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the field and 3 feet below the bottom of the trenches. . This system is similar to the flood dose system except that effluent is pumped to the effluent distribution lines under pressure, which provides more uniform distribution to each line. It is used in most at-grade, mound, and drip irrigation systems. is the usual method as described for the gravity flow trench. Effluent flows slowly by gravity to all lines of the absorption field when sewage enters a full septic tank. Effluent probably saturates the first part of a trench, but may never reach the end of it. • Pumps are required; they are not needed in gravity flow trenches. • Nutrients are added in the rooting zone of the original soil, so chemical fertilizer application to lawns can be reduced. • The amount of biomat formation is likely to be less because the rate of flow across this interface is smaller. • The interface area between the trench or slot and the soil is much greater. Fig 38. Arrangement of the components of a sand mound soil absorption system. Fig 37. Side view of the components of a septic tank and trench soil absorption system. Figure 36. Cross sections through one line of a soil absorption field in a sand mound, at-grade system, and gravity trench. A soil absorption field usually has several parallel lines . Fig

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