Flooding caused by Denver Development

Updated: Mar 22

Denver development has gotten out of control in the past 10 years. Entire neighborhoods are having historic, small, affordable homes demolished in place of multi-unit dwellings that cover every inch of the permeable land possible and allowed.

Denver Yimby: Flooding caused by Denver Development

Denver's immense amount of recent urban development affects flooding in many ways. Removing vegetation and soil, grading the land surface, and constructing drainage networks, increasing runoff and potentially causing flooding of our neighborhoods during storms. Urban flooding happens when water flows into an urban region faster than it can be absorbed into the soil or moved to and stored in a lake or reservoir.

Due to the unprecedented amount of new townhomes, ADUs and skyrises being built in our Denver neighborhoods, flooding has increased in the recent years – because when a developer purchases a single-home lot and then demolishes the house to build a much bigger building, much of the permeable land is lost – and the water can no longer be absorbed.

In new developments that are sadly sprawling across our entire state, typically flood control and big open spaces are part of the overall plan (not because the developers wanted to put them in, but because they have to in order to help control flooding). Take the Stapleton Neighborhood for example, which built in drainage ways in the form of naturalized parks to accomodate all the extra pavement and homes that would be built over the existing permeable ground.

In historic Denver neighborhoods, there is no "open space" left to catch water – the open space and permeable land is woven everywhere in our neighborhood in the form of our large landscapes. When a developer builds a 10-unit building on a block that was formerly a small home with a large landscape, the potential for flooding for the area increases because a ton of permeable ground is lost. Denver residents in our neighborhoods should not be subjected to this lack of planning or foresight by the city and developers. Permeable ground should not be allowed to be covered up in established urban neighborhoods.

Water-abosorbing and pollution-reducing trees should not be allowed to be removed to build larger buildings or impermeable hardscapes.

Denver Yimby: Flooding caused by Denver Development in East Area Plan

Take, for example, the property shown above. A developer recently purchased this historic small affordable home shown on left at 1327 N. Jersey Street. They are going to demolish this affordable, charming small home and replace it with a 10-unit building – right next to single-family residences. I highly doubt that any of the 10 units will be more affordable than the home was for the amount of space. And, this 10-unit structure will likely take up every inch of land allowed, leaving the neighbors with a new heat-island and more flooding potential. Additionally, I suspect the 10-unit building will be much higher than the beautiful home that it will replace, thereby shading the neighbors to the North – in effect, stealing their sun, causing ice issues and higher energy bills in the winter months.

To top it off, see the sign below from our Mayfair neighborhood, where Pete Pappas has requested to build less parking – not to save permeable space, but so they can squeeze more units and make more money at the cost to the neighborhood. Developers will always tout that the new residents won't need cars, but that's a fallacy – of course they will need cars! Our public transportation system is unaffordable and inconvenient, and there are no good options to get to the mountains, which is where nearly every one of the new residents will want to go. The neighbors will be the ones who suffer when parking on their street suddenly becomes impossible with cars lining the entire street and blocking their driveways. And, to make things worse, these narrow streets were not made to handle parking on both sides, so it makes it difficult for two cars to drive down the street in opposite directions without having to pull over to let the other car come through. Congestion, noise, pollution. The developers claim they are creating more housing to help our neighborhoods, when, in reality, they are turning our neighborhoods into congested, overcrowded, noisy, hot places in exchange for MONEY. They are basically pillaging our neighborhoods and walking away with millions.

Denver Yimby: Flooding caused by Denver Development in East Area Plan - Builders are not building enough parking!

Every landscape that is covered with buildings or concrete becomes part of the problem.

Denver City Planners, we ask you:

Where does all the water go now that the city has allowed developers to build over every inch of permeable surface possible?

Denver YIMBY: Flooding caused by Denver Development

Above is an example of the problems of density and water runoff – shown here is an example of a snowplowing company moving all the snow from the completely paved over property of a series of rowhomes into a neighboring yard (without permission.) Because they paved over every inch of this property, there isn't anywhere for the snow to be plowed, the snowplowing company should have found a place to put it on the property or removed it fro the property to relocate somewhere where it is legal to do so, rather than dumping it into neighboring property without permission. Denver City Council has recently changed zoning recommendations for the East Area of Colfax to allow for more density already. They also keep pushing more changes through, using this past year of the Covid-19 pandemic to pass through unwanted zoning changes to our neighborhoods, even though there has been widespread public outcry from thousands of the property-paying residents who live here. See what has happened over on the West side of Denver – landscapes are quickly disappearing under row homes and density housing:

We have to stop Denver city planners and city council from from changing our zoning, and protest the destruction of our historic landscapes and homes to be replaced with high density overpriced housing. We are Denver YIMBYs for good – and we're all about protecting what's left of Denver's open spaces and small, affordable historic homes! Let's not let developers come in and build multi-unit highrises and dwellings in our neighborhoods, causing flooding, congestion and problems for us all.