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Home My WebLink AboutWPO201400008 Checklist , , Albemarle County Engineering Drainage Plan checklist for plan reviewers 18 Feb 2014 (Use the latest checklist from the Team Services engineering forms site) A drainage plans is typically a component of a road plan, site plan,or stormwater management plan. It consists of the channel,ditch,culvert,or stormsewer design drawings, drainage maps,and computations for hydrology and hydraulics. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references,and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. A professional seal should be provided for any computation packages where are separate from sealed plans. Drainage: [18-32.6.2d, 14-305, 311] drainage area maps (This is a basic element, and without this there is no review) drainage computations(usually in the form of tables from the VDOT Drainage Manual App. 9B-1 LD-2014, App.7B-1 LD-268, App., App.8B-1 LD-269, etc. -computations are a basic element, and without them there is no review) all proposed and existing storm sewer must be shown in plan view X71 for residential development,principle access free of flooding during the 25yr storm [14- 410] 14-410] site runoff and entrances do not drain into streets (from VDOT Drainage Manual 9.4.5.2, 9.4.6.2) concentrated runoff(1 cfs or greater) does not run across travelways/streets (as above' following VDOT design) drainage does not run across,through, or backwater in dumpster areas [18-4.12.19] overland relief is provided for any drainage structure or inlet in case of clogging. The failure of any system will not cause structures, streets or yards to flood. {Policy} direction of flow change (or deflection angle) in each drainage structure is 90 degrees or greater(flow should not have to reverse direction) (from guide of VDOT Drainage Manual 9.4.9.3.2.3) labels on all drainage structures provided (and should match the drainage computations and profiles) 'Af a. provisions and easements for drainage across 3 or more lots. Dense development where fencing, decking, etc is expected should provide yard inlets and pipes in easements, rather than ditches {Policy} Drainage profiles: (applicable to site plans,road and drainage plans) [14-311, 18-32] drainage profiles for each pipe, structure or channel must contain: existing ground proposed ground any channel linings all utility crossings a VDOT designation (MH-1, DI-3B, etc.) for each structure throat length for each drop inlet grate type for each grate inlet a label on each structure to correspond with the computations Albemarle County Engineering Drainage Plan Checklist Page 2 of 2 material and strength class or gage of each pipe manhole access every 300' for 15"-42" or 800' for 48" or greater pipe slopes at 0.5%min. to 16%max. (per VDOT stnds for anchors over 16%) concrete inlet shaping(IS-1) specified on any structure with a 4' or greater drop safety slabs(SL-1) in any structure taller than 12'. top or rim elevation for each structure all invert elevations for each structure (with positive flow drop between inverts). end sections (ES-1) or endwalls (EW-1) on all pipe outlets. Endwalls for culverts 48"or taller scour outlet protection at all outlets, corresponding to computations (Green Brook, OP) 2 Drainage computations: (applicable to any plan proposing pipes, channels, etc.) Pipe computations for all pipes All proposed systems are designed within open channel flow capacities. (HGL computations are not necessary, and should not be relied upon unless the entire system is to be watertight.) For systems within drainage easements, all proposed pipes are a minimum 15"in diameter There are no excessive outlet velocities (> 15fps) Curb inlet computations for any curb inlets on grade All spreads are less than 10' carryover is accounted for 100% capture at entrances so no flow runs out entrances into travel lanes 100% capture, or overland flow of capacity storm, to stormwater management facilities. Typically stormwater management is designed to the 1 Oyear storm, and inlets on grade cannot capture this. Curb inlet computations for any curb inlets in sump conditions All flow depths are below 6" in the capacity table All spreads are less than 10' 100%capture to stormwater management facilities Ditch computations for any ditches ditch linings specified per plans meet velocity requirements Culvert computations for any culverts headwaters< 1.5 x culvert height, and 18"below shoulder elevation of streets. Outlet protection computations for all outlets dimensions and stone sizes for all outfalls Proposed pipe and inlet drainage area map limits of all areas and sub-areas draining to proposed structures, and existing structures or channels which will be impacted acreage of each drainage area as used in computations hydrologic coefficient for each drainage area as used in the computations time of concentration for each drainage area as used in the computations destination structure labeled for each drainage area(if not obvious) Albemarle County Engineering Stormwater Management Plan checklist for plan reviewers 5 Mar 2014 (Use the latest checklist from the Team Services engineering forms site) A stormwater management plan is a plan detailing all measures and facilities to handle and treat stormwater runoff and protect downstream waters and channels. [17-303,304, and the Virginia Stormwater Management Handbook, and the BMP Clearing House] A note to plan reviewers; This list is an aid to review. No plan is perfect. Not all items will be applicable,and some will be compromised. