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Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Stormwater Management Concept Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
A. General Project InformationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Address and legal description of site2. Vicinity map3. Project narrative
a. Purpose of projectb.
c.
d.
4.
5. Incentive Standards
a. Redevelopmentb. Brownfield redevelopmentc. High density (>7 units per acre)d. Vertical densitye.
TOTAL VOLUME CREDIT (Up to 0.75 inches):
6.I. Non-structural practices
a. Better Site Designb. Natural area conservation/restoration
A completed application and stormwater management concept plan shall be submitted for each development subject to the stormwater management ordinance. The stormwater management concept plan shall be reviewed according to the following criteria.
Impact of development on site hydrology and stormwater qualityDescription of stormwater management systemRationale for selection of stormwater treatment practices
Evidence of hotspot runoff that may require pretreatment or enhanced treatment
Mixed use and transit-oriented development
Type of stormwater management practices planned for site
c. Sheet flow to vegetated filter stripd. Sheet flow to conservation areae. Impervious area disconnection
II. Structural practicesa. Stormwater pondb. Stormwater wetlandc. Filtrationd. Infiltratione. Bioretentionf. Water quality swaleg. Permeable Pavementh. Regenerative Stormwater Conveyancei. Rainwater harvestingj. Vegetated roofg. Grass swale
III. On-lot practicesa. Impervious disconnectionb. Rain gardenc. Soil-amended filter pathd. Rainwater harvestinge. Other:
B. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
a. Catchmentsb. Drainage areas & flowpathsc.
d.
e. Stream reachesf. Proposed channel modifications
3. Predominant soil types4.
5.
6. Floodplain/floodway limits7. Development setbacks
a. Stream buffersb. Stormwater pond/wetland buffersc. Building setbackse. Property line setbacks
Existing and proposed topography (minimum 2-foot contours or local standard)
Existing and proposed stormwater management system
Stormwater management practices: types identified and adequate surface area allocated on plan
Proposed drainage and maintenance access routes and easement locations
Existing land cover/land use and proposed limits of disturbanceResource protection areas (e.g. sensitive streams, wetlands and lakes)
f. Well setbacksg. Septic system setbacks
8.
9.
C. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
3.
4.
D. Permit Approval and DocumentationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a.
b.
c. Dam safety permitd. Floodplain/floodway construction permite. Other Type of permit:
2. Site visit and field verification
E. Better Site Design (BSD) & Smart Growth SupplementS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1 Site Layout BSD Techniques
a.
b. Amount of grading minimizedc.
d.
e.
Existing and proposed roads, buildings and other structuresExisting and proposed utilities and utility easements
Preliminary spreadsheet/calculations for 1-inch performance standard
Preliminary stormwater management practice sizing calculationsPreliminary analysis of potential downstream impacts of projectDrainage area to stormwater practice(s) within recommended range for selected practice type(s)
Status of other applicable local, state and federal permits
Construction stormwater discharge permitState/federal permit for stream and wetland impacts
Pre-development natural drainage pathways, soil characteristics, topography, and vegetative cover identified
Steep slopes (as locally defined) left in natural conditionOpen space and other natural areas preservedBuffers provided on intermittant streams and wetlands
f.
g. Street Length Minimizedh.
i. Stream crossings minimizedj.
k.
l.
m.
2.
a.
b.
c. Urban forestry, tree preservationd. Green roofs
3
a. Shared parking used b. Structured parking usedc.
d.
e. Compact car spaces providedf.
g.
Additional Comments:
Floodplains for intermittant streams left in natural condition
Street width and ROW width are minimum allowed
Cul-de-sacs alternatives selected (hammerhead, loop road)Cul-de-sac diameter is minimum allowedGrass swales used in lieu of curb & gutterMinimize driveway lengths/widths or use shared driveways
Site Layout Techniques for Infill/Redevelopment (component of local Smart Growth policies)
Setbacks and/or height restrictions reduced for efficient use of spaceTransit, pedestrian, and bicycle access & facilities
Parking Lot BSD & Smart Growth Techniques
Pervious parking for overflow and/or regular spaces (w/ optional stormwater storage below)
Minimum number of parking spaces provided
Parking lot designed to sheet flow to vegetated areas
Parking lot graded toward landscaped islands, perimeter landscaping, and/or bioretention
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Stormwater Management Design Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
A. General Project InformationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Address and legal description of site2. Vicinity map3. Project narrative
a. Purpose of projectb.
c.
d.
