**[(IWM -- 3) Soils Data Interpretation Table for IWM Planning]{.mark}**

<table>
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<tbody>
<tr class="odd">
<td rowspan="2"><strong>Soil Texture</strong></td>
<td rowspan="2"><blockquote>
<p><strong>% Sand</strong></p>
</blockquote></td>
<td rowspan="2"><blockquote>
<p><strong>% Silt</strong></p>
</blockquote></td>
<td rowspan="2"><blockquote>
<p><strong>% Clay</strong></p>
</blockquote></td>
<td rowspan="2"><blockquote>
<p><strong>CEC Range</strong></p>
<p><strong>(meq/100g)</strong></p>
</blockquote></td>
<td rowspan="2"><blockquote>
<p><strong>Bulk Density</strong></p>
<p><strong>(g/cm<sup>3</sup>)</strong></p>
</blockquote></td>
<td colspan="2" rowspan="2"><blockquote>
<p><strong>Soil weight</strong></p>
<p><strong>(Million lbs. per ac-ft)</strong></p>
</blockquote></td>
<td colspan="2"><p><strong>Soil</strong></p>
<p><strong>Solids</strong></p></td>
<td colspan="2"><p><strong>Unavail-able</strong></p>
<p><strong>Water</strong></p></td>
<td colspan="2"><p><strong>Available</strong></p>
<p><strong>Water</strong></p></td>
<td colspan="2"><p><strong>Soil</strong></p>
<p><strong>Porosity</strong></p>
<p><strong>at FC</strong></p></td>
</tr>
<tr class="even">
<td><p><strong>%</strong></p>
<p><strong>Vol.</strong></p></td>
<td><strong>in/ft</strong></td>
<td><p><strong>%</strong></p>
<p><strong>Vol.</strong></p></td>
<td><strong>in/ft</strong></td>
<td><strong>% Vol.</strong></td>
<td><strong>in/ft</strong></td>
<td><strong>% Vol.</strong></td>
<td><strong>in/ft</strong></td>
</tr>
<tr class="odd">
<td><strong>Sands</strong></td>
<td><strong>86 - 98</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>2 - 8</strong></td>
<td rowspan="18"><p><strong>2 – 6</strong></p>
<p><strong>3 – 8</strong></p>
<p><strong>7 – 15</strong></p>
<p><strong>10 –19</strong></p>
<p><strong>15 - 30</strong></p></td>
<td><strong>1.65</strong></td>
<td colspan="2"><strong>4.48</strong></td>
<td><strong>62.3</strong></td>
<td><strong>7.47</strong></td>
<td><strong>2.5</strong></td>
<td><strong>0.3</strong></td>
<td><strong>4.17</strong></td>
<td><strong>0.5</strong></td>
<td><strong>31.1</strong></td>
<td><strong>3.73</strong></td>
</tr>
<tr class="even">
<td><strong>Loamy Sands</strong></td>
<td><strong>72 - 88</strong></td>
<td><strong>2 - 28</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>1.6</strong></td>
<td colspan="2"><strong>4.35</strong></td>
<td><strong>60.4</strong></td>
<td><strong>7.25</strong></td>
<td><strong>7.0</strong></td>
<td><strong>0.84</strong></td>
<td><strong>8.33</strong></td>
<td><strong>1.0</strong></td>
<td><strong>24.3</strong></td>
<td><strong>2.91</strong></td>
</tr>
<tr class="odd">
<td rowspan="4"><p><strong>Fine Sands</strong></p>
<p><strong>V. F. Sands</strong></p>
<p><strong>Loamy F. Sands</strong></p>
<p><strong>Loamy V. F. Sands</strong></p></td>
<td><strong>86 - 98</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>2 - 8</strong></td>
<td><strong>1.65</strong></td>
<td colspan="2"><strong>4.48</strong></td>
<td rowspan="4"><strong>61.5</strong></td>
<td rowspan="4"><strong>7.38</strong></td>
<td rowspan="4"><strong>10.2</strong></td>
<td rowspan="4"><strong>1.22</strong></td>
<td rowspan="4"><strong>10.4</strong></td>
<td rowspan="4"><strong>1.25</strong></td>
