Thank you for your inquiry. Please note that because there have not been a viable and accurate inventory and condition assessment data on the retention ponds in the city, most of my responses to your questions are based on my preliminary research and estimates from Public Works personnel with at least 20 year of experience working in the department.
- What is the total number of retention ponds in the city of Port Orange? At least 200 retention ponds out of which the city may be responsible for maintaining at least 100 ponds.
- Can you break them down into several (maybe 5) different size category? They can be roughly broken down into 3 categories – small (40%), medium (40%), and Large (20%)
- How many of the retention ponds, within each category are in need of maintenance? An estimated average of 80% of the ponds, in all categories, are in need of some form of dredging or cleaning to increase storm water capacity and storage. Also, about 50% of the ponds may require an increase in the frequency of other maintenance, including bank mowing, bank stabilization, outfall cleaning, and others.
4.What type of maintenance do each of them need? On average, they need dredging, bank mowing, bank stabilization, outfall cleaning, intake cleaning, and others.
- 5. Approximately how long will it take for each type of maintenance and size of pond? Assuming 80% of the minimum of 100 ponds require dredging and assuming 1 pond is dredged each month, then it will take approximately 6.7 years to complete one cycle of maintenance. The other forms of maintenance such as increase in frequency of outfall cleaning and mowing can be achieved within 2 years as the department continues to restructure and reassign including contracting some work and focusing personnel on what they do best.
Again, my figures are based on observation and estimates from 27 years of managing the maintenance and rehabilitation of public works infrastructure including storm water drainage systems as well as from current Public Works personnel with significant experience. Hopefully, when we fully implement the Work and Asset Management System that the City Council just approved its purchase we as a department and city should be able to provide the data and the transparency that the public requests more quickly and accurately.
Branford N. Adumuah
Director of Public Works
From: Dianne Gardner [mailto:email@example.com]
Sent: Monday, August 31, 2015 1:51 PM
To: Adumuah, Branford
Cc: Newton White; Mark Schaefer; Mike Gardner; Ted Noftall; Burnette, Don; Green, Allen; Stiltner, Scott; Bastian, Drew; Ford, Bob; Johansson, Michael; Harden, David
Subject: Questions about pond maintenance
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I read your recent attached memo which states “the current maintenance backlog of retention ponds is at least 7 years”.
Pursuant to that statement, can you answer the following questions for me please?
- What is the total number of retention ponds in the city of P ort Orange?
- Can you break them down into several (maybe 5?) different size categories, largest to smallest?
- How many of the retention ponds, within each category are in need of maintenance?
- What type of maintenance do each of them need?
- Approximately how long will it take for each type of maintenance and each size of pond?
When you were addressing Dr. Bob Ford’s questions at the workshop last Tuesday about needed personnel, I thought I understood you to say that there was little archival data available to draw from to make any inferences on what had been done, when it had been done, what needed to be done, etc. Hence my request for clarification on how you arrived at the statement: “the current maintenance backlog of retention ponds is at least 7 years”.
Thank you Branford.
Dianne Templeton Gardner
618 Ruth Street
Port Orange, Florida 32127