NWWP92402100008 Attachment Soil Information.pdf

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Lake Charles, Louisiana, Area Existing Site

Rev. 0

United States Department of Agriculture

Soil Consen/ation Sen/ice

In cooperation with Louisiana Agricultural Experiment Station and the Louisiana Soil and Water Conservation Committee

Soil Survey of Calcasieu Parish, Louisiana

B-IO

138 Soil Survey eastern cottonwood and American sycamore, should be planted unless drainage is provided. Wetness severely limits equipment use and causes moderate seedling mortality.

This soil is poorly suited to recreational development.

The main limitations are wetness and very slow permeability. Flooding is a hazard. Adequate drainage should be provided for most recreational uses. Plant cover can be maintained by controlling traffic.

This soil is poorly suited to urban development. The main limitations are wetness, high shrink-swell potential, very slow permeability, and low strength for roads.

Flooding is a hazard. Drainage is needed if roads and building foundations are constructed. Designs for buildings and roads should offset the effects of shrinking and swelling. Very slow permeability and the high water table increase the possibility that septic tank absorption fields will fail.

This Midland soil is in capability subclass lllw and woodland group 2W.

Mr—Morey loam. This soil is level and poorly drained.

It is on broad flats on the Gulf Coast Prairies. Areas are irregular in shape and range from 40 to 1,400 acres. The landscape consists of broad flats that have small, convex mounds that make up from 5 to-25 percent of the areas. In places the mounds have been smoothed by mechanical means. The mounds are circular and range from 50 to 100 feet in diameter and 1 to 3 feet in height before being leveled. Slope is 0 to 1 percent.

Typically, the surface layer is very dark gray, slightly acid loam about 11 inches thick. The subsoil extends to a depth of about 60 inches. It is very dark gray, mottled, medium acid loam in the upper part; dark gray, mottled, medium acid and strongly acid clay loam in the middie part; and gray, mottled, medium acid clay loam in the lower part.

Included in this map unit are a few small areas of Judice, Leton, Midland, and Mowata soils. Judice and Midland soils are in lower positions than the Morey soil and have a more clayey subsoil. The Leton soils are in lower positions and have a lighter color surface layer than the Morey soil. Also included are many small areas of Vidrine soils. The somewhat poorly drained Vidrine soils are on the tops of the mounds and on smoothed mound areas and have a subsoil that is clayey in the lower part. The Vidrine soils make up from 5 to 10 percent of the map unit. .The Leton, Midland, and Mowata soils make up about 20 percent of the map unit.

This soil is moderately high in natural fertility. Water and air move through this soil slowly. Water runs off the surface slowly. A seasonal high water table fluctuates between a depth of 2 feet and the soil surface during December through February. The surface layer remains wet for long periods after heavy rain. This soil is subject to flooding during unusually severe rainstorms. Adequate water is available to plants in most years.

This soil is mainly used for cultivated crops. In a few areas, it is used as pastureland, woodland, or homesites.

This soil is moderately well suited to cultivated crops, mainly rice and soybeans. The main limitation is wetness. This soil is friable and easy to keep in good tilth. It can be worked throughout a wide range of moisture content (fig. 6). A tillage pan forms easily if this soil is tilled when wet, but chiseling or subsoiling can be used to break up the tillage pan. Land grading and smoothing improves surface drainage and permits more efficient use of farm equipment. Pipe or other drop structures installed in drainage ditches control the water level in rice fields and prevent excessive erosion of ditches. Maintaining crop residue on or near the surface reduces runoff and helps to maintain soil tilth and organic matter content. Most crops and pasture plants respond well to additions of fertilizer.

This soil is moderately well suited to pasture. Suitable pasture plants are common bermudagrass, Pensacola bahiagrass, ryegrass, winter peas, and white clover.

Land grading and smoothing can remove excess surface water. Proper grazing, weed control, and fertilizer are needed for maximum quality of forage.

The soil is well suited to slash pine and loblolly pine.

Wetness limits the use of equipment and causes severe seedling mortality.

This soil is poorly suited to recreational development.

The main limitation is wetness, and flooding is a hazard.

Good drainage should be provided for most recreational uses. Plant cover can be maintained by controlling traffic.

This soil is poorly suited to urban development.

Flooding is a hazard, and the main limitations are slow permeability, wetness, and low strength for roads.

