Drainage Design Manual - the City of San Luis Obispo

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SECTION 2.0PROJECTS REQUIRING HYDROLOGY/HYDRAULICS AND DRAINAGE FACILITYDESIGN REVIEWThis Manual sets forth design criteria and submittal requirements for review of developmentproposals and projects along creeks and waterways within the San Luis Obispo CreekWatershed. The City and County will use these criteria in the review of projects for their impactson creeks and waterways and for the adequacy of drainage facilities and their compliance withthe policies contained in this Manual. Drainage facility design review includes a review of thefollowing applicant-furnished information:1. Hydrologic and hydraulic analysis, including floodplain information andfloodplain determinations associated with City and County floodplainmanagement regulations and ordinances, and this Design Manual;2. Geomorphic and geotechnical channel stability assessments and bank repair andstabilization plans- when required by the City Engineer or County Public WorksDirector, and;3. Review of all stormwater drainage facilities and hydraulic structure designs forcompliance with applicable standards.2.1 Drainage Master PlanPreparation and submittal of a satisfactory Drainage Master Plan may be required as part of theapproval process for all Specific Plans and large development projects as determined by the CityEngineer or County Public Works Director. Normally a large development project will beconsidered to be projects over 1 hectare (2.5 acres). The Drainage Master Plan shall considercumulative regional drainage and flooding impacts of the development proposal, includingstream stability, and shall address mitigation requirements of the identified impacts. This impactassessment will be coordinated with any required CEQA Document, as determined by the City orCounty CEQA compliance officer. The intent of the Drainage Master Plan shall be to insure thatthe overall rate of runoff from a project does not significantly exceed pre-developmentconditions for the 2-year, 10-year, and 100-year return interval peak runoff events. If necessary,this design intent shall be achieved by incorporating runoff control measures to minimize peakflow increases (refer to Section 9.0), and/or by providing assistance in financing or otherwiseimplementing comprehensive Drainage or Stormwater Management Plans (refer to Section 3.2).SLO Creek Drainage Design Manual 3 February 2003
2.2 Drainage Design ReviewThe drainage review will be completed by the City or County Public Works Departments forcompliance with this Design Manual. Although all grading plans and drainage facilities aresubject to the review and approval of either the City or County, a more rigorous design and moredetailed drainage plan review will be completed for any proposed project located in the San LuisObispo Creek watershed that meets the following criteria:1. An applicant submits plans that require City or County review and approval of any of thefollowing:• Grading Plan covering more than 1 ha (2.5 ac); or that involves moving more than 75m 3 (100 yd 3 ) of earth• Master Plan Development• Planned Unit Development• Subdivision on more than 1.0 ha (2.5 ac)• Area Plan or Specific Plan• Drainage Master Plan2. The City Community Development Department, or County Planning and BuildingInspection Departments shall request the appropriate City Engineer or Public WorksDepartment review for compliance with this Manual for all project proposals that requireany one of the following permits or approvals:• Building• Conditional Use• Special Use• General Plan Amendment• Zoning Varianceand the project is located:1. within 30 meters (100 feet) of the centerline of a blue-line stream shown on the mostrecent U.S. Geological Survey 7.5 minute topographic quadrangle map covering the site.The stream must have an upstream drainage area or catchment over 4 ha (10 ac),and/or the project is located:2. within a 100 year floodplain as shown on the most recent FEMA Flood Insurance RateMap (FIRM) of the City or County area, or the 100 year floodplain shown on the Zone 9floodplain delineation completed for the SLO Creek Waterway Management Plan.SLO Creek Drainage Design Manual 4 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 10 and 11: DRAINAGE DESIGN MANUALFOR THECITY O
Page 12 and 13: ôó1Ragged PointSan SimeonCambriaM
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
Page 61 and 62: SECTION 5.0OPEN CHANNEL ANALYSIS AN
Page 63 and 64: 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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