2015-05-26_PWETC_Minutes - Laserfiche WebLink

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Mr. Johnson duly noted that request, advising that it could be accomplished using GIS mapping software. Mr. Culver noted a lot of really innovative BMP's were being done, opining that he'd learned an immense amount about stormwater management, and the proactive innovations of the City to -date. Mr. Culver noted his interest in seeing those projects, and thanked the partnership offered by area watershed districts in accomplishing those efforts. Member Heimerl asked how successful rain barrels were in stormwater management, and asked if staff intended part of the education program to make them more available and help the public to understand their benefits. Mr. Johnson advised that staffs information included all BMP options (e.g. raingardens, rain barrels, porous materials, etc.), with some requiring more management as far as size and/or cost. Mr. Johnson opined that raingardens provided a dual purpose, while rain barrels were only as effective as they were managed and drainage of them between rain events. For instance, Mr. Johnson noted that with rain events such as those experienced over the last few weeks, since there was such significant rainfall, the barrels were not emptied so they couldn't capture all the water coming off roofs. From a practical sense, Mr. Johnson opined that rain barrels work as well as owners efficiently use them. Chair Stenlund opined that the public should still be encouraged to use rain barrels to capture rainwater for secondary uses. Mr. Johnson reviewed the pond inventory on the displayed map, noting the need for follow-up and monitoring of at least 250 locations, ranging from larger to smaller bodies of water, both public and private developments. Mr. Johnson advised that the goal was to inspect 20% of those outfalls annually and any junctions between and among other jurisdictions beyond Roseville. Mr. Johnson specifically addressed the Como Subwatershed 7 District within the Roseville drainage area, and previously reviewed by the Capitol Region Watershed District in 2010, identifying the need to reduce phosphorus to 6.8 lbs. per day and reduce the overall annual amount. As projects came forward within that area, Mr. Johnson noted the need to focus on that reduction goal. Mr. Johnson reviewed various drainage issues involved in just the upcoming Victoria Street project. At the request of Member Seigler, Mr. Johnson reviewed why phosphorus was bad for lakes, particularly as it serves as a catalyst for many invasive weeds and algae. Page 7 of 19