One of the big physical issues on The HangArt property is that of flood control. The property lies on the edge of a FEMA 100 year flood zone and there is a large lot to the north that slopes toward the HangArt lot. At the edge of these two properties there is a 2 foot drop down on to the HangArt lot. Sometimes rainfall floods into the Quonset hut and water gets in from the sides of the building, and most of the stormwater runs straight toward the 100 year old gallery building.
All of the Stormwater On Site Flows to the Corner of the 100 Year Old Gallery
One of our main goals is to address flood control on the lot. This is actually a really complicated situation. On top of the stormwater runoff from the adjacent lot, we also have to deal with the water running off of the Quonset hut, which does not currently have any gutters. There are also two small roofs that make up the sound room and the adjacent ramada (mentioned in the previous post).
In Tucson, it is starting to become popular practice to dig small stormwater basins to help catch runoff and help cultivate native vegetation. These basins catch and slow stormwater and help reduce flooding. They have even done these on neighborhood scales in The Rincon Heights Neighborhood in Central Tucson.
The problem on the HangArt site is that adjacent lot combined with the roofs create more stormwater than the space we have to dig basins can handle. The obvious solution is to install a cistern on the Quonset Hut, but for the time being we don't have the funding to buy a tank.
We also have to figure out how to divert stormwater from the adjacent lot toward the basins we dig. This is tricky situation though because there is only about 6 feet of space between the lot's fence and the Quonset Hut. Ideally we would be able to build a retention berm on the adjacent lot to direct water toward the basins. We don't know if this will be possible though as it would take cooperation from the landowner next door.
The Adjacent Lot Gives A Lot of Its Water To The HangArt
There Isn't Much Space to Direct Stormwater
There is also the careful balance we have to achieve between catching stormwater, and making sure it doesn't pose a threat to flooding in major storms. In designing how we want the water to flow, we have to make sure there is an emergency measure allowing stormwater to flow off of the HangArt site and into the alley. If our basins over flow we don't want to have them flood the buildings. The water must go elsewhere.
One thing we can do fairly soon is catch rainwater off of the smaller roofs, such as the ramada. We are incoperating rain barrels into our design for the ramada/snack/seating area. By catching this rain in barrels it takes some stress off of our basin system. The ramada site design will be discussed in detail in a later post.