4.
5.I. Non-structural practices
a. Better Site Designb. Natural area conservation/restorationc. Sheet flow to vegetated filter stripd. Sheet flow to conservation areae. Impervious area disconnection
II. Structural practicesa. Stormwater pondb. Stormwater wetlandc. Filtrationd. Infiltratione. Bioretentionf. Water quality swaleg. Grass swale
III. On-lot practicesa. Impervious disconnection
Impact of development on site hydrology and stormwater qualityDescription of stormwater management systemRationale for selection of stormwater treatment practices
Evidence of hotspot runoff that may require pretreatment or enhanced treatmentType of stormwater management practices planned for site
b. Rain gardenc. Soil-amended filter pathd. Rainwater harvestinge. Other:
B. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.a. Catchmentsb. Drainage pathsc. Stormwater management practicesd.
e.
f. Stream reachesg. Proposed channel modifications
3. Predominant soil typesa. Location of soil borings (if applicable)
4.
a.
b.
5.
6. Floodplain/floodway limits7. Development setbacks
a. Stream buffersb. Stormwater pond/wetland buffersc. Building setbacksd. Property line setbackse. Well setbacksf. Septic system setbacks
8.
9.
10.
a.
Existing and proposed topography (minimum 2-foot contours)Existing and proposed stormwater management system
Drainage and access routes and easementsMaintenance access routes meet acceptable design standards
Existing land cover/land use and proposed limits of disturbance
Infiltration facilities located outside of limits of disturbanceVegetated filter strip and conservation areas outside of limits of disturbance
Resource protection areas (e.g. sensitive streams, wetlands and lakes)
Existing and proposed roads, buildings and other structuresExisting and proposed utilities and utility easementsErosion and sediment control plan (NOTE: Full ESC checklist not provided here)
Infiltration areas not used as sediment basins during construction
b.
c.
d. Tree save areas consider root zonee.
f.
11. Landscaping plana.
b.
c.
12. Maintenance O&M plans provided
C. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a. Drainage areas and design pointsb.
c. Curve number assumptionsd. Flow paths and times of concentratione.
f.
g. Total runoff volumes 2.
a. Drainage areas and design pointsb.
c. Curve number assumptionsd. Flow paths and times of concentratione.
Plans clearly indicate how sediment will be prevented from entering stormwater management system during construction
Cleared area minimized by clearing only areas that must be graded
Tree save areas to be marked in the fieldLimit of disturbance to be marked in the field
Planting plan meets acceptable design standards and/or planting plan prepared by certified professional
Planting instructions, schedule and details includedDams and principal spillways kept free of woody vegetation
Pre-development hydrologic/hydraulic analysis (show methodology and supporting calculations)
Land use, soil type and impervious cover assumptions
Summary of design storms analyzed (applicable as per local code)Peak runoff rates (applicable as per local code)
Post-development hydrologic/hydraulic analysis (show methodology and supporting calculations)
Land use, soil type and impervious cover assumptions
Summary of design storms analyzed (applicable as per local code)
f.
g. Total runoff volumes for 1" rainfall3.
a. Treatment Volume, Tvb.
c.
d.
e.
f. Other4.
a.
5.
a.
6.
a.
7.
