5. Four flow nets are drawn under the same piles and impervious blanket on the n

Question

5. Four flow nets are drawn under the same piles and impervious blanket on the next page. Answer the followings. (a). calculate the permeability of the soil, k-1.0x 102 cm/sec. q(A)- cross section of dams with different location of the sheet amount of flow rate q for all cases. hi 10 meter, and the coefficient of q(B)- q(C)- q(D)- (b). calculate the water pressures at A, B. C, and D. Use the following table to complete the calculations. Elevation Pressure Head (m) Head (m) Water Pressure (kN/m2) Point Total Head (m) 25 25 25 25 (c). What is an advantage of dam B over dam A? (d). What are two advantages of dam D over dam C?

Explanation / Answer

k= 10-2cm/s so in metres, = 10-4 m/s

q (A) = k *H* Nf/Nd = 1* 10-4 *10* 5/15 = 3.33* 10-4 m2/s

q (B) = 1* 10-4* 10*5/15 = 3.33* 10-4 m2/s

q (C) = 1* 10-4* 10*5/9 = 5.55* 10-4 m2/s

q (D) = 1* 10-4* 10*5/20 = 2.5* 10-4 m2/s

Points Total Head (m) Elevation head (m) Pressure head (m) Water Pressure(KN/m2)

A 35 25 10 98.1 = h* density*g

B 35 25 10 98.1

C 35 25 10 98.1

D 35 25 10 98.1

C) Advantage of Dam B over Dam A is that it has a better distribution of flow nets ,

D) Dam D has better flow net network

and a uniform potential drop pattern.

Related Questions

Navigate

• Browse (All)
• Browse 5
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.