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<br /> <br />i~ <br />-~ <br />Photo o. Installation <br />of filter fabric, grain <br />pipe and drain gravel in <br />subsurface grain trencn. <br />Photo 7. Subsurface drainage trench filled with gravel, <br />filter fabric being lapped and covered witn gravel. <br /> <br />JCB NO 3003 <br />