Drainage is needed if roads and building foundations are constructed. Preserving the existing plant cover during construction helps to control erosion. Designs for roads should offset the limited ability of the soil to support a load. Septic tank absorption fields do not function properly during rainy periods because of wetness and slow permeability.

This Morey soil is in capability subclass lllw and

Mt—Mowata-Vldrlne silt loams. These soils are level, and poorly drained and somewhat poorly drained. They are on broad flats on the Gulf Coast Prairies. This complex consists of small areas of Mowata and Vidrine soils that are so intermingled that they cannot be mapped separately at the scale selected. Areas are irregular in shape and most range from 40 to 2,000 acres. A few areas are as large as 5,000 acres. The landscape consists of broad flats that have many small, convex mounds. Many of the mounds have been smoothed. The mounds are circular and range from 50 to 150 feet in diameter and 1 foot to 6 feet in height

B-11

Calcasieu Parish, Lou is iana 141 39

Figure 6.—Soybean stubble Is In the loreground In this area of Moray loam. A windbreak of stash pine stands In the background.

before leveling. Most areas have been leveled and have a slope of 0 to 1 percent.

The mapped areas have about 60 percent Mowata soil and about 30 percent Vidrine soil. The Mowrata soil is in the intermound areas and the Vidrine soil is on the mounds or smoothed mound areas.

The Mowata soil is poorly drained and has a surface layer of dark grayish brown, very strongly acid silt loam about 6 inches thick. The subsurface layer is gray, strongly acid silt loam about 15 inches thick. The subsoil extends to a depth of about 60 inches. It is gray, mottled, strongly acid silty clay and silt loam in the upper part; gray, mottled, strongly acid silty clay in the middle part; and light brownish gray, mottled, slightly acid silty clay loam in the lower part.

This Mowata soil is medium in natural fertility. Water and air move through it very slowly. Water runs off the surface very slowly and stands in low places for short periods after heavy rain. A seasonal high water table fluctuates between a depth of 2 feet and the soil surface during December through April. The surface layer remains wet for long periods after heavy rain. Plants are damaged by lack of water during dry periods in summer and fall of some years. The soil has high shrink-swell potential.

The Vidrine soil is somewhat poorly drained and has a surface layer of dark grayish brown, medium acid silt loam about 6 inches thick. The subsoil extends to a depth of about 74 inches. It is light yellowish brown, very strongly acid silt loam in the upper part; grayish brown, mottled, strongly acid siity clay in the middie part; and light brownish gray, mottled, medium acid to miidly alkaline silty clay loam in the lower part.

This Vidrine soii has medium fertility and is high in exchangeable aluminum levels that are potentially toxic to most crops. Water and air move through this soil slowly. Water runs off the surface at a medium rate. The surface layer remains wet for long periods after heavy rain. A seasonal high water table is 1 foot to 2 feet below the>surface during December through April.

Included in this map unit are a few small areas of Crowley, Leton, Midland, and Moray soils. The Crowley soils are somewhat poorly drained and are on convex ridges. They have an abrupt change in texture from the

B-12 surface layer to the subsoil. The Leton soils are in low positions and are loamy throughout. The Midland soils are in low positions and are similar to the Mowata soil, except that they do not have a subsurface layer that tongues into the subsoil. The Morey soils are in positions similar to those of the Mowata soil, and they have a darker surface layer. Also included are small areas of Vidrine soils on mounds that have slopes of from 1 to 3 percent. The included soils make up about 15 percent of the map unit.

Most areas of this map unit are used for cultivated crops. A few areas are used as pasture, woodland, or homesites.

This unit is moderately well suited to cultivated crops, mainly rice and soybeans. The main limitation is wetness. These soils are friable, but they are somewhat difficult to keep in good tilth because of surface crusting.

A tillage pan forms easily if this soil is tilled when wet, but chiseling or subsoiling can break up the tillage pan.

A drainage system is needed for most cultivated crops and pasture plants. Land grading and smoothing improves surface drainage and permits more efficient use of farm equipment. Pipe or other drop structures installed in drainage ditches control the water level in rice fields and prevent excessive erosion of ditches. The organic matter content can be maintained by using all crop residue, plowing under cover crops, and using a suitable cropping system. Most crops and pasture plants respond well to additions of fertilizer and lime that are formulated and systematically applied to overcome the medium fertility and high levels of exchangeable aluminum.

