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8. Adverse Effects From Impoundments. If the activity creates an impoundment water, adverse effects to the aquatic system due to accelerating the passage of water, Vor restricting its flow must be minimized to the maximum extent practicable. 4. Mann ement of Water Flows. To the maximum extent practicable, the pre- struction course, condition, capacity, and location of open waters must be maintained each activity, including stream channelization and storm water management activities, ept as provided below. The activity must be constructed to withstand expected high vs. The activity must not restrict or impede the passage of normal or high flows, ess the primary purpose of the activity is to impound water or manage high flows. The vity may alter the pre - construction course, condition, capacity, and location of open ers if it benefits the aquatic environment (e.g., stream restoration or relocation vities). 10. Fills Within 100 -Year Floodplains. The activity must comply with ale FEMA- approved state or local floodplain management requirements. 11. Eanipment. Heavy equipment working in wetlands or mudflats must be on mats, or other measures must be taken to minimize soil disturbance. 12. Soil Erosion and Sediment Controls. Appropriate soil erosion and sediment ols must be used and maintained in effective operating condition during ruction, and all exposed soil and other fills, as well as any work below the ordinary water mark or high tide line, must be permanently stabilized at the earliest icable date. Permittees are encouraged to perform work within waters of the United s during periods of low -flow or no -flow. 13. Removal of Temporary Fills. Temporary fills must be removed in their ;ty and the affected areas returned to pre- construction elevations. The affected areas be revegetated, as appropriate. 14. Proper Maintenance. Any authorized structure or fill shall be properly ned, including maintenance to ensure public safety. 15. Wild and Sce is Rivers . No activity may occur in a component of the ational Wild and Scenic River System, or in a river officially designated by Congress as "study river" for possible inclusion in the system while the river is in an official study atus, unless the appropriate Federal agency with direct management responsibility for ich river, has determined in writing that the proposed activity will not adversely affect .e Wild and Scenic River designation or study status. Information on Wild and Scenic ivers may be obtained from the appropriate Federal land management agency in the ea (e.g., National Park Service, U.S. Forest Service, Bureau of Land Management, U.S. ish and Wildlife Service). 16. Tribal Rights. No activity or its operation may impair reserved tribal rights, ig, but not limited to, reserved water rights and treaty fishing and hunting rights.