Drainage Design Manual - the City of San Luis Obispo

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11.12 Erosion Control Seeding......................................................................... 15611.13 Grassland Conversion and Restoration................................................... 15611.14 Seeding Methods..................................................................................... 15711.15 Notice of Completion of Installation and As-Built Plans ....................... 158Appendix A: GlossaryAppendix B: ReferencesAppendicesFiguresFigure Numberfollows page1-1 Watershed Location Map.........................................................................................21-2 Watershed and Major Sub-Basins............................................................................23-1 Special Floodplain Management Zones.................................................................123-2 Floodplain Management Zone detail .....................................................................124-1 Overland Flow Time..............................................................................................254-2 Average Annual Rainfall Map...............................................................................284-3 Drainage Calculation Example Basin ....................................................................315-1 Channel Management Classification .....................................................................385-2 Constructed Natural Channel.................................................................................435-3 Channel Planform ..................................................................................................455-4 Bypass Systems......................................................................................................456-1 Live Stakes and Willow Wattles............................................................................716-2 Erosion Control Blanket ........................................................................................716-3 Brush Layering.......................................................................................................716-4 Brush Mattress .......................................................................................................716-5 Fiber Rolls/Fiber Rock Rolls .................................................................................716-6 Vegetated Geogrids................................................................................................726-7 Live Crib Walls......................................................................................................726-8 Planted Rip Rap .....................................................................................................726-9 A-Jacks...................................................................................................................736-10 Rock Walls.............................................................................................................746-11 Post and Wire Fencing...........................................................................................746-12 Planted Gabion Baskets .........................................................................................746-13 Flow Deflectors......................................................................................................756-14 Rootwad/Geogrid...................................................................................................756-15 Check Dams...........................................................................................................766-16 Boulder Cluster ......................................................................................................766-17 Lunker Structure ....................................................................................................7610-1 Gravel Entrance ...................................................................................................11310-2 Catch Basin Protection.........................................................................................11310-3 Silt Fence .............................................................................................................11310-4 Straw Wattles.......................................................................................................11411-1 Planting Zones .....................................................................................................14311-2 Vegetative Management ......................................................................................146SLO Creek Drainage Design Manual February 2003
USERS GUIDEThis Drainage Design Manual is intended to be used for the hydrologic and hydraulic analysisand the design of channel modification and drainage structures along creeks and waterwayswithin the City of San Luis Obispo and within unincorporated areas within San Luis ObispoCounty. It is intended to be used in conjunction with the City’s Construction Standards andStandard Plans and Specifications for projects within the City, and for use with the County’sStandard Plans and Specifications for projects in unincorporated areas.The Drainage Design Manual has 11 sections and two Appendices.Section 1.0 outlines the objectives of the Drainage Design Manual.Section 2.0 describes the types of projects for which the City and County will conduct areview of applicant furnished drainage plans for consistency with this Manual.Section 3.0 presents Core Requirements, which place in one section all of the drainagerelateddesign criteria and standards a project will be required to meet.Section 4.0 describes the hydrologic and hydraulic analysis procedures that are to beused in the design of drainage projects, including use of the Rational Method for runoffanalysis of small projects, use of the Zone 9 computer model for runoff analysis of largerprojects, and hydraulic analysis requirements for open channel areas of major andsecondary waterways.Section 5.0 provides the criteria and design standards for the design of open channels,including major and secondary waterways. Design flows are also presented for the majorcreeks.Section 6.0 presents the procedures for design of bank stabilization structures, as wellas a listing of preferred designs that incorporate biotechnical engineering principles.Section 7.0 provides the design criteria and design procedures for stormdrainconduits, culverts, and open channels for minor waterways.Section 8.0 summarizes information for the design of drainage pumps.Section 9.0 provides design information for projects where stormwater retention ordetention facilities are proposed.Section 10.0 outlines requirements for Erosion Control and Stormwater Management.Section 11.0 presents guidelines for revegetation planning and implementation alongwaterwaysAppendix A is a Glossary of TermsAppendix B provides a list of design referencesSLO Creek Drainage Design Manual i February 2003
Page 2 and 3: San Luis Obispo CreekWaterway Manag
Page 4 and 5: SECTION 4.0 HYDROLOGIC & HYDRAULIC
Page 6 and 7: SECTION 8.0 DESIGN OF DRAINAGE PUMP
Page 10 and 11: DRAINAGE DESIGN MANUALFOR THECITY O
Page 12 and 13: ôó1Ragged PointSan SimeonCambriaM
Page 14 and 15: SECTION 2.0PROJECTS REQUIRING HYDRO
Page 16 and 17: 3. or, is an individual development
Page 18 and 19: • Geomorphic, Geotechnical and St
Page 20 and 21: SECTION 3.0CORE REQUIREMENTS AND RE
Page 22 and 23: elevations, and existing channel st
Page 24 and 25: 1000 0 1000 Meters1 0 1 MilesCity L
Page 26: 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
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SECTION 5.0OPEN CHANNEL ANALYSIS AN
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case, a Natural Channel may be modi
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5.2 Channel Design Flow Requirement
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maintenance to maintain the design
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The following guidelines should be
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Channel PlanformDrainage Design Man
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• Native vegetation shall be pres
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Manning’s Roughness Values are pr
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6.1 GeneralSECTION 6.0ANALYSIS & DE
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6.3 Design ReferencesThe designer i
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stream stabilization needs totaling
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causes and modes of failure act tog
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(permissive velocity) and/or bounda
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Re-run the model after coding in th
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Step 2 - Develop and Screen Alterna
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Cost. The design must be cost effec
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Step 3 - Develop Concept Plan and D
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Legally it is up to the applicant t
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e necessary, as well as other work
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(0.6-0.9 m)(0.6-0.9 m)(152-203 mm)L
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(1.2 m)(1.2 m)(12 mm to 51 mm)(1.5
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(0.9 m)(0.6 m x 0.6 m x 914 mm)(457
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(0.6 - 0.9 m)Vegetated GeogridDrain
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Planted Rip RapDrainage Design Manu
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A-JacksDrainage Design ManualCity &
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(1.5 m)(13 to 25 mm)(0.6 to 0.9 m)R
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(13 - 25 mm)(0.6 to 0.9 m)Planted G
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(2.4 m)(2.4 m)Flow DeflectorsDraina
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performance. This technique require
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Boulder ClustersDrainage Design Man
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of a bend, and filled around and on
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horizontal line are SI (metric) nam
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GRADING OF ROCK SLOPE PROTECTION PE
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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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