Proposed Virginia Stormwater Management Regulations

1
Proposed Virginia Stormwater Management
Regulations
2
Agenda

• State Stormwater Regulation Changes
• Schedule and Process for Final Changes
• Project Examples
• Locality Impacts

3
Significant Stormwater Regulation Changes

• Part I Definitions
• Part II More Restrictive Technical Criteria
• Water Quality
• BMPs
• Water Quantity
• Detention
• Part III Locality Delegation
• Submission, Review and Approval of Plans
• Long Term BMP Inspection Reporting to DCR
• Part XIII Increased Permit Fees
• Individual/general permits Fees
• Transfer of Permits Fees
• Annual Permit Maintenance Fees
• BMP Clearinghouse and Blue Book

4
Stormwater Management RegulationsTechnical
Criteria (Part II)
Water Quality Changes

• Current Regulations
• Total phosphorous removal
• Removal rate typically 0.45 lbs/acre/year
• 10 reduction for redevelopment
• Nutrient loads based on impervious cover

• Draft Regulations
• TP still required, also need to calculate Total
  Nitrogen
• Removal rate 0.28 lbs/acre/year
• 20 reduction for redevelopment
• Nutrient loads based on impervious cover and
  managed turf

Managed turf land disturbed and graded and
intended to be mowed for turf including yards,
right-of-way, commercial uses, athletic fields
and institutional uses
5
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Water Quality Changes
• Localities may apply criteria to each drainage
  area rather than project site
• If land disturbance occurs on a portion of a
  site, locality may apply criteria to that portion
  rather than project site
• Criteria must be applied independently within
  each HUC
• Off-site controls may be used if allowed by
  locality
• Development must use the Runoff Reduction Method
  to achieve water quality results

6
Stormwater Management RegulationsTechnical
Criteria (Part II)

• BMP Changes
• BMPs will be approved through BMP Clearinghouse
  and Blue Book
• BMP efficiencies will be set in Runoff Reduction
  Spreadsheet
• Removal based on 1 inch of rainfall over treated
  area
• BMP Designs have 2 levels
• Level 1 standard design
• Level 2 enhanced design to increase efficiency

7
Stormwater Management RegulationsTechnical
Criteria (Part II)
BMP Changes

• Approved BMPs
• Green Roof
• Rooftop Disconnection
• Rain Tanks/Cisterns
• Soil Amendments
• Permeable Pavement
• Grass Channel
• Bioretention

• Infiltration
• Dry Swale
• Wet Swale (Coastal Plain)
• Sheet Flow to Open Space
• Extended Detention
• Filtering Practice
• Constructed Wetland
• Wet Pond

Standards and specifications provided in BMP
Clearinghouse
8
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Stormwater Nonpoint Nutrient Offsets
• HB 2168
• Effective July 2009
• Applied to Chesapeake Bay watershed tributaries
• Can be used to meet water quality requirements
  only
• Must be consistent with local MS4 plan and TMDLs

9
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Water Quantity Changes
• Channel Protection
• Manmade conveyance system no erosion from 2-year
  24-hour storm
• Restored natural conveyance system can not
  exceed design capacity of the channel or result
  in instability
• Stable natural conveyance system
• QdevelopedRVdevelopedltQpre-developedRVpre-develo
  ped
• Unstable natural conveyance system
• QdevelopedRVdevelopedltQforestedRVforested
• Qdevelopedallowable peak flow from developed
  site
• Qpre-developedpeak flow from pre-developed site
• Qforestedpeak flow from site in forested
  condition
• RVdevelopedvolume of runoff from developed site
• RVpre-developedvolume of runoff from
  pre-developed site
• RVforestedvolume of runoff from site in forested
  condition

10
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Water Quantity Changes
• Flood Protection
• Manmade conveyance system confine 10-year
  24-hour storm
• Restored natural conveyance system confine
  10-year 24-hour storm
• Natural conveyance system that does not flood
  confine 10-year 24-hour storm
• Natural conveyance system that does flood peak
  flow rate from post-developed 10-year 24-hour
  storm not to exceed peak flow rate from
  pre-developed 10-year 24-hour storm based on
  forested conditions

11
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Water Quantity Changes
• One Percent Rule
• Channel Protection and Flood Protection do not
  apply if
• Sites drainage area is lt 1.0 of total
  contributing drainage area
• Or
• Peak flow rate from one-year 24-hour storm for
  post-development site conditions (prior to
  quantity control) is less than 1.0 of the
  existing one-year 24-hour storm for the total
  watershed area

12
Stormwater Management RegulationsTechnical
Criteria (Part II)

• Water Quantity Changes
• All pre-development runoff from prior developed
  sites shall be assumed in good hydrologic
  condition
• TR-55 and TR-20 used for analysis
• Localities may allow Rational or Modified
  Rational
• Stormwater harvesting is encouraged

13
Stormwater Management RegulationsPermit
Application Fees (Part XIII)

• CBPA 2,500 Sq.Ft. 0.5 acre 290
• CBPA 0.5 acre 1 acre 1,500
• 1.0 acre 5.0 acres 2,700
• 5.0 acres 10 acres 3,400
• 10 acres 50 acres 4,500
• 50 acres 100 acres 6,100
• 100 acres 9,600
• Individual Permit 15,000

14
Stormwater Management RegulationsPermit
Modification or Transfer Fees

• CBPA 2,500 Sq.Ft. 0.5 acre 20
• CBPA 0.5 acre 1 acre 100
• 1.0 acre 5.0 acres 200
• 5.0 acres 10 acres 250
• 10 acres 50 acres 300
• 50 acres 100 acres 450
• 100 acres 700
• Individual Permit 5,000