This map unit is moderately well suited to pasture. The main limitation is wetness. Suitable pasture plants are common bermudagrass, Pensacola bahiagrass, ryegrass, winter peas, and white clover. Grazing when the soil is wet compacts the surface layer. Proper grazing, weed control, and fertilizer are needed for maximum quality of forage.

This map unit is well suited to slash pine and loblolly pine. Wetness severely limits the use of equipment and causes slight to moderate seedling mortality.

This map unit is poorly suited to recreational development. The main limitations are wetness and slow and very slow permeability. Good drainage should be provided for most recreational uses. Plant cover can be maintained by controlling traffic.

This map unit is poorly suited to urban development.

The main limitations are wetness, high shrink-swell potential, slow and very slow permeability, and low strength for roads. Drainage is needed for best results with most lawn grasses, shade trees, ornamental trees, shrubs, vines, and vegetable gardens. Designs for roads should offset the limited ability of the soil to support a load. Designs for buildings and roads should offset the effects of shrinking and swelling. Very slow and slow permeability and the high water table increase the possibility that septic tank absorption fields will fail.

This map unit is in capability subclass lllw and

Pt—Pits, sand. This map unit consists of excavations from which soil and geologic material have been removed, mainly for use in road construction. Pits generally range from 2 to 60 acres.

Included in mapping with pits are a few small areas of spoil material, mostly mixtures of loamy and clayey material, that have been piled or scattered around the edges of the pits. Also included are small bodies of shallow water. The included areas make up about 10 percent of the map unit.

Pits are generally not suited to agricultural, forestry, or urban uses. Abandoned pits can produce habitat for rabbits and other small game animals when left undisturbed.

UA—Udifluvents, 1 to 20 percent slopes. This map unit consists of sandy to clayey soil material that has been excavated from other places during the construction and maintenance of navigable watenways.

These soils have no identifiable soil layers. They are variable in texture and slope. Areas range from irregular in shape to long and narrow and are from 20 to several hundred acres. Relief ranges from about 1 foot to 15 feet. The observations were fewer than in most other areas because of poor accessibility. The detail in mapping, however, is adequate for the expected use of the soil. Slopes are short and choppy and range from 1 to 20 percent.

Included with these soils in mapping are a few large areas of Aquents and a few small areas of Gentilly soils.

The poorly drained Aquents and very poorly drained Gentilly soils are in lower positions and are more saline throughout. Also included are a few small areas that contain chemical wastes from industrial plants. The included areas make up about 15 percent of the map unit.

These soils are medium in natural fertility. They are moderately well drained to poorly drained. Vi/ater and air move through these soils at a very slow to moderate rate. Water runs off the surface at a slow to rapid rate.

The depth to the high water table is variable.

The natural vegetation consists mainly of rattlebox, ragweed, eastern baccharis, and common bermudagrass. Some areas along the intracoastal waterway are wooded. The major trees are hackberry, willow, and Chinese tallow.

Most of the acreage is used as habitat for wildlife and for industrial development. A small acreage is in pasture or woodland.

This soil is moderately well suited to use as habitat for rabbits, deer, and furbearers such as muskrat, nutria, raccoons, and mink.

B-13

Calcasieu Parish, Louisiana 141

Mowata Series The Mowata series consists of poorly drained, very slowly permeable soils on broad flats and along drainageways on the Gulf Coast Prairies. These soils formed in clayey alluvium of Pleistocene age. Slopes are less than 1 percent.

Soils of the Mowata series are fine, montmorillonitic, thermic Typic Glossaqualfs.

Mowata soils commonly are near Crowley, Judice, Leton, Midland, Morey, and Vidrine soils. Crowley soils are on the higher convex ridges and have an abrupt textural change from the E horizon to the Btg horizon.

Judice and Leton soils are in lower positions on the landscape than Mowata soils. In addition, Judice soils have a mollic epipedon, and Leton soils have a fine-silty control section. Midland soils are in slightly lower positions than Mowata soils. These soils do not have a subsurface layer that has tongues extending into the subsoil. Morey soils are in similar positions as Mowata soils. These soils have a mollic epipedon. Vidrine soils are on mounds. These soils have a coarse-silty over clayey control section.

Typical pedon of Mowata silt loam, in an area of Mowata-Vidrine silt loams; 3 miles west of Iowa, 0.2 miles south of U.S. Highway 190, 105 feet south of a dirt road; NW1/4NW1/4 sec. 34, T. 9 8., R. 7 W.

