Resident Canada Geese Management – Flow Public Meeting

Canada Geese enjoying the Scioto Mile.

Canada Geese enjoying the Scioto Mile in downtown Columbus.


Please join us for our next public information meeting 7 pm on December 7, 2015!

Our guest lecturer will be Jeff Pelc from the US Department of Agriculture (USDA). He will be speaking about resident Canada geese and how to effectively manage damages associated with them. He will touch on their life history, protection status/laws, and management techniques, including examples from the Olentangy river project.

345 E 2nd Ave
Columbus, OH 43201
(Veritas Community Church)

We will have a RAFFLE for FLOW shirts and a few other prizes, and we would love for you to participate!

Clintonville Area Pilot Project – BluePrint Columbus

Adena Brook in Clintonville is the site of a pilot project by the City of Columbus to investigate “the best method for eliminating the sanitary sewer overflow into Adena Brook in Whetstone Park.” The goal is to determine the best methods to reduce the amount of rain water that makes its way into the sanitary sewer system, causing the overflows. In addition, the city will be investigating green infrastructure options for updating its stormwater system. The goal of these updates is to clean and reduce the stormwater flow and help to protect our ravines and streams.

“Open House Events” are scheduled to provide a general overview about the project. The next open house will be held at Whetstone Shelter House 6 – 8 p.m. on June 29, 2015. Six additional neighborhood meetings will be held in July to provide specific information on the green infrastructure planned for specific streets.

For more information please visit the City of Columbus website for the Clintonville area pilot project, or view a short video about Blueprint Columbus.

Fifth Avenue Dam Removal

The 5TH Avenue lowhead dam was removed in August 2012, and the ecological restoration project began as pool levels were reduced above the 5th Avenue Dam. The ecological and riverbank restoration project ended in September of 2014. Please see the links below for details on the dam removal and river restoration efforts undertaken for the 5th Avenue dam project.

For more information:
5th Avenue Dam Project, Department of Public Utilities, City of Columbus
July 2014 5th Avenue Dam e-newsletter (PDF – 2.8 MB)
5th Avenue Dam Removal and progress with the Lower Olentangy Ecosystem Restoration Project
Proposed Removal Plan by Stantec (PDF – 11MB)

Rain Gardens

Rain gardens, which are depressions planted preferably with native plants, are another means to address stormwater issues. The deep root systems of the native plants allows water to infiltrate into the ground as opposed to running down the pavement and into the storm sewers. Urban rivers are heavily impacted by large volumes of stormwater that carry pollutants picked up from rooftops, driveways and roads. If you are interested in rain gardens, please visit the Central Ohio Rain Garden website.

Rain Garden Projects

Visit the rain garden project photo gallery or read the project report from FLOW Board Member Joe Tribble

Thanks to a $10,000 grant sponsored by MillerCoors and RiverNetwork, FLOW constructed a demonstration rain garden and water catchment at the Unitarian Universalist Church in Clintonville. This installation is step one in FLOW’s goal of 10 similar projects at local schools, churches, small businesses and other institutions.

Rain gardens are specially designed and planted gardens which collect rainwater and allow it to percolate slowly into the soil, reducing storm water run-off and preventing pesticides, petroleum products and other pollutants from being swept into our streams. Rain gardens also keep storm water from overloading the local sewer system.

FLOW volunteers worked with the members of the Unitarian Universalist Church to create design for the rain garden on the church’s property at 93 W. Weisheimer Road. Construction and planting were completed in early November of 2009.

Wildcat Run Stream Restoration

In August 2011, field work began on a project to restore several reaches of Wildcat Run. The work was conducted in Liberty Park, which is located at the intersection of Home Road and North Liberty Road in Delaware County Ohio. This page is devoted to information about the project, and updates on the progress being made.

History of Liberty Park

In January 1988, the Liberty Township Trustees purchased 97 gently rolling acres from Jack and Irma Extencamper with estate tax monies.  The results of a community survey in 1987 showed a strong desire for available recreational facilities in the township, and this property, located in the geographical center of the township,is the ideal location for such a facility.  The landscape design firm of Scruggs and Hammond was chosen to design the park, and a series of community forums were held to determine the wishes of the residents.  In May  1989, a three member Park Board was appointed by the Trustees to advise, formulate policy for the park, and develop a park budget.  The grand opening of Liberty Park was held on July 7, 1991.  Since then, Liberty Park expanded to include the wooded lot and ravines south of the original site as well as a forty-acre parcel to the south, fronting on North Liberty Road where the Liberty Township/Powell YMCA is now located.

