Joel Tillery, P.E., CH2M HILL. SESWA 2010 Annual Conference October 7, 2010
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1 Joel Tillery, P.E., CH2M HILL SESWA 2010 Annual Conference October 7, 2010
2 The need for water quality improvement is a reason to play the game. Local governments dealt a variety of federal, state, and local regulations. What drives local governments to implement watershed improvement projects? What projects have been implemented and how much did we win?
3 Just a few of the challenges Increased stormwater runoff from land use change Addressing over 1,500 miles of rivers and stream in the Metro District that fail to meet water quality standards, primarily due to the effects of stormwater runoff and nonpoint source pollution Protecting aquatic health and habitat Source: MNGWPD Watershed Management Plan (2009)
4 Source: MNGWPD Watershed Management Plan (2009)
5 How we got here In the early 1990s, many surface waters were not meeting designated uses. Sierra Club and others filed suit against USEPA citing failure to implement specific provisions of the Clean Water Act in Georgia. Judge Shoob ruling in 1996 and 1997 required EPA to establish TMDLs for all water bodies not meeting designated uses. Schedule established for developing TMDLs for Georgia waterbodies.
6 In response to the ruling, EPD now requires withdrawal/discharge permit seekers to follow a three step process.
7 Local Management Measures in District Wide Watershed Management Plan
8 District Wide Watershed Management Plan (2003) The 2003 District Plan defined substantially impacted watershed with effective impervious area of greater than 10 percent. Local governments within these watersheds were required to develop Watershed Improvement Plans (WIPs) Projects identified in WIPs to be implemented over next 30 years. Schedule for Implementation Inventory Priority Watersheds Develop Restoration Alternatives and Watershed Improvements for Priority Watersheds Implement watershed improvement plan projects.
9 Section 5.H.2 TMDL Management Evaluate existing impaired waters Investigate potential pollutant sources Participate in TMDL implementation plan process Determine impaired waters from 303(d) list and review existing TMDLs and TMDL implementation plans. Develop a monitoring plan for 303(d) listed waters as required under existing permits and current TMDL implementation plans Participate in the TMDL implementation plan preparation and revision process. Section 5.H.4 Watershed Improvement Projects Identify substantially-impacted watersheds Prioritize watersheds Develop a local schedule Prepare WIP plans Based on local criteria and impaired streams identify substantially impacted watersheds. Prioritize watersheds or retrofit and restoration alternatives. Develop a local schedule that provides for public review by Design and prepare improvement projects.
10 District Wide Watershed Management Plans with enforcement by EPD. Conduct WIPs for substantially impacted watersheds. Incorporate watershed improvement projects into overall community CIP and implement as funding is available. Others: Phase I MS4 program implementation and assessment of the effectiveness of BMPs to address TMDL listed waters Phase II MS4 program taking steps to reduce pollutant in impaired waters TMDL program participate with TMDL implementation
11 1. Recognition of the value of watershed improvement for serving the public and treating streams as an amenity to the community 2. Creating opportunities for recreation in the form of greenways and nature preserves 3. Protection of infrastructure 4. Flood protection 5. Available funding in the form of stormwater utility dollars, 319(h) grants, SPLOST, USACE 206 program, and general funds
12 Metro District encompasses 15 counties and over 90 cities. Many are implementing projects, but those highlighted here include: Gwinnett County Department of Water Resources Clayton County Water Authority Forsyth County City of Atlanta City of Gainesville All have completed WA, WPP, and WIPs to identify stressors in substantially impacted watersheds and identify restoration activities.
13 Cashing in on Water Quality Improvement $$$$
14 Stream Stabilization Stream Restoration Stormwater Wetlands Detention Pond Retrofits Regional Detention Facilities Low Impact Development Infiltration based BMPs (bioretention, bioswale, rain gardens, green roofs, etc.)
