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<br />000 <br />00 0 <br />o c;, <br />00000 <br />0000 <br />o 0 <br />o do <br /> <br />RAIN GAUGE <br /> <br />Like Capt. Hydro, you might wonder now much <br />it is going 10 rain. To tind oui. take a one Quart <br />plaShC bottle, cut ofllhe top and invert it ihto <br />the bottom 01 the bottle, making sure that the <br />diameter 01 the large end of the funnel is the <br />same as the diameter 01 the rest of the bottle. <br />Attach the top with masking tape. Calibrate the <br />bottle in cenlimetres to measure the rainfall and <br />bury it so that the funnel is a few centimeters <br />above ground level. A ruler may also be used as <br />a dip Stick to measure the daily precipitation. <br />Record the results on the following graph. <br /> <br /> <br />I <br /> <br /> <br />I <br /> <br />, <br /> <br />o <br /> <br />DATE <br /> <br />RAINFALL <br /> <br />(Yfl3f)f5[Jf1}() <br /> <br /> <br />iVTTYT~~~ <br /> <br />Construct two trays as shown. Putty the <br />cracks 10 make them water-tight. Pails <br />or glass lars may be used to collecllhe <br />fun-oil water. <br /> <br />A) Fill one tray With loose soil and the other with firmly packed soil. With both trays slightly tilted, water <br />each with the same amount with a sprinkling can_ How did the water How with each soil? <br /> <br />The water will be absorbed inro the loosely p<JCked soil but will run off quickly over the surface <br />of the firm soil. <br /> <br />WhiCh soli moved away laster? Why? <br /> <br />The loose soil will hold more water rhan the firm soil. Thus the water will flow over the firm <br />soil with more force and take the top soil with it. If the loose soil becomes sawrated. it will <br />then dislodge quickly. Slope, flow speed, and warer quanrity will all affect the erOjlon. <br /> <br />B) Fill both trays With SOli but cover one with sod. Water equally as before and observe the dlf1erence in <br />erosion and the run-off rate. Note the results: <br />PLAIN SOIL <br /> <br />With no vegeratlve cover, the water will run off quickly and carry loose soil With It. <br /> <br />0278 <br /> <br />SOD <br /> <br />Sod. or any other vegetative cover, will ciJtch iJnd hold the warer. <br />and the effects of erosion. <br /> <br />rhus retarding the run-off <br /> <br />C) FIll both trays with soil but give one more slope than the other. What happened? <br /> <br />The greater the degree of slope, the faster the water will run off. <br /> <br />-13- <br />