Drainage Design Manual - the City of San Luis Obispo

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• Inlets shall be spaced so that gutter flow does not exceed a depth of 152-mm (6-inches) at the face of the curb for a 10-year storm and so that a 100-year storm willnot cause any damage and can be contained within the right of way.• Standard Catch Basin System: All catch basins shall be sumped. The main storm lineshall not pass through any catch basins or sumped manholes unless approved by theCity Engineer or County Public Works Director. No more than three catch basinsmay be connected in series before connecting to the main storm line. A ditch inlet orfield inlet may be connected directly to the end of the main storm line.• Unsumped Catch Basins: Unsumped catch basins are not allowed unless approved bythe City Engineer or County Public Works Director. If an unsumped catch basin isrequired, a sumped manhole should be constructed below the unsumped catch basinbefore the flow enters the main storm line. The main storm line may not pass throughthe catch basins or sumped manhole.• Grates shall be adequate for City Standards 3320, 3330, and 3340 and State ofCalifornia H-5-20 traffic loading.7.2.8 Junction Boxes• The use of junction boxes within the City of San Luis Obispo is to be discouraged andonly allowed upon approval of the City Engineer.• Boxes shall be constructed of Class “A” reinforced Portland cement concrete orfabricated from reinforced concrete pipe section where size limitations permit.• Minimum wall thickness for poured-in-place reinforced concrete junction boxes shallbe 150 mm (6 in).• The inside dimension of junctions boxes shall be such as to provide a minimum of 75mm (3 in) clearance on the outside diameter of the largest outfall pipe.• All junction boxes shall have the standard 600 mm (24 in) manhole cover. (PhoenixP1090, Pinkerton A640, or approved equal)7.2.9 Gutter flow, drop inlets, cross gutters, and sidewalk underdrains• Design depth of flow in gutters shall not exceed the top of a 150 mm (6-in) curb or200-mm (8-in) curb for the 10-year flow. Where the discharge gutter capacity for the10-year flow is exceeded, an underground storm drain or other facilities shall beprovided to convey the excess flow.SLO Creek Drainage Design Manual 90 February 2003
• Drop inlets shall be spaced such that gutter flow does not exceed a depth of 150 mm(6-in) at the face of the curb for a 10-year storm and so that the 100-year storm willnot cause any damage and can be contained within the right-of-way.• Cross gutters will only be permitted at intersections. Cross gutters are to be avoidedwherever possible. They will not be allowed on arterial, collectors, bus routes orcross traffic local streets.• Drop inlet, gutters, and sidewalk underdrains shall be in accordance with the typesshown on City Standards 4310,4320, 3410, 3415 & 3420.7.2.10 Hydraulic GradientThe hydraulic grade line shall be a minimum of 150-mm (6 in) below the elevation of inlet gratesand manhole covers of all structures.7.3 Design of Culverts7.3.1 ApplicationThis section shall apply to culverts placed across streams and drainageways. For culverts withdiameters of 900 mm (36 in) or greater or for driveway culverts which are part of a roadsideditch system, the County or City is the jurisdictional agency, and their road design standardsshall apply.7.3.2 Hydraulic Design of CulvertsCulverts will be designed to safely pass the flow per the catchment size standards indicated inSection 5.2.HeadwaterFor new culverts 450 mm (18 in) in diameter or less, the maximum allowable design stormevent headwater elevation (measured from the inlet invert) shall not exceed two times thepipe diameter or three times the pipe diameter with a seepage collar unless an exception isapproved by the City or County.• For new culverts larger than 450 mm (18 in) in diameter the maximum allowable designstorm event headwater elevation (measured from the inlet invert) shall not exceed 1.5 timesthe pipe diameter unless an exception is approved by the City or County.• The maximum headwater elevation of a design storm event for new culverts shall be at least300 mm (12 in) lower than the road or parking lot travel way. Culverts with catch basinsattached shall additionally maintain 150 mm (0.5 ft) of freeboard from top of grate or slottedinlet flow line.SLO Creek Drainage Design Manual 91 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
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• All streets to be dedicated to
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• A minimum setback of 15 m (50 f
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3.6.4 Preference for Vegetative and
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compliance with the measures prescr
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4.1 Hydrologic Analysis4.1.1 Genera
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Table 4-1Runoff CoefficientsHydrolo
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Overland Flow TimeSLO Creek Phase I
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Channel or Pipe Flow occurs where f
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45745766071176260955855860971166050
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Table 4-3Rainfall - Intensity Data
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4.1.4 Example ProblemA sample basin
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Table 4-7Example Composite Runoff C
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Table 4-9Example Rational Method Ru
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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
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
Page 129 and 130: SECTION 7.0DESIGN OF CONDUITS, CULV
Page 131 and 132: 7.2.3 Storm Drain Location and Alig
Page 133: In paved areas, pipe cover shall be
Page 137 and 138: Marine Fisheries Service NMFS South
Page 139 and 140: For all intermediate channels, eith
Page 141 and 142: 7.4.8 Easements for Closed Conduits
Page 143 and 144: SECTION 9.0STORMWATER MANAGEMENT FA
Page 145 and 146: Detention for the 10-year design st
Page 147 and 148: 9.2.1 Provisions For SedimentationT
Page 149 and 150: 9.5 Basin DesignDetention and reten
Page 151 and 152: mm (24 in). A corrugated metal pipe
Page 153 and 154: have side panels or other devices t
Page 155 and 156: SECTION 10.0EROSION CONTROL AND STO
Page 157 and 158: 10.3.1 Gravel Construction Entrance
Page 159 and 160: Notes:1. PLACE BALES PERPENDICULAR
Page 161 and 162: • Filter fences (also known as si
Page 163 and 164: SEED MIX ONE(Application rate = 40
Page 165 and 166: • Description of soils, geology,
Page 167 and 168: • The facilities shown on this pl
Page 169 and 170: The following control measures are
Page 171 and 172: BMP 3 Dewatering OperationsI. Defin
Page 173 and 174: BMP 5 Illicit Connection/Illegal Di
Page 175 and 176: D. All vehicles/equipment that regu
Page 177 and 178: I. Properly dispose of or recycle u
Page 179 and 180: BMP 12 Solid Waste ManagementI. Def
Page 181 and 182: H. Temporary washout facilities sha
Page 183 and 184: 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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