8. Dam breach analysis (if applicable)9. Flood study (if applicable)10.
D. Construction SpecificationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
E. Construction SequenceS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments
Peak runoff rates (applicable as per local code)
Calculations for relevant stormwater design criteria
Channel protection volume, Cpv (applicable as per local code)Groundwater recharge volume, Rev (applicable as per local code)Overbank flood protection volume, Qp (applicable as per local code)Extreme flood protection volume, Qf (applicable as per local code)
Stormwater management practices sized to reduce 1" rainfall
Results of runoff reduction analysis in WV Design Compliance Spreadsheet
Hydraulic analysis of conveyance system and inlet and outlet structures
Velocity of discharge from practice infalls and outlet
Outlet rating curves and stage-storage-discharge relationships for storage facilities
Compliance with post-development peak discharge requirements
Analysis of potential downstream impacts of project
Supporting structural calculations (if applicable)
Consistent with project plans: stormwater practice plan, profile, and cross-section details providedSpecified materials and installation procedures meet acceptable design standards
1.
2.
F. Permit Approval and DocumentationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Certification of registered professional2. Certification of owner3. Date of approval:
a. Record of all major permit decisions4.
a.
b.
c. Dam safety permitd. Floodplain/floodway construction permite. Other Type of permit:
5. Performance bond/guarantee6. Necessary legal agreements
a. Easementsb.
E. Better Site Design (BSD) & Smart Growth SupplementS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1 Site Layout BSD Techniques
a.
b. Amount of grading minimizedc.
d.
e.
f.
g. Street Length Minimizedh. Stream crossings minimized
Soils beneath infiltration facilities not compacted during constructionContributing drainage area to be stabilized prior to conveying runoff to filtering or infiltration practices
Approved stormwater management concept plan
Status of other applicable local, state and federal permits
Construction stormwater discharge permitState/federal permit for stream and wetland impacts
Maintenance agreement(s) (w/ O&M plans)
Pre-development natural drainage pathways, soil characteristics, topography, and vegetative cover identified
Steep slopes (as locally defined) left in natural conditionOpen space and other natural areas preserved Buffers provided on intermittant streamsFloodplains for intermittant streams left in natural condition
i.
j.
k.
l. Cul-de-sac center is landscapedm. No sidewalks on cul-de-sacsn.
o.
p.
q. Driveway length minimized2.
a.
b.
c. Urban forestry, tree preservationd. Green roofs
3
a. Shared parking used b. Structured parking usedc.
d.
e. Compact car spaces providedf.
g.
Additional Comments:
Street width and ROW width are minimum allowedCul-de-sac alternatives selected (hammerhead, loop road)Cul-de-sac diameter is minimum allowed
Grass swales used in lieu of curb & gutterSidewalks on one side for low-traffic roadsShared driveways used if this minimizes IC
Site Layout Techniques for Infill/Redevelopment (component of local Smart Growth policies)
Setbacks and/or height restrictions reduced for efficient use of spaceTransit, pedestrian, and bicycle access & facilities
Parking Lot BSD & Smart Growth Techniques
Pervious parking for overflow and/or regular spaces (w/ optional stormwater storage below)
Minimum number of parking spaces provided
Parking lot designed to sheet flow to multiple pointsParking lot graded toward landscaped islands, perimeter landscaping, and/or bioretention
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Sheet Flow to Conservation Area - Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
Key QuestionsItem X Comments
1. Sheet flow drainage areaa. All perviousb. Includes impervious
2. Type of conservation areaa. Forestb. meadow/brushc. Other ________________________
3. Conservation area protects:a. Streamb. Lake or pondc. Other ________________________
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a. Limits of existing natural areab. Average slope of natural areac. Root zones for specimen treesd.
e. Location of fencing and signagef. Restoration plan, if applicable
If a conservation area is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Plan view depicts the boundaries of the conservation area relative to existing and proposed features. And includes the following:
Type, size, and condition of existing vegetation
2.
a. Pervious areas: max flow length ≤ 150’b. Impervious areas: max flow length ≤75’
3.
a. Flows are in sheet flowb.
4. Detailsa. Permanent fencing requirementb. Permanent signage
5.
a.
b.
c.
6.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Calculation of the amount of credit is shown
a.
2.
