Note that the
nomograph method is only suitable for soils with an OM content <10%, but there are some soils (-5%) in NSW with an OM content above this limit.
Wischmeier W, Johnson C, Cross B (1971) A soil erodibility
nomograph for farmland and construction sites.
The developed lines (
nomograph) explain the sensitivity of S and B for both S [less than] B and S [greater than] B.
in the
nomograph, the largest heater temperature is 275 [degrees] C, so it is assumed that the maximum temperature of the polyethylene in the adapted butt fusion model is greater than this temperature.
One other point about spreading loss: The loss value derived from the
nomograph and from the above formula is for the spreading loss between two isotropic antennas (that is, antennas with "unity" or 0-dB gain).
To determine whether highway agencies are employing the ball-bank indicator or the TCDH
nomograph in setting the safe curve speeds, the actual recommended speed at each site was compared to the speeds derived via these methods.
The
nomograph based soil erodibility estimations have proved to give accurate results (DSI, 2000).
The new soil information data sets derived by Australian Soil Resources Information Systems (A SRIS) enable us to estimate erodibility (K) based on the modified USLE
nomograph (Eqns 3 and 4) of Loch and Rosewell (1992).
This reduced pressure level is then indexed on a scale against the temperature of the sample holding furnace and hydrogen level in cc/100 grams is read from the
nomograph." [5]
For loamy soil types K values may be obtained from the soil-erodibility
nomograph (Wischmeier and Smith, 1978; Renard et al., 1997).
For other soils, where a different subset of soil properties controlled particle size distributions after rainfall wetting, the original
nomograph was found to perform poorly.