HomeMy WebLinkAbout20060039.tiff soil survey of
Weld County, Colorado
Southern Part
United States Department of Agriculture
Soil Conservation Service
in cooperation with
Colorado Agricultural Experiment Station
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2006-0039
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38 r SOIL SURVEY
ars. As range condition deteriorates, a blue grama-buf- Closely spaced contour ditches can be used in irrigating
fa rass sod forms. Undesirable weeds and annuals - close grown crops. Contour furrows should be used for
vad the site as range condition becomes poorer. row crops. Applications of barnyard manure and commer-
Ma gement of vegetation on this soil should be ased cial fertilizer help to maintain good production. Keeping
on takt half and leaving half of the total annual roduc- tillage to a minimum and utilizing crop residue are impor-
r- tion. Ra e pitting can reduce runoff. Seeding is esirable tant.
if the ra e is in poor condition. Western eatgrass, The potential native vegetation is dominated by
blue gram sideoats grama, buffalogras pubescent western wheatgrass and blue grama. Buffalograss is also
wheatgrass, a d crested wheatgrass are sui le for seed- present. Potential production ranges from 1,000 pounds
ing. The grass lected should meet the s sonal require- per acre in favorable years to 600 pounds in unfavorable
ments of livest . It can be seeded i o a clean, firm years. As range condition deteriorates, a blue grama-buf-
sorghum stubble, it can be drilled i o a firm prepared falograss sod forms. Undesirable weeds and annuals in-
seedbed. Seeding ea y in spring has oven most success- vade the site as range condition becomes poorer.
ful. Management of vegetation on this soil should be based
Windbreak and envi nmental antings are generally on taking half and leaving half of the total annual produc-
not suited to this soil. site i estigation is needed to tion. Range pitting can reduce runoff. Seeding is desirable
determine if plantings are as' le. Supplemental water is if the range is in poor condition. Western wheatgrass,
needed for successful planti blue grama, sideoats grama, buffalograss, pubescent
Wildlife is an important ndary use of this soil. The wheatgrass, and crested wheatgrass are suitable for seed-
ing. The grass selected should meet the seasonal require-
cropland areas provide f ora habitat for ring-necked
ments of livestock. It can be seeded into a clean, firm
pheasant and mourning ove. M y nongame species can
be attracted by establ. ing areas or nesting and escape sorghum stubble, or it can be drilled into a firm prepared
seedbed. Seeding early in spring has proven most success-
cover. For pheasant, ndisturbed n ting is essential and
should be included ' plans for habita evelopment, espe- ful.
cially in areas of i ensive agriculture. ngeland wildlife, Windbreaks and environmental plantings are generally
for example, th ronghorn antelope, ca be attracted by not suited to this soil. Onsite investigation is needed to
developing I estock watering facility managing determine if plantings are feasible. Supplemental water is
livestock gra ng, and reseeding where need needed for successful plantings.
Wildlife is an important secondary use of this soil. The
This soil as poor potential for urban us and only
cropland areas provide favorable habitat for ring-necked
moderate potential for recreational develop nt. The
chief li ting features are the underlying shale, he low pheasant and mourning dove. Many nongame species can
ese be attracted by establishing areas for nesting and escape
stren , and the moderate to high shrink swell. hese
es present severe problems in dwelling and ese cover. For pheasants, undisturbed nesting cover is essen-
oad
tial and should be included in plans for habitat develop-
co ruction and in use of septic tank absorption fi ds
gat ment, especially in areas of intensive agriculture. Range-
a sewage lagoons. Capability subclass Ills irri land wildlife, for example, the pronghorn antelope, can be
attracted by developing livestock watering facilities,
57—Renohill clay loam, 3 to 9
percent slopes. This is managing livestock grazing, and reseeding where needed.
a moderately deep, well drained soil on upland hills and
This soil has poor potential for urban and recreational
ridges at elevations of 4,850 to 5.200 feet. It formed in
residuum from shale. Included in mapping are small areas development. The chief limiting features are the underly-
residuum ing shale, the low strength, and the moderate to high
of soils that have shale deeper than 40 inches. shrink swell. These features present severe problems in
Typically the surface layer is grayish brown clay loam dwelling and road construction and in use of septic tank
about 9 inches thick. The subsoil is grayish brown and absorption fields and sewage lagoons. Capability subclass
pale brown clay loam about 12 inches thick. The sub-) IVe irrigated, Vie nonirri ated; Clayey Plains range site. t
stratum is pale brown clay loam. Shale is at a depth of 58—Shingle loam, 1 to about 29 inches. percent slopes. This is a s
low, ell drained soil on plains at elevations of to
Permeability is slow. Available water capacity is 5,200 fe t formed in residuum from shale eluded in
moderate. The effective rooting depth is 20 to 40 inches. mapping are a small areas of shale a andstone out-
Surface runoff is medium to rapid, and the erosion hazard crops.
is moderate.
in Intensive Typically the surfa yer is yish brown loam about
This soil is suited to limited cropping.g 6 inches thick. The unde material is light yellowish
cropping is hazardous because of erosion. The cropping brown clay loam. Shal ' at a th of about 18 inches.
system should be limited to such close grown crops as al- Permeability i derate. Avai e water capacity is
falfa, wheat, and barley. The soil also is suited to ir- low. The eff e rooting depth is 1 20 inches. Sur-
rigated pasture. A suitable cropping system is 3 to 4 face ru s medium, and the erosion hazes 's low.
years of alfalfa followed by 2 years of corn and small ' soil is suited only to limited cro in grain and alfalfa seeded with a nurse crop. PP g unable
P. cr pping system is 3 to 4 years of alfalfa and 2 ye of
r
1
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•
WELD COUNTY, COLORADO, SOUTHERN PART 43
•
1" •stock and wildlife share the range. Livestock wateri ing. The grass selected should meet the seasonal require-
face also are utilized by various wildlife speci•• e ments of livestock. It can be seeded into a clean, firm
cropland a provide favorable habitat for ." "sant and sorghum stubble, or it can be drilled into a firm prepared
mourning dove. - y nongame species be attracted seedbed. Seeding early in spring has proven most success-
by establishing areas nesting a.• •scape cover. ful.
