Laserfiche WebLink
<br /> <br />24 <br /> <br />TECHNIQUES OF WATER-RESOURCES lNVESTIGATIONS <br /> <br />)/ <br />/-/ <br />Type VType 1- ./ <br /> <br />/ // <br />/ ~//T~pel-::----- <br />/ / ----- ------ <br /> <br />1.4 <br /> <br />1.2 <br /> <br />-- <br /> <br />1.0 <br /> <br />~., <br />8" -/' <br />~ c.F'7 <br />--~ II <br />q,... ~()Ik'" <br />..- <br />/ <br />/ / <br />/ II <br /> <br />110 0.8 <br /> <br />0,6 <br /> <br />-- -,- ---,- ---- ---, <br /> <br />0,4 ----- _n +-- <br />I <br />~r\ <br /> <br />0,2 <br /> <br />30 <br /> <br />40 <br /> <br />v/ <br /> <br />,-- <br /> <br />-c--' - <br /> <br />L J <br />~-t,- <br />-L_ 'l:r ~ <br />Datum 5; L..= <br /> <br />---- <br /> <br />50 <br /> <br />60 <br /> <br />80 <br /> <br />70 <br /> <br />So D 1/3 <br />or- <br /> <br />Figure 9.-Cri,jeol ~Iope os a function of head for pipe and pipe-arc:h culverts, with fru outfall. <br /> <br />However, because the values from figures 9 <br />und 10 are only approximations, they are <br />satisfactory to use for multiplate pipe-arch <br />flow computation, <br /> <br />Rectangular sections <br />1. Compute the factors for the ordinate and <br />abscissa of figure II for the culvert, <br />Itssuming d,=0.66(hl-z), Itnd plot the <br />point" A point to the right of the line <br />indicates type I flow, Itnd a point to the <br />left. indicates type 2 flow. <br /> <br />2, Compare (rl,+z) with h., <br />3. Type 1 fio\\" can oeclIr only if the eriterioll <br />of step I is met and h.<(d,+z). If type <br />I flow is identified, compute the dischul'l;C <br />with equations :l and 5 itS outlined below, <br />Computation steps: <br />1. Compute C. <br />2, Determine d, fltctor from table on page 25, <br />3. Assume d,=d, factor times (h,-z), <br />4. With mlue of d, from step 3, enter equution <br />3 and compute Q, <br />5. Compute a,Vt'/2g, h/._" und A,. <br /> <br />e <br /> <br />-e <br /> <br />e <br />