SCOPE. UNIFIED STORMWATER ORDINANCE Flood Damage Prevention Stormwater Pollution Control Unified Development Code Others DESIGN CRITERIA MANUAL

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2 UNIFIED STORMWATER ORDINANCE Flood Damage Prevention Stormwater Pollution Control Unified Development Code Others DESIGN CRITERIA MANUAL Water Utilities Transportation Stormwater Parks Fire SCOPE

3 Subdivision Regulations Original Adoption 1987 Repealed, overhauled and readopted 2003 Design Criteria Manual Created 2003 Citizens Policy Review Committee Report Draft Comprehensive Stormwater Management Plan Quick Fixes Lake Arlington Master Plan Thoroughfare Plan Unified Development Code Comprehensive Plan HISTORY

4 COMPREHENSIVE PLAN

5 PROTECT OUR RESOURCES Strategies and Actions Implement the Lake Arlington Master Plan Development and implement a citywide natural resources management plan Acquire, protect and preserve lands with significant natural and cultural resources Continue to include stormwater management best practices for new or existing developments Preserve floodplain areas as well as wetlands a stream buffers Implement Low Impact Development (LID) strategies and landscaping initiatives to manage stormwater impacts. WHY?

6 WHY?

7 WHY?

8 WHY?

9 FLOODING WHY?

10 EROSION WHY?

11 WATER QUALITY WHY?

12 UNIFIED STORMWATER ORDINANCE Performance Standards (Requirements) Example Ordinance Statement: The 25-year design storm shall be used as a minimum for the design of inlets and storm drain. DESIGN CRITERIA MANUAL Guidance Example Manual Provision: Acceptable calculation methods to determine 25-year event and size inlets appropriately. DOCUMENT RELATIONSHIP

13 Benchmarking 8 Regional Communities 4 State Communities 2 National Communities iswm (integrated Stormwater Management) NCTCOG Regional Standard New Tiered Implementation Going for the Gold! STANDARDS COMPARISON

14 External Committee Developers Consultants School Districts Colleges P&Z Representative Professional Associations Commercial Lenders Internal Committee Public Works Water Utilities Parks Community Dev/Planning Fire Economic Development City Attorneys Office ADVISORY COMMITTEES

15 Date April 2013 May June 13 August 2013 September 2013 March 2014 June 2014 May June 2014 January 2015 February 2015 Meeting Internal Kickoff Internal and External Advisory Committee Surveys Internal Focus Groups and General Organization Meeting External Advisory Committee Kickoff Internal Department Focus Groups and Draft Review External Advisory Committee Meeting (non-stormwater DCM Chapters) Stormwater Coordination Meetings with One-Start Engineers USO Internal Advisory Committee USO External Advisory Committee ADVISORY COMMITTEE MEETINGS/COORDINATION

16 Article I: General Provisions Article II: Administration Article III: Municipal Stormwater Utility System Article IV: Stormwater Permits Article V: Stormwater Pollution Prevention (during construction) Article VI: Special Management Areas Article VII: Non-Stormwater (Illicit) Discharges Article VIII: Stormwater Discharges Associated with Industrial Activities Article IX: Reconsideration, Variances and Appeals Article X: Enforcement Remedies Articles XI XV: Miscellaneous Standard Ordinance Provisions ORDINANCE ORGANIZATION

17 Preservation of Natural Resources Minimization of Impervious Surfaces Most Desirable Natural Preservation of Natural Infiltration and Storage Use of vegetated channels Structural Measures - Water Quality and Quantity Control Structural Measures - Water Quantity Control Only Structural Measures - Water Quality Control Only Least Desirable Structural STORMWATER HIERARCHY

18 Stormwater Permit Floodplain Management Drainage Impact Analysis Water Quality Best Management Practices MAJOR CHANGES

19 Typically Required Conditionally Required Drainage Report Stormwater Quality Plan Stormwater Pollution Prevention Plan (SWPPP) Operations and Maintenance Plan Flood Study Construction Plans Floodplain Development Permit FEMA Requirements (CLOMR Pre- Construction; LOMR Post-Project) USACE Permit Impacted Waters of U.S. CDC Permit USACE Regulatory Zone/Trinity River STORMWATER PERMIT