The underlying shale is - " ost limiting feature of Windbreaks and environmental plantings of trees and
this soil. Neither septic abs. ion fields nor sewage shrubs commmonly grown in the area are generally well
lagoons function ."..erly. In places nderlying shale suited to this soil. Cultivation to control competing
has high sh -swell potential. Environme and beau- vegetation should be continued for as many years as
ci;icati.• . antings of trees and shrubs can be u ' It to possible following planting. Trees that are best suited and
• .. ish. Capability subclass IVe irrigated, VIe no . have good survival are Rocky Mountain juniper, eastern
--- - - edcedar, ponderosa pine, Siberian elm, Russian-olive, and
66—Ulm clay loam, 0 to 3 percent slopes. This is a hackben•y. The shrubs best suited are skunkbush sumac,
deep, well drained soil on plains at elevations of 5,075 to lilac, Siberian peashrub, and American plum.
5,200 feet. It formed in alluvial and eolian sediments from Wildlife is an important secondary use of this soil. The
shale. Included in mapping are small areas of soils that cropland areas provide favorable habitat for ring-necked
have shale between 40 and 60 inches. Also included are pheasant and mourning dove. Many nongame species can
small areas of soils where the surface layer and subsoil be attracted by establishing areas for nesting and escape
have been recharged with lime from irrigation. cover. For pheasants, undisturbed nesting cover is essen-
Typically the surface layer of this Ulm soil is brown tial and should be included in plans for habitat develop-
clay loam about 5 inches thick. The subsoil is brown and ment. especially in areas of intensive agriculture. Range-
pale brown clay about 14 inches thick. The substratum to land wildlife, for example, the pronghorn antelope, can be
a depth of 60 inches is clay and clay loam. attracted by developing livestock watering facilities,
Permeability is slow. Available water capacity is high. managing livestock grazing, and reseeding where needed.
The effective rooting depth is 60 inches or more. Surface This soil has poor potential for urban and recreational
runoff is medium, and the erosion hazard is low. development. Slow permeability and high shrink swell
In irrigated areas this soil is suited to all crops corn- cause problems in dwelling and road construction. Capa-
monly grown in the area" including corn. sugar beets, bility subclass tie irrigated. IVe nonirrigated; Clayey
beans. alfalfa, and small grain. An example of a suitable Plains range site.
cropping system is 3 to 4 years of alfalfa followed by 67—Ulm clay loam, :3 to 5 percent slopes. This is a
corn, corn for silage, sugar beets, small grain, or beans. deep, well drained soil on plains at elevations of 5,075 to
Land leveling, ditch lining, and installing pipelines are 5,200 feet. It formed in alluvial and eolian sediments from
"needed for proper water applications. shale. Included in mapping are small areas of soils that
All methods of irrigation are suitable, but furrow ir- have shale between depths of 40 and 60 inches. Also in-
rigation is the most common. Barnyard manure and corn- eluded are small areas of soils where the surface layer
mercial fertilizer are needed for top yields. and subsoil have been recharged with lime from irriga-
In nonirrigated areas this soil is suited to winter wheat, tion.
barley, and sorghum. Most of the acreage is planted to Typically the surface of this Ulm soil is brown clay
winter wheat. The predicted average yield is 28 bushels loam about 5 inches thick. The subsoil is brown and pale
per acre. The soil is summer fallowed in alternate years brown clay about 12 inches thick. The substratum to a
to allow moisture accumulation. Generally precipitation is depth of 60 inches is clay and clay loam.
too low for beneficial use of fertilizer. Permeability is slow. A vailable water capacity is high.
Stubble mulch farming, striperopping, and minimum id- The effective rooting depth is 60 inches or more. Surface
lage are needed to control soil blowing and water erosion. runoff is medium, and the erosion hazard is moderate.
Terracing also may be needed to control water erosion. In irrigated areas this soil is suited to the crops corn-
The potential native vegetation is dominated by monly grown in the area. Perennial grasses and alfalfa or
western wheatgrass and blue grama. Buifalograss is also close grown crops should be grown at least 50 percent of
present. Potential production ranges from 1,000 pounds the time. Contour ditches and corrugations can be used in
per acre in favorable years to 600 pounds in unfavorable irrigating close grown crops and pasture. Furrows, con-
years. As range condition deteriorates, a blue grama-but- tour furrows, and cross slope fun-ows are suitable for row
falograss sod forms. Undesirable weeds and annuals in- crops. Sprinkler irrigation is also desirable. Keeping til-
vade the site as range condition becomes poorer. lage to a minimum and utilizing crop residue help to con-
Management of vegetation on this soil should be based trol erosion. Maintaining fertility is important. Crops
on taking half and leaving half of the total annual produc- respond to applications of phosphorus and nitrogen.
tion. Range pitting can reduce runoff. Seeding is desirable In nonirrigated areas this soil is suited to winter wheat,
if the range is in poor condition. Western wheatgrass, barley, and sorghum. Most of the acreage is planted to
blue grama, sideoats grama, buffalograss, pubescent winter wheat. The predicted average yield is 28 bushels
wheatgrass, and crested wheatgrass are suitable for seed- per acre. The soil is summer fallowed in alternate years
r..
44
SOIL SUR VEX
to allow moisture accumulation. Generally precipitation is Permeability is rapid. Available water capacity
too low to make beneficial use of fertilizer.
e
c
Stubble mulch farming, striperopping, and minimum til- ru off is effective
medium, and the erosion hazard is mode t
lage are needed to control soil blowing and water erosion.
