydraulic jump at the outlet? $[1$ marks$]$

Culvert: C

Annual Return Interval $($Years$)$: $80$

Runoff Coefficient $($C$)$: $0\mathrm{.}3$