(a) Provide three limitations that affect accuracy of the Rational Method. (b) For the following watershed in Figure Q6,

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A Provide Three Limitations That Affect Accuracy Of The Rational Method B For The Following Watershed In Figure Q6 1 (106.97 KiB) Viewed 53 times

(a) Provide three limitations that affect accuracy of the Rational Method. (b) For the following watershed in Figure Q6, design the peak discharge into each inlet and the required discharge capacity for each pipe segment using Rational Method. Use a 10 -yr return period and IDF polynomial equation for Kuala Lumpur. A, C and Tc​ are the characteristics of the subwatershed which are, area, runoff coefficient, and time of concentration, respectively. L and V is the length of the pipe and flow velocity in the pipe, respectively. ln(i)=4.970+0.670ln(t)−0.216[ln(t)]2+0.015[ln(t)]3, where i is the rainfall intensity in mm/hr and t is rainfall durations in minutes. Figure 6: Layout of the watershed (c) A catchment of 28 km2 is divided into four sections by 1-hr isochrones, namely A, B, C, D, shown in Figure Q6(a). A rain falls at the intensities of 1.0,2.0,1.6, and 2.5 cm/hr over a period of four hours (Figure Q6(b)). Estimate the peak flow of the catchment if the size of section A, B, C and D is 4,6,10 and 8 km2, respectively.