Terracing also may be needed to control water erosion. e potential native vegetation is dominate b
^ The potential native vegetation is blue em, sideoats grama, sand reed
western eat n and blue gvegetation
Bis dominated by hairy ama, switch grass, b e
present. grass is also produ ion ranges from s700 pounds ne per acre p(
per acre Potential fe prode uction
ranges from 1,000gr per . A e n far
pounds years o t pounds thin unfavorable years. range
00 pounds in unfavorable graman det 'orates, the tall and mid dgrasses ecreac
years. As range condition deteriorates, a blue grama-buf- a
falograss sod forms. Undesirable weeds and annuals in- drops.
hairy grama increase, and for
vade the site as range condition becomes ge pros
Management of vegetation on this soil should be based half or less f the total annual producti . Deferred
Manage n[ of vegetation should be ased on
on taking half and leaving half of the total annual produc- ing is practi I in improving range con tion. Seedin
tion. Range pitting can reduce runoff. Seeding is desirable mechanical tr tment are impractical.
if the range is in poor condition. Western wheatgrass, Windbreaks nd environmental pi tings
blue grama, sideoats grama, buffalograss, pubescent not suited to th e soils. Onsite inve tigation is neec
whexcgrass, and crested wheat g general]
ing. The grass selected should meet are suitable for seed- determine if pla ings are feasible.
Wments of livestock. It can be seeded the
oaa cleannal ,require-
habitat e popula l are limited ecause t the nece
sorghum stubble, or it can be drilled into a firmprepared rangeland, only ngeland wil life, for example s
habitat elements a lacking. Bec se most of the act
seedbed. Seeding early in s is
ful. piing has proven most success- quail and antelope, a e typical. xtreme care is need,
Windbreaks and environmental managing livestock
shrubs plantings of trees and habitat on these soils. azing in rder to provide suit
commonly grown in the area are generally well Potential is poor fo urb
suited to this soil. Cultivation to control and recreational dew
vegetation should be competing ment. The chief limiting oil eatures are the loose, co
continued for as many years as textured soil, steep slope , nd rapid
possible following planting. Trees that are best suited and bility subclass VIIs irriggood survival P permeability.Cr:
are Rocky Mountain juniper, eastern Breaks range site- g ed, VIIs nonirrigated; r
redcedar, ponderosa pine, Siberian elm- Russian-olive, and
hackberr}'. The shrubs 69—Valent sand, 0 to
Lilac. Siberian peashrub, and America are excessively drained soil n p rcent slopes. This is a de
skunkbush sumac, ins at elevations of 4,65(
^ Wildlife is an important secondaryn plum. 5,100 feet. It formed in e 'an deposits. Included
cropland areas provide favorable ha use of this soil. The mapping are small ar s of sot s
habitat for ring-neckeddepth of 40 inches. that have lime wbout pheasant and mourning dove. can _
be attracted by Many nongame species can Typically the su ace layer brown sand about
establishing areas for nesting and escape
inches thick. The
cover. For pheasants, undisturbed nesting cover is pdenying ma rial to a depth of
tial should be included in plans for habitat inches is e brown sa
essen- permeabilit • i men t,and should in areas of ans a develop- erapid.rooting
bl water
land , especially
for example, the pronghorn culture. Range- moderate. The fective is l o , and capacityh ar
more. Surface g' de th is 60 inches
attracted by developing g rn antelope, can be low, Hoff is slow, th
P g livestock erosion hazard
managing livestock watering facilities,
grazing, and reseeding where needed. This soil t suited to se limited erosi
his soil poor potential for urban and recreationalcr ping. Intensi(
deThis soil
has Slow p cropping is bilious because such of erosi . The pro
permeability and high shrink swell system be d limited to closePPtn
cause in dwelling and road construction. Caps- falfa, gr w'n crops as a
catty problems ol In irrigated, IVs Heal wheapa and barley. e c soil goo i tt
Plains sun e site. rri aced; rigated pa are. A0 suitable 9 years cois
g Clayey 1 n an of alfa followed with 2 years of c 3 to
Usttc ornortnents mo era a rain alfalfa seeded a nurse crop. and sins;
deep, sstvely drained soils on terrace pbr use are Closel spaced contour ditches or sprinkers n be use(
deep,escarpments elevations of s,4on to 5, and in irri ing
formed in grave set. They gd close grown crops. Contour furrow or sprin-
i uvium and ha klers ould be used for new crops. Application bar-
percent. Included in ma opus of 9 to 25 nyar manure and commercial fertilizer help to ofaintain
have a all areas of soils that
pockets of sandy 1 oam in the underlying good reduction.
material. Y g T e potential vegetation is dominated by Typically t rface is bro bl stem, sand reed sand
en-
about ches thick. e layer a underlyingipaleavelly sand n dleandthread, little bluest mic and a blu sideoats
materialma,
inches is pale brown gravelly sand. epth t' I production ranges from 2,500grama. P vorable years to 1,800 pounds per acre r in
pounds in unfavorable years. s
50 SOIL SURVEY
sugar beets, small grain, or beans. Few conservation prac- The potential native vegetation is dominated by blue
ti are needed to maintain top yields. grama. Several mid grasses, such as western wheatgrass
A methods of irrigation are suitable, but furro ir- and needleandthread, are also present. Potential produc-
rigatio is the most common. Barnyard manure a com- tion ranges from 1,600 pounds per acre in favorable years
mercial tilizer are needed for top yields. to 1,000 pounds in unfavorable years. As range condition
Windbre s and environmental plantings g erally are deteriorates, the mid grasses decrease; blue grama, buf-
well suited this soil. Summer fallow ear before falograss, snakeweed, yucca, and fringed sage increase;
planting and c tinued cultivation for w d control are and forage production drops. Undesirable weeds and an-
needed to insure tablishment and sur val of plantings. nuals invade the site as range condition becomes poorer.
