PanCoef

<code>PanCoef</code> returns the value of Pan Coefficient (K_p).

Calculation of Evapotranspiration by FAO Penman-Monteith equation based on Allen, R. G., Pereira, L. S., Raes, D., Smith, M. (1998, ISBN:92-5-104219-5) "Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56".

Ali Ahani

FAO56

Evapotranspiration Based on FAO Penman-Monteith Equation

PanCoef function

<dl><dt>u_2</dt>
<dd>A numeric scalar that denotes the wind speed at the height 2m above the ground surface [m/s].</dd>
<dt>RH_mean</dt>
<dd>A numeric scalar that denotes the mean relative humidity. (\(30\% &lt;= RH_mean &lt;= 84\%\))</dd>
<dt>FET</dt>
<dd>A numeric scalar that denotes the fetch, or distance of the identified surface type [m] (\(1m &lt;= FET &lt;= 1000m\))
(grass or short green agricultural crop for case A, dry crop or bare soil for case B upwind of the evaporation pan)</dd>
<dt>type</dt>
<dd>A character string that denotes the type of pan and can take the options "Class A"
for Class A pan and "Colorado" for Colorado sunken pan.</dd>
<dt>fetch</dt>
<dd>A character string that denotes the fetch state and can take the options "dry" and "green".</dd></dl>

Arguments

<a href="https://www.fao.org/3/x0490E/x0490e00.htm">Allen, R. G., Pereira, L. S., Raes, D., &amp; Smith, M. (1998).
 Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56.
 Fao, Rome, 300(9), D05109.</a>

Reference

Pan Coefficient (K_p) — PanCoef

<dl>

<dt>u_2</dt>
<dd>A numeric scalar that denotes the wind speed at the height 2m above the ground surface [m/s].</dd>


<dt>RH_mean</dt>
<dd>A numeric scalar that denotes the mean relative humidity. (\(30\% &lt;= RH_mean &lt;= 84\%\))</dd>


<dt>FET</dt>
<dd>A numeric scalar that denotes the fetch, or distance of the identified surface type [m] (\(1m &lt;= FET &lt;= 1000m\))
(grass or short green agricultural crop for case A, dry crop or bare soil for case B upwind of the evaporation pan)</dd>


<dt>type</dt>
<dd>A character string that denotes the type of pan and can take the options "Class A"
for Class A pan and "Colorado" for Colorado sunken pan.</dd>


<dt>fetch</dt>
<dd>A character string that denotes the fetch state and can take the options "dry" and "green".</dd>

</dl>

<a href='https://www.fao.org/3/x0490E/x0490e00.htm'>Allen, R. G., Pereira, L. S., Raes, D., &amp; Smith, M. (1998).
 Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56.
 Fao, Rome, 300(9), D05109.</a>

PanCoef: Pan Coefficient (K_p)

Description

Usage

Value

Arguments

Reference

Details

See Also

Examples