Ap—0 to 6 inches; dark grayish brown (1OYR 4/2) silt loam; weak fine granular structure; friable; common fine roots; strong brown oxidation stains along root channels; very strongly acid; abrupt smooth boundary.

Eg—6 to 21 inches; gray (10YR 5/1) silt loam; few fine faint light brownish gray mottles; weak medium subangular blocky structure; friable; few fine roots;

few fine discontinuous tubular pores; strong brown oxidation stains along root channels and some ped faces; strongly acid; abrupt irregular boundary.

B/E—21 to 34 inches; gray (10YR 5/1) silty clay; many coarse distinct strong brown (7.5YR 5/8) mottles;

few fine faint light brownish gray mottles; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; few fine roots; thick continuous dark gray clay films on faces of peds;

about 20 percent tongues of gray (10YR 6/1) silt loam (E) to a depth of 32 inches; few fine dark concretions; strongly acid; clear wavy boundary.

Btgl—34 to 45 inches; gray (10YR 6/1) silty clay; many coarse distinct strong brown (7.5YR 5/8) motties;

moderate coarse and medium subangular blocky structure; firm; few fine roots; thick discontinuous clay films on faces of peds; few slickensides 5 to 15 centimeters long in lower part; few fine and medium dark concretions; strongly acid; gradual wavy

Bfg2—45 to 60 inches; light brownish gray (2.5Y 6/2) silty clay loam; many medium distinct yellowish brown (10YR 5/8) mottles; few medium faint gray (10YR 5/1) mottles; weak medium subangular blocky structure; firm; thin patchy clay films on faces of peds; common medium and coarse dark concretions; few fine barite crystals; slightly acid.

The solum is 40 to 60 inches thick.

The A horizon has hue of 10YR, value of 3 to 5, and chroma of 1 or 2. It is 4 to 8 inches thick. If moist values are less than 3.5, the A horizon is less than 6 inches thick. Reaction is very strongly acid or strongly acid.

The Eg horizon has hue of 10YR, value of 5 or 6, and chroma of 1 or 2. It is 9 to 15 inches thick. Reaction is very strongly acid or strongly acid.

The Btg horizon has hue of 10YR, 2.5Y, or 5Y, value of 5 or 6, and chroma of 1 or 2. Surfaces of peds are dark gray or gray. Texture is silty clay, silty clay loam, or clay loam. Mottles are in shades of brown or yellow.

Reaction is strongly acid to moderately alkaline. Tongues of silt loam extend deep into the Btg horizon and are 0.5 inch to 8 inches wide.

The Mowata soils in Calcasieu Parish are taxadjuncts to the Mowata series because they have A and Eg horizons that are very strongly acid or strongly acid. The Mowata series has A and E horizons that are medium acid to neutral. This difference, however, does not affect the use and management of the soils.

Una Series The Una series consists of poorly drained, very slowly permeable soils on 1lood plains. These soils formed in loamy alluvium. Slopes are less than 1 percent.

Soils of the Una series are fine, mixed, acid, thermic Typic Haplaquepts.

Una soils commonly are near Barbary and Guyton soils. Barbary soils are very poorly drained and are in lower positions on the landscape than Una soils. These soils are very fluid. Guyton soils are poorly drained and are in slightly higher positions than Una soils. These soils have a fine-silty control section.

Typical pedon of Una silty clay loam, frequently flooded; 4 miles west of Starks on Louisiana State Highway 12, 0.7 mile east of Sabine River bridge, 250 feet south of Louisiana State Highway 12, 65 feet north of a borrow pit; NE1/4SW1/4 sec. 6, T. 9 S., R. 13 W.

A — 0 to 5 inches; dark grayish brown (10YR 4/2) silty clay loam; weak medium granular structure; firm;

many medium and coarse roots; very strongly acid;

clear smooth boundary.

Bg,1—5 to 17 inches; light brownish gray (10YR 6/2) clay loam; many medium distinct yellowish brown (10YR 5/4) mottles; weak coarse angular blocky structure;

firm; common fine roots; thin patchy clay films on vertical faces of peds; very strongly acid; gradual wavy boundary.

