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26 Cards in this Set
- Front
- Back
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Equation to find flow over a rectangular weir |
Q= (2/3) Cd B( sqroot of 2g) H to the 1.5 |
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Equation for flow over v notch weir |
Q= (8/15) Cd Tan theta (sqroot of 2g) H to the 2.5 |
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Cd |
coefficient of discharge, typically .61 for weirs |
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theta |
half the vertical angle of a v-notch weir |
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B |
width of rectangular weir (m) |
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g |
gravity coefficient 9.81 m/s squared |
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factors to be considered when setting up a weir on a small stream |
what is the info required for? what degree of accuracy is required? over what timespan; days, weeks , months relatively straight section of stream must be vertical and at right angles to the flow all water must flow through weir |
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H |
head of water over crest of rectangular weir in meters |
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Flow through a pipe (meters cubed/s) |
Q= pipe csa(msquared) X velocity in m/s |
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To calculate max volume of water that could be generated in a peak rainfall event |
1. find volume in m squared 2. than mult. by impermeability factor |
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then to find flowrate from meters per hour |
divide by 60 to get per min, then divide by 60 again to get seconds
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Manning formula: to find velocity in a pipe |
(V= (m to the 0.667 S to the .5) divided by n |
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in manning formula: what is m |
Hydraulic radius: cross sectional area/ WP CSA: pie d squared divided by 4 WP: Pie times d |
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what is S |
slope: hydraulic gradient |
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What is n |
manning coefficient |
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Liters to meters cubed, you |
divide by 1000; 1000L= 1mcubed |
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Q= VxA |
repetition never hurts |
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Bernoulli's equation: z, p, w, p/w, v, g, vsquared/2g |
z=potential energy due to height above datum (m) p= pressure energy w= unit weight p/w= pressure energy per unit weight (m) v= water velocity 9.81 m/ssquared v2/2g= velocity energy per unit weight (m) |
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Torricellis theorem ( theoretical flow through an orifice) |
Q= Cd x A x ( sqroot of 2gH ) |
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Darcy equation is used to |
calculate the head loss in a pipeline due to friction |
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HL |
head loss due to friction (m) |
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f |
darcy friction factor |
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L |
length of pipeline in m |
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D |
pipe diameter |
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Find C.H by |
R.L+ B.S |
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C.H - F.S or I.S = |
R.L |