Trees that are bes suited and hay good survival are Management of vegetation on this soil should be based
Rocky Mountain jun er, easte redcedar, ponderosa on taking half and leaving half of the total annual produc-
pine, Siberian elm, Ru ian-oli and hackberry. The tion. Seeding is desirable if the range is in poor condition.
shrubs best suited are s k sh sumac, lilac, Siberian Sideoats grama, little bluestem, western wheatgrass, blue
peashrub, and American plu grama, pubescent wheatgrass, and crested wheatgrass are
Openland wildlife, suc s easant, mourning dove, suitable for seeding. The grass selected should meet the
and cottontail, are best ited to is soil. Wildlife habitat seasonal requirements of livestock. It can be seeded into
development, includi tree and rub plantings and a clean, firm sorghum stubble, or it can be drilled into a
grass plantings to ye as nesting a as, should be suc- firm prepared seedbed. Seeding early in spring has
cessful without i gation in most years. nder irrigation, proven most successful.
good wildlife h itat can be established, efiting many Windbreaks and environmental plantings are generally
kinds of ope nd wildlife. well suited to this soil. Summer fallow a year before
This soi as good potential for urban and reational planting and continued cultivation for weed control are
develop nt. The chief limiting soil features urban needed to insure establishment and survival of plantings.
devel ent are the shrink-swell potential of the bsoil Trees that are best suited and have good survival are
as i ets and dries and the limited capacity of the so to Rocky Mountain juniper, eastern redcedar, ponderosa
s port a load. Lawns, shrubs, and trees grow well. Cap pine, Siberian elm, Russian-olive, and hackberry. The
shrubs best suited are skunkbush sumac, lilac, Siberian
79—Weld loam, 1 to 3 percent slopes. This is a deep, peashrub, and American plum.
well drained soil on smooth plains at elevations of 4,850 to Openland wildlife, such as pheasant, mourning dove,
5,000 feet. It formed in eolian deposits. Included in and cottontail, are best suited to this soil. Wildlife habitat
mapping are small areas of soils that have a subsoil of development, including tree and shrub plantings and
loam and light clay loam. Also included are some leveled grass plantings to serve as nesting areas, should be suc-
areas. cessful without irrigation during most years. Under ir-
Typically the surface layer of this Weld soil is brown rigation, good wildlife habitat can be established, benefit-
loam about 8 inches thick. The subsoil is brown and pale ing many kinds of openland wildlife.
brown heavy clay loam and light clay about 20 inches This soil has good potential for urban and recreational
thick. The substratum to a depth of 60 inches is silt loam. development. The chief limiting soil features for urban
Permeability is slow. Available water capacity is high. development are the shrink-swell potential of the subsoil
The effective rooting depth is 60 inches or more. Surface as it wets and dries and the limited capacity of the soil to
runoff is slow, and the erosion hazard is low. support a load. Lawns, shrubs, and trees grow well. Capa-
In irrigated areas this soil is suited to all crops com- bility subclass IIe irrigated, IIIc nonirrigated; Loamy
monly grown in the area, including corn, sugar beets (fig. Plains range site.
8), beans, alfalfa, small grain, and onions. An example of a 8U—weed loam, 3 to 5 percent slopes. This is a deep
suitable cropping system is 3 to 4 years of alfalfa fol- w drained soil on plains at elevations of 4,850 to 5
lowed by corn, corn for silage, sugar beets, small grain, or feet. armed in eolian deposits. Included in map ' are
beans. Land leveling, ditch lining, and installing pipelines small are of soils that have a subsoil of loa nd light
are needed for proper water applications. clay loam.
All methods of irrigation are suitable, but furrow ir- Typically the urface layer is bro loam about S
rigation is the most common. Barnyard manure and com- inches thick. The s oil is brown pale brown heavy
mercial fertilizer are needed for top yields. clay loam and light c about inches thick. The sub-
This soil is well suited to winter wheat, barley, and stratum to a depth of 60 I is silt loam.
sorghum if it is summer fallowed in alternate years. Permeability is slow. I le water capacity is high.
Winter wheat is the principal crop. The predicted average The effective rootin pth is 6 ' ches or more. Surface
yield is 33 bushels per acre. If the crop is winterkilled, runoff is medium d the erosion h rd is moderate.
spring wheat can be seeded. Generally precipitation is too In irrigated eas this soil is suited t ost of the crops
low for beneficial use of fertilizer. commonly own in the area, such as corn, alfa, wheat,
Stubble mulch farming, striperopping, and minimum til- and b y. Sugar beets are often grown. e soil is
lage are needed to control soil blowing and water erosion. sui to irrigated pasture. Ditch lining and i ailing
Terracing also may be needed to control water erosion. elines are needed for proper water application.
52 SOIL SURVEY
b1.t, 1' 't..d ...i.....1, ,.f Al.:., ....1 t., __„....I. .. 1__]. (Lee- Management of vegetation on this soil should be bases
U on taking half and leaving half of the total annual produc
I 82—Wiley-Colby complex, 1 to 3 percent slopes. This 1 tion. Seeding is desirable if the range is in poor condition
, nearly level map unit is on smooth plains in the western Sideoats grama, little bluestem, western wheatgrass, blue
part of the survey area at elevations of 4,850 to 5,000 grama, pubescent wheatgrass, and crested wheatgrass are
feet. The Wiley soil makes up about 60 percent of the suitable for seeding. The grass selected should meet the
unit, and the Colby soil about 30 percent. About 10 per- seasonal requirements of livestock. It can be seeded into
cent is Heldt silty clay and Weld loam. a clean, firm sorghum stubble or it can be drilled into a
The Wiley soil is deep and well drained. It formed in firm prepared seedbed. Seeding early in spring has
calcareous eolian deposits. Typically the surface layer is proven most successful.