3. Design for engineered level spreader
a. Calculations for Tv peak dischargeb. Length of level spreader rigid lip
C. Construction SpecificationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
Plan view depicts the limits of the contributing drainage area:
Drainage map shows flow paths to the conservation area
Level spreaders provided at the end of outfalls or channels discharging to the conservation area
Erosion and Sediment control plan shows limit of disturbance, with no disturbance to occur in the conservation area
Sediment controls are located upstream of the natural area to be preserved
Temporary construction fencing protects natural areaTemporary construction signage at boundaries of natural areaLandscaping plan shows restoration planting specifications, if applicable
Area is not double counted with other credits
Conservation area meets requirements for size, slope, and existing condition
Specifications clearly state that no disturbance is to occur in the conservation area
2.
D. Permit Approval and DocumentationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
Additional Comments:
Sequence of construction indicates that the contributing drainage area must be stabilized before flows can be routed to conservation area
Conservation Easement in place that specifies conservation area to be maintained in natural condition
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Sheetflow to Vegetated Filter Strip - Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
Key QuestionsItem X Comments
1. Sheet flow drainage areaa. All pervious areab. Includes impervious areas
2. Filter Strip's existing conditiona. Forestb. Prairie/grasslandc. Other _________________________
3. Required Filter Strip width: ______________
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
3.
a. Pervious areas: max flow length ≤ 150’b. Impervious areas: max flow length ≤75’
4. Soils are delineateda. Design includes soil amendmentsb.
5. Detailsa. Level spreader (if applicable)
If sheet flow to a vegetated filter strip is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Plan view depicts the boundaries of the filter strip relative to proposed drainage featuresRunoff enters filter strip as sheet flow or has a level spreader
Plan view depicts the limits of the contributing drainage area:
Plan includes soil amendment quantity and incorporation depth
6.
a.
b.
7.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Calculation of the amount of credit is shown
C. Construction SpecificationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
D. Permit Approval and DocumentationS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Filter strip is in place and stabilized
Additional Comments:
Erosion and sediment control plan shows limit of disturbance
Sequence of construction shows filter strip being installed after contributing drainage area has been stabilized
Temporary or permanent protective matting or fabric to help establish vegetation
Landscaping plan provides stabilization specifications and notes
Sequence of construction indicates that the contributing drainage area must be stabilized before flows can be routed to the filter strip
Specifications clearly state that no disturbance is to occur in the buffer
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Impervious Area Disconnection Credit - Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
Key QuestionsItem X Comments
1. Type of impervious area disconnecteda. Rooftopb. Parkingc. Other
2.
Compensatory device type:a. Infiltrationb. Rainwater Harvestingc. Rain gardend. Other _________________________
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a.
b.
If impervious area disconnection is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Compensatory practice needed to help disperse flows from impervious area -- Include compensatory device if flow path through pervious area is less than 40 feet (or local standard); see separate checklist for particular practice
Plan sheet shows a receiving pervious area (e.g. vegetated channel, swale, grass strip) downgradient from the impervious area to be disconnected
For rooftop disconnection, the locations of the downspouts are shown; downspouts are not connected to the storm drain system
For surface impervious area disconnection, no barrier (e.g. curb) is present
c.
d.
e.
2.
a.
3. Detailsa. Level spreader (if applicable)b. Compensatory device (if applicable)
4. Landscaping plana.
b.
5.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Calculation of the amount of credit is shown
a.
2.
a.
b.
c.
The disconnection flow path through the pervious area receiving runoff is a delineated OR a compensatory device is shown
The average slope of the pervious area receiving runoff is ≤2% or ≤5 with turf reinforcement
The soil type of the pervious area receiving runoff is appropriate (A, B, or C) and is not highly erodible
Drainage map shows flow paths to the pervious area receiving runoff
Level spreaders provided at the end of outfalls or channels
Specifies maximum compaction for the receiving pervious areaSpecifies soil amendment and topsoil requirements if necessary
Erosion and sediment control plan shows flows from the impervious area diverted until pervious area is stabilized (possible exception for rooftop runoff if silt fence or other ESC measures are in place)
Area is not double-counted with other credits
Disconnected drainage area does not exceed the maximum
For rooftop disconnection, the rooftop impervious area to a single disconnection does not exceed 1,000 sq. ft.
