Target Grade: 6th grade Integrated Science. Earth and Physical emphasis.
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- Hector Lester Logan
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1 Water Holding Capacity and Permeability of different Grain Sizes Cascades to Coast GK-12 Curriculum Fellow: Ted Hart (PSU Environmental Science) Teacher: Kirk Ordway (Mt Tabor Middle School) Advisor: Dr. Alan Yeakley (PSU Environmental Science) Learning goal: Practice lab techniques commonly used by soil scientists and hydrologists, and make a physical connection between grain (particle) size, porosity (% of open space), water holding capacity (soil moisture) and permeability (infiltration rate). Target Grade: 6th grade Integrated Science. Earth and Physical emphasis. State Standards: 6.1P.1 Describe physical and chemical properties of matter and how they can be measured. 6.2E.1 - Explain the water cycle and the relationship to landforms and weather. 8.3S.2- Organize, display, and analyze relevant data, construct an evidence-based explanation of the results of a scientific investigation, and communicate the conclusions including possible sources of error. Suggest new investigations based on analysis of results. Activity Summary: Two minute activities (1 st day form hypotheses and collect data, 2 nd day construct graphs and form conclusions) using the scientific method to investigate the properties of grain size and porosity in order to determine which soil type will have greater water holding capacity and permeability during dry and wet conditions. Activity Plan: Groups of 3 students work well, but this can be done in pairs. Set up: (5 minutes) 1) Number the wash bins to indicate the number of the group 2) Assemble the following for each group on the class room tables: a. One plastic 1-L graduated cylinder b. One plastic container with sand and another gravel (15-20 ¼ in holes in bottom) c. Jug of tap water 1
2 d. Wash bin e. Ruler f. Stop watch g. Sponge and paper towels 3) Place all the smaller items (sponge) in the wash bin Introduction (5-10 minutes): 1) Review the USGS grain (particle) size chart (last page) 2) Show students how to measure the diameter of a piece of gravel and the distance between grains. 3) Discuss with students how porosity size might affect water holding capacity (soil moisture) and permeability (infiltration rate). 4) Discuss with students their sand and gravel using terms in the USGS chart (i.e. poorly sorted). 5) Brainstorm hypotheses with students that compare the porosity and permeability of sand and gravel. Discuss how dry and wet sand and gravel may affect these properties and processes. Work time (30 minutes): 1) Demonstrate steps 7-17 filling out values in the table. 2) Double check all values are recorded in everyone s table. 3) If desired pool class data and calculate averages at the front of the room on white board/overhead for students to graph. 4) Provide examples for graphs and explain how they answer hypotheses Related Concepts: Structure (hydrogen bonds) and properties (cohesion, adhesion, etc.) of water. Structure (shape) and chemistry (quartz) of rocks and soil. Sorted versus poorly sorted grain size. Materials: Each student group will need the following: 1) One plastic 1-L graduated cylinder 2) Two 1-L plastic containers (slightly smaller or larger is ok). Drill ¼ in diameter holes in bottom of each container. Holes should be approximately ½ in from each other so the bottom of the container doesn t develop cracks. 3) 4 L jug of tap water (class room sink is ideal) 4) One 12-L wash bin 5) 0.5 L of sand (preferably 0.5-2mm diameter of similar size/well sorted) and 0.5 L of gravel (preferably 3-5mm diameter of similar size/well sorted). Home improvement stores carry landscaping sand and gravel that often are of this size and work well. 6) Ruler with mm increments 7) Stop watch 8) Sponges and paper towels (cleaning up) 2
3 Extensions: Grain size analysis, water properties, soil maps. Students will start to see why different grain sizes are used for different applications such as using drain rock for irrigation and sand in soccer or baseball fields. Assessment Questions: On worksheet below. Handouts and worksheets: Next page. 3
4 Water Grain diameter (mm) Porosity (mm) Why grain size (diameter) matters: Gravel in your driveway and sand in your lawn Inquiry: What is grain size and how do we use them to build areas like driveways and lawns? Give an example at your house/near where you live: Materials: Each group needs 1 graduated cylinder 1 plastic container filled with sand 1 plastic container filled with gravel 1 jug of tap water 1 wash bin 1 ruler 1 top watch 1 Sponge Sand Gravel Condition: Dry Wet Difference Dry Wet Difference Water in (ml) Water out (ml) Water in soil (ml) Time (min:sec) 4
5 Procedure: OBSERVATIONS AND FORMING HYPOTHESES 1) Measure the diameter of ten sand and ten gravel grains from the plastic containers. Show work here: a) Sand: / 10 = b) Gravel: / 10 = 2) Are the averages within the sand and gravel dimensions listed on the USGS chart? 3) On white notebook paper, clump approximately 15 grains of sand together so as much of sand grains are touching but the sand grains are not on top of one another and you can still see the white paper between the sand grains (picture above). 4) Measure the diameter of the space (porosity) between the grains. Do this 10 times for each grain type. If it s too difficult to do for sand just do gravel. Show work here: a) Sand: / 10 = b) Gravel: / 10 = 5) How does the average porosity diameter compare with the average diameter of the grains? 6) Write 2-3 hypotheses that compare the porosity and permeability of sand and gravel. You may include whether it s dry or wet. Hypothesis # 1: Hypothesis # 2: Hypothesis # 3: 5
6 RUNNING TEST 7) Empty bin. 8) Fill graduated cylinder with 1 L of water. 9) Hold container with 0.5 L of sand approximately six inches above the bin. 10) Start the stop watch right when you pour the water into the container with sand. 11) Poor the 1 L of water from the graduated cylinder slowly (should take about 30 seconds) into the container with sand. Don t spill any water over the edges of the container holding sand, as all water should be either in the container with sand or in the bin. 12) Let the container with sand drain until constant flow ceases (only slow dripping). 13) Stop the stop watch and record the time (dry sand column) in the table (first page) it took for the water to pass through the container with sand. 14) Measure the volume of water (ml) that passed through the sand. 15) Record this value in the table (dry sand column). 16) Subtract this value from the amount poured in (1000ml or 1L) to find the amount of water in the sand. 17) Record this value in the table (dry sand column). 18) Repeat steps 7-17 for the same container with sand (now wet sand column). 19) Repeat steps 7-17 for gravel, first dry then wet. 20) Double check all data is recorded in your table. 21) Using your table, construct graphs for: a. Water retained by sand and gravel during the dry and wet tests b. Time to infiltrate for sand and gravel during the dry and wet tests. Questions: 1) Explain how dry sand or gravel might increase water holding capacity: 2) What other properties of gravel make it suitable for driveways? 6
7 3) What other properties of sand make it suitable for lawns? 4) Write your conclusion for each of your hypotheses: Hypothesis # 1: Hypothesis # 2: Hypothesis # 3: USGS grain size chart ( 7
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