Image of a wooded stretch of Wildcat Run runs through Liberty Park.

A wooded stretch of Wildcat Run runs through Liberty Park.

Why a Stream Restoration was Needed at Wildcat Run

The Olentangy River in southern Delaware County is a State Scenic River with exceptional warm water habitat. The main stem of the Olentangy currently meets state water quality standards. However, according to Ohio EPA studies (TMDL), the tributaries of the Olentangy have been hard hit by urbanization, resulting in nutrient and sediment loading and habitat loss. None of the tested tributaries to the Olentangy River in this area were in attainment. Therefore, in the long run, restoring and maintaining the health of the tributaries through storm water management is essential to maintaining the viability of the Olentangy River as an exceptional water resource.

Wild Cat Run is typical of the tributaries in this area. This tributary drains 1.9 square miles, including the Kinsale Golf and Country Club, three schools, and a YMCA which contain a combined 600,000 sq. ft. of impervious parking areas surrounding the feeder streams. As Wild Cat Run flows on through Liberty Park, it shows signs of degradation resulting from all of this upstream development. The stream has exhibited increased flow, flooding, and an incised channel that is disconnected from the flood plain. In addition, parts of the floodplain zone within the park have been denuded and lack a riparian buffer. All of these factors combine to contribute to the potential for flash flooding, nutrient and sediment loading, and poor quality habitat for wildlife that use the stream.

Because Wild Cat Run passes through Liberty Park, it presents a unique opportunity to restore the stream, and create a demonstration site for innovative storm water practices that could serve as a model for other townships and developers throughout Delaware County, which is the fastest growing county in Ohio. Furthermore, because the site is located at one of the busiest intersections in Delaware County, with thousands of weekly park visitors, the potential for public outreach is enormous.

Stream Restoration Metrics for Success

It is expected that the proposed project will reduce the potential for flash flooding and increase the assimilative capacity of the stream to help protect the downstream exceptional warm water habitat of the Olentangy River. The Ohio State University has agreed to loan equipment to monitor pre- and post-construction flow to determine the extent to which the project achieved this goal.
The project is also expected to improve habitat scores in the restored area. A Headwater Habitat Evaluation measures some physical characteristics of a stream including the stream-channel substrate, maximum pool depth, and average bankful width. These factors help to measure the health of a stream. An evaluation was conducted in 2010, and Wildcat Run area scored an Headwater Habitat Evaluation Index (HHEI) of 41. It is anticipated that, through natural channel design, that score could be improved to 65. A HHEI score greater than about 60 suggests that the physical characteristics of the stream are conducive to a healthy headwater habitat.
The project is also anticipated to result in load reductions for the following categories:
Sediment – reduction of 61.3 tons/yr
Phosphorus – reduction of 70.4 lbs/yr
Nitrogen – reduction of 140.9 lbs/yr
Measurements of sediment and nutrient levels will be collected before and after the stream restoration to determine if the load reductions are realized.

Project Timeline

Construction for the stream restoration kicked off in August 2011. In the autumn of 2011, vegetation will be planted so it can become established over the course of several months. In the autumn of 2012, the new drainage channels came “online” by diverting water from the original waterways. Final planting was completed in December 2012.
Project Costs
Approximate unit costs for the three stream segments that were restored were as follows:
Enhancing 440 linear feet of ditch from the Central Park Pond to form a linear swale ~$20/foot
Restoring 220 linear feet of the Southern Tributary to Wildcat Run using Self-Forming Channel Design ~$50/foot
Restoring 640 linear feet of the Main Channel of Wildcat Run using Natural Channel Design ~$100/foot


Resource Links:

Liberty Township Stormwater Demonstration Project

Let it Rain

“Let it Rain” — a raingarden project in Central Ohio
(from an engineer’s perspective)
Joseph C. Tribble; PE, CPESC
Stormwater Consultants, LLC

Installing the dry stream
© Joseph C. Tribble

I was fortunate to have had the recent opportunity to work on a raingarden design and installation project with Amy Dutt, of Urban Wild, and members of the First Unitarian Universalist (First UU) Church of Columbus (Ohio). Both Amy and I donated much time and effort on this project, but members of the church donated a good deal of time and effort as well. In addition, they gave us trust and patience — and that was very much appreciated. Without that, the efforts of Amy and myself would have been much more difficult. There were many other contributors on this project and they are mentioned below.