B-14

Bg2—17 to 31 inches; light brownish gray (10YR 6/2) clay loam; many medium distinct dark yellowish brown (10YR 4/4) mottles; weak medium subangular biocky structure; firm; few fine roots; thin patchy clay films on faces of peds; few fine blacK accumulations; very strongly acid; gradual wavy

BgS—31 to 45 inches; gray (10YR 6/1) silty clay loam;

many medium distinct dark yellowish brown (10YR 4/4) mottles; weak medium subangular biocky structure; firm; few fine roots; thin patchy clay films on faces of peds; few fine black accumulations; very strongly acid; gradual wavy boundary.

Bg4—45 to 65 inches; gray (10YR 6/1) clay loam; many medium distinct dark yellowish brown (10YR 4/4) mottles; weak medium subangular biocky structure;

firm; few fine roots; thin patchy clay films on faces of peds; very strongly acid.

The solum is more than 60 inches thick. Reaction is very strongly acid or strongly acid throughout. The effective cation-exchange capacity has 20 to 50 percent exchangeable aluminum in the control section to a depth of 30 inches or more.

The A horizon has hue of 10YR, value of 4 or 5, and chroma of 1 or 2. It is 4 to 6 inches thick.

The Bg horizon has hue of 10YR, 2.5Y, or 5Y, value of 5, and chroma of 1; or hue of 10YR, 2.5Y, or 5Y, value of 6, and chroma of 1 or 2. Texture is silty clay loam or clay loam. Mottles are in shades of brown or yellow.

The Una soils in Calcasieu Parish are taxadjuncts to the Una series because they have a fine-silty particie-size control section. The Una series has a fine particle-size control section. This difference, however, does not affect the use and management of the soils.

Urbo Series The Urbo series consists of somewhat poorly drained, very slowly permeable soils on flood plains. These soils formed in clayey alluvium. Slopes are less than 1 percent.

Soils of the Urbo series are fine, mixed, acid, thermic Aerie Haplaquepts.

Urbo soils commonly are near Acadia, Guyton, Kinder, and Messer soils. Acadia soils are somewhat poorly drained and are on side slopes. These soils have an argillic horizon. Guyton soils are poorly drained and are in similar positions on the landscape as Urbo soils.

Guyton soils have a fine-silty control section. Kinder soils are poorly drained and are in higher positions than Urbo soils. Kinder soils have a fine-silty control section.

Messer soils are moderately well drained. These soils are on mounds. They have a coarse-silty control section.

Typical pedon of Urbo silty clay loam, occasionally flooded; 4 miles south of Starks, 300 feet southwest of a road; NW1/4SE1/4 sec. 23, T. 9 S., R. 13 W.

A — 0 to 4 inches; dark grayish brown (10YR 4/2) silty clay loam; common dark brown oxidation stains along root channels; weak medium subangular biocky structure; friable; many medium and fine roots; very strongly acid; clear wavy boundary.

B g l — 4 to 21 inches; grayish brown (10YR 5/2) silty clay; many coarse distinct dark yellowish brown (10YR 4/6) mottles; moderate medium subangular biocky structure; firm; common medium and fine roots; very strongly acid; gradual wavy boundary.

Bg2—21 to 48 inches; light brownish gray (10YR 6/2) silty clay; many coarse distinct dark yellowish brown (10YR 4/6) mottles; weak medium subangular biocky structure; firm; few fine roots; few non-intersecting slickensides; very strongly acid; gradual

Bg3—48 to 60 inches; gray (10YR 6/1) silty clay; many medium distinct yellowish brown (10YR 5/6) mottles;

weak medium subangular biocky structure; firm; few slickensides; very strongly acid.

The solum is more than 60 inches thick. Reaction is very strongly acid or strongly acid throughout. The effective cation-exchange capacity of the soil has 20 to 50 percent exchangeable aluminum in the control section to a depth of 30 inches or more.

The A horizon has hue of 10YR, value of 4 or 5, and chroma of 2. It is 4 to 8 inches thick.

The Bgl horizon has hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 2. Texture is silty clay loam, clay loam, silty clay, or clay. Mottles in shades of brown range from few to many. The Bg2 and Bg3 horizons have hue of 10YR or 2.5Y, value of 5 to 7, and chroma of 1 or 2. Texture is silty clay loam, clay loam, silty clay, or clay. Mottles in shades of brown range from few to many.

Vidrine Series The Vidrine series consists of somewhat poorly drained, slowly permeable soils on low mounds on broad flats and on side slopes on the Gulf Coast Prairies.

These soils formed in clayey alluvium of late Pleistocene age. Slopes range from 0 to 3 percent.

