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Chapter 153 Water Resource Management Adopted 6/28/2022 Page 23 of 34 (b)When changes caused by a land disturbing activity result in alterations to flow paths which impound or slow down water on an adjacent property. (c)When changes caused by a land disturbing activity reroute water onto a neighboring property, where it wasn’t previously routed. § 153.57 STREAM CROSSING STANDARDS. Construction, replacement, removal, or improvement of a crossing as defined in these rules will: (A)Retain adequate hydraulic capacity and assure no net increase in the flood stage of the pertinent waterbody. (B)Not change the existing flowline/gradient, or cause increased scour, erosion, or sedimentation. (C)Not adversely impact properties adjacent to the stream (examples include impeding drainage, inundation of land or structures in the 2-year event or higher, etc) (D)Mimic channel bottom relative to upstream and downstream conditions. Lining channel bottoms with riprap should be avoided when possible. (E)Maintain existing fish passage in the waterbody for fish species native to the area. § 153.58 MAINTENANCE PERMIT STANDARDS. Projects meeting the standards described below automatically qualify for a General Maintenance Permit. (A)For all projects meeting the thresholds described in § 153.44, a General Maintenance Notification Form must be submitted to the county 10 business days prior to the start of the activity. The county reserves the right to provide review comments within 10 business days of receipt. (B)Projects which involve the replacement of existing crossings as defined in these rules and result in changes to the hydraulic profile of the waterbody in the 2-, 10-, and 100-year storm events that are minor enough to result in no adverse impacts to structures or watercourses: (1)Crossing replacement may not result in a net increase in the flood stage of the pertinent waterbody from the existing bridge condition; (2)Crossing replacement may not adversely affect water quality, change the existing flowline/gradient, or cause increased scour, erosion or sedimentation; (3)Crossing replacement must be timed in a way to protect the surface water from sediment pollution (i.e. during frozen conditions or not preceding a forecasted rain event); (4)Bare areas must be stabilized with erosion control BMPs, vegetation, and/or other approved measures according to the stabilization timelines identified in the general NPDES permit, as amended from time to time.