Raingardens – a new stormwater management tool

After over two decades of designing subdivisions, commercial sites and roadways in central Ohio, I thought I had mastered the art of stormwater management design. Paving the landscape and piping the runoff, with a little detention (to slow flowrates down a bit) and some treatment (to remove a few pollutants) had always been a good recipe. It was fast and efficient — and getting stormwater to the rivers as quickly as possible, after all, had always been the main goal. A little erosion, especially where no one would notice, wasn’t going to hurt anything, and, if it did, we could always just add a little more rock channel protection.

It took a while for the raingarden concept to catch on with me. At first, I wasn’t too impressed with the “landscaped holes in the ground” that didn’t drain anywhere. I couldn’t envision how they would be anything more than a mere “drop in the bucket” in the overall stormwater management scheme. But, I humored my raingarden friends and, in the process, began to come around. Maybe draining stormwater into a system of “engineered” filters could remove pollutants as effectively as conventional methods. Maybe giving stormwater an opportunity to recharge the groundwater system (reducing nuisance flooding and hard costs along the way) might be beneficial as well. If we put some thought and effort into this concept, maybe raingardens could become an effective tool to manage runoff, pollution and construction costs. It could be a win-win-win scenario.

When you get down to it, raingardens are nothing more than “sexy” bioretention filters (engineered depressions that treat first-flush runoff and allow managed infiltration) anyway. But, that sexy part of raingardens (ornamental plants, dry streams, etc.) is important. In order for them to catch on as a mainstream stormwater management tool, they have to provide aesthetic appeal. Equally important, however, is the ability to get them designed and constructed efficiently. If the design-build community could find ways to aesthetically, efficiently and cost-effectively incorporate raingardens (in lieu of traditional landscaping) into site-scapes, we might be able to use them to make a positive difference in “stormwater sustainability”.

A Raingarden Opportunity

In March 2009, when Heather Dean of FLOW (Friends of the Lower Olentangy Watershed) and I became aware of grants, from MillerCoors and River Network, to create sustainability demonstration projects, we jumped at the opportunity to create a raingarden project in the Olentangy River watershed — and we knew just the place to do it. Through another endeavor, we had become familiar with the First UU Church in the Clintonville area. They were good neighbors in the community, interested in environmental stewardship and, best of all, had a property that would allow a great demonstration raingarden to be installed. With the help of Amy Dutt, Heather partnered with First UU, prepared a winning proposal (complete with a project budget and concept plan) and received one of the MillerCoors/River Network grants. The concept plan included a stone wall and native plant material, both of which matched the surrounding landscaping, and a decorative “dry stream”. Winning this proposal was exciting for me. I’d be able to work with Amy, participate in the design and construction process — and see this raingarden concept develop first-hand.

Raingarden Planning

Although I was familiar with raingardens, I had never been involved in the design or construction of one before. A successful proposal and a concept plan were a good start, but there was also the issue of making it work — and trying to get it constructed before winter. Those issues made me a little nervous. This project would require retrofitting an existing roof drainage/storm piping system and those types of projects did not always go smoothly. I didn’t know it at the time, but building this raingarden was going to require a monumental effort on the part of the church and the design team — and significant coordination and cooperation with the City of Columbus, Columbia Gas, Igel Construction and others. I didn’t know it at the time, but building this raingarden was going to be an educational experience.


The location of the raingarden was a given. The green space on the north side of the First UU property had been a perfect spot from the beginning. Rainwater from the roof area was convenient, the location was highly visible to surrounding streets and there was plenty of unencumbered area (or so we thought) to work in. Our first assignment, however, was to determine the size of the raingarden. Although there are easy equations to compute raingarden size, this calculation wasn’t that straightforward. The configuration of the existing roof and pipe system(s) created a scenario where, if designed conventionally, we would have had either a very small garden (serving only a small part of the roof area) or a very large and expensive garden (serving the much larger roof area). Neither option was consistent with our project goals and budget.

We settled on a unique design. Our approach was to construct a manageably-sized raingarden and take the entire roof area to it, but incorporate two major deviations from conventional raingarden designs. The first deviation was to inlet stormwater from the roof and pipe system into a sub-surface aggregate trench, immediately below and integral with the dry stream. This gave us some much-needed elevation difference and would allow diffusion of the concentrated pipe system flows, keeping them from eroding the raingarden surface during heavier rains. The second deviation was to provide an overflow device (in an existing upstream manhole) that would allow excess roof runoff to bypass the raingarden when it reached capacity during storms that produced more rain volume than it could handle. This would keep the raingarden from being “flooded out” on a regular basis. Both of these deviations allowed us to treat the larger amount of roof area while protecting the raingarden as well. I hope these concepts can serve as a model for future projects (Raingarden System Schematic).


