{"id":7787,"date":"2024-04-15T02:50:27","date_gmt":"2024-04-15T02:50:27","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=7787"},"modified":"2024-04-15T02:50:27","modified_gmt":"2024-04-15T02:50:27","slug":"if-the-length-of-overland-flow-from-the-critical-point-to-the-mouth-of-drain-is-13-58-km-and-difference-in-level-between-the-critical-point-and-drain-mouth-is-10-m-the-inlet-time-is-a-2-hours-b-4-h","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-the-length-of-overland-flow-from-the-critical-point-to-the-mouth-of-drain-is-13-58-km-and-difference-in-level-between-the-critical-point-and-drain-mouth-is-10-m-the-inlet-time-is-a-2-hours-b-4-h\/","title":{"rendered":"If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is A. 2 hours B. 4 hours C. 6 hours D. 8 hours"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;2 hours&#8221; option2=&#8221;4 hours&#8221; option3=&#8221;6 hours&#8221; option4=&#8221;8 hours&#8221; correct=&#8221;option2&#8243;]<!--more--><\/p>\n<p>The correct answer is B. 4 hours.<\/p>\n<p>The inlet time is the time it takes for water to flow from the critical point to the mouth of the drain. It can be calculated using the following equation:<\/p>\n<p>$$t = \\frac{L}{v}$$<\/p>\n<p>where $t$ is the inlet time, $L$ is the length of overland flow, and $v$ is the velocity of overland flow.<\/p>\n<p>The velocity of overland flow can be calculated using the following equation:<\/p>\n<p>$$v = \\sqrt{\\frac{g}{S}}$$<\/p>\n<p>where $g$ is the acceleration due to gravity and $S$ is the slope of the overland flow.<\/p>\n<p>In this case, $L = 13.58 \\text{ km}$ and $S = 0.001 \\text{ m\/m}$. Therefore, the velocity of overland flow is:<\/p>\n<p>$$v = \\sqrt{\\frac{9.8 \\text{ m\/s}^2}{0.001 \\text{ m\/m}}} = 31.3 \\text{ m\/s}$$<\/p>\n<p>The inlet time is then:<\/p>\n<p>$$t = \\frac{13.58 \\text{ km}}{31.3 \\text{ m\/s}} = 4.3 \\text{ hours}$$<\/p>\n<p>Since the inlet time is rounded to the nearest hour, the correct answer is B. 4 hours.<\/p>\n<p>Option A is incorrect because it is the time it takes for water to flow from the critical point to the drain mouth if the velocity of overland flow is 20 m\/s. However, the velocity of overland flow in this case is 31.3 m\/s, so the inlet time is shorter than 2 hours.<\/p>\n<p>Option C is incorrect because it is the time it takes for water to flow from the critical point to the drain mouth if the velocity of overland flow is 40 m\/s. However, the velocity of overland flow in this case is 31.3 m\/s, so the inlet time is shorter than 4 hours.<\/p>\n<p>Option D is incorrect because it is the time it takes for water to flow from the critical point to the drain mouth if the velocity of overland flow is 60 m\/s. However, the velocity of overland flow in this case is 31.3 m\/s, so the inlet time is shorter than 8 hours.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;2 hours&#8221; option2=&#8221;4 hours&#8221; option3=&#8221;6 hours&#8221; option4=&#8221;8 hours&#8221; correct=&#8221;option2&#8243;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[650],"tags":[],"class_list":["post-7787","post","type-post","status-publish","format-standard","hentry","category-waste-water-engineering","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 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