BLocation of water table

The elevation and shape of the water table may vary throughout the year. High water tables and perched water tables in borrow areas can create access problems for heavy machinery. Rising water tables can also crack, split, and lift concrete slabs and rupture impoundment liners. The occurrence of a high water table may restrict the depth of excavation and require installation of relief or interceptor drainage systems to protect the practice from excessive uplift pressures.

Obtain preliminary estimates of the depth to high water table from published soil surveys and the NRCS National Soil Characterization data base. Site-specific ground water depths may vary from values given in these sources. Stabilized water levels observed in soil borings or test pits provide the most accurate determination in the field. Seasonal variations in the water table also may be inferred from the logs of borings or pits. Recording soil color and mottling is particularly important. Mottling indicates seasonal changes in soil moisture. Perennially saturated soil is typically gray. Perennially aerated soil is typically various shades of red, brown, or yellow.

25

- 40

15

- 30

25

- 40

10

- 30

35

- 50

5 -

10

45

- 55

1 -

10

25

- 55

5 -

15

10

- 35

10

- 25

5 -

50

5 -

50

0 -

10

0 -

10

0 -

1

0

5 -

50

5 -

50

5 -

30

5 -

15

1 -

20

0.5

- 5

0 -

10

0.5

- 5

Agricultural Waste Management Component ^

1. Waste empoundments

A. Earthfill embankment

B. Excavated cutbank

C. Clay liners

2. Waste storage structure (tanks and stacking facilities)

3. Vegetative filter strips

4. Waste utilization area (land application)

5. Constructed wetland

6. Composting facility

7. Waste transfer - (e.g., buried pipelines)

Agricultural Waste Management Component ^

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