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references,and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. Title information: (applicable to any type of plan) XProject title. Titles should be appropriate. It should be a stormwater management plan, not an erosion control plan, or site plan etc. 2C Professional seal, with original signature and date. [18-32.6.1] Content: The stormwater management plan is a permanent document with should be part of a package for the WPO application and the VSMP. It should not be part of a site plan or road plan. These must be separate documents, to be reviewed and bonded separately. If these are included,they must be removed. VSMP general consruction permit application made with DEQ. A completed copy of the standard stormwater maintenance agreement and fee for recordation for any stormwater management facilities [17-304E] n Gv copies of manufacturer's approval of the plan for any manufactured stormwater management facilities(filterra, stormfilter, sandfilter, etc.) {Policy} pro-rated share payment for any sites which drain to County regional stormwater management facilities. (This should have been identified with the preliminary plan or plat) [17-316] Existing conditions plan view information: (applicable to any type of plan) ✓" accurate current existing topography at the time of submittal, including all existing site features, and any recent disturbances, all at a legible scale [18-32.6.2] date and source of the topographic information: [18-32.6.2] All topography should be at least visually field verified by the designer within the last year {Policy} WPO buffer limits; 100' from stream or wetland bank, 200' from reservoirs,or floodplain limit if greater [17-317] VI 4 floodplain limits, including 100yr flood limits for any channel with a drainage area of 50+acres [18-32.6.2d, 18-30.3] yall existing easements (access, drainage, sight, sanitary easements, etc.)with deed book references, locations and dimensions [18-32.6.2] 2 all critical slopes (typically shaded) [18-32.5.2] Proposed plan view information: (applicable to final site plans, road and drainage plans) Grading: [18-32.6.2, 14-303] Albemarle County Engineering Stormwater Management Plan Checklist Page 2 of 6 xproposed topography at minimum 2' contour intervals—tied into existing contours, as well as all proposed site features. (Sites with less than 6' of grade change should consider using smaller contour intervals.) ✓ proposed slopes are all 2:1 (horizontal:vertical) or flatter {Design Manual, section 8} ✓ proposed slopes steeper than 3:1 have low maintenance (not grass) ground cover 9 specified on the plan {Design Manual, Section 8} existing critical slopes are not disturbed, unless a waiver or exemption has been granted for the disturbance. [18-4.2, 14-304] ‘0 Retaining Wall Plans. Any walls supporting necessary infrastructure require engineered plans (not generic manufacturer's details) and computations. {Design Manual, section 8} This will also be required where walls are close to property lines and there is the danger of affecting neighboring property, either during construction, with later failures, or with pedestrian or vehicle safety. Easements: [Zoning Ordinance 18-32.7.4, Subdivision Ordinance, Article IV, Division 4] all proposed permanent easements, dimensioned and labeled stormwater management easements over all facilities and associated structures and access / permanent stormwater management easement encompasses 100yr high water mark, all structures (embankments if present, and culvert release channels) and access IR,, all drainage easements are a minimum 20' wide. Required width: 10'+(pipe dia. or channel width) +2'+2(depth-5'). The pipe, channel or structure must be within the center third of the easement. {Design Manual, section 6} no structures or trees within drainage easements {Design Manual, section 6} Facilies: ? stormwater facility and site layout as shown on the site or subdivision plan sheets, preferably at a scale of 1"=30' or 1"=20'. X90% or more of site development captured in facilities for water quality(ordinance requires as much as practical, 90% is a target) Albemarle County general stormwater notes ",r' facilities are not in the floodplain 'Vfacilities are not in buffer areas with Program Authority authorization mitigation plan. facilities are off-line of major streams (retention ponds might be an exception) >? facilities are not built over any other utilities (sanitary sewer, water, gas, fiber optic, etc.) v- flow is not