A discharge of 0.15 cumecs is supplied into a canal at the head and 0.1 cumecs is delivered to field having an area of 1.5 hac. The Irrigation is started at a moisture extraction level of 60% of the available moisture and then extends for 10 hours. Determine the following efficiencies: water conveyance, water application, water storage, and water distribution. The following information are known: effective depth of r.z. = 1.7 m, runoff loss in the field = 425 m3 , water penetration depth varies linearly from 1.7 m at the head end of the field to 1.1 m at the tail end, W.H.C. = 25cm/m depth of soil.

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Watershed area = 11.1 acres                 Average N concentration of inflow = 1.9 mg/L             Total Rainfall = 44.75 inches                  Average N concentration of outflow = 1.4 mg/L Total pond inflow = 330,441 ft3              Average P concentration of inflow = 0.42 mg/L Total pond outflow = 288,492 ft3           Average P concentration of outflow = 0.23 mg/L Total pond volume = 46,893 ft3 (this is the volume to the top of the riser before overflow occurs)   Answer the following questions: a) What percentage of the total rainflow flowed into the pond? b) If the pond were completely empty, how much rainfall in inches would be required to fill it to the total pond volume? Use your answer to question A to help answer this. c) What is the total Nitrogen load flowing into the pond in lbs/Acre/Year? d) How many lbs of Nitrogen did the pond remove over the year? e) What percentage of Phosphorous was removed by the pond?

Questions (3.2) Determine using the 'rational formula' with runoff co-efficient equal to 0.80, the peak storm runoff to be carried out by the underground drainage pipeline AB for the drainage basin area of 0.2 ha as shown in the given figure. Take the length of pipeline as 100 m and the level difference between A and B as 0.5 m. Assume initially a pipe diameter of 250 mm. Consider Darcy- Weisbach friction factor f = 0.015. The rainfall duration and rainfall intensity is furnished in tabular form below. Consider time of entry at end A as 2 min. Drainage basin Duration (mins) 2.0 2.5 3.0 3.5 4.0 4.5 A Pipeline Rainfall intensity (mm/hr) 122 108 97 89 82 77 Check whether the pipe size is adequate or not.