Example /A 4-hour rain of average intensity 1 cm/hr. falls over the fern leaf type catchments shown in Fig. below. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3and 4 hours, respectively, to the site 0 where the discharge measurements are made. The value of the runoff coefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attains a constant value of 0.8 after 3 hours. Determine the discharge at site O and draw the discharge hydrograph at O? Basin Isochrones Joundary Catchment area IV III 50 ha 30 ha 40 ha 20 ha Discharge site

a storm of 3 hours duration has rainfall intensities of 30 mm/h for the first hour, 50 mm/h for the second hour, and 20 mm/h for the final hour. the initial infiltration rate, f0, and the terminal infiltration rate, fc, are 22 mm/h and 5 mm/h respectively. if the excess rain is equal to 70% of the total rain, calculate the value of the decay constant, k, in the hortons's model shown below:

Please solve it again because previous solutions were wrong.

Net Storm Rainfall Example 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over 5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs = 1.008 ac-in/hr 2.0 1.5 1.0 0.5 1 3. 4 Time (hr) 700 600 500 400 300 200 100 4 8 12 16 20 24 Time (hr) Time (hr) Q (cfs) Volume (cfs-hr) 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 16 Q (cfs) iT (in./hr)