For non-rooftop impervious area disconnection, the impervious drainage area longest flow path ≤ 75 ft. (e.g., sheet flow condition)
If compensatory practice is used in pervious area, device has adequate surface area and volume as per the individual practice specifications
C. Construction SpecificationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
Additional Comments:
Sequence of construction indicates that the pervious area must be stabilized before flows can be routed to the area
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Infiltration/Filtration/Bioretention Practice Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
E-mail: E-mail:
Key Questions Item X Comments
1. Type of facility (check all that apply)a. Bioretentionb. Water Quality Swalec. Urban Bioretentiond. Residential Rain Gardene. Infiltration Practicef. Filtration Practice
2. For Bioretentiona. Standard design (Level 1)b. Infiltration design (Level 2)c. Extended filtration design (Level 2)
3. Facility Locationa. Open to Surfaceb. Underground
4. Filtration Mediaa.b. Sandc. Bioretention Soil Mixd. Peate. Other
5. Hydraulic configurationa. On-line facilityb. Off-line facility
6. Type of pretreatment facilitya. Separatte pretreatment cellb. Sedimentation chamber/maholec. Grass channel
If an infiltration or filtration facility (including bioretention) is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
No filtration media (e.g., stone reservoir only)
d. Grass filter stripe. Gravel or stone flow spreaderf. Gravel diaphragmg. Other Type of pretreatment facility:
7. If designed for infiltration (e.g., no underdrain OR infiltration sump below underdrain):a.
b.
c. Field-measured rate:
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a.
b.
c.
d.
e.
2. Detail view of pretreatment facilitya. Inlet details, materials and elevationsb. Inlet protection (rip rap or other)c. Outlet details, materials and elevations
3. Cross-section view of treatment facilitya. Existing and proposed elevationsb.
c.
d.
4.
Evidence of hotspot runoff which may prevent infiltration; check use of liner for hotspot conditions.
Soil boring logs and infiltration testing report providedField-measured infiltration rate of 0.5 to 4 inches/hour
Facility contours shown in plan view on stormwater management and/or grading plan
Site slope does not exceed 3:1 (bioretention) or 4:1 (infiltration)
Flow length is maximized; no short-circuiting between inlet(s) and outlet
If off-line facility, flow diversion structure location & design shown (details, materials, elevations)
Facility meets building foundation setback requirements (see "Feasibility Criteria" for applicable specification)
Facility meets drinking water well setback requirements (typically 100')
Side slopes do not exceed 3:1 (bioretention) or 4:1 (infiltration)Plan shows depth and composition of underdrain, choker, and soil media layers; check Level 1 and 2 required depths
Ponding depth does not exceed maximum allowable (18" for bioretention)
Details for riser/outlet structure (if applicable)
a. Materialsb. Elevationsc.
d.
e.
f.
5. Observation well(s) provided (infiltration)6. Embankment/berm details and elevations7. Landscaping plan
a.
b.
8. Signagea.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
3.
4.
5.
