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<br />A trickle channel notch should be provided through the crest, and good transitions <br />to the downstream trickle are recommended to minimize aggradation upstream and <br />local erosion downstream. Rock movement in the basin that results in a secondary <br />drop downstream should be avoided during construction and maintenance. The designer <br />should make sure that the client understands and accepts the safety hazards related <br />to the vertical drop, and the likely existence of ponded water, sediment, and debris <br />in the riprap basin. Measures should be taken to discourage people from being near <br />the vertical drop. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />construction flaws than sloping riprap drops. This is because the rock will largely <br />settle in place, which will then provide a deeper scour pool for energy dissipation <br />(unless the scour pool jeopardizes the wall). <br /> <br />I <br /> <br />I. <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />1JI-4 <br /> <br />I <br />I <br />