high bank to top of high bank to help prevent scouring within the structure or at <br />the outlet during less frequent floods. <br />N Crossings over Category A or Category B streams as identified in the Goal 5 Water <br />Resources Conservation Plan shall utilize bridges or natural substrate culverts <br />where possible. Where practicable, the lower lip of any natural substrate culvert <br />shall be embedded at least 1 foot for box culverts and pipe arches, and at least <br />25% of the pipe diameter for pipe culverts. The substrate within the structure shall <br />match the composition of the substrate in the natural stream channel at the time <br />of construction. The substrate shall either resist displacement during flood events <br />or the structure shall be designed to maintain an appropriate bottom through <br />natural bed load transport. <br />(c) Bridges and culverts on Category A or Category B streams as identified in the Goal <br />5 Water Resources Conservation Plan shall be constructed so that the "openness <br />ratio" of the structure is equal to or greater than 0.25. The "openness ratio" is the <br />cross -sectional area of the passage area under or within the structure divided by <br />the length of the stream segment it crosses over. For a box culvert, the openness <br />ratio shall be (height x width)/length. <br />(d) Culverts shall not substantially increase or decrease water depth or flow rate <br />conditions upstream or downstream from the culvert. <br />(e) The lower lip of all culverts shall meet the stream or channel bed at or below <br />grade. <br />(f) Culverts shall be the minimum length practicable, and fill on top of the culvert shall <br />have the minimum footprint practicable. <br />An underground 12-inch storm drain line existed in this location prior to this application and <br />development proposal. The drainage line spans beyond the area of road construction, <br />conveying runoff from the Goal 5 stream north of the street into Videra Park and Videra Creek <br />to the south. The existing culvert will remain intact without modification beneath the proposed <br />public roadway. To the extent that it is relevant, the applicant has sited the road location over <br />this drainage line, limiting the impact to non -piped portions of the water resource. <br />Based on the existing culvert, which appears to function as intended by conveying stream <br />runoff to Videra Park, and that the prosed road construction will not alter the existing culvert or <br />have any impact on the stream channel, the proposal is consistent with the requirements of <br />this standard. T <br />(11) Interpretive Facilities. Within the /WR conservation area, boardwalks, viewing <br />platforms, interpretive information kiosks, trail and interpretive signs shall be <br />constructed in a manner that involves the least removal of native vegetation <br />March 2026 Findings & Decision of the Planning Director Page 19 of 28 <br />Braewood Hills Third Addition (SDR 25-02 & PDF 25-01) <br />