Nature and Severity of Imported Fire Ant (Hymenoptera: Formicidae) Infestations on the Mississippi River Levee

Each plot was further divided into three subplots; two extended down the slopes from the road edge atop the levee to the landside and riverside berms, and one was located atop the relatively flat area adjacent to the levee on the landside berm (Figure 2).
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Individual mound characteristics [mound volume (L), mound area (m2), and eccentricity] were regressed over location (landside slope, landside berm, or riverside slope) and point data for insolation by using Proc Mixed (Littell et al. 1996) with plot as a random effect. Imported fire ant density was expressed as cumulative above-ground mound volume ha-1 (L), and number of mounds ha-1. These two dependent variables, along with percent inactive mounds per plot, were log10-transformed to stabilize variance, and regressed over average insolation (per subplot) and location (landside slope, riverside slope, or landside berm) using Proc Mixed with plot as a random effect.

http://midsouthentomologist.org.msstate.edu/Volume2/Vol2_2_h...

Drainage Structures

Conduit that allows water to flow from landside to waterside of a levee during non-high water periods, while preventing backflow during high water stages.

http://midsouthentomologist.org.msstate.edu/Volume2/Vol2_2_h...


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Note added at 6 hrs (2017-07-12 23:00:46 GMT)
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Leeve cross-section:

http://midsouthentomologist.org.msstate.edu/Images/Vol2_2/vo...

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Note added at 6 hrs (2017-07-12 23:02:36 GMT)
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Rysunek 1. Schemat budowy wału przeciwpowodziowego
Oznaczenia użyte w schemacie: 1 – skarpa odwodna
2 – skarpa odpowietrzna
3 – korona wału
4 – ekran szczelny
5 – rdzeń szczelny
6 – uszczelnienie podłoża
7 – drenaż
8 – rów odwadniający

http://www.bzg.pl/node/942