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9/17/2020 4:15:13 PM
 
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Section 5: OPA Board Subject: Bainbridge Drainage Msg# 1097982
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The current improvement plan proposes to add approximately 50,000 cubic feet of overall storage within Bainbridge Pond
This work will only delay flooding, not reduce it. One acre-foot of water (the amount of water covering 1 acre to a depth of 1 foot) equals 326,000 gallons or 43,560 cubic feet of water, and weighs 2.7 million pounds. One inch of rain falling on 1 acre of ground is equal to about 27,154 gallons Your increased storage is a two-inch rainfall on one acre. How many acres are directing water into the Bannbridge Pond? Hundreds? As part of our changes to the plans to reflect the removal of the outfall improvements under Beauchamp Rd, we reviewed the proposed pipe sizing under all three roads, and downsized the pipes under Sandyhook so as to maintain storage in upstream swale section and not release more peak storm runoff into the areas around the Pinehurst Rd culvert crossing than is currently going there today. Should the we be able to one day improve conditions under and below Beauchamp Rd, additional capacity at this crossing can always be added at a later date. Downsizing pipes creates flooding upflow from those pipes. I really question the benefit versus expense of this project. Seems like it is doing something just to be doing something after the basic overall design was compromised. $800,000 is a great deal of money to spend on drainage improvements to reduce flooding when we have no place to put the water. |
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For reference, the above message is a reply to a message where: Good afternoon Joe, Sorry for just getting back to you. I needed some time to answer this one. Our original design included upgrades to the Beauchamp Road culverts and downstream areas to help storm runoff leave the Ocean Pines property more efficiently, but due to unforeseen issues with the downstream property owner and reductions in available grant monies due to the COVID pandemic, the scope of the ultimate project had to be revised as you are aware. The current improvement plan proposes to add approximately 50,000 cubic feet of overall storage within Bainbridge Pond, almost all attributable to the small amounts of fill (ranging from 1” – 9”) being placed to repair and level the pond’s dam embankment after years of erosion. The pond is also receiving a new outlet structure to better control storm outflows, as well as provide OPA maintenance staff a means to lower the water level in the pond in advance of anticipated large storm events, such as hurricanes. This will help greatly with stormwater when storms hit. Below Bainbridge Pond, the current plan proposes to replace the existing culverts under Beaconhill Rd, Sandyhook Rd, and Pinehurst Rd to ensure they remain viable conduits during storm events. As part of our changes to the plans to reflect the removal of the outfall improvements under Beauchamp Rd, we reviewed the proposed pipe sizing under all three roads, and downsized the pipes from the original scope of work under Sandyhook so as to maintain storage in upstream swale section and not release more peak storm runoff into the areas around the Pinehurst Rd culvert crossing than is currently going there today. Should we be able to one day improve conditions under and below Beauchamp Rd, additional capacity at this crossing can always be added at a later date. We worked together very thoroughly with the engineers, county and Bobby Shockley with Stormwater mgt to make sure we didn’t impact areas worse with any changes we made to the original scope of work. I hope this brief overview of the improvements currently being proposed is helpful in explaining it. Colby |
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