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Project H 2 G o. Houston, TX T yler G entry – F all 09 (REVISION2). Analysis. In order to make a calculation of water tank capacity requirements for the micro area of study, we will look directly at the Buffalo Bayou . The drainage area of the Buffalo Bayou is 103 square miles.
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ProjectH2Go Houston, TX Tyler Gentry – Fall09 (REVISION2)
Analysis • In order to make a calculation of water tank capacity requirements for the micro area of study, we will look directly at the Buffalo Bayou. • The drainage area of the Buffalo Bayou is 103 square miles. • The population in that drainage area is over 410,000. • The open stream is 116 miles. • During Hurricane Allison, a gauge on the Buffalo Bayou read 23.54 inches of water in 5 days, 14.45 inches of that were in 2 days. • If the entire area of the Buffalo Bayou’s drainage system received 7.3 inches of rain in a day, that would amount to: • 1 sq. mile = (5280x5280) or 27,878,400 s.f. • 7.3” = .6083333 of 1 foot • This equates to (.6083333x27,878,400/.6083333) 16,959,360 cubic ft. of water per mile. • This is (1 US Gal = .133680556 cubic ft.) or 126,865,350 Gallons per mile. • The total gallons in the Buffalo Bayou Drainage system through the day would then be (126,865,350x103) or 13,067,131,059 Gallons in a 24 hour period.
Analysis Cont’d • From these analysis images, we can assume that approximately 60% of the land in this area is impervious cover. • If we assume that at least 60% of the total gallons per day must drain through the bayou, this is still (13,067,131,059 Gallons*60%) 7,840,278,635 gallons per day or 326,678,277 gallons per hour flowing into the buffalo bayou.
As seen in the above diagram, the flood areas along the Buffalo bayou are divided into 7 approximately equivalent areas for implementation flood control systems. • Each area’s tanks would need to be capable of containing 2,240,079,610 gallons.
Size Requirements • 500,000 s.f. footprint • 2,240,079,610 gallons need to be removed / contained to prevent the 2 day long 500 year flood as seen in Tropical Storm Allison • 1 US Gal = .133680556 cubic ft. • We need to contain 299,454,962 cubic feet of water. • With this footprint, the structure needs to be approximately 600’ feet tall.
The Design H2Go • The structure is a set of modules that use the center of each structural support column (10’ diameter) for either suction tentacles or electrical supply. • The structure is to act as a gauge of the flooding throughout each region. • The levels are segmented so that if the water is flooding upstream, the left hand side of the gauge / collection tank displays to the city that this is happening. • If it downstream, we see the opposite. • Below is an example of flood waters coming in from upstream.
Re-Calculation • The following analysis is in order to determine the amount of water the natural bayou system can contain. • From numerous section studies, it is determined that the bayou has an average collection of 22’ deep x 145’ wide along 116 miles (612,480 l.f.) can contain an additional 1,953,811,200 cubic feet of water through the natural system. • This number can be divided by the (7) tanks along the bay, giving us a reduction of 279,115,886 cubic feet of required containment. • The new required containment is 299,454,962 - 279,115,886 = 20,339,076 cubic feet of water at (7) locations along the Buffalo bayou.
Critical Components - Redesign • Pump • Tubes • Tank
Critical Order • The pump/vacuum must be above the tank. • The tank must be 50’ above ground at the lowest point in order to have water pressure. • The tank requires columns. • The tentacles must come from the top as they have to connect to the pump / vacuum. • The entire system must be modular.
Resources • http://www.vacuum-guide.com/images/nash_904-vacuum-pump.jpg • http://www.allgreen.com.au/images/Water%20Tanks.jpg • http://www.lamidesign.com/blog/imgs/tubing.jpg • http://www.bchslahore.com/images/homes/Pleasant%20View%20Water%20Tank%20008.JPG • http://www.timboucher.com/journal/wp-content/uploads/2007/05/liberty-dam-free-flow4.gif • http://www.ucsusa.org/assets/images/ce/impoundment-final.jpg • http://www.sciencebuddies.org/science-fair-projects/project_ideas/Math_img080a.jpg