short-circuited. A good target for flow path length is 2:1 in all water quality facilities,without the excessive use of baffles or extended dikes (VSMH 3.06-12). Cross-sections and details of each facility: Cross-sections and details should be drawn to scale. (NTS drawings can be deceptive and not identify slopes and relationships accurately) XThe existing ground should be shown in a dashed line on cross-sections. embankments (between 3 and 25 ft in height) top width 8ft min., 10' for heights 15' to 20', 12' for dams over 20',heights measured from the outside toe upstream face slope 2:1 or flatter, labeled downstream slope 3:1 or flatter, labeled /� 10yr and 100yr high water elevations labeled with 1 ft freeboard for 100yr storm with emergency spillway or 2 ft freeboard without emergency spillway • Albemarle County Engineering Stormwater Management Plan Checklist Page 3 of 6 V_ an impervious core ? a cutoff trench of minimum 4' wide, 4' deep and 1:1 sloped sides principle spillway riser crest 1' below emergency spillway if present trash racks over all inlets and controls to prevent clogging trash rack over riser crest is not flat(no DI-7's). A pre-cast anti-vortex top is acceptable, as are standing cages. Debris should fall off rit Ar riser size and materials labeled 4., \ i,,A barrel size, strength, material, inverts and slope labeled all orifices, weirs or other control devices labeled with dimensions and inverts control orifices not more than 25%of riser perimeter at any point(does not affect Rpt riser structural integrity, 25% is a target) ✓� riser base size and dimensions labeled access to riser is provided (riser should be in dam, not free-standing without structural support and analysis) emergency spillway dimensioned and labeled invert labeled dimensions in control section dimensions in channel section provided if different than control section linings labeled and shown where applicable spillway over native soils, and/or sufficient armoring provided. The spillway should never be over fill material. appropriate materials for controls (for example, a computation which relies on a flow depth in inches for flow control should not be specifying rip-rap, where this is impossible) sediment forebays provided for all retention basins, constructed wetlands, and basin biofilters at all inlets sized to 0.25"of runoff per impervious acre (can be included in WQV) direct vehicle access provided for cleanout strutural walls and weirs, like gabion baskets, need foundations and slope tie-ins. These tend to be weak points that are washed around/out. biofilters with minimum floor dimensions labeled ✓ does not receive any stream base flows, and; areas of sheet flow into facilities are protected from erosion by appropriate scour protection stone or energy dissipation measure ✓/ plants are shown and labeled with height or caliper 3 plant species are specified (3 trees if present, 3 shrubs)with sizes for survivability 7 biofilter floor is 2.5% of impervious cover for type I, or 4% of impervious cover for type II (This must be used with judgement. This assumes almost all of the area drainage to a facility is impervious. If there are large areas draining to a facility otherwise,this will not work. Also, if the water quality volume is not substantially captured,which is the intent,the water quality volume should govern.) 2.5' depth of sand/soil media ✓1'-1.5' stone drain in geotech fabric under media, with 6"perforated PVC pipe to daylight . Albemarle County Engineering Stormwater Management Plan Checklist Page 4 of 6 0.5' ponding depth provided in facility at 5% imp., 1.0' at 2.5% (see volume comments above) overflow provided V biofilter area is flat Nr cleanouts are provided at the end of the underdrain pipe, and every 50' nA in subdivisions, facilities are in open space where present. In subdivision with no open space, facilities are out of yards and away from residences. Facilities must not be a nuisance in design or location. [17-304F] overland relief is provided for any facility in case of clogging. The failure of any system will not cause structures or yards to flood [17-304F] Retentio basins f go d base flow, or 10 acres or more drain to the pond no al pool elevation is labeled on plans 15% f surface area is a depth of i,S' or less 15% f surface area is a depth o 1.5' to 2' 70% of\surface area is a depth of 2' to 6' (greater depths are counted in WQV) a 10'-15"' vegetated strip/safety bench is provided around the perimeter for Type III, a 10-15' wide and 1-1.5' deep aquatic bench is provided typical 10'x10' planting area specified for aquatic bench at lest 3 species of aquatic plant used extended detention basin II (enhanced)has marsh zones normal pool elevation is labeled on plans 20%pool areas 1.5'-4' deep 40% shallow mh 0.5'-1.5' deep, contains 1WQV 40%high marsh 0 5' deep or less as-built data is provided fo existing ponds and drainage structures and facilities existing ponds and drainage structures and facilities are brought up to current standards (the reef of this list) vehicle access roads