pale brown silt loam about 11 inches thick. The subsoil is Windbreaks and environmental plantings are generally
pale brown silty clay loam about 23 inches thick. The sub- well suited to these soils. Cultivation to control competing
stratum to a depth of 60 inches is very pale brown silty vegetation should be continued for as many years as
clay loam.
possible following planting. Trees that are best suited and
Permeability is moderately slow. Available water have
capacity is high. The effective rooting depth is 60 inches redcedar, ponderosa pine, Siberiaal are Rocky Mountain
elm, Russ aneolive, and
or more. Surface runoff is medium, and the erosion hackberry. The shrubs best suited are skunkbush sumac,
hazard is moderate. lilac, Siberian peashrub, and American plum.
The Colby soil also is deep and well drained and formed Openland wildlife, such as pheasant, mourning dove,
in calcareous eolian deposits. Typically the surface layer and cottontail are best suited to these soils. Wildlife
is pale brown loam about 7 inches thick. The underlying habitat development, including tree and shrub plantings
material is very pale brown silt loam to a depth of 60 and grass plantings to serve as nesting areas, should be
inches. successful without irrigation during most Permeability is moderate. Available water capacity is rigation, good wildlife blishe ,Under it-
high. The effective rooting depth is 60 inches or more. ing many kinds of openland wildlife.
Surface established, benefit-
Surface runoff is medium, and the erosion hazard is The Wiley soil has only fair potential for urban and
moderate. recreational development. Slow
permeability,
This map unit is used for irrigated and nonirrigated shrink-swell potential, and limited bearngcapacit d
y cause
cropland and for rangeland, wildlife habitat, and urban problems in dwelling and road construction. The Colby
development.
soil In irrigated areas these soils are suited to all crops ment.aRoad design s good potential beor urban and recreational for commonlygn can be modified to compensate the
grown in the area, including corn, sugar beets, limited capacity of this soil to support a load. Capability
beans, alfalfa, small grain, and onions. An example of a subclass Ile irrigated, IVe nonirrigated; Loamy Plains'
suitable cropping system is 3 to 4 years of alfalfa fol- (range site.
lowed by corn, corn for silage, sugar beets, small grain, or iis—.Wuey_tolby complex, .1 to 5
beans. Land leveling, ditch lining, and installing pipelinesy percent slopes. this
may be needed for proper water applications. to , 00 sloping map unit is soilo ke up t about 60 ons c 4
feet. The Wey si makes perc t 1of
0
All methods of irrigation are suitable, but furrow ir- the u ' , and the Colby soil about 30
ligation is the most common. Barnyard manure and com- percent Heldt silty clay and Weld loam.
out 10
mercial fertilizer are needed for top yields. The Wi soil is deep and well drained. formed in
In nonirrigated areas these soils are suited to winter calcareous e ' n deposits. Typically the ace layer is
wheat, barley, and sorghum. Most of the acreage is pale brown silt am about 11 inches t planted to winter wheat. The predicted average yield is . The subsoil is
pale brown
28 bushels per acre. The soil is summer fallowed in al- stratum
to a d silty loam about i2 i es thick. The sub-
ternate years to allow moisture accumulation. Generally clay loam depth 60 inches ery pale brown silty
precipitation is too low for beneficial use of fertilizer. Permeability is mo at slow. Available water
Stubble mulch farming, striperopping, and minimum til- capacity is high. The effe e rooting depth is 60 inches
lage are needed to control soil blowing and water erosion. or more. Surface runoff
Terracing also may be needed to control water erosion. ium to rapid, and the ero-
sion hazard is modera The potential native vegetation is dominated by blue The Colby soil al is deep and ell drained and formed
grama. Several mid grasses such as western wheatgrass in calcareous eo ' deposits. Typic ce layer
and needleandthread are also present. Potential produc- is pale brown am about 7 inches thy . The the s underlying
tion ranges from 1,600 pounds per acre in favorable years material is
ry pale brown silt loam a depth of 60
to 1,000 pounds in unfavorable
years. As range condition inches.
deteriorates, the mid grasses decrease; blue grama, buf- Pe bility is moderate. Available wate capacity is
falograss, snakeweed, yucca and fringed sage increase; high he effective rooting depth is 60 inche r more.
and forage production drops. Undesirable weeds and an- S ace runoff is medium to rapid, and the erosio azard
nuals invade the site as range condition becomes poorer. ' moderate.
..--
102 SOIL SURVEY
TABLE 6.--BUILDING SITE DEVELOPMENT--Continued
•
Soil name and , Shallow Dwellings
map symbol excavations withouDwellings Small Local roads
t with commercial and streets
—r_ basements basements buildings
44 :Slight
Olney Slight Slight Slight Moderate:
low strength.
45 ;Slight Slight
Olney Slight Moderate: Moderate:
slope. low strength,
4 Olney Slight Slight Slight Slight Moderate:
low strength.
48 Slight
Olney Slight Slight Moderate: Moderate:
slope. low strength.
49 Severe: Slight
Osgood cutbanks cave. Slight Slight Slight.
50, 51 Slight
Otero Slight Slight Slight Slight.
52, 53 Slight
Otero Slight Slight Moderate: Slight.
slope.
54 Slight
Severe: Severe:; Moderate:
Paoli g Severe:
floods. floods. floods. low strength,
frost action.
55 Slight
Paoli Slight Slight Slight Moderate:
low strength,
frost action.
56 Moderate: Moderate: Moderate:Renohill depth to rock, low strength, low strength, Moderate: Severe:
rlow st
too clayey. shrink-swell, depth to rock, shrink-swell, low nk-swell,
swell. shrink-swell.
shrink-swell.
