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02 - An experimental class on water-holding capacity in forestry using a handmade sprinkling instrument by vocational high school students

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XXV IUFRO WORLD CONGRESS

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Abstract

This study reports on an experimental class on water holding capacity in forestry, involving the use of a handmade and low-cost sprinkling instrument by vocational high school students to detect Hortonian overland flow, as proposed by Tanaka and Kuraji (2016). The low-cost sprinkling instrument consists of three plastic garden stakes, an iron flower-pot holder, a two-liter plastic bottle with a hole in the bottom, and a shower nozzle attached to the plastic bottle-goods can be bought at “100-yen shops” (a dollar store). Using the proposed instrument, students examined thrice whether Hortonian overland flow occurred at the forest plantations at school. These experimental classes were conducted in 2017 and 2018 in Kimitsu City, Japan. No flow or a few flows were observed during the first experiment. A leaf lodged against the shower nozzle restricted the water flow at the time of the second experiment; as a result, the drop of water was big, and Hortonian flow was observed in the ground. No leaves affected the water flow from the shower nozzle in the third experiment; as a result, the drop of water was small, and the flow was low in the ground. Thus, the students could consider the relationship between water-holding capacity and rainfall in a forest plantation.

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