provided to all facilities access graded to 10' width and less than 20% grade / minimum 10' wide permanent easement over access gravel surface or better for grades over 10% / underground facilities have adequate manhole access at upstream and downstream points. / manufactured pre-fabricated water quality facilities have a written approval of the plan from the manufacturer. minimum pipe sizes into and out of the facility are 15"diameter for maintenance Stormwater management computations: Maps: Existing drainage area map: existing conditions for site and off-site areas draining to proposed stormwater facilities(The stormwater management analysis should not include off-site areas PQMaes which do not drain to proposed facilities) r„ drainage divides for all drainage areas to proposed facilities as used in �"'1� computations acreage of each drainage area, labeled on the map area and matching comps X coefficient used for each drainage area as used in comps • Albemarle County Engineering Stormwater Management Plan Checklist Page 5 of 6 time of concentration for each drainage area where applicable as used in comps as closely as possible,the drainage areas represent the site development, and not off-site areas Proposed drainage area map: proposed conditions for the site and any off-site areas draining to proposed stormwater facilities. The analysis should not include off-site areas which do not drain to proposed facilities, and should not include large off-site areas in relation to the site. drainage divides for total drainage areas (not sub-areas)to proposed facilities, matching the computations. Sub-areas may be shown on added exhibits or sheets. acreage of each drainage area, labeled on the map matching comps coefficient for each drainage area, labeled on the map matching comps time of concentration for each area labeled on the map where applicable, matching comps for future development to be considered in the analysis, include assumed land uses, impervious areas, and hydrologic coefficients on the proposed drainage map Existing drainage divides should be honored as much as possible. Compensation schemes and unnatural divides which may not hold up in extreme weather are discouraged. Target Values: Water quality; removal rate computation summary for each facility agreement on target removal rates, required water quality Water quantity;„"",,- „Ak ' existing flow release summary for each facility or release point from the site tU d agreement on existing target flow rate for each release point from the site Compliance: facilities meet or exceed requirement removal rates riser floatation computations for risers which are not concrete, or are taller than 10' hydrology for each facility used to generate inflow hydrographs including; 24hr storm hydrographas are used (the modified rational method is not accepted) hydrologic land use coefficients (CN), areas and flow times are reasonable computations are provided for composite coefficients times of concentration are representative of watersheds. If the omission of small sheet flow areas yields a higher peak flow,the small sheet flow areas are not used. Sheet flow should not exceed 200'. With steep slopes it should not exceed 50'. times of concentration generally decrease with development areas over 50 acres make use of more than one hydrologic method to verify computation of peak flows contour areas and elevations used for storage, matching the plans a stage-storage (elevation vs. storage volume)table with water quality volume requirements computed for facilities with volume requirements the hydraulic dimensions and coefficients for each weir, orifice, culvert or other control structure used in the routing model, matching plans Water quality; • Albemarle County Engineering Stormwater Management Plan Checklist Page 6 of 6 drawdown computations for any extended detention facilities basins and biofilters have required water quality volume; 3WQV for type I, 4WQV for type II. °n4 Water quantity; routing model and result or each detention facility flow control is maintained by the riser when present, not the outlet barrel pipe the emergency spi$iay is not active during the 10yr storm event unless it is designed as a primary outlet struture(concrete). riser crest stays within weir flow control during the 10yr storm detention computation summary for each facility channel computations for erosion and capacity for emergency spillway channels detention storage and routings are over and above water quality volumes Y Albemarle County Engineering Erosion and Sediment Control Plan checklist for plan reviewers 5 Mar 2014 (Use the latest checklist from the Team Services engineering forms site) An erosion and sediment control plan is a document which illustrates the measures used to control erosion and sedimentation during construction. All measures follow the Virginia Erosions and Sediment Control Handbook. Reference key; [Square Brackets] are County Code references, {Curved Brackets} are policy references, and(regular parenthesis)are explanatory. Links to