<td rowspan="4"><strong>17.9</strong></td>
<td rowspan="4"><strong>2.15</strong></td>
</tr>
<tr class="even">
<td><strong>86 - 98</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>2 - 8</strong></td>
<td><strong>1.65</strong></td>
<td colspan="2"><strong>4.48</strong></td>
</tr>
<tr class="odd">
<td><strong>72 - 88</strong></td>
<td><strong>2 - 28</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>1.6</strong></td>
<td colspan="2"><strong>4.35</strong></td>
</tr>
<tr class="even">
<td><strong>72 - 88</strong></td>
<td><strong>2 - 28</strong></td>
<td><strong>2 - 14</strong></td>
<td><strong>1.6</strong></td>
<td colspan="2"><strong>4.35</strong></td>
</tr>
<tr class="odd">
<td rowspan="2"><p><strong>Sandy Loam</strong></p>
<p><strong>Fine Sandy Loam</strong></p></td>
<td><strong>46 - 84</strong></td>
<td><strong>2 - 48</strong></td>
<td><strong>2- 18</strong></td>
<td><strong>1.56</strong></td>
<td colspan="2"><strong>4.24</strong></td>
<td rowspan="2"><strong>58.8</strong></td>
<td rowspan="2"><strong>7.06</strong></td>
<td rowspan="2"><strong>12.3</strong></td>
<td rowspan="2"><strong>1.48</strong></td>
<td rowspan="2"><strong>12.5</strong></td>
<td rowspan="2"><strong>1.5</strong></td>
<td rowspan="2"><strong>16.3</strong></td>
<td rowspan="2"><strong>1.96</strong></td>
</tr>
<tr class="even">
<td><strong>46 - 84</strong></td>
<td><strong>2 - 48</strong></td>
<td><strong>2 - 18</strong></td>
<td><strong>1.56</strong></td>
<td colspan="2"><strong>4.24</strong></td>
</tr>
<tr class="odd">
<td rowspan="4"><p><strong>V. F. Sandy Loam</strong></p>
<p><strong>Loam</strong></p>
<p><strong>Silt Loam</strong></p>
<p><strong>Silt</strong></p></td>
<td><strong>46 - 84</strong></td>
<td><strong>2 - 48</strong></td>
<td><strong>2 - 18</strong></td>
<td><strong>1.53</strong></td>
<td colspan="2"><strong>4.16</strong></td>
<td rowspan="4"><strong>55.4</strong></td>
<td rowspan="4"><strong>6.65</strong></td>
<td rowspan="4"><strong>16.2</strong></td>
<td rowspan="4"><strong>1.94</strong></td>
<td rowspan="4"><strong>16.7</strong></td>
<td rowspan="4"><strong>2.0</strong></td>
<td rowspan="4"><strong>11.8</strong></td>
<td rowspan="4"><strong>1.41</strong></td>
</tr>
<tr class="even">
<td><strong>26 - 50</strong></td>
<td><strong>30 - 48</strong></td>
<td><strong>10 - 26</strong></td>
<td><strong>1.42</strong></td>
<td colspan="2"><strong>3.86</strong></td>
</tr>
<tr class="odd">
<td><strong>2 - 48</strong></td>
<td><strong>52 - 78</strong></td>
<td><strong>2 - 26</strong></td>
<td><strong>1.46</strong></td>
<td colspan="2"><strong>3.97</strong></td>
</tr>
<tr class="even">
<td><strong>2 - 18</strong></td>
<td><strong>82 - 98</strong></td>
<td><strong>2 - 10</strong></td>
<td><strong>1.47</strong></td>
<td colspan="2"><strong>3.99</strong></td>
</tr>
<tr class="odd">
<td rowspan="3"><p><strong>Sandy Clay Loam</strong></p>
<p><strong>Silty Clay Loam</strong></p>
<p><strong>Clay Loam</strong></p></td>
<td><strong>46 - 78</strong></td>
<td><strong>2 - 26</strong></td>
<td><strong>22 - 36</strong></td>
<td><strong>1.4</strong></td>
<td colspan="2"><strong>3.8</strong></td>
<td rowspan="3"><strong>50.2</strong></td>
<td rowspan="3"><strong>6.02</strong></td>
<td rowspan="3"><strong>20.0</strong></td>
