屋上緑化の効果/ASLA発表資料
ASLAでは、”ASLA GREEN ROOF PROJECT ”を通して、屋上緑化の様々な効果を検証している。
12月5日の発表では、屋根への降雨量の内、78％の流出を防止しているとの発表があった。その他、水質浄化やヒートアイランド防止に関しても調査研究を実施している。
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Initial Testing Shows Green Roof Retaining Up to 78 Percent of Stormwater
Michael Van Valkenburgh Associates Inc. reports positive growth for green roof replanting as winter settles in.
In late November, ASLA Executive Vice President Nancy Somerville gave a presentation on the environmental benefits of green roofs to the Engineers Forum on Sustainability at the National Academy of Engineers. In addition to covering the usual environmental and institutional benefits of green roofs—stormwater runoff reduction, lower urban heat island, and reduced heating and cooling costs for buildings—Somerville revealed some statistics to quantify those advantages, based on early testing of the ASLA green-roof demonstration project.
According to early measurements from July through September, Somerville told the group, the green roof has retained 77.7 percent of the 7.57 inches of rain that fell during those three months. The amount retained during that time period equaled 7,390 gallons. In the October through November period, the roof retained 55 percent of the 8.3 inches of rain that fell. This decline can be explained by the fact that green roofs typically retain less water during the period the plants are dormant. Despite this drop-off, ASLA is very encouraged by the amount of water the roof is retaining.
In addition to these runoff tests, ASLA is performing water quality tests of the runoff that does come from the roof. The Chesapeake Bay Foundation is helping with the costs of these tests, and a civil engineer/water quality expert is doing the testing. While several samples have already been collected, the final results of the testing are not yet available. ASLA has installed temperature sensors on the green roof, as well as on a neighboring traditional roof. In the spring ASLA will begin comparing temperatures between the two roofs in order to gauge how green roofs can affect the urban heat island. These tests will be particularly telling since the control roof is identical to the ASLA roof prior to green-roof construction.
12月5日の発表では、屋根への降雨量の内、78％の流出を防止しているとの発表があった。その他、水質浄化やヒートアイランド防止に関しても調査研究を実施している。
---（以下転載）
Initial Testing Shows Green Roof Retaining Up to 78 Percent of Stormwater
Michael Van Valkenburgh Associates Inc. reports positive growth for green roof replanting as winter settles in.
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Photo by Sam Brown, Sam Brown Studios.
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In late November, ASLA Executive Vice President Nancy Somerville gave a presentation on the environmental benefits of green roofs to the Engineers Forum on Sustainability at the National Academy of Engineers. In addition to covering the usual environmental and institutional benefits of green roofs—stormwater runoff reduction, lower urban heat island, and reduced heating and cooling costs for buildings—Somerville revealed some statistics to quantify those advantages, based on early testing of the ASLA green-roof demonstration project.
According to early measurements from July through September, Somerville told the group, the green roof has retained 77.7 percent of the 7.57 inches of rain that fell during those three months. The amount retained during that time period equaled 7,390 gallons. In the October through November period, the roof retained 55 percent of the 8.3 inches of rain that fell. This decline can be explained by the fact that green roofs typically retain less water during the period the plants are dormant. Despite this drop-off, ASLA is very encouraged by the amount of water the roof is retaining.
In addition to these runoff tests, ASLA is performing water quality tests of the runoff that does come from the roof. The Chesapeake Bay Foundation is helping with the costs of these tests, and a civil engineer/water quality expert is doing the testing. While several samples have already been collected, the final results of the testing are not yet available. ASLA has installed temperature sensors on the green roof, as well as on a neighboring traditional roof. In the spring ASLA will begin comparing temperatures between the two roofs in order to gauge how green roofs can affect the urban heat island. These tests will be particularly telling since the control roof is identical to the ASLA roof prior to green-roof construction.
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