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PURPOSE:
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- To use the Thiessen and Reciprocal-Distance-Squared Methods to
calculate an average precipitation for a given watershed.
- Points = 2
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EQUIPMENT:
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- Watershed Figure (Note: P1 = 5.0 in, P2 = 5.4 in, P3
= 5.2 in, P4 = 6.0 in)
- Spreadsheet
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PROCEDURE:
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- Calculate the average
precipitation by applying the Thiessen Method.
Use the overlaid grid to estimate the overall area and individual
polygon areas.
- Produce a table for
the Thiessen Method that includes the polygon
areas including the total area, and the precipitation contribution from
each polygon as well as the final average precipitation.
- Calculate the average
precipitation by applying the Reciprocal-Distance-Squared Method. Divide
the watershed into at least four regions.
- Produce a table for
the Reciprocal-Distance-Squared Method that includes the
Reciprocal-Distance-Squared values for each box, the area of each box,
and the average precipitation as well as the final average
precipitation.
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DISCUSSION QUESTIONS (to be included in paragraph
format):
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- What are differences
between the Thiessen and
Reciprocal-Distance-Squared Methods?
- Consider the land use
shown on the figure. How could the Reciprocal-Distance-Squared Method be
utilized to take advantage of this information?
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Homework:
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Section 4.5 (1 and 4)
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