Soils of the Vidrine series are coarse-silty over clayey, mixed, thermic Glossaquic Hapludalfs.

Vidrine soils commonly are near Crowley, Kinder, Leton, Morey, and Mowata soils. The associated soils are in the intermound areas. Crowley soils are somewhat poorly drained and have a fine control section. Mowata soils are poorly drained and also have a fine control section. Kinder, Leton, and Morey soils are poorly drained. These soils have a fine-silty control section.

Typical pedon of Vidrine silt loam, in an area of Crowley-Vidrine silt loams; 2.5 miles northeast of Holmwood, 140 feet north of Louisiana State Highway 14; SE1/4SW1/4 sec. 20, T. 10 8., R. 7 W.

B-15

Apl—0 to 4 Inches; dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; friable; common fine roots; strongly acid; abrupt smooth boundary.

Ap2—4 to 8 Inches; dark grayish brown (10YR 4/2) silt loam; few streaks of yellowish brown silt loam;

massive; firm; few fine roots; strongly acid; abrupt

BA—8 to 20 Inches; yellowish brown (1QYR 5/4) silt loam; few medium faint yellowish brown (10YR 5/6) mottles; weak medium subangular blocky structure;

friable; few fine roots; common medium tubular pores; common medium black and brown accumulations; strongly acid; clear Irregular

B/E—20 to 23 Inches; brown (10YR 5/3) sllty clay loam (Bt); many coarse prominent red (2.5YR 4/8) mottles; moderate medium subangular blocky structure; firm; pale brown (10YR 6/3) silt coatings about 1 to 5 millimeters thick on faces of peds (E);

medium acid; clear wavy boundary.

Btgl—23 to 39 Inches; grayish brown (lOYR 5/2) sllty clay; many coarse prominent red (2.5YR 4/8) mottles; few medium distinct yellowish brown (10YR 5/6) mottles; moderate medium subangular blocky structure parting to moderate fine subangular blocky;

firm; thick continuous clay films on faces of peds;

medium acid; gradual wavy boundary.

Btg2—39 to 51 Inches; light brownish gray {10YR 6/2) sllty clay; many coarse prominent red (2.5YR 4/8) and common medium distinct yellowish brown (10YR 5/6) mottles; moderate medium subangular blocky structure; firm; thick discontinuous clay films on faces of peds; slightly acid; gradual wavy

Btg3—51 to 60 Inches; light brownish gray (10YR 6/2) sllty clay loam; common medium prominent red (2.5YR 4/8) mottles; common medium distinct yellowish brown (10YR 5/6) mottles; weak medium subangular blocky structure; firm; slightly acid;

gradual wavy boundary.

The solum Is 48 to 80 Inches thick. Combined thickness of the A and BA horizons ranges from 14 to 22 Inches If mounds are smoothed and ranges from 20 to 36 Inches In the natural state. The effective cation-exchange capacity has 50 percent or more exchangeable aluminum In the control section to a depth of 30 Inches or more.

The Ap horizon has hue of 10YR, value of 3 to 5, and chroma of 2 or 3. It Is 5 to 12 Inches thick. An Ap horizon that has a value of 3 Is less than 6 Inches thick.

Reaction Is very strongly acid to medium acid.

The BA horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Texture Is silt loam or very fine sandy loam. Reaction is very strongly acid to medium acid.

The Btg horizon has hue of lOYR, value of 4 to 6, and chroma of 1 or 2. Texture Is sllty clay loam or sllty clay.

Mottles In shades of red or brown range from few to many. Reaction Is very strongly acid to medium acid In the upper part of the Btg horizon, and medium acid to moderately alkaline in the lower part. In some pedons, carbonate concretions are In the lower part of the Btg horizon.

Some pedons have a BCg horizon. It has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 1 to 6. Texture Is sllty clay loam, sllty clay, or silt loam. Reaction Is slightly acid to moderately alkaline.

B-16

TABLE lO.—SniLDING SITE DEVELOPMENT—Continued

Map symbol and soil name

Shallow excavations

Mt:

Mowata-

Vidrine-

Pt.

Pits

UA.

Udifluvents

UN

Una

Up.

Urban land

Ur Urbo

Vn Vidrine

Severe:

wetness.

Dwellings without basements wetness, shrink-swell.

flooding, Small commercial buildings

Local roads and streets low strength, flooding.