57 Moderate: Moderate:; Moderate:Renohill depth to rock, low strength, Moderate: Severe:
too clayey. g low strength, slope, low strength,
Y Y� ; shrink-swell, depth to rock, low strength,
shrink-swell. shrink-swell, shrink-swell.
58, 59 Severe: Severe: Severe:
Severe: Severe
Shingle depth to rock, depth to rock. depth to rock, depth to rock. depth.to rock.
60':
Shingle Severe: Severe: Severe:
Severe: Severe:depth to rock. depth to rock. depth to rock. depth to rock. depth to rock.
Renohill Moderate: Moderate: Moderate:
depth to rock, low strength,
, Severe:
too clayey. e low ht ton rock slope, low nk-sw$11.Y Y• ; shrink-swell. ; depth to rock, low strength, shrink-
; shrink-swell. shrink-swell, sw�p'l1.
61 Moderate: Moderate: ;Moderate: Severe:
Tassel depth to rock. depth to rock. ; depth to rock, slope. Moderate:
p depth to rock.
62 Severe: Moderate: ;Severe:
Moderate:
Terry depth to rock. depth to rock. ; depth to rock. ;� depth Moderate:
to rock. depth torock.
63 Severe: 'Moderate: S . Moderate:
Terry depth to rock. depth to rock. depth to rock. depth; to rock, Mdepthtto rock.
slope.
64 Moderate: Moderate: ;Moderate: Moderate:Thedalund depth to rock. low strength. ; depth to rock. low strength. Moderate:
low strength.
65 Moderate: Moderate: ;Moderate: Moderate:Thedalund depth to rock. low strength. depth to rock. low strength, Moderate:
low strength.
slope.
See footnote at end of table.
WELD COUNTY, COLORADO, SOUTHERN PART 103
TABLE 6.--BUILDING SITE DEVELOPMENT--Continued
-"" Soil name and Shallow Dwellings Dwellings Small
map symbol excavations without andal roads
with commercial and streets
basements basements buildings
66, 67- Moderate: Severe: Severe: Severe:
Ulm too cla a Slowrs:
Y Y� shrink-swell. shrink-swell, shrink-swell. low strength,
shrink-swell.
_ 68* Severe: Moderate: Moderate: Moderate: Moderate:
Ustic small stones, slope. slope. slope.
Torriorthents cutbanks cave. slope.
69 Severe: Slight Slight
Valent cutbanks cave. g Slight Slight.
70 Severe: Slight Slight Moderate: ;Slight.
Valent cutbanks cave. slope.
71*:
Valent Severe: Slight Slight Moderate: ',Slight.
cutbanks cave. slope.
Loup Severe: Severe: Severe: Severe: Severe:
wetness, wetness, wetness, wetness, wetness.
cutbanks cave, floods. floods. floods.
72 LSlight Slight
Vona Slight Slight Moderate:
low strength.
73, 74 Slight Slight Slight Moderate: Moderate:
Vona
slope. low strength.
75, 76 Slight
Vona ;Slight Slight Slight Moderate:
low strength.
77 Slight Slight Slight ;Moderate: Moderate:
,.0-5 Vona slope. low strength.
(8, 79- Slight Moderate: Moderate: ',Moderate: Moderate:
Weld low strength, low strength, low strength,g low strength,
shrink-swell. ; shrink-swell. I shrink-swell. shrink-swell,
frost action.
80 Slight Moderate: ;Moderate: Moderate: Moderate:Weld low strength, low strength, low strength, low strength,
shrink-swell. shrink-swell. slope, shrink-swell ,
shrink-swell. frost action.
81* 82*:
Wiley Slight Moderate: Moderate: ;Moderate: Moderate:
low strength, low strength, ; low strength, low strength,
shrink-swell. shrink-swell. ; shrink-swell. shrink-swell .
Colby Slight Slight g Slight ;Slight Moderate:
low strength.
83*:
Wiley Slight Moderate: Moderate: ',Moderate: ',Moderate:
low strength, I low strength, low strength, low strength,
shrink-swell. ; shrink-swell. slope, shrink-swell.
shrink-swell . ,
Colby Slight Slight ;Slight Moderate: ',Moderate:
slope. ' low strength.
* See map unit description for the composition and behavior of the map unit.
/^
106 SOIL SURVEY
TABLE 7.--SANITARY FACILITIES--Continued
— —_— —_ r_
Soil name and Septic tank Sewage lagoon Trench Area Daily cover
map symbol absorption areas sanitary sanitary for landfill
fields landfill landfill
43 Severe: Moderate: Slight Slight Fair:
Nunn percs slowly. excess humus. too clayey.
44, 45, 46, 47, 48-- Slight Severe: Slight Slight Good.
Olney seepage.
49 Slight Severe: Severe: Severe: Fair:
Osgood seepage. seepage. seepage. too sandy.
50, 51 , 52 Slight Severe: Slight Slight Good.
Otero seepage.
53 Slight Severe: Slight Slight Good.
Otero slope,
seepage.
54 Slight Severe: Severe: Severe: Good.
Paoli seepage. seepage. seepage.
55 Slight Severe: Severe: Severe: Good.
P oli seepage. seepage. seepage.
56, 57--- Severe: Severe: Severe: Slight Fair:
Renohill percs slowly, depth to rock. depth to rock, too clayey,
depth to rock, thin layer.
58, 59 Severe: Severe: Severe: Slight Poor:
Shingle depth to rock. depth to rock. depth to rock. thin layer.
60*:
Shingle Severe: Severe: 'Severe: Slight Poor:
depth to rock. depth to rock. depth to rock. thin layer.
enohill Severe: Severe: Severe: Slight Fair:
percs slowly, depth to rock. depth to rock. too clayey,
depth to rock. thin layer.
