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+# Estimation of the transpiration stream concentration factor
+
+The FOCUS groundwater guidance (FOCUS 2014, p. 41) states that a
+reliable measured log Kow for neutral pH must be available in order to
+apply the Briggs equation. It is not clarified when it can be regarded
+reliable, but the equation is stated to be produced for non-ionic
+compounds, suggesting that the compound should not be ionogenic (weak
+acid/base) or ionic.
+
+## Usage
+
+``` r
+TSCF(log_Kow, method = c("briggs82", "dettenmaier09"))
+```
+
+## Arguments
+
+- log_Kow:
+
+  The decadic logarithm of the octanol-water partition constant
+
+- method:
+
+  Short name of the estimation method.
+
+## Details
+
+The Dettenmaier equation is given to show that other views on the
+subject exist.
+
+## References
+
+FOCUS (2014) Generic Guidance for Tier 1 FOCUS Ground Water Assessments.
+Version 2.2, May 2014 Dettenmaier EM, Doucette WJ and Bugbee B (2009)
+Chemical hydrophobicity and uptake by plant roots. Environ. Sci. Technol
+43, 324 - 329
+
+## Examples
+
+``` r
+plot(TSCF, -1, 5, xlab = "log Kow", ylab = "TSCF", ylim = c(0, 1.1))
+TSCF_2 <- function(x) TSCF(x, method = "dettenmaier09")
+curve(TSCF_2, -1, 5, add = TRUE, lty = 2)
+legend("topright", lty = 1:2, bty = "n",
+  legend = c("Briggs et al. (1982)", "Dettenmaier et al. (2009)"))
+```