## Balsa Dam Q & A

**1. What is the size of the tank (reservoir) that will be used for testing?**

*The geometry of reservoir will be a rectangular prism having inside dimensions of
19” (in) long by 12” (in) wide, and a depth of 10” (in). The reservoir will be filled
with 5 gallons (the water level will not be completely filled to the top but should
have a depth of about 8 inches). The testing should take about 5 minutes (assuming
accurate flow rate). On the 19” face of the apparatus is where the dam will be secured.*

**2. Will the amount of water be poured in all at once, or will the water be standing
still at a certain height when testing begins? Or will a steady stream be put into
the tank (reservoir).**

*The water will be poured in all at once, there will be a total of 5 gallons in the
reservoir.*

**3. Are balsa wood sheets permitted as long as they are the proper grain type and thickness? **

*No, balsa sheets are not permitted.*

**4. What are the members? The envelope does not show any members. We are interpreting
this competition as a balsa wood sheet with various holes in it, is this correct?
Or should the entire dam be constructed with individual members of balsa wood (0.5in
X 0.5in sticks)?**

*The entire dam must be constructed with individual members of balsa wood (0.5in X
0.5in sticks).*

**5. Is there a restriction on the number of holes that can be used to relieve the water?
Or a restriction in size or shape of the holes?**

*There is no restriction in the shape or size of the opening in the dam.*

**6. Where would the placement of the bracket be located? So that the base of the tank/reservoir
and the opening of the bracket are at the same level or the 2" in Figure 2 are above
the base of the tank meaning that there will be an amount of water stuck?**

*The reservoir will start at the openings. 2 inches will be notched into the reservoir,
in which the dam will be secured.*

**7. Does the cross-section of the elements have to be specifically 0.5” x 0.5” or is
0.5” x 0.5” the maximum of the cross-sectional area?**

*0.5” x 0.5” is the maximum cross-sectional area, the elements do not have to be specifically
0.5” x 0.5”.*