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<br />I <br />:- <br />I <br />I <br />I <br />I <br />I <br />I <br />.. ( <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />" <br />I <br /> <br />_ .L Filter gravel <br /> <br />~ dia. holes in riser <br />to dewater sadiment storage <br /> <br />Temporary storage <br /> <br />Permanent <br />pool and <br />sediment <br />storage <br /> <br />OrifICe pia <br />if required <br /> <br />Skltted riser <br /> <br /> <br />Emergency <br />spillway crest <br /> <br />PVC principal <br />spillway pipe <br /> <br /> <br />Outlet protection <br />if required <br /> <br />Figure 6_1-6: Slotted riser with PVC pipe <br /> <br />Prefabricated slotted riser <br /> <br /> <br />10/89 <br /> <br />6.1-9 <br />