Determine the flow area of storm water, Civil Engineering

Assignment Help:

Storm water flows at a depth of 4 ft in the natural channel as shown in the figure. The channel has a slope of 0.0l ft/ft and n = 0.025.

487_Determine the flow area of Storm water.png

1. Determine the flow area:

    Area 1: Tan σ1 = opp/adj      adj = opp/Tan σ1       adj = 4/1.19 = 3.36 ft

               (1/2)(b)(h) = (1/2)(3.36)(4) = 6.7 ft2

     Area 2 = (b)(h) = (9)(4) = 36 ft2

    Area 3 = Tan σ2 = opp/adj      adj = opp/Tan σ2     adj = 4/0.84 = 4.76 ft

                 (1/2)(b)(h) = (1/2)( 4.76)( 4) = 9.5 ft2  

    Total Area= Area 1 +Area 2 +Area 3 = 6.7 ft2 + 36 ft2 + 9.5 ft2 = 52 ft22. 

2. Determine the flow velocity:  

v = (1.49/n) (R)0.67 (S)0.5       R = A/P      Ptotal = PArea 1 + PArea 2 + PArea 3

PArea 1 = hypArea 1    sin σ1 = oppArea 1 /hypArea 1      hypArea 1 = 4/sin σ1 = 5.2 ft

PArea 3= hypArea 3    sin σ2 = oppArea 3 /hypArea 3      hypArea 3 = 4/ sin σ1 = 6.2 ft

    P = PArea 1 + PArea 2  PArea 3 = 5.2 ft + 9 ft + 6.2 ft = 20.4 ft

    R = A/P = 52 ft2 / 20.4 ft = 2.5 ft

    v = (1.49/0.025)(2.5)0.67 (0.01)0.5 = (59.6)(1.88)(0.1) = 11.2 ft/sec

3. Determine the flow rate:    Q = vA = (11.2 ft/sec)(52 ft2) = 582 ft3/sec  

4. Determine the hydraulic grade line (HGL) at this channel section:  

    The hydraulic grade line is the depth of flow HGL = 4 ft  

5. Determine the energy grade line (EGL) at this channel section:  

    P/γ = 4ft    Z = 0 ft (bottom)    v2/2g = (11.2)2/64.4 = 1.95 ft

    EGL = 4ft + 0 ft + 1.95 ft = 5.95 ft


Related Discussions:- Determine the flow area of storm water

Show the functions of wet wells, Q. Show the Functions of wet wells? We...

Q. Show the Functions of wet wells? Wetwells are designed to store provisionallysewage/water before it is pumped out. They are generally provided for sewage and stormwater pump

Mechanism of plastic settlement in fresh concrete, Q. Mechanism of plastic ...

Q. Mechanism of plastic settlement in fresh concrete? Within a few hours after placing of fresh concrete, plastic concrete can experience cracking due to occurrence of plastic

Concrete, types of concrete and its uses

types of concrete and its uses

Explain about best hydraulic section, Q. Explain about Best hydraulic secti...

Q. Explain about Best hydraulic section? The best hydraulic section of an open channel is considered by provision of maximum discharge with a given cross sectional area. Chann

Common building stones, Common Building Stones Here describe some commo...

Common Building Stones Here describe some commonly used stones are following: a. Granite       b. Basalt and trap c. Slate          d. Sand stone   e. Marble        f.

Concrete, if the slump of concrete drops how to rectify it

if the slump of concrete drops how to rectify it

Open channel, design of irrigation channel permissible velocity table

design of irrigation channel permissible velocity table

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd