Drainage Design Manual - the City of San Luis Obispo

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ap or gabion baskets are required, vegetation must be included in the design in an “Integrated”project approach. Native plant revegetation of the bank top and adjacent bank slope areas, to themaximum extent feasible, is also to be an important component of a project. The type anddensity of vegetation will be dependent on the method of bank protection used and the physicalproperties of the stream where the repair is taking place.In Natural Channels and where flow conveyance requirements are minimal and flow velocitiesare generally moderate, vegetative methods for stream bank repair are to be selected. In AlteredNatural Channels, Constructed Natural Channels, or Modified Channels where the channelis used to convey flood flows, and where the flow requirements must be retained (such as for the25-year flood), conveyance constraints will dictate a roughness maximum which, depending onthe channel design, may limit the vegetation component of the design, and necessitate periodicvegetation management. Emphasis shall be placed on selection of appropriate Biotechnical andIntegrated approaches, as outlined in Section 3.6 of this Manual.Streambank stabilization usually involves one or a combination of the following activities: Regrading and revegetating the streambanks to eliminate overhanging banks andcreate a more stable slope; Deflecting erosional water flow away from vulnerable sites; Reducing the steepness of the channel bed through installation of grade stabilizationstructures; Altering the geometry of the channel to influence flow velocities and sedimentdeposition; Diverting a portion of the higher flow into a secondary or by-pass channel; Armoring or protecting the bank to control erosion, particularly at the toe of slope.Armoring the bank takes a variety of forms, some of them structural, but most capable ofincorporating revegetation as an essential component. The optimum, or preferred, treatment atany location along a creek is to be a function of:• Existing bank conditions;• Proximity of structures;• Cost; and,• Environmental impacts.The least environmental damaging solution feasible must be selected.Determination of the appropriate bank erosion control method is to be based on an inspection ofthe stream upstream and downstream of a project site to determine if there is an identifiablecause of the erosion. In some cases, the cause of erosion is obvious, such as a blockage (e.g.,downed tree), or weak stream banks of silt or gravel. In other cases, a further inspection isnecessary to determine if flows are being directed toward the bank from a source upstream, orwhether the channel (bed) is down cutting. These factors can affect selection of the bankprotection technique to be implemented.SLO Creek Drainage Design Manual 51 February 2003
6.3 Design ReferencesThe designer is referred to the following resources for a more detailed description of streamgeomorphic assessment techniques and approaches to biotechnical streambank stabilizationdesign. Those printed in bold face type are available for review at the City of San Luis ObispoPublic Works Department.California Department of Fish & Game, California Salmonid Stream Restoration Manual(http://ww.dfg.ca.gov/fishing/manual3.pdf)Flossi, G., S. Downie, J. Hupelain, M. Bird, R. Cowy, and B. Collins. CaliforniaSalmanoid Stream Habitat Restoration Manual. California Department of Fish & Game, InlandFisheries Division. Sacramento, California (February, 1998).Gray, Donald H. and Andrew T. Leiser, (1982), Biotechnical Slope Protection andErosion Control, Vom Nostrand Reinhold Company, New York.Kondolf, Matt and H. Pigar, (August, 2002), Methods in Fluvial Geomorphology; JohnWiley and Sons.King Co. Department of Public Works, (June, 1993), Guidelines for Bank StabilizationProjects in the Riverine Environments of King County, Seattle, Washington.National Marine fisheries Service, NMFS Southwest Region (2000), Guidelines forSalmonid Passage at Stream Crossing. http://swr.vcsd.edu/hcd/fdscg.pdf.Natural Resources Conservation Service (NRCS), (December, 1996), Streambank andShoreline Protection, Engineering Field Handbook, Chapter 16, Washington D.C.Rosgen, D., Applied River Morphology, (1996), Wildland Hydrology, Pagosa Springs,Colorado.Schiechtl, H.M. and Stern, R.,” Water Bio Engineering Techniques for Watercourse,Bank, and Shoreline Protection”, Blackwell Science, Cambridge, Massachuset, 1996, p.186.U.S. Army Corps of Engineers. (April, 1997), Bioengineering for Streambank ErosionControl, 90p., Vicksburg, MS.U.S. Department of Transportation. (1985), Streambank Stabilization Measures forHighway Engineers, National Technical Information Service PB-187986, Springfield, Virginia.U.S. Department of Transportation. (2000), Design of Roadside Channels with FlexibleLinings, HEC-15, Federal Highway Administration Number IF-00-022, Washington.Available online at http://www.fhwa.dot.gov/bridge/hydpub.htmU.S. Department of Transportation. (2001), Stream Stability at Highway Structures,HEC-20, Federal Highway Administration Number NH-01-002, Washington.U.S. Government Interagency Task Force 1998, Stream Corridor Restoration - Principles,Process, Practices. This manual was produced by a consortium of Federal Agencies and includesSLO Creek Drainage Design Manual 52 February 2003
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San Luis Obispo CreekWaterway Manag
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SECTION 4.0 HYDROLOGIC & HYDRAULIC
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SECTION 8.0 DESIGN OF DRAINAGE PUMP
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11.12 Erosion Control Seeding......