Additional Comments:
For filtration practices: details, materials and elevations for underdrain system
For bioretention & filtration practices: Cleanouts provided for underdrain system
Principal spillway equipped with removable trash rackDetail for trash rack(s) includes material, dimensions, size of openings
Vegetation suited to the hydrologic regime
Landscaping plan contains required elements
Signage provided for high visibility projects
Facility sized according to relevant design criteriaPretreatment facility sized according to relevant design criteriaFacility designed to dewater within maximum allowable drawdown time (48 hours for infiltration and/or infiltration sump in underdrain)
Geotechnical report or other source indicates depth to groundwater and bedrock. Minimum separation distance of 2' between bottom of practice and seasonal high water or bedrock (bioretention and infiltration)
Analysis of stable conveyance downstream from practice
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Permeable Pavement Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
E-mail: E-mail:
Key QuestionsItem X Comments
1. Type of facility (check all that apply)a. Standard design (Level 1)b. Infiltration design (Level 2)c. Infiltration sump design (Level 2)
2. Pavement Typea. Pervious concreteb. Porous asphaltc. Concrete grid paversd. Permeable interlocking concrete paverse. Other:
3. External drainage area?a. Yes. Ratio:b. No
4. Pretreatment (if landscaped/turf areas in drainage area)a. Yes. Type:b. No
5. If designed for infiltration (e.g., no underdrain OR infiltration sump below underdrain):a.
b.
c. Field-measured rate:
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
If permeable pavement is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Evidence of hotspot runoff which may prevent infiltration; check use of liner for hotspot conditions.
Soil boring logs and infiltration testing report providedField-measured infiltration rate > 0.5 inches/hour
Item S U N/A Comments1.
a.
b.
c.
d.
2. Detail view of pretreatment facility (if applicable)a. Inlet details, materials and elevationsb. Inlet protection (rip rap or other)c. Outlet details, materials and elevations
3. Cross-section view of permeable pavementa. Existing and proposed elevationsb.
4. Observation well(s) provided (infiltration)5. Signage
a.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
3.
4.
5.
Facility contours shown in plan view on stormwater management and/or grading plan
Pavement section bottom slope is flat (infiltration) or almost flat (0.5% if using underdrain)
External drainage area (if present) is delineatedFacility meets building foundation setback requirements (see "Feasibility Criteria" for applicable specification)
Facility meets drinking water well setback requirements (typically 100')
Plan shows depth and composition of filter layer, reservoir layer (with or without underdrain and/or infiltration sump), pavement
Signage provided for high visibility projects
Facility sized according to relevant design criteriaDesign accounts for anticipated structural load Facility designed to dewater within maximum allowable drawdown time (48 hours for infiltration and/or infiltration sump in underdrain)
Geotechnical report or other source indicates depth to groundwater and bedrock. Minimum separation distance of 2' between bottom of practice and seasonal high water or bedrock
Analysis of stable conveyance downstream from practice for large flows
Additional Comments:
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Grass Swale Credit - Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
Email: Email:
Key QuestionsItem X Comments
1. Grass Swale Designa. Grass swale (use this checklist)b.
c. Other
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2. Runoff enters the swalea. Sheet flow along the lengthb.
c. Channel bottom width is 2 to 8 ftc. Side slopes are 3:1 or flatterd.
e.
2.
3. Detailsa. Channel cross section & profileb.
If a grass swale is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Water Quality Swale (use Bioretention checklist)
Grass swale locations are marked on the plan sheet
Concentrated flow through curb cuts or pipes
Channel longitudinal slopes are 2% or lessChannel longitudinal slope is steeper than 2% with check dams
Drainage map shows flow paths to the grass swale
Erosion control blanket or turf reinforcement mat (if applicable)
4. Landscaping plana. Seed specificationsb.
5.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Calculation of the amount of credit is shown
2. Peak discharge calculations for the Tv3.4. Tv depth is ≤ 4 inches 5. Swale 2-year velocity is non-erosive 6.
7. Swale 2-year velocity is non-erosive
C. Construction SpecificationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
Additional Comments:
Topsoil or soil amendment specificationsErosion and sediment control plan shows
flows diverted around the swale until the swale & contributing drainage area are stabilized
Tv velocity is ≤ 1 ft/s
10-year flow is within the swale with adequate freeboard
Sequence of construction indicates that the grass swale must be stabilized before flows are routed to them
Project Name: Location:
File Number:Date of Submittal:
Reviewer:Date:
Rainwater Harvesting Practice Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
E-mail: E-mail:
Key Questions Item X Comments
1. Location of storage tank (check all that apply)a. Undergroundb. Above-groundc. Indoorsd. On rooftope. Other
2. Uses of rainwater (check all that apply)a. Potable Use:b. Non-Potable Use:
3. Secondary runoff reduction practice (if applicable)a. Bioretentionb. Infiltrationc. Grass Swaled. Stormwater Wetlande. Permeable Pavementf. Other Type:
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1. Plan view of stormwater management plan
a. Shows footprint location of cisternb. Shows conveyance system to cisternc. Adequate setbacks from utilitiesd. Shows outlet point(s)
If a rainwater harvesting facility is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
2.
a.
b.
c.
d.