15 What is stream stabilization? Use of hard armoring or soil bioengineering on channel bank to stop erosion. Where is it used? Stream stabilization used to address localized problems and protect infrastructure. What pollutants are addressed? Improves water quality by reducing sediment delivery to stream channels but may have limited benefit on restoring habitat. Project Example Intrenchment Creek City of Atlanta
16 Intrenchment Creek Stabilization Stream highly impacted by urbanization and historical combined sewer overflow events. Extreme bank erosion impacting roadway used for access to City of Atlanta police facility. Stream also at base of closed landfill. Combination of gabion baskets, soil bioengineering, and instream structures used to stabilize app. 500 feet of creek. Project completed 03/09 Funded by City of Atlanta Public Works Department and Police City of Atlanta
17 Intrenchment Creek Stabilization Project Benefits Stopped bank erosion Protected roadway Protected landfill Potential to improve water quality through reduced sedimentation
18 What is stream restoration? An attempt to return a stream to a more pristine condition with improved water quality and habitat to support an abundant and diverse aquatic ecosystem. What does stream restoration accomplish? Reduced stream bank erosion Improves sediment transport and reduced sedimentation Improved dissolved oxygen Increased habitat availability What pollutants are addressed? Primarily sediment Other pollutants bound in sediment (metals, nutrients, bacteria) Projects Examples McDaniel Farm Gwinnett County Allenhurst Drive Gwinnett County Camp Creek - Clayton County Midway Park Forsyth County
19 Sweetwater Creek Tributary Restoration at McDaniel Farm Park Stream impacted by urbanization, active downcutting, and bank erosion. Restored approximately 1,800 feet of stream using natural channel design techniques. Priority 1 and 2 restoration of a G channel to a B and C channel Constructed j-hook vanes, cross vanes, step-pools, and soil bioengineering. Riparian buffer restoration and enhancement completed including invasive removal and revegetation. Project completed 01/06 Funded by Georgia DOT Gwinnett County DWR
20 Sweetwater Creek Tributary Restoration at McDaniel Farm Park Project Benefits Reduced bank erosion Improved habitat Managed invasive species Buffer restored Provided mitigation for GDOT I85 / SR316 Interchange Project Low impact trails and pedestrian trails enhanced park
21 Allenhurst Drive Stream Restoration Stream impacted by urbanization and bank erosion Project identified in WIP and through service requests. Restored approximately 700 feet of channel using natural channel design techniques. Stabilized severely eroded banks with geotextile and soil bioengineering. Stabilized eroding drainage ditch with step-pool structures. Project completed 03/09 Funded by stormwater utility Gwinnett County DWR
22 Allenhurst Drive Stream Restoration Project Benefits Reduced bank erosion Improved habitat Addressed property loss Promoted public awareness and advocacy for County watershed improvement program
23 Camp Creek Stream Restoration Stream destabilized through historical agricultural practices and channel downcutting Stream further impacted by urbanization Severe bank erosion and sedimentation prevalent Restored 3,000 feet of channel using natural channel design techniques Project completed 12/08 Funded by 319(h) grant and stormwater utility Clayton County Water Authority
24 Camp Creek Stream Restoration Project Benefits Reduced bank erosion Reduced sedimentation Improved habitat Managed invasive species Restored riparian buffers Improved fish and benthic macroinvertebrate assemblage.
25 Other CCWA Stream Restoration Activities East Jesters Creek Fourt Phases Gateway (2,300 feet) Reynolds Rd (2,000 ft) Morrow (3,500 feet) Lake City (1,600 feet)
26 Midway Park Stream Restoration Stream located within County park impacted by urbanization. Project identified in Big Creek WIP for sediment reduction Proposed design involves: Restoration of approximately 1,000 feet of stream using natural channel design techniques. Stabilizing stormwater outfalls from Midway Park Design completed 07/2010 Design funded with general funds 319(h) grant application submitted for construction funding in 2011 Forsyth County Engineering
27 What are stormwater wetlands? Created wetland ecosystems (shallow marshes) for treatment of stormwater runoff (quality and quantity) What do stormwater wetlands accomplish? Restore altered watershed hydrology to more natural conditions Treat sediment laden runoff Heavy metal uptake and nutrient cycling / removal Create aquatic and wetland habitat What pollutants are addressed? Sediment, nutrients, metals, pathogens Degraded aquatic habitat Project Examples Ridgeland Forest Gwinnett County North Fork Peachtree Gwinnett County