reference documents are provided where possible. Application information: Completed WPO application and fees, with owners signature [County Code 18-32.4.3.2, 18-32.3.9, 17-203, 17-303] Erosion Control plans require a Water Protection Ordinance (WPO) application and original owner's signature. No review is provided without application, owner signature and fees. This is true even for revisions. It is important that the owner be aware of comments and resubmittals, and this is the county assurance. Copies of federal and state permits for any wetland or stream disturbance. (Army Corps, VDEQ, etc) [17-312A,B, 17-319B,D, 17-320C,D, 18-32.1.2, 14-311] Title information: Project title. Titles should be appropriate. It should be an erosion control plan,not a stormwater plan, or site plan, etc. In some cases a WPO package will contain a stormwater plan and a mitigation plan, but they should be on separate sheets with keys and page titles. Professional seal, with original signature and date for professionally prepared plans. Content: The erosion control plan must not contain information regarding permanent improvements that do not also appear on other plans. Erosion control plans are temporary documents that are discarded after projects are complete. Existing conditions plan view information: accurate current existing topography at the time of submittal, including all existing site features, and any recent disturbances, all at a legible scale date and source of the topographic information: All topography should be at least visually field verified by the designer within the last year WPO buffer limits; 100' from stream or wetland bank, 200' from reservoirs, or floodplain limit if greater. No buffter disturbances without WPO Program Authority approval and a mitigation plan. floodplain limits, including I OOyr flood limits for any channel with a drainage area of 50+acres. Floodplain undisturbed. Disturbances require a Special Use Permit or Floodplain Development Permit. all existing easements (access, drainage, sight, sanitary easements, etc.)with deed book references, locations and dimensions all critical slopes (typically shaded) Zoning Ordinance buffers shown and protected undisturbed. Disturbances require Planning approval of a waiver. • Albemarle County Engineering E&SC Plan Checklist Page 2 of 4 Proposed plan view information: Grading: [18-32.6.2, 14-303] proposed topography at minimum 2' contour intervals—tied into existing contours, as well as all proposed site features. (Sites with less than 6' of grade change should consider using smaller contour intervals.) These should agree with other final plans. proposed slopes are all 2:1 (horizontal:vertical) or flatter {Design Manual, section 8} proposed slopes steeper than 3:1 have low maintenance (not grass) ground cover specified on the plan {Design Manual, Section 8} existing critical slopes are not disturbed, unless a waiver or exemption has been granted for the disturbance. [18-4.2, 14-304] Retaining Wall Plans approved. Any walls supporting roads or necessary infrastructure require engineered plans (not generic manufacturer's details) and computations. {Design Manual, section 8} This will also be required where walls are close to property lines and there is the danger of affecting neighboring property, either during construction, with later failures, or with pedestrian or vehicle safety. final contour shapes and slopes ensure no undrained pockets or stagnant pools Narrative: narrative and project title (Narratives are now optional, and not reviewed by the County, other than noting whether they are not seriouly in error, like a boilerplate with another County's name on it.) project _ existing site conditions description adjacent areas description off-site areas description including any off-site areas fbr borrow, waste or other disturbance. special use permit for cut greater than 50,000cy in RA zoning soils descriptions County erosion control notes stormwater runoff considerations: this can refer to the stormwater management plan sediment basin design computations summary for each sediment basin sediment trap design computation summary for each sediment trap Erosion and sediment control measures: limits of clearing and grading encompassing all disturbances, entrances, staging and parking areas, areas where sediment laden runoff will cross, or any construction related activities. This must match any landscaping and conservation plans submitted with site plans a construction entrance (CE)draining to a sediment trap or basin dust control symbols (DC) temporary and permanent seeding symbols (TS, PS) existing drainage divides existing vegetation, with trees to be saved located by drip lines. This must match any landscaping and conservation plans. protection provided for all stages/phase of construction,from initial land clearing to final grades and hardscapes. This is our most important item. Plans which show only • • Albemarle County Engineering E&SC Plan Checklist Page 3 of 4 inlet protection on proposed drainage systems, which are only possible