Differences

This shows you the differences between two versions of the page.

--- green_roof [2023/11/09 09:33] – admin
+++ green_roof [2024/02/08 15:33] (current) – admin
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 ====Adjusted Curve Number====
-Peak rate and volume calculations should follow the steps below to determine an adjusted curve number for use in hydrology calculations. Volume reduction on a green roof is achieved primarily through the drainage layer and growing medium components, which absorb and retain a portion of the rainfall that lands on it making it available for plant uptake and evapotranspiration. For the calculation of runoff retention in the growing medium, the maximum available water capacity for runoff reduction is the difference in the water content between the field capacity and the wilting point.
+Peak rate and volume calculations should follow the steps below to determine an adjusted curve number for use in hydrology calculations. Volume reduction on a green roof is achieved primarily through the drainage layer and growing medium components, which absorb and retain a portion of the rainfall that lands on it making it available for plant uptake and evapotranspiration.
+For the calculation of runoff retention in the growing medium, the maximum available water capacity for runoff reduction, or **𝜂<sub>1</sub>**, is the difference in the water content between the field capacity and the wilting point.
   * Field capacity is the water content of the soil after free drainage has ceased.
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 Values for field capacity and the wilting point of the selected growing medium must be obtained either from a published research article or tested in accordance with either the ASTM D-6836 method or the Soil Survey Investigations Report No. 42, Kellogg Soil Survey Laboratory Methods Manual, published by NRCS.
-The following calculation, adapted from the [[https://www.nj.gov/dep/stormwater/bmp_manual/NJ_SWBMP_9.4-gree-roofs.pdf|New Jersey Stormwater Best Management Practices Manual]], can be used to determine the adjusted curve number which can then be used in approved hydrology models to determine the reduction in runoff peak rates and volume provided by a green roof.
+The following calculation, adapted from the [[https://dep.nj.gov/wp-content/uploads/stormwater/bmp/nj_swbmp_9.4-gree-roofs.pdf|New Jersey Stormwater Best Management Practices Manual]], can be used to determine the adjusted curve number which can then be used in approved hydrology models to determine the reduction in runoff peak rates and volume provided by a green roof.
-<html>
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-<center></html>
-Step 1 - Calculate storage volume of green roof
-<html>
-</center></html>
 //Step 1 - Calculate storage volume of green roof//
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 ====Adjusted Curve Number Calculator====
-=The calculator below can be used to find the adjusted curve number, with the source spreadsheet available {{:dane_county_green_roof_-_adjusted_cn_calculator.xlsx| here}}.=
+The calculator below can be used to determine the adjusted curve number, with the source spreadsheet available {{:dane_county_green_roof_-_adjusted_cn_calculator.xlsx| here}}.
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