Drainage Design Manual - the City of San Luis Obispo

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DRAINAGE DESIGN MANUALFOR THECITY OF SAN LUIS OBISPO AND PORTIONS OF SAN LUIS OBISPO COUNTYWITHIN THE SLO WATERSHEDFOREWORDThis Drainage Design Manual (Design Manual) has been developed to provide criteria andplanning procedures for floodplains, waterways, channels, and closed conduits in the San LuisObispo Creek watershed. This Drainage Manual will be used by the City of San Luis Obispo andSan Luis Obispo County Flood Control and Water Conservation District Zone 9 (SLO/Zone 9)staff in their internal design of stormwater drainage, flood management and bank stabilizationand restoration projects.In addition, private property owners submitting applications for grading and building permitswithin the City limits, and those seeking similar permits from the County for projects within theSLO Creek watershed (Zone 9 service area) will be required to follow these guidelines andprocedures. The City and County will use the design criteria in drainage facility design reviewand the checking of design and construction of private projects, including projects, which, uponcompletion, will be managed and maintained by these agencies.Drainage facility review as used here is meant to be inclusive of the review of all drainage andhydraulic structures, including review of all supporting engineering calculations. Drainagefacilities include but are not limited to: hydraulic structures, open channels, closed conduits,pipes and culverts, stormwater management structures, bank stabilization and bank repairstructures, and grade control and aquatic enhancement structures that may be placed in streamchannels. Guidelines for stream corridor planting and management, and bank repair andstabilization structures and devices are also provided in this Manual. General erosion controland stormwater management requirements are also included.It is critically important that any proposed channel modification and/or drainage improvementproject preserve, protect, and enhance the waterways within the SLO creek watershed, includingstreamside or riparian vegetation and aquatic habitat and fisheries. Although specific designcriteria and design procedures are presented, the design engineer is invited to be as creative aspossible in ways that provide functional, safe and aesthetically pleasing channels or waterways,which are also compatible with the environment. Alternate methods of analysis and design aresubject to the approval of the City Engineer, or County Public Works Director. Earlyconsultation with the City Engineer and Natural Resource Manager, or the County Public WorksDirector, and collaboration with stream geomorphologists and biologists prior to completingengineering designs that potentially impact creek resources in this watershed is stronglyencouraged.SLO Creek Drainage Design Manual 1 February 2003
SECTION 1.0DRAINAGE MANUAL OBJECTIVESThis Design Manual provides design guidelines and criteria to meet the following surface watermanagement objectives:1. Insure that stormwater runoff in the San Luis Obispo (SLO) Creek watershed isadequately controlled to reduce flood and environmental damage from new developmentand redevelopment projects. The limits of the SLO Creek watershed that are addressed inthis Manual are shown on Figures 1-1 and 1-2.2. Insure that stormwater is carried through a system of waterways and conduits in such away that flood water surface elevations and corresponding flood damage does notincrease, damage is minimized at existing and future building sites, and existing floodwater surface elevations are reduced wherever feasible;3. Insure that the creeks, channels, and waterways remain relatively stable, or are stabilizedfollowing development or redevelopment projects, and other projects such as bank repairand hydraulic structures constructed near or along the waterways;4. Preserve and protect natural biological resources along creeks and waterways, includingtheir functions and values, and ensure that they are restored and enhanced whereverpossible, and;5. Protect and improve water quality.SLO Creek Drainage Design Manual 2 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 8 and 9: 11.12 Erosion Control Seeding......
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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