to install upon completion of grading, should be denied without further review. no erosion control measures in the way of construction access or grading. Diversion dikes or silt fence are not placed in the middle of the site, or through access or grading. Sediment traps are not under or on top of fill material or held up by retaining walls. Construction entrances are not on fill, etc. If the concept for site protection is not adequate in this regard,further review of the plan may not be possible. existing soil boundaries are shown with labels. Areas already disturbed are indicated, with constructed fill depth or cut noted. critical erosion areas are identified; areas of constructed slopes, areas near property lines adjacent off-site disturbances are shown with erosion control facilities a stockpile location. where cut or fill balances have a 10,000 cubic yard deficit or more, plans should not be approved without a waste area identified. This must a on-site, or on another approved and permitted site. (Don't make the inspectors chase trucks to find the violation.) a staging and parking area, or other construction related areas diversion dikes are used to direct drainage to traps and basins silt fence is not used across contours in place of diversion dikes. silt fence is limited to areas of sheet flow with '/4 acre per 100ft of level on-grade silt fence. Plans showing only silt fence, without sediment trapping measures, should not be approved unless they meet this criteria and fill dirt is minimal. all swales and low points at the perimeter of the site have a sediment trap or basin. Silt fence in swales is typically not adequate. Check dams do not substitute for traps. If the concept for site protection is not adequate in this regard,further review of the plan may not be possible. temporary slope drains (TSD) or diversions are provided to prevent discharge over disturbed or fill slopes inlet protection(IP)on all inlets culvert inlet protection(CIP)on all culvert inlets outlet protection(OP) on all outlets all watercourses are protected and encroachments minimized stream crossing(USC,SC)and diversions are provided at all stream crossings. adequate channels (MS-19)provided for each outfall (see Design Manual for minimum content) all traps and basins are shown with proposed contours. Simple boxes or symbols are not sufficient, in most cases, to determine layout or bond amounts. For each trap; drainage area is 3 acres or less • sized for total drainage area, including those for in-line upstream facilities wet storage is 67cy or more dry storage is 67cy or more wet storage is 4' deep or less wet storage side slope is 1:1 or flatter dry storage side slope is 2:1 or flatter stone weir is 6ft per acre of drainage area embankment and stone weir height is 5' maximum from outside toe embankment top width is adequate (see table 16 reference) 2:1 length:width ratio for flow path • - Albemarle County Engineering E&SC Plan Checklist Page 4 of 4 For each basin; (GB 3.14) sized for total drainage area, including those for in-line upstream facilities wet storage is 67cy or more dry storage is 67yr or more wet storage side slope is 1:1 or flatter dry storage side slope is 2:1 or flatter embankment 15' high or less from downstream toe principle and emergency spillways sized per handbook requirements embankment has 1' freeboard during 25yr storm with emergency spillway embankment has 2' freeboard during 25yr storm without emergency spillway trash rack/anti-vortex device specified per handbook requirements riser anchor size specified per floatation computation dewatering device sized for 6+hr drawdown of dry storage: 3"dia. minimum safety fence and signs stating"danger, quick sand, do not enter"provided if near any residential properties, or public access structures and embankment match permanent design for facilities to be converted to permanent stormwater management facilities embankment top width is adequate (see Design Manual reference details) 2:1 length:width ratio for flow path. If necessary, baffles specified only on temporary structures (p.III-79) Details: a paved construction entrance detail (see Design Manual reference details) for projects in the development areas over 10 acres a typical section for each temporary channel or diversion, referenced from the plan sheets. Existing ground should be shown at the maximum cross-slope on the plan. details and copies of Program Authority permissions for any variances. Mass or Early Grading: mass grading Planning approval. (This is also called rough or early grading plans which contain only approximate finished grades and culverts necessary to grade) Mass grading can only be permitted within planned developments where a concept grading plan was approved with the rezoning. The agent(Director of Planning)needs to formally determine that the grading plan is in general conformity with the approved rezoning plan. Otherwise, an initial site plan needs to be approved prior to issuance of a grading permit. 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