61 Severe: ;Severe: Severe: Severe: Poor:
Tassel depth to rock. ; depth to rock, depth to rock, seepage. thin layer,
I ; seepage, seepage. area reclaim.
slope.
62, 63 Severe: ''Severe: Severe: Slight Fair:
Terry depth to rock. ; depth to rock, depth to rock. thin layer,
; seepage. area reclaim.
64, 65 Severe: ;Severe: Severe: Slight Fair:
Thedalund depth to rock. 1 depth to rock. depth to rock. thin layer.
10 Severe: ;Slight Moderate: Slight Poor:
percs slowly. too clayey. too clayey.
® Severe: ;Moderate: Moderate: Slight Poor:
percs slowly. slope. too clayey. too clayey.
Moderate: :Severe: Severe: Severe: Poor:
Ustic Torriorthents slope. 1 seepage, seepage, ' seepage. too sandy,
I small stones. too sandy. small stones.
69, 70 Slight ;Severe: Severe: Severe: Poor:
Valent seepage. too sandy, seepage. too sandy.
seepage.
71*:
Valent Slight ;Severe: Severe: Severe: Poor:
seepage. too sandy, seepage. too sandy.
seepage.
/—" See footnote at end of table.
WELD COUNTY, COLORADO, SOUTHERN PART 107
/'- TABLE 7.--SANITARY FACILITIES--Contir^
Soil name and Septic tank Sewage lagoon Trench Area Daily cover
map symbol absorption areas sanitary sanitary for landfill
fields landfill landfill
i0"-... 71*:
Loup Severe: Severe: Severe: ;Severe: Poor:
wetness, wetness, wetness, wetness, wetness.
floods. seepage, seepage, seepage,
floods. floods. floods.
72, 73 Slight Severe: Slight Slight Good.
Vona seepage.
74 Slight Severe: Slight Slight Good.
Vona seepage,
slope.
75, 76, 77 Slight Severe: Slight Slight Good.
Vona seepage.
78 Moderate: Moderate: Slight Slight Good.
Weld percs slowly. seepage.
79, 80- Moderate: Moderate: Slight Slight Good.
Weld percs slowly. slope,
seepage.
81*:
Wiley Moderate: Moderate: Slight Slight Fair:
percs slowly. seepage. too clayey.
Colby Slight Moderate: Slight Slight Good.
seepage.
82*, 83*:
Wiley--- Moderate: Moderate: Slight Slight Fair:
percs slowly. seepage,
too clayey.
slope.
Colby Slight Moderate: Slight Slight Good.
seepage.
n
* See map unit description for the composition and behavior of the map unit.
r—
WELD COUNTY, COLORADO, SOUTHERN PART 113
TABLE 9.--WATER MANAGEMENT--Continued
T
Soil name and Pond Embankments, Drainage Irrigation Terraces Grassed
map symbol reservoir dikes, and and waterways
areas levees diversions
40 Favorable ',Compressible, Peres slowly, Peres slowly, Peres slowly--- Favorable.
Nunn shrink-swell, slope. slope.
; hard to pack.
41 Favorable ;Compressible, Percs slowly--- Peres slowly--- Percs slowly--- Favorable.
Nunn ; shrink-swell ,
I hard to pack.
42 Favorable ;Compressible, Peres slowly, Percs slowly, Peres slowly--- Favorable.
Nunn ; shrink-swell, slope. slope.
I hard to pack.
43 Favorable ',Compressible, Peres slowly--- Peres slowly--- Peres slowly--- Favorable.
Nunn shrink-swell ,
hard to pack.
44 Seepage, Piping, Slope Soil blowing, Erodes easily, Erodes easily.
Olney slope. low strength. droughty. piping.
45 Seepage, Piping, Slope Soil blowing, Erodes easily, Erodes easily.
Olney slope. low strength. droughty, piping.
slope.
46 Seepage, ;Piping, Favorable Favorable Erodes easily, Erodes easily.
Olney slope. ; low strength. piping.
47, 48 Seepage, Piping, Slope Slope, Erodes easily, Erodes easily.
Olney slope. low strength. erodes easily. ; piping.
49 Seepage Piping Favorable Soil blowing---'Too sandy, Erodes easily.
Osgood piping.
y"Z Seepage Piping, Favorable Droughty Erodes easily, Erodes easily.
ero seepage. piping.
51 , 52, 53 Seepage, ,Piping, Slope Slope, Erodes easily, Erodes easily.
Otero slope. ; seepage. erodes easily, piping.
droughty.
54 ',Seepage Piping, Favorable Favorable Piping Favorable.
Paoli low strength.
55 ;Seepage Piping, Slope Slope Piping Favorable.
Paoli low strength.
56 • ;Depth to rock Low strength, Depth to rock, Rooting depth, Depth to rock, Rooting depth,
Renohill thin layer, percs slowl slow intake.y• percs slowly. percs slowly.
compressible.
57 ;Slope, ;Low strength, Slope, Slope, Depth to rock, Rooting depth,
Renohill ; depth to rock. : thin layer, depth to rock, rooting depth, peres slowly. percs slowly.
; compressible. percs slowly. slow intake.
58, 59 ;Slope, :Low strength, Depth to rock, Slope, Depth to rock Rooting depth.
Shingle depth to rock. ; thin layer. slope. rooting depth.
60*:
Shingle :Slope, Low strength, Depth to rock, Slope, Depth to rock Rooting depth.
depth to rock. thin layer. slope. rooting depth.
Renohill Slope, Low strength, Slope, Slope, Depth to rock, Rooting depth,
: depth to rock. thin layer, depth to rock, rooting depth, percs slowly. percs slowly.
compressible. percs slowly. slow intake.