3. Profile view of rainwater systema.
b.
c.
4.
a. Specificationsb. Elevationsc. Protections against freezing in place
5.
6.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2. Year-round use verified3. Drawdown volume computed (if applicable)4. Adequate hydraulic head where necessary
5.
6.
7. Sizing of secondary practice (if applicable)8.
Additional Comments:
Detail view of conveyance, pretreatment, and cistern
Location of inlet, outlet, air gap,pump, etc.Filter sizing appropriate for drainage area - minimum 95% filter efficiency
Screening over open ports to keep out pestsMaterials for cistern, includes access for maintenance
Existing elevations/contours and proposed inverts of system components shown
At least 1.5% slope from downspouts to cisternAdequate slope from cistern to outfall of overflow
Details for pumping/distribution system, including additional filtration
Details for outlet protection and/or secondary practiceRainwater system design and components comply with local codes
Cistern Design Spreadsheet completed and runoff reduction credit calculated.
Only rooftop in contributing drainage area, unless approved by locality
For underground system, vehicle loading limits shown on plan - signage in place if no loading allowed.
Analysis of stable conveyance downstream from practice
Project Name:
Location:
File Number:
Date of Submittal:
Reviewer:
Date:
Vegetated Roof Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
E-mail: E-mail:
Key QuestionsItem X Comments
1. Type of vegetated roof (check all that apply)a. Extensive - shallow soilb. Intensive - deep soilc. Other Type:
2. Type of plant cover (check all that apply)a. Sedumsb. Shrubsc. Treesd. Other Type:
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a. Location of drainsb.
c.
d.
2.
If a vegetated roof is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Footprint of vegetated roof shown in plan view on stormwater management and building plan
Flow paths from drainage layer to roof drain shownLocations of roof access, and walkways for maintenance2-foot vegetation-free zone around perimeter (recommended)
Profile view shows pitch of roof - some pitch required for drainage, but maximum 25% pitch
3.
a. Appropriate roof decking material Type:b. Type:
c. Insulation layer (if applicable)d. Root barrier Type:e. Type & Depth:
f. Filter fabric - needled, non-woveng. Minimum 4" of growing media Depth:
4. Details for growing mediaa. Organic matter content not above 20%b.
c.
5. Details for roof drainsa.
b.
c.
6. Landscaping plana.
b.
7.
8.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
2.
3.
Cross-sectional view of vegetated roof with all layers
Appropriate waterproofing layer material
Drainage layer - synthetic or inorganic material
Maximum water holding capacity of 30%If trees present, depth of growing media at least 4 ft.
Flashing 3" above soil surface around drains located adjacent to growing media
Adequate number of roof drains NOT adjacent to growing mediaDrainage layer adequate enough to convey water to downspouts without excessive ponding on roof.
Plant types that can survive harsh conditions, appropriate to relevant hardiness zone
Number and species of plants listed on plan.
Design and setbacks in conformance with local building codesDesigns in conformance with ASTM International Vegetative (Green) Roof Standards.
Structural capacity conforms to ASTM E-2397 guidelines or other approved method
WV Site Design Spreadsheet completed to show amount of credit
Vegetated roof "sized" to manage the 1" rainfall
Additional Comments:
Project Name: Location:
File Number:Date of Submittal:
Reviewer:Date:
Stormwater Wetland Plan Review Checklist
Applicant: Applicant's Representative:
Contact Name: Contact Name:
Phone Number: Phone Number:
E-mail: E-mail:
Key QuestionsItem X Comments
1. Type of stormwater wetland (check all that apply)a. Stormwater wetland basin (Level 1)b.
c.
d. Other Type:
2. Type of pretreatment facility (check all that apply) Pretreatment must be provideda. Sediment forebayb. Other Type:
3.