20 100-year floodplain dedication + Erosion Clear Zone More restrictive erosion clear zone 1.5 to 1 Compensatory Storage FLOODPLAIN MANAGEMENT

21 EROSION CLEAR ZONE

22 Erosion Clear Zone 25-year Floodplain 100-year Floodplain EROSION CLEAR ZONE

23 Erosion Clear Zone 25-year Floodplain 100-year Floodplain EROSION CLEAR ZONE

24 Evaluation to show no adverse impact: No new or increased flooding of habitable structures. No increases in upstream or downstream water surface elevations greater than 0.04 unless contained in easement or right-of-way. No increase in channel velocities by more than 5% No increased discharges that will exceed capacity of downstream drainage system DRAINAGE IMPACT ANALYSIS

25 Permanent Water Quality Features for City Projects Post-Construction Water Quality Treatment based on Total Suspended Solids (TSS) Removal Inspections and Maintenance Requirements WATER QUALITY BEST MANAGEMENT PRACTICES

26 LOW IMPACT DEVELOPMENT (LID)

27 LOW IMPACT DEVELOPMENT (LID)

28 LOW IMPACT DEVELOPMENT (LID)

29 How much does all of this cost? It depends How large is the site? How much of the site is being disturbed? What is being built on the site? What methods are they using to handle their stormwater? STAKEHOLDER COMMENTS

30 Project Type Conventional Cost LID Cost Cost Difference Percent Difference 2 nd Avenue SEA Street, Seattle Auburn Hills, Wisconsin Bellingham City Hall, Washington Bellingham Bloedel Donovan Park, Washington Gap Creek, Arkansas Garden Valley, Washington Roadway (660 feet) $868,803 $651,548 $217,255 25% Subdivision $2,360,385 $1,598,989 $761,396 32% Parking Lot Retrofit $27,600 $5,600 $22,000 80% Park $52,800 $12,800 $40,000 76% Subdivision $4,620,600 $3,942,100 $678,500 15% Subdivision (9.7 acres) $324,400 $260,700 $63,700 20% EPA CASE STUDIES

31 Project Type Conventional Cost LID Cost Cost Difference Percent Difference Kensington Estates, Washington Laurel Springs, Wisconsin Mill Creek, Illinois Prairie Glen, Wisconsin Subdivision (24 acres) $765,700 $1,502,900 -$737,200-96% Subdivision $1,654,021 $1,149,552 $504,469 30% Subdivision (1,500 ac) Somerset, Maryland Subdivision (80 acres) Telltabs Corporate Campus $12,510 Per Lot $9,099 Per Lot $3,411 Per Lot 27% Subdivision $1,044,848 $599,536 $405,312 40% Commercial (55 acres) $2,456,843 $1,671,461 $785,382 32% $3,162,160 2,700,650 $461,510 15% EPA CASE STUDIES

32 Project Type Savings Team 1 Savings Team 2 Savings Team 3 Cedars West Mixed Use Development 26% 12% South Lamar Industrial Street Roadway 0% 8% 8% Arlington Library North Crossing West Urban Redevelopment Mixed Use Development 20% 5% 6% $1,000,000 LID COMPETITION COMPARISONS

33 DESIGN CRITERIA MANUAL Chapter Status Chapter 1 Administration 90% Complete Chapter 2 Right-of-Way & Easements 90% Complete Chapter 3 Water Utilities 80% Complete Chapter 4 Fire Merged with other chapters Chapter 5 Transportation 90% Complete Chapter 6 Stormwater In the works Chapter 7 - Parks 90% Complete UNIFIED STORMWATER ORDINANCE 75% Complete TASKS/ CURRENT STATUS

34 1. Design Criteria Manual Draft (Stormwater Chapter) 2. Internal Advisory Committee Review 3. External Advisory Committee Review 4. Final Draft of Manual and Ordinance 5. Council Consideration 6. Address Council Comments 7. Council Adoption 8. Implementation NEXT STEPS

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