Lawns and landscaping

Moderate:

B-17

TABLE 12,--CONSTRUCTION HATERIALS—Continued

Hap symbol and

Roadfill Sand Gravel Topsoll

LE

Larose

Lt Leton

Mb Malbis

Mg Messer

Mb:

Messer-'

Guyton-

Mn Midland

Mr Morey

Ht:

Mowata-

Poor:

Fair:

low strength.

OA.

U N—

Up.

Ur lAi improbable:

excess fines.

Improbable:

! excess fines.

too clayey, excess humus, Good.

thin layer, thin layer, thin layer.

Fair:

too clayey.

thin layer.

B-18

TABLE 13.—HATER MANAGEMENT—Continued

Liinitations for— Map symbol and

FoHa reservoir areas

Embankments, dikes, and levees

Aquifer-fed excavated ponds

Features affrcting—

Drainage Irrigation Terraces and diversions

LE

Larose

Lt Leton

Mb Halbis

Hg Hesser

Mb:

Hesser-

Guyton-

Hn Midland

Mr Horey

Mt:

Howata-

UA.

tm— np.

Or

Vn

Slight-seepage.

Slight excess humus, hard to pack, ponding.

piping.

piping, Slight slow refill.

no water.

I Severe:

Severe, no water

Peres slowly, subsides.

Peres slowly—

Deep to water slope.

Slow intake, percs slowly, Wetness, percs slowly.

Favorable— erodes easily.

Ponding, Erodes easily, Favorable.

percs slowly, wetness.

Erodes easily.

erodes easily. percs slowly.

Wetness, Erodes easily, percs slowly, j wetness, B-19

CALCASIEU PARISH, LOUISIANA - SHEET NUMBER 69

•it. 'V • -i • -i

I

" ' Twt"T'T m w tb

NATIONAL FLOOD INSURANCE P R O G R A M

FIRM

FLOOD INSURANCE RATE MAP

CALCASIEU PARISH,

LOUISIANA

UNINCORPORATED AREAS

PANEL 5 7 5 OF 6 2 5

(SEE MAP I N D E X FOR PANELS NOT P R I N T E D )

C O M M U N I T Y - P A N E L N U M B E R 2 2 0 0 3 7 0 5 7 5 B

M A P R E V I S E D :

JANUARY 1 5 . 1 9 8 8

Federal Emergency Management Agency y

KEY TO MAP

5 0 0 - Y e a r F lood B o u n d a r y

100-Year F l o o d B o u n d a r y

Z o n e Des igna t ions*

100-Year F l o o d B o u n d a r y

500-Yea r F l o o d B o u n d a r y

Base F l o o d Elevat ion Line With Elevat ion in F e e t * *

Base F l o o d Elevat ion in Fee t Where U n i f o r m Within Z o n e * '

Elevat ion R e f e r e n c e Mark

Zone D B o u n d a r y

River Mile P M I . S

• • R e f e r e n c e d t o the Nat ional Geode t i c Vert ical D a t u m of 1 9 2 9

-513-

(EL 987)

RM7x

•EXPLANATION OF ZONE DESIGNATIONS

ZONE E X P L A N A T I O N

A Areas of 100-year f l o o d ; base f lood e leva t ions and f l ood hazard fac tors n o t d e t e r m i n e d .

AO Areas of 100-year shal low f lood ing where d e p t h s are b e t w e e n one (1) and th ree (3) f e e t ; average d e p t h s of i n u n d a t i o n are s h o w n , h u t n o f l ood hazard f a c t o r s are d e t e r m i n e d .

AH Areas of 100-year shallow f lood ing where d e p t h s are b e t w e e n one (1) and th ree (3) f e e t ; base f l ood e leva t ions are s h o w n , h u t n o f lood hazard f ac to r s are d e t e r m i n e d .

A 1 - A 3 0 Areas of 100-year f l o o d ; base f l ood e leva t ions and f l o o d hazard fac tors d e t e r m i n e d .

A99 Areas of 100-year f lood to he p r o t e c t e d by f l o o d p r o t e c t i o n system u n d e r c o n s t r u c t i o n ; base f lood e leva t ions and f lood hazard f ac to r s n o t d e t e r m i n e d .

B Areas be tween limits of the 100-year f lood and 5 0 0 -year f l o o d ; or certain areas sub jec t to i 0 0 - y e a r f l o o d -ing with average d e p t h s less t h a n one (1) f o o t o r where t h e c o n t r i b u t i n g drainage area is less t h a n o n e square mi le ; o r areas p ro tec ted b y levees f r o m t h e base f l o o d .

