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brae 236 lab 1 bryce

Course: BRAE 433, Fall 2011
School: Cal Poly
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DaFonte 9/22/10 BRAE Bryce 236 Lab 1 Irrigation System Tour Station 1: Border Irrigation As a group we were asked to use a stopwatch and tape measure to measure and record the time it takes for water to advance down the field once one of the borders was turned on. At time = 0 seconds the border was turned on. We observed the following data: Distance Down Field (ft) Time (min:sec) 10 :45 20 1:35 30 2:40 40 3:56...

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DaFonte 9/22/10 BRAE Bryce 236 Lab 1 Irrigation System Tour Station 1: Border Irrigation As a group we were asked to use a stopwatch and tape measure to measure and record the time it takes for water to advance down the field once one of the borders was turned on. At time = 0 seconds the border was turned on. We observed the following data: Distance Down Field (ft) Time (min:sec) 10 :45 20 1:35 30 2:40 40 3:56 50 5:20 Station 2: Furrow Irrigation The group was asked to set up the pipe by opening two gaps to two finger-widths each. We attached a dissipation sock to one gap and turned the system on. After the system ran for a couple minutes, we noticed that the furrow that was being hit by the non-dissipated gap of water was deteriorating as the high velocity water from the pipe was eroding the side of the furrow. However, the gap that had the dissipation sock connected to it dispensed water to the furrow that had a much lower velocity, thus reducing the amount of erosion greatly. We then turned the system, and put a dissipation sock on the second gap in the pipe for the second furrow. A dam was placed in one furrow a short distance from the head of field. The water in the dammed furrow rose to a higher level up the sides of the furrow, thus allowing the watering of the higher sections of the furrows. This creates less run off, and the longer the water sits in the furrow, the higher the furrow gets watered. The main differences between furrow irrigation and border strip irrigation is that the border strips are about 10-15 feet wide, while the furrows are only about 1 foot wide, thus specifying more precisely where you want the water to go. It is possible to use furrow irrigation to irrigate 1-inch during a single event by the use of a dam. Each person in the group also had to get a siphon to work. The group then had to measure the flow rate from one siphon tube by filling up a five gallon bucket and timing how long that process took. The the siphon filled five gallon bucket in 51 seconds, thus resulting in a flow rate of 5.88 gpm. Siphon tubes work by creating a vacuum in the tube that uses gravity to force the water from a higher location through the siphon tube and out to a location lower than the entrance of the tube. Station 3: Drip Irrigation The group then had to turn on a drip hose and not emitter spacing. We then measured the flow rate of 1 emitter. One emitter filled a container with 102 ml of water in 10 minutes, thus using dimensional analysis, the following flow rate can be found: (102 ml/10 min) x (60 min/1 hr) x (0.000264 gal/ml) = .16158 = .162 gal/hr We then had to cut apart one inline emitter and one online emitter. The inline emitters have the hoses, tapes and openings built into the tape. Once cutting open the tape, the locations of each of these was easily seen. The openings have a diameter of .5 mm, and the water coming in needs to be filtered to the opening no bigger than 1/10 the size of the opening. The online emitters are manufactured separately and then stuck into the hose through holes that are created by the user. The inside of the manufactured piece looks like a maze that the water must travel through and then make its way out the exit hole. This is possibly used to lower the velocity of the water entering the emitter to a speed that just drips out of the exit hole. A rough sketch of each is shown below, including arrows pointing where water enters and exits the emitter, as well as the path the water takes through the emitter. Station 4: Sprinkler Irrigation We had to set up and turn on a line of sprinklers, which included 4 separate pipes with one sprinkler located on each, and an end cap for the end pipe. We then measured the flow rate from one sprinkler by recording the time it took to fill up a five gallon bottle. The five gallon bottle took 1 minute and 3 seconds to fill, which results in a flow rate from one sprinkler of 4.76 gpm.
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