15
Stormwater Management RegulationsAnnual Permit
Maintenance Fees

• CBPA 2,500 Sq.Ft. 0.5 acre 50
• CBPA 0.5 acre 1 acre 200
• 1.0 acre 5.0 acres 400
• 5.0 acres 10 acres 500
• 10 acres 50 acres 650
• 50 acres 100 acres 900
• 100 acres 1,400
• Individual Permit 3,000

16
Stormwater Regulations Schedule

• June 22 August 21 2009 60-day public comment
• August - September 2009 DCR revisions after
  public comment
• October 2009 Virginia Soil and Water
  Conservation Board approval
• December 2009 Final regulation published
• July 2010 Final regulation effective
• October 2011 Localities implement stormwater
• - April 2012 programs

17
Agenda

• State Stormwater Regulation Changes
• Schedule and Process for Final Changes
• Project Examples
• Locality Impacts

18
Example 1 Site Layout with Current Regulations
134 ac Site Mixed Use
19
Example 1 Site Layout with Proposed Regulations
134 ac Site Mixed Use
20
Example 1 Summary

• Current Regulations
• Required Removal
• 167.0 lbs/yr
• Method of Removal
• 3.30 ac. Wet Pond 1
• Number of BMPs
• 2
• Stormwater Cost
• 1,000,000
• 5,988/lb
• Total Cost 1,000,000

• Proposed Regulations
• Required Removal
• 200.5 lbs/yr
• Method of Removal
• 1.95 ac. Bioretention 1
• 1.50 ac. Bioretention 2
• 4.55 ac. Wet Pond 2
• 1.0 ac. Pervious Pavement
• Number of BMPs
• 28
• Stormwater Cost
• 3,801,980
• 18,962/lb
• Lost Acreage
• 1.62 Ac. _at_ 500,000/ac.
• 810,000
• Total Cost 4,611,980

21
Example 2 Site Layout with Current Regulations
33.00 ac. Site Commercial/Retail
22
Example 2 Site Layout with Proposed Regulations
33.00 ac. Site Commercial/Retail
23
Example 2 Summary

• Current Regulations
• Required Removal
• 36.54 lbs/yr
• Method of Removal
• Underground StormFilter System
• Number of BMPs
• 2
• Stormwater Cost
• 650,000
• 17,789/lb
• Total Cost 650,000

• Proposed Regulations
• Required Removal
• 45.58 lbs/yr
• Method of Removal
• 0.46 ac. Pervious Pavement
• 0.36 ac. Bioretention 1
• 1.60 ac. Wet Pond 2
• Number of BMPs
• 14
• Stormwater Cost
• 780,319
• 17,120/lb
• Lost Acreage
• 1.64 ac. _at_ 500,000/ac.
• 820,000
• Total Cost 1,600,319

24
Example 3 Site Layout with Current Regulations
43.00 ac. Site Commercial/Retail
25
Example 3 Site Layout with Proposed Regulations
43.00 ac. Site Commercial/Retail
26
Example 3 Summary

• Current Regulations
• Required Removal
• 57.18 lbs/yr
• Method of Removal
• Paid into Local Program Fund
• Number of BMPs
• Zero
• Stormwater Cost
• 349,084
• 6,105/lb
• Total Cost 349,084

• Proposed Regulations
• Required Removal
• 67.26 lbs/yr
• Method of Removal
• 1.51 ac. Bioretention 1
• 2.16 ac. Wet Pond 2
• Number of BMPs
• 29
• Stormwater Cost
• 1,276,880
• 18,984/lb
• Lost Acreage
• 1.51 ac. _at_ 500,000/ac.
• 755,000
• Total Cost 2,031,880

27
Example 4 Site Layout with Current Regulations
0.92 ac Site Urban Redevelopment
28
Example 4 Site Layout with Proposed Regulations
0.92 ac Site Urban Redevelopment
29
Example 4 Summary

• Current Regulations
• Required Removal
• 0.20 lbs/yr
• Method of Removal
• Permeable Pavement
• Number of BMPs
• 1
• Stormwater Cost
• 80,150
• 400,752/lb
• Total Cost 80,150

• Proposed Regulations
• Required Removal
• 0.40 lbs/yr
• Method of Removal
• Permeable Pavement
• Green Roof
• Number of BMPs
• 2
• Stormwater Cost
• 280,526
• 701,315/lb
• Total Cost 280,526

30
Example 5 Site Layout with Current Regulations
39.16 ac Site Residential
31
Example 5 Site Layout with Proposed Regulations
39.16 ac Site Residential
32
Example 5 Summary

• Current Regulations
• Required Removal
• 4.88 lbs/yr
• Method of Removal
• Bioretention
• Filterras
• Extended Detention
• Number of BMPs
• 7
• Stormwater Cost
• 157,183
• 32,209/lb
• Total Cost 157,183

• Proposed Regulations
• Required Removal
• 22.94 lbs/yr
• Method of Removal
• Permeable Pavement
• Bioretention
• Dry Swale
• Number of BMPs
• 20
• Stormwater Cost
• 1,674,882
• 73,011/lb
• Total Cost 1,674,882

33
Reference Information

• Latest Version of Parts I, II, and III Draft
  Regulations
• http//www.dcr.virginia.gov/lr2c.shtml
• Latest Version of Parts I, II, and III Draft
  Regulations
• http//www.dcr.virginia.gov/lr2b.shtml
• Economic Impact Analysis
• http//www.dcr.virginia.gov/lr2b.shtml
• Runoff Reduction Method
• http//www.dcr.virginia.gov/lr2f.shtml
• BMP Clearinghouse
• http//www.vwrrc.vt.edu/swc/

34
Agenda

• State Stormwater Regulation Changes
• Schedule and Process for Final Changes
• Project Examples
• Locality Impacts