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DRAINAGE DESIGN MANUALFOR THECITY O
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ôó1Ragged PointSan SimeonCambriaM
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SECTION 2.0PROJECTS REQUIRING HYDRO
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3. or, is an individual development
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• Geomorphic, Geotechnical and St
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SECTION 3.0CORE REQUIREMENTS AND RE
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elevations, and existing channel st
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1000 0 1000 Meters1 0 1 MilesCity L
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N300 0 300 MetersLEGEND100-Year Flo
Page 29 and 30: N300 0 300 MetersLEGEND100-Year Flo
Page 31 and 32: N300 0 300 MetersLEGEND100-Year Flo
Page 33 and 34: • All streets to be dedicated to
Page 35 and 36: • A minimum setback of 15 m (50 f
Page 37 and 38: 3.6.4 Preference for Vegetative and
Page 39 and 40: compliance with the measures prescr
Page 41 and 42: 4.1 Hydrologic Analysis4.1.1 Genera
Page 43 and 44: Table 4-1Runoff CoefficientsHydrolo
Page 45 and 46: Overland Flow TimeSLO Creek Phase I
Page 47 and 48: Channel or Pipe Flow occurs where f
Page 49 and 50: 45745766071176260955855860971166050
Page 51 and 52: Table 4-3Rainfall - Intensity Data
Page 53 and 54: 4.1.4 Example ProblemA sample basin
Page 55 and 56: Table 4-7Example Composite Runoff C
Page 57 and 58: Table 4-9Example Rational Method Ru
Page 59 and 60: developed. For minor waterways and
Page 61 and 62: SECTION 5.0OPEN CHANNEL ANALYSIS AN
Page 63 and 64: case, a Natural Channel may be modi
Page 65 and 66: 5.2 Channel Design Flow Requirement
Page 67 and 68: maintenance to maintain the design
Page 69 and 70: The following guidelines should be
Page 71 and 72: Channel PlanformDrainage Design Man
Page 73 and 74: • Native vegetation shall be pres
Page 75 and 76: Manning’s Roughness Values are pr
Page 77: 6.1 GeneralSECTION 6.0ANALYSIS & DE
Page 81 and 82: stream stabilization needs totaling
Page 83 and 84: causes and modes of failure act tog
Page 85 and 86: (permissive velocity) and/or bounda
Page 87 and 88: Re-run the model after coding in th
Page 89 and 90: Step 2 - Develop and Screen Alterna
Page 91 and 92: Cost. The design must be cost effec
Page 93 and 94: Step 3 - Develop Concept Plan and D
Page 95 and 96: Legally it is up to the applicant t
Page 97 and 98: e necessary, as well as other work
Page 99 and 100: (0.6-0.9 m)(0.6-0.9 m)(152-203 mm)L
Page 101 and 102: (1.2 m)(1.2 m)(12 mm to 51 mm)(1.5
Page 103 and 104: (0.9 m)(0.6 m x 0.6 m x 914 mm)(457
Page 105 and 106: (0.6 - 0.9 m)Vegetated GeogridDrain
Page 107 and 108: Planted Rip RapDrainage Design Manu
Page 109 and 110: A-JacksDrainage Design ManualCity &
Page 111 and 112: (1.5 m)(13 to 25 mm)(0.6 to 0.9 m)R
Page 113 and 114: (13 - 25 mm)(0.6 to 0.9 m)Planted G
Page 115 and 116: (2.4 m)(2.4 m)Flow DeflectorsDraina
Page 117 and 118: performance. This technique require
Page 119 and 120: Boulder ClustersDrainage Design Man
Page 121 and 122: of a bend, and filled around and on
Page 123 and 124: horizontal line are SI (metric) nam
Page 125 and 126: GRADING OF ROCK SLOPE PROTECTION PE
Page 127 and 128: A layer of Backing No. 1 or No. 2 i
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SECTION 7.0DESIGN OF CONDUITS, CULV
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7.2.3 Storm Drain Location and Alig
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In paved areas, pipe cover shall be
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• Drop inlets shall be spaced suc
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Marine Fisheries Service NMFS South
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For all intermediate channels, eith
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7.4.8 Easements for Closed Conduits
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SECTION 9.0STORMWATER MANAGEMENT FA
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Detention for the 10-year design st
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9.2.1 Provisions For SedimentationT
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9.5 Basin DesignDetention and reten
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mm (24 in). A corrugated metal pipe
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have side panels or other devices t
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SECTION 10.0EROSION CONTROL AND STO
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10.3.1 Gravel Construction Entrance
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Notes:1. PLACE BALES PERPENDICULAR
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• Filter fences (also known as si
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SEED MIX ONE(Application rate = 40
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• Description of soils, geology,
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• The facilities shown on this pl
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The following control measures are
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BMP 3 Dewatering OperationsI. Defin
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BMP 5 Illicit Connection/Illegal Di
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D. All vehicles/equipment that regu
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I. Properly dispose of or recycle u
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BMP 12 Solid Waste ManagementI. Def
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H. Temporary washout facilities sha
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SECTION 11.0RIPARIAN REVEGETATION P
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per second (6 feet per second). Whi
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TABLE 11-2: WOODY SHRUBS FOR SAN LU
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TABLE 11-4: GRASSES AND HERBSFOR SA
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TABLE 11-5: MARSH PLANTS FOR SAN LU
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11.4 Planting Site Considerations11
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Where vandalism is not a problem, t
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Table 11-6Recommended Species Compo
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Larger Crown TreesPlant in clusters
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plant materials (often one growing
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Exotic Treeto be RemovedNative Tree
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Step 4: Select plants suitable for
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• Exotic vegetation on the site s
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• Removal of Exotic VegetationThe
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Placement of weed control fabric or
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11.12 Erosion Control SeedingRevege
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y wind or water runoff; should be e
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Abrasion. Removal of streambank soi
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Confluence. A junction of streams o
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Flood. A general and temporary cond
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Left Bank. The left-hand bank of st
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Shear stress. The force per unit ar
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Velocity (of water in a stream). Th
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Association of Bay Area Governments
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Hoover, Robert F. 1970. The Vascula
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U.S. Army Corps of Engineers, April
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Drainage Design Manual - the City of San Luis Obispo

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