Planning Commission Agenda and Packet 2015 06 11

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Planning Commission Meeting Minutes March 12, 2015 Page 10 of 19 us is that we will mitigate post development rates back to pre -development conditions. We've considered two events, both the 10-year and the 100-year events. There will be water in that detention pond during any rainfall. We will revert back to City of Louisville design criteria for residence time. I do not remember what the water quality is, whether it is a 40 hour drain time or more. There will be a level of water quality within the outlet structure on the northern detention pond that will dictate residence time. We are trying to work this into the landscape as much as we can so we don't create a "bomb crater" there. We want to make it a more natural -feeling space. There is still more work to be done and we are in the preliminary stage. Brauneis says his underlying concern is that we are already asking for a reduced amount of public open space, and then we start changing potential quality when it comes to use of the public open space in an area. I expect that we will hear from certain people who are concerned about density. I am often a proponent of quality density. One of the things that lends to its quality is open space. As we narrow down on this, I think it will continue to an issue that we all need to learn more about. Nicole Delmage, Barrett Studio Architects, 1920 20th Avenue, Boulder, CO One clarification on the detention area is that we did not count the land that the detention depression is in as part of the dedication. It was the park -like land around the detention area in terms of our calculation. We imagine that this area can be an amenity for the community including possibly a community garden which could pair with the orchard. The natural area around becomes an important community amenity that people from off -site and on -site can experience and enjoy. The land that is specifically dedicated as a detention area would not be the dedicated square footage. Brauneis says that does make a huge difference at that point. I think we will see an elevation below a certain level that will not be included in the public land dedication. These are important numbers for us to see. Russell says he understands we are at an early stage. When there are numbers stated, we have to be clear about them. Although this is the preliminary and things could change, I don't want a final that will not get support. Regarding lane width, if it is as simple as you reduce the 12' lane width by one foot on each side, can you use that then to gain a foot of sidewalk? Is it that basic or is there some other nuance to civil engineering I don't understand? Erramouspe says if we are able to reduce the travel lanes on either of the roadways, we could take that extra width and plug it into a landscape strip or a sidewalk. At that point, we have a choice. We also have to deal with setbacks and buildings that butt up to the sidewalks. Russ says Staff believes there is room in the parking as 9' is generous. In the travel lane and parking lane, we think there is room to gain for the sidewalk. Rice says that it was stated that in counting the public land dedication, it does not include the detention pond itself. What portion of it are we talking about being encumbered? Russ says generally in the area shown in green, there is a drainage easement on the land as well as just beyond the pond. That is the encumbrance and it is outside the pond in the land count. Russ asks Josh or Nicole to speak specifically on the acreage count. There is also a drainage easement beyond the pond that is part of the facility that we know is part of the request. Rice clarifies that what Russ is calling encumbered is the drainage easement as opposed to the pond itself. DelMage says (using the graphic) that to the south of the graded detention area in the northeast corner, there is an easement for related civil work to allow drainage infrastructure to happen between the detention pond and the ditch itself. That is encumbered. Above grade, that land could be used as public outdoor space without there being any impact on either use. The land that is graded to be a detention area is definitely excluded from the dedication calculation. The