Laserfiche WebLink
<br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Lesson 3 <br /> <br />Culvert Design - Participant Workbook <br /> <br />3.6 OUTLET CONTROL <br /> <br />OUTLET CONTROL <br /> <br />. DEFINITION <br /> <br />OUTLET CONTROL OCCURS WHEN THE <br />CULVERT BARREL CANNOT CARRY AS MUCH <br />FLOW AS THE INLET WILL ACCEPT <br /> <br />. HYDRAULIC CONTROL IS AT THE BARREL <br />EXIT, OR FURTHER DOWNSTREAM <br />. EITHER SUBCRmCAL OR PRESSURE FLOW <br />OCCUR IN THE BARREL <br /> <br />3.22 Outlet Control <br /> <br />A. Outlet control occurs when the culvert barrel is not capable of conveying <br />as much flow as the inlet opening will accept. <br /> <br />B. The control section for outlet control is located at the barrel exit or further <br />downstream. <br /> <br />C. Either subcritical or pressure flow exists in the culvert under outlet control. <br />All the geometric and hydraulic characteristics of the culvert playa role in <br />determining culvert capacity. <br /> <br /> <br />3.23 Types of Outlet Control <br /> <br />FACTORS INFLUENCING <br />CULVERT PERFORMANCE <br />OUTLET CONTROL INLET CONTROL <br />HEADWATER DEPTH HEADWATER DEPTH <br />TAILWATER DEPTH --.. <br />INlET EDGE CONDITION INLET EDGE CONDITION <br />AREA AREA <br />BARREL SHAPE BARREL SHAPE <br />FALL ..... <br />LENGTH n_n <br />ROUGHNESS ----- <br /> <br />3.24 Inlet/Outlet Summary <br /> <br />D. Slide 3.23 illustrates typical outlet control conditions. <br /> <br />3-9 <br />