Drainage Design Manual - the City of San Luis Obispo

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undisturbed upstream and/or downstream reaches. Because many of the creek systems inthe San Luis Obispo area have been exposed to continuous agricultural and urbanimpacts, much of their biological integrity has been severely eroded. Depending on theintensity and history of past and present impacts, different creek reaches in SLO exhibitdifferent stages of recovery. It may even be desirable to select a stream reach outside ofthe watershed as a reference reach, if one is considered in the design process.11.5.2 Species Composition and Habitat StructureTwo very important ecological considerations for planting design are successional trendsand vegetation structure. Several studies have shown that early seral stages of ripariangrowth (i.e., emergent marsh habitat and willow thickets) favor larger numbers of certainresident and migrant birds than late successional stages. Larger mammals and other birdspecies may prefer later stages with mature stands of sycamores and dead or decadentcavity trees for nesting. The best habitats are often a mixture of the two, occurring neareach other. This is seldom the case in the SLO Creek watershed. To create a variety ofhabitats and food resources for wildlife, a mosaic of seral stages is preferred. Such amosaic should include percentages of life forms similar to those that occur onundisturbed reference reaches. The spatial arrangement of these life forms should offerwildlife patterns of vertical and horizontal structure similar to those found in referencesites. These concerns provide significant challenges to engineers who have to makechannel design decisions based on requirements for hydraulic capacity and access issues.To successfully incorporate ecological concerns, channel design decisions need to beintegrated with planting design goals.Species composition can be designed to emulate reference areas by selecting similarkinds and numbers of life forms, similar percentages of deciduous and evergreen species,and similar relative densities of species.The plant size distributions, canopy composition and relative densities of species innatural plant communities can serve as general guidelines for a planting design. However,these must be reconciled with other project considerations that also affect plantingdesign, such as hydraulic requirements, aesthetics, access, and/or security issues.SLO Creek Drainage Design Manual 141 February 2003
Table 11-6Recommended Species Composition WithinRiparian Forest Canopy Strata,Oak Woodland, and Brackish Emergent MarshStrata Species Type of SpeciesHabitat Composition Within Each StatumMixed Riparian ForestOverstory (20%) Red Tree Willow (Salix laevigata) 20%Valley Oak (Quercus lobata) 20%Coast Live Oak (Quercus agrifolia) 25%California Bay (Umbellularia californica) 20%Walnut (Juglans hindsii or J. californica) 15%Understory (60%)Oak Woodland (10%)California sagebrush, (Artemisia california) 5%Bush Monkeyflower, (Diplacus auranticus) 5%Coffeeberry (Rhamnus californica) 5%Fuchsia-flowered gooseberry,(Ribes speciosum) 5%Giant wild-rye,(Elymus (Leymus) condensatus) 10%Creeping wild-rye,(Elymus (Leymus) triticoides) 10%Coyote Bush (Baccharis p.v. consanguinea) 5%Wild Rose (Rosa californica) 5%Snowberry (Symphoricarpos alba) 5%Toyon (Heteromeles arbutifolia) 5%California Blackberry (Rubus vitifolius) 10%Arroyo Willow (Salix lasiolepis) 25%Box Elder (Acer negundo ssp. Californica) 5%Valley Oak (Q. lobata) 65%Coast Live Oak (Q. agrifolia) 35%Brackish Emergent Marsh (10%)Common Tule (Scirpus acutus) 60%Alkali Bulrush (Scirpus robustus) 20%SLO Creek Drainage Design Manual 142 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
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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
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
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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
Page 185 and 186: per second (6 feet per second). Whi
Page 187 and 188: TABLE 11-2: WOODY SHRUBS FOR SAN LU
Page 189 and 190: TABLE 11-4: GRASSES AND HERBSFOR SA
Page 191 and 192: TABLE 11-5: MARSH PLANTS FOR SAN LU
Page 193 and 194: 11.4 Planting Site Considerations11
Page 195: Where vandalism is not a problem, t
Page 199 and 200: Larger Crown TreesPlant in clusters
Page 201 and 202: plant materials (often one growing
Page 203 and 204: Exotic Treeto be RemovedNative Tree
Page 205 and 206: Step 4: Select plants suitable for
Page 207 and 208: • Exotic vegetation on the site s
Page 209 and 210: • Removal of Exotic VegetationThe
Page 211 and 212: Placement of weed control fabric or
Page 213 and 214: 11.12 Erosion Control SeedingRevege
Page 215 and 216: y wind or water runoff; should be e
Page 217 and 218: Abrasion. Removal of streambank soi
Page 219 and 220: Confluence. A junction of streams o
Page 221 and 222: Flood. A general and temporary cond
Page 223 and 224: Left Bank. The left-hand bank of st
Page 225 and 226: Shear stress. The force per unit ar
Page 227 and 228: Velocity (of water in a stream). Th
Page 229 and 230: Association of Bay Area Governments
Page 231 and 232: Hoover, Robert F. 1970. The Vascula
Page 233 and 234: U.S. Army Corps of Engineers, April
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Drainage Design Manual - the City of San Luis Obispo

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