With our unique design approach in hand, the next task was to get City of Columbus approval of our concept, including the required modification to the existing sewer plan for the property. As many will attest, modifying an existing plan, even without a unique design approach, was normally a time-consuming process. In this case, however, working with the City could not have been easier. With the sustainability effort in mind, they took the time to understand what we were trying to accomplish — and worked with us as we obtained the necessary construction permit. The only major requirement was that we use a licensed contractor to retrofit the existing system. The City’s final and biggest help, however, was waiving the $2000 inspection fee. Without that, starting the project may have not been possible.

Raingarden Retrofitting — expect the unexpected

Gas Line Relocation

Retrofitting anything, especially when it’s old and background information is sketchy, can be a challenge. Our First UU Raingarden project would certainly prove that to be true. Before construction, we were aware that there would be conflicts with an existing irrigation system, but we had no idea that a 20-year-old gas service line would become our main roadblock. One of our project partners, Greenworks Ecological, was scheduled to begin garden excavation, but they had not been on the job thirty minutes before the discovery of the line in our work area brought everything to a complete halt. As it turns out, the gas service line had been constructed improperly, which had made it impossible to locate prior to beginning work. Regardless, a muddy mess had been created in a very visible location and we were stopped dead in our tracks. We knew people at the City who could help us with our plan approval, but finding someone to work with at the gas company was another matter.

I can’t say enough about the effort Amy Dutt put forth in making the First UU Raingarden project a reality. In addition to donating her time for design and installation project management, she worked tirelessly to stay on top of, and resolve, any problems that arose. Amy’s work with gas company representatives paid off almost immediately. Columbia Gas became a willing partner in our project, relocating the gas service in a very timely manner and at no cost to us. Without that, continuing the project may not have been possible.


Pipe system installation

With the gas service relocation completed, we were left with one last hurdle — finding a licensed contractor to retrofit the existing manhole with the bypass device and construct the new pipe system to the garden. Once again, Amy came through. She contacted her friend Joe Igel, who graciously volunteered his company to help us out. Igel Construction completed this last piece of the raingarden infrastructure, along with some of the remaining site grading, and did so in a timely and professional manner as well. As before, this work was done at no cost to the project, allowing us to complete it within our grant budget.

Raingarden Irony

Having completed the raingarden infrastructure, all that remained now was installation of the interior stone wall, dry stream and raingarden plants. For a “normal” raingarden, this step would have been major, but, for us, it was no big deal. We had already overcome several hurdles and were now in the home stretch. The raingarden gods, however, weren’t finished with our project yet — not without sending a little rain our way. Ironic, don’t you think, that, after all that effort, we could not complete the last step because the ground surface was too wet.

Dry Stream Installation

A few dry, late October days, however, allowed the wall (with help from Jim Roberts of Watershed Organics), stream and plants to be installed — and the First UU Raingarden became a reality on November 5, 2009. There are still a few minor items on the 2010 spring punch-list, but it looks great. If we can just get past one last irony, it would be awesome. That last irony, of course, is the perfect weather we’ve had since completion. “Let it Rain” — we’d all like to see our new raingarden in action.

Final thoughts

Being a part of the First UU Raingarden project was a great experience — not only from the knowledge I gained, but from the people I had the opportunity to work with. I was surprised at the level of cooperation we received from many parties. Cooperation that, in this economy, was unexpected. Although we were successful, I caution anyone who wants to retrofit a raingarden into any existing system. Expect the unexpected — and allow for time delays and additional costs. “Stuff Happens”!!!

With that said, I’m convinced that raingardens can have a prominent place in existing system and new-build stormwater management. For new-builds, raingarden networks, if properly planned at the beginning of a project, can be a very useful tool. As with conventional designs, however, they must be strategically placed on, and interfaced with other elements of, the site. Raingardens are not appropriate in all soil situations, should be kept away from building foundations, basements and heavily-trafficked or heavily-loaded areas and, as with other stormwater management methods, should be designed to consider and avoid water back-up and freeze-thaw issues. With these precautions in mind, however, raingardens, can, in my opinion, become a viable stormwater management tool.


After over two decades, it is possible to learn something new.

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