4.
a.
A. Project PlansS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a.
If a stormwater wetland is included in the project plans, the stormwater management design plan shall be reviewed according to the additional criteria provided below.
Stormwater multi-cell wetland or pond/wetland combination (Level 2)Subsurface gravel wetland (Modified Level 2)
Temperature-sensitive waters located downstream of wetland
Soil boring logs and geotechnical report provided
Evidence that a pond liner is required due to underlying geology (e.g. karst topography, sand)
Stormwater Wetland contours shown in plan view on stormwater management and/or grading plan
Length-to-width ratio and/or flow path ratio is at least 2:1 for Level 1 designs or 3:1 for Level 2 designs
b.
c. Curvilinear shoresd.
e.
f.
g.
2.a.
b.
c.
3. Detail view of pretreatment facilitya. Inlet details, materials and elevationsb. Inlet protection (rip rap or other)c.
4. Details for riser/outlet structurea. Materialsb. Elevationsc.
d.
e.
f.
g. Structural details for concrete risersh.
i.
5. Details for barrel (outlet pipe)a. Barrel materials, elevations, dimensions
b.
c. Joint sealant specifications
Flow length is maximized. Berms or baffles provided to lengthen flow path if necessary
4' - 6' wide aquatic bench provided around forebays & micropoolsFor Level 2: Microtopography in pond results in varied water depths For Level 2: Multiple cells with mean depth less than 1 foot Emergency spillway located in excavated area, not in fill
Profile view of pretreatment facility and stormwater wetland with existing and Profile location is marked on
plan viewWater surface/ponding elevations for design stormsCore trench, anti-seep collars, riser, low-flow orifice, barrel shown
Outlet details, materials and elevations
Riser/outlet structure located within embankmentPrincipal spillway equipped with removable trash rackDetail for trash rack(s) includes material, dimensions, size of openingsCleanouts provided for pond drain system
Low flow orifice provided and meets or exceeds minimum orifice size (3 in. or local standard)
Low flow orifice adequately protected from clogging (e.g. reverse slope pipe, trash rack)
Anti-seep collar details (if applicable) includes dimensions, material, reinforcement
d.
e.
f. Outlet protection (rip rap or other)6. Embankment/berm details and elevations
a.
b.
c.
7. Landscaping plana.
b.
B. Design ComputationsS = Satisfactory U = Unsatisfactory N/A = Not Applicable
Item S U N/A Comments1.
a.
b.
c.
2.a. Maximum of 4' depth in forebay(s)b.
c.
d.
3.
Barrel outfall details, materials and elevationsEmergency overflow structure/spillway details, materials and elevations
Embankment/berm slopes do not exceed maximum allowable (max. allowable slope: __________ )
Embankment/berm top width meets or exceeds minimum allowable (min. allowable top width: ____________ )
Allowable soils specified for embankment and core trench
No woody vegetation on embankments constructed of fill material Vegetation suited to the normal pool water depths
Wetland permanent pool and available storage volume sized according to WV Stormwater Manual
For Level 2: Design Volume of wetland is 1.5 x Treatment VolumeFor Level 2: Wetland surface area greater than 3% of contributing drainage area.
Hunt Water Balance equation performed to size minimum depth of permanent pool
Pretreatment facility sized and designed according to WV Stormwater Manual
Depth transitions to 1' at entrance to wetland cellSize of forebay(s) is proportional to total inflow to wetlandForebay includes metered rod for monitoring sediment accumulation
Drain system capable of draining wetland pool within acceptable drawdown time
4.
Additional Comments:
Difference between high water level (detention storage) and normal water level does not exceed 12"
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