28 Ridgeland Forest Stream Restoration and Stormwater Wetland Stream on County property impacted by urbanization. Project identified in WIP for sediment reduction Restored approximately 750 feet of stream using natural channel design techniques. Priority 3 restoration of a F channel to a Bc channel Constructed j-hook vanes, cross vanes, step-pools, and soil bioengineering. Created 0.5 acre off channel wetland to treat 50 acre drainage basin. Project completed 01/10 Funded by 319(h) grant and stormwater utility Gwinnett County DWR
29 Ridgeland Forest Stream Restoration and Stormwater Wetland Project
30 Ridgeland Forest Stream Restoration and Stormwater Wetland Project Project Benefits Reduced bank erosion Reduced sedimentation Improved habitat Improved fish and benthic macroinvertebrate assemblage. Stormwater treatment for sediment and improved watershed hydrology
31 North Fork Peachtree Creek Restoration and Stormwater Wetland North Fork Peachtree Creek listed for fecal coliform and biota (sediment) due to urbanization. Contributing drainage (135 acres) over 50% impervious. TMDLs developed for FC and Biota (30% reduction in sediment required) Construction underway of 1,200 feet of natural channel design restoration. Offline stormwater wetland designed as shallow extended detention wetland Funded by 319(h) grant and stormwater utility Gwinnett County DWR
32 Culvert Replacement Diversion Channel Trail Treatment Wetland Outfall Stream Restoration
33 North Fork Peachtree Creek Restoration and Stormwater Wetland Project Benefits Reduced bank erosion Water quality treatment of 135 acres watershed Flood peak attenuation Infrastructure improvements Community enhancement
34 What are regional detention facilities? Detention facilities (typically wet ponds) constructed to treat a large portion of the contributing watershed area. What do regional detention facilities accomplish? Restore altered watershed hydrology (downstream of facility) to more natural conditions. Treat sediment laden runoff. Heavy metal uptake and nutrient cycling / removal Create aquatic and terrestrial habitat What pollutants are addressed? Sediment, nutrients, metals, pathogens Altered watershed hydrology in retrofit situation Degraded aquatic habitat Project Examples Martin Heights Gwinnett County Dept. of Water Resources Flat Creek Regional Detention Facility City of Gainesville
35 Martin Heights Stream Restoration and Water Quality Improvement Project Tributary to Sweetwater Creek impounded by in-line pond Bank erosion caused by channel incision Restored 850 feet of channel (Priority 1) including daylighting 400 feet Converted existing pond into off-line regional detention facility Funded through GEFA loan and stormwater utility First County mitigation bank Gwinnett County DWR
36 Earthen Berm CMP Arch Culverts Sediment Filled Pond (Total Volume < 2 acre-feet) Concrete Spillway Degraded Forested Wetlands Sanitary Sewer Lines Impounded Stream (Length = 400 feet) Gwinnett County Property Line (Site Area = 5.8 acres)
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40 Martin Heights Stream Restoration and Water Quality Improvement Project Project Benefits Reduced bank erosion Improved habitat Flood attenuation and water quality improvement. 10 ac-ft of storage Generated stream mitigation credits to offset project cost Community improvement
41 Flat Creek Stream Restoration and Regional Detention Facility Flat Creek impacted by urbanization with eroding stream banks and poor water quality Restored 500 feet of stream channel using natural channel design techniques including 100 feet of daylighted culvert Regional detention pond provides 8.5 acre feet of water quality treatment for a 307 acre urban area. Project completed 03/09 City of Gainesville
42 Flat Creek Stream Restoration and Regional Detention Facility
43 Flat Creek Stream Restoration and Regional Detention Facility Project Benefits Reduced bank erosion Improved habitat Managed invasive species Flood attenuation and water quality improvement. 8.5 ac-ft of storage Integration with planned greenway Community improvement
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45 Projects highlighted are not the only ones! Others in the Metro District are implementing projects (Cobb County, DeKalb County, Forsyth County, Roswell, Alpharetta, Sandy Springs, and many others) Watershed improvement considerations: Projects typically most effective at addressing excessive sediment problems. Address altered watershed hydrology in conjunction with stream restoration activities (LID, regional detention, stormwater wetlands) Should be incorporated with other stormwater management objectives such as infrastructure improvement. Should seek to enhance the community. The implementation continues
46 Steve Leo and Pete Wright, Gwinnett County DWR Mike Thomas, Kevin Osbey, and Terry Moy, CCWA Tim Collins, Horace Gee, Barclay Fouts, City of Gainesville Renee Hoge and Steve Dempsey, Forsyth County Susan Rutherford, City of Atlanta Todd Crosby, Rockdale County David Chastant, Sandy Springs Alice Champagne, City of Roswell Chris Faulkner, Georgia EPD
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