Question

Assume two-dimensional flow and complete the flow net in Fig 1 and compute: a) rate of flow in cubic meter/day if the spillway is 15 m wide b) pore water pressure at point A c) Compute and plot the distribution of pore water pressure at the base of the concrete spillway (.e. along the line C-D) If necessary, assume a suitable value for a parameter not given and dearly state it. (Hint: set Datum at the level of Tall Water) (40 marks) Concrete Spillway Tail Water I 1.5 m 1 1.5 m 3.5 m k = 1.2x10 m/sec Impervious Boundary

QUESTION:2

PLEASE MAKE SURE NO MISTAKES ARE MADE IN THE CALCULATIONS.

Answer 1

sm I Tail water 11.5m= Datum) No of flow channe Nf) = 3 No of equipotantial drop (Nd) = 10 Total head for flow (H) = 8 rate of flow (0) = K. Nt HB = 1-2X10-6m x 3x8mx.com

a = 43.2x10-6 m² sec -3.732 m² e day day (b). hydrostatic head at A=15+1.513.5 - 6.5m. head loss yet to occure at A Cupward flow) = * x3 = 8.4mi i pore water pressure at A = (6.572.4) VW - 8.9X9.8 - 87.309 kr/m²

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