<td rowspan="3"><strong>2.4</strong></td>
<td rowspan="3"><strong>18.3</strong></td>
<td rowspan="3"><strong>2.2</strong></td>
<td rowspan="3"><strong>11.5</strong></td>
<td rowspan="3"><strong>1.38</strong></td>
</tr>
<tr class="even">
<td><strong>2 - 18</strong></td>
<td><strong>42 - 70</strong></td>
<td><strong>28 - 38</strong></td>
<td><strong>1.27</strong></td>
<td colspan="2"><strong>3.45</strong></td>
</tr>
<tr class="odd">
<td><strong>22- 44</strong></td>
<td><strong>18 - 50</strong></td>
<td><strong>28 - 38</strong></td>
<td><strong>1.32</strong></td>
<td colspan="2"><strong>3.59</strong></td>
</tr>
<tr class="even">
<td rowspan="3"><p><strong>Sandy Clay</strong></p>
<p><strong>Silty Clay</strong></p>
<p><strong>Clay</strong></p></td>
<td><strong>46 - 62</strong></td>
<td><strong>2 - 16</strong></td>
<td><strong>38 - 54</strong></td>
<td><strong>1.33</strong></td>
<td colspan="2"><strong>3.61</strong></td>
<td rowspan="3"><strong>47.9</strong></td>
<td rowspan="3"><strong>5.75</strong></td>
<td rowspan="3"><strong>21.5</strong></td>
<td rowspan="3"><strong>2.58</strong></td>
<td rowspan="3"><strong>16.7</strong></td>
<td rowspan="3"><strong>2.0</strong></td>
<td rowspan="3"><strong>13.9</strong></td>
<td rowspan="3"><strong>1.67</strong></td>
</tr>
<tr class="odd">
<td><strong>2 - 18</strong></td>
<td><strong>42 - 58</strong></td>
<td><strong>42 - 58</strong></td>
<td><strong>1.23</strong></td>
<td colspan="2"><strong>3.34</strong></td>
</tr>
<tr class="even">
<td><strong>2 - 44</strong></td>
<td><strong>2 - 38</strong></td>
<td><strong>42 - 98</strong></td>
<td><strong>1.25</strong></td>
<td colspan="2"><strong>3.4</strong></td>
</tr>
<tr class="odd">
<td colspan="7"><ul>
<li><p><strong>V = Very &amp; F = Fine</strong></p></li>
<li><p><strong>Particle diameter (mm) for Sand, Silt &amp; Clay: Very
Coarse Sand (2.0 -1.0), Coarse Sand (1.0 - 0.5), Med. Sand (0.5 - 0.25),
Fine Sand (0.25 -0.1), Very Fine Sand (0.1 - 0.05), Silt (0.05 - 0.002)
and Clay (&lt; 0.002)</strong></p></li>
<li><p><strong>Cation Exchange Capacity (CEC) taken from the Western
Fertilizer Handbook, 2<sup>nd</sup> ED., 1995</strong></p></li>
</ul></td>
<td colspan="9"><ul>
<li><p><strong>Bulk Density (Ref. bulk density calculator @
Pedosphere.com)</strong></p></li>
<li><p><strong>Unavailable Water (Ref. Figure 1-9 of the National
Engineering Handbook; Section 15 – Irrigation)</strong></p></li>
<li><p><strong>Available Water (Ref. NRCS Salinity Management for Soil
&amp; Water; Table 5.1, page 5.10 )</strong></p></li>
<li><p><strong>FC = Field Capacity.</strong></p></li>
</ul></td>
</tr>
<tr class="even">
<td colspan="16"><blockquote>
<p><strong>NOTE: <u>Soil structure</u> is evaluated for its effect on
downward movement of water: Single grain (rapid), Granular (rapid),
Blocky (moderate), Prismatic (moderate), Platy (slow) and Massive
(slow). The <u>Soil Intake Family</u> (typically 0.1 thru 2.0) is used
in IWM field evaluations and irrigation system design. <u>Irrigation
Water Quality</u> (i.e., Electrical Conductivity of irrigation water
(ECiw ) in dS/m &amp; Sodium Adsorption Ratio (SAR)) is evaluated for
its potential detrimental effects on plant moisture availability and
water infiltration. rudy garcia 2008</strong></p>
</blockquote></td>
</tr>
</tbody>
</table>