(Medium shading)

C Areas of minimal f looding . (No shading)

D Areas of u n d e t e r m i n e d , h u t poss ible , f lood hazards .

V Areas of 100-year coastal f l ood with ve loc i ty (wave ac t i on ) ; base f lood e levat ions and f lood hazard f a c t o r s n o t d e t e r m i n e d .

V 1 V 3 0 Areas of 100-year coastal f lood with veloci ty (wave a c t i o n ) ; base f lood e levat ions and f l ood hazard f a c t o r s d e t e r m i n e d .

N O T E S T O U S E R

Certain areas n o t in t h e special f l o o d hazard areas (zones A and V) may he p r o t e c t e d by f l ood c o n t r o l s t r u c t u r e s .

This map is for use in auministBring the National Flood Insurance Program; it does not necessarily identify all areas subject to flooding, panicularily from local drainage sources of small size, or all planimetrie features outside sr>ecial flood hazard areas. The coastal flooding elevations shown may differ significantly from those develofred by the National Weather Service for hurricane evacuation planning.

For ad jo in ing m a p pane ls , see separa te ly pr in ted Index To Map Panels.

Coastal base f l o o d e leva t ions s h o w n o n this m a p include the e f f e c t s of wave a c t i o n .

Coastal base f lood e leva t ions app ly o n l y l andward of 0 .0 N G V D .

I N I T I A L I D E N T I F I C A T I O N :

SEPTEMBER 13. 1974

F L O O D H A Z A R D B O U N D A R Y MAP R E V I S I O N S :

NONE

F L O O D I N S U R A N C E R A T E MAP E F F E C T I V E :

SEPTEMBER 29. 1978

F L O O D I N S U R A N C E R A T E MAP R E V I S I O N S :

January 15. 1988 — to change base flood elevations, to add special flood hazarrf areas, and to inctude the effects of wave action irr en n V p

To de t e rmine if f l ood insurance Is available In this c o m m u n i t y , contac t y o u r Insurance agen t , or call the Nat ional F lood Insurance Program, at ( 800 ) 6 3 8 - 6 5 2 0 .

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APPROXIMATE SCALE

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F. Topography and Geographic Coordinates

The geographic coordinates of the NEXRAD tower are: latitude = 30° 07' 30" N;

longitude = 93° 12' 56" W {North American Datum, 1927).' Existing ground elevation is approximately 11 ft. The base of the radar tower will be 13 ft above MSL.

The site description is as follows: A 300- x 610-ft parcel located on Lake Charles Regional Airport property in the SEl/4 SEl/4 of Section 6, T. 11 S., R. 8 W., Louisiana Meridian, Calcasieu Parish, Louisiana.

G. Soils

Soils at the site are Mowata-Vidrine silt loams. The soils at the site appear to have been disturbed by agriculture and landscaping. Mowata-Vidrine soil has high shrink-swell potential. Designs for structures and driveways should offset the effects of shrinking and swelling. See Appendix B for additional soils information.

No known landfills or other waste sites exist on or adjacent to the proposed site; the site is undeveloped and has not been utilized by the airport (Alan Kratzer, personal communication, July 1993).

H. Floodplain

The proposed site is not within a 100-year floodplain [FEMA Flood Insurance Rate Map (FIRM) of Calcasieu Parish, Louisiana, Unincorporated Areas, Panel 575 of 625, Community-Panel Number 220037 0575 B (January 15, 1988)] (also see Appendk B).

However, the site is within a "short-term flooding" area, where the flooding is due to intense rain over a short period of time, and not due to backup water (Clay Midkiff, personal communication, July 1992). Therefore, it is recommended that all foundations be built up in order to protect structures from these short-term flooding events.

Driveways and parking areas also should be built up above the existing grade.

I. Seismic Zone

The Lake Charles, Louisiana, area is classified Zone 0, no damage. Zones range from 0 to 4, with 0 indicating that the area has no potential for damage, and 4 indicating the area has a potential for great damage.^

Equivalent to Latitude: 30° QT 31" N; Longitude: 93° 12' 57" W {North American Datum, 1983).

^"General Design Requirements, Earthquake Regulations, Seismic Zones," International Conference of Building Officials, Uniform Building Code (May 1991).

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