2020-11-09-minutes-public-works-study-session

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Levee Embankments For use during Initial and Continuing Eligibility Inspections of levee segmenta I systems Ratedrttia Ratting Rating Guidelines Locrtmo/Remarka iscommendakons M IThere area smell number of corrosion pinholes or cracks that could leak water and need to be irepaired, but the entire lengL`t of pipe is still structurally sound and is not in danger of co:1apsing. Pipe s^epe may be oveized in some locat_ons but does not appear to be approaching a curvature reversal. A limited number ofjoints may have opened and soil loss may be beginning. Ary open Joints should be repaired prior to the next inspection. Corrugated metal pipes, if present, may be showing corrosion and pinholes but there are no areas with total section loss. Condition of pipes has been verified using television camera video taping or visual inspection medtods within the past five years, and the report fav every pipe is available fo'review by the inspector. U ;Culvert has deterioration andlor has significant leakage; it is in danger of col:apsing or as already begun to collapse. Corrugated metal pipes have suffered 100% section loss in the invert. HOWEVER: Ever. if pipes appear to be in good condition, as judged by an externa: visual inspection, an Unacceptable Rating will be assigned if the condition of pipes has not been verified using television camera video taping or visual inspection methods within the past five years, and reports for all pipes are not available for review by the inspector, N/A There are no discharge pipes/ culverts, 12. Riprap A A INo riprap displacement orstone degradation that could pose an immediate throat to the KLOC2017_a_o004: Station _1 29+50: Some riprap Revetments & iiraegrity of channel bank. Riprap intact with no woody vegetation present, missing from toe. Slope blanket is thinner than upstream Bank Proteciion sections. Rock size is approximately 2-3 feet.: Repair during M Minor riprW displacement or stone degradation that could pose an immediate threat to the of the channel bank. Unwanted vegetation must be cleared or sprayed with an smntaltons and maintenance.integrity KLOC 20170_a_0005: Station Riprep generally in appropriate herbicide. _129+00: good canditien from here to upstream end No riprap U Significant riprop disp!acemeny exposure of bedding, or stone degradation observed. Scour downstream. Levee moves away from river.: NA (A) activity is undercutting banks, eroding embankments, or impairing channel flows by causing KLOC 2017_a_0007: Station_I 23+40; Riprap continues turbulence or shoaling. Rock protection is hidden by dense brush, trees, or grasses. along setback portion Willed with leaves.: NA (A) KLOC 2017 1_0011: Station_] 15+50: Levee is adjacent to the river downstream from here. Riprap picks up again going N/A There is no rat this feature of the segment 1 or ri is discussed in Pref P'me6 , iz'aP another section. downstream. Vegetation maintained by County frmn here downstream,: NA (A) KLOC-20i7-0-001 6: Station_] 8+00: Riprap continues downstream, but height of levee is less than 3 feet and appears to transition down the to natural bank.: NA (A) KLOC-2017—a-001 9: Station—I 5+00: Station -2 11+00: Riverward slope at 1H:1 V: Monitor fa stability and riprep displacement (A) 13. Revetments other NA A ExistingNo revetment protection is properly maintained undo aged and deafly visible reventtents other than riprap are incorporated into this than Riprap segment. M Mina revetment displacement or deterioration that does not pose an immediate threat to the integrity of the levee. Unwanted vegetation must be cleared or sprayed with an appropriate herbicide. Key: A = Acceptable. M = Minimally Acceptable; Maintenance is required. U = Unacceptable. NIA = Not Applicable. FDR = Flood Damage Reduction Flood Ramage Reduction Segment / System Levee Embankments La Inspection Report Page 4 of 5 US Army Corps Klocke (KLOC) of Eagineerse