61 Depth to rock, Erodes easily, Not needed Droughty, Depth to rock, Rooting depth,
Tassel slope. thin layer. rooting depth. erodes easily. erodes easily.
62 ,Depth to rock, Piping, Slope, Slope, Depth to rock, Rooting depth,
Terry seepage. thin layer. rooting depth. rooting depth, • piping, soil blowing.
soil blowing. soil blowing.
See footnote at end of table.
114 SOIL SURVEY
TABLE 9.--WATER MANAGEMENT--Continued
Soil name and Pond Embankments, 1 Drainage Irrigation Terraces Grassed
", map symbol reservoir dikes, and and waterways
areas levees
r-- , diversions
63 Slope, Piping, Slope, Slope, Slope, Slope,
Terry depth to rock, thin layer. rooting depth. rooting depth, depth to rock, rooting depth,
_ seepage. soil blowing
. soil blowing. soil blowing.
64 Depth to rock, Low strength, Slope, Slope, Depth to rock Rooting depth.
Thedalund slope. piping, depth to rock. rooting depth.
thin layer.
65 Depth to rock, Low strength, Slope, Slope, Depth to rock Slope,
Thedalund slope. piping, depth to rock. rooting depth. rooting depth.
thin layer.
66 Favorable Low strength, Favorable Peres slowly, Peres slowly--- Erodes easily,
Ulm shrink-swell, erodes easily.
compressible.
67---- Slope Low strength, Slope Slope, Peres slowly--- Erodes easily,
Ulm shrink-swell , peres slowly,
compressible. erodes easily.
68* Seepage, Seepage', Slope Slope, Too sandy, Droughty,
Ustic slope. droughty, slope. slope.Torriorthents P pe.
59 Seepage, Piping, Slope Slope, Erodes easily, Erodes easily.
Valent slope. ; seepage, erodes easily, piping.
droughty.
70 Seepage, Piping, Slope Slope, Erodes easily, Slope,
Valent slope. seepage, erodes easily, piping. erodes easily.
droughty,
71*:
yglent Seepage, Piping, Slope Slope, Erodes easily, Slope,
slope. seepage. erodes easily, piping. erodes easily.
droughty.
Loup Seepage Seepage, Poor outlets, Wetness, Not needed Not needed.
piping. cutbanks cave. seepage.
72, 73 Seepage, Piping, Slope Slope, Piping, Erodes easily.
Vona slope. erodes easily, fast intake, erodes easily.
seepage. seepage.
74 Seepage, Piping, Slope Slope, Piping, Slope,
Vona slope. erodes easily, fast intake, erodes easily
. erodes easily.
seepage. seepage.
75 Seepage, Piping, Favorable Fast intake, Piping, Erodes easily.
Vona slope. erodes easily, seepage. erodes easily.
seepage.
76, 77 Seepage, Piping, Slope Slope, Piping, Erodes easily.
Vona slope. erodes easily, fast intake, erodes easily.
seepage. seepage.
78 Seepage Low strength--- Peres slowly--- Peres slowly, Piping, Peres slowly.
Weld slow intake.
peres slowly.
79, 80 Seepage Low --stren th-
Weld g Slope, Slope, Piping, Peres slowly.
Peres slowly. Peres slowly, Peres slowly.
slow intake.
81*:
Wiley Slope, Piping, Peres slowly--- Favorable Piping
seepage. low strength. Erodes easily.
Colby Seepage ;Low strength, Favorable Favorable Favorable Favorable,
piping.
wee footnote at end of table.
WELD COUNTY, COLORADO, SOUTHERN PART 115
TABLE 9.--WATER MANAGEMENT--Continued
Soil name and Pond Embankments, Drainage Irrigation Terraces Grassed
,.11 map symbol reservoir dikes, and and waterways
areas levees diversions
82•:
Wiley- Slope, Piping, Slope, Slope, Piping Erodes easily.
seepage. low strength. peres slowly. erodes easily.
Colby- Seepage Low strength, Favorable Favorable Favorable Slope,
piping. erodes easily.
83*:
Wiley Slope, Piping, Slope, Slope, Piping ;Slope,
seepage. low strength. peres slowly. erodes easily. ; erodes easily.
Colby Seepage Low strength, Slope Slope, Favorable ;Slope,
piping. erodes easily. erodes easily .
* See map unit description for the composition and behavior of the map unit.
•
WELD COUNTY, COLORADO, SOUTHERN PART 127
TABLE 12.--ENGINEERING PROPERTIES AND CLASSIFICATIONS--Continued
Classification Frag- Percentage passing
,.....,Soil name and ;Depth USDA texture mints sieve number-- Liquid Plas-
map symbol Unified AASHTO > 3 limit ticity
inches 4 10 40 200 index
In ...- Pct Pct
56, 57 0-9 Clay loam CL A-6 0 85-100 80-100 80-95 70-80 25-40 10-20
Renohill 9-32 Clay, clay loam CL, CH A-7, A-6 0 95-100 90-100 90-100 75-95 35-65 20-35
32 Weathered --- --- --- --- ___ ___ ___ ___ ---
bedrock.
58, 59 0-6 Loam CL-ML A-4 0-5 75-100 75-100 70-95 55-75 25-35 5-10
Shingle 6-18 Clay loam, loam CL A-6 0 75-100 75-100 65-100 50-80 30-40 10-20
18 Unweathered --- --- --- --- ___ ___ ___ ___ ---
bedrock.
60*:
Shingle 0-6 Loam CL-ML A-4 0-5 75-100 75-100 70-95 55-75 25-35 5-10
6-18 Clay loam, loam CL A-6 0 75-100 75-100 65-100 50-80 30-40 10-20
18 Unweathered --- --- --- --- ___ ___ ___ --- ---
bedrock.
Renohill 0-9 Clay loam CL A-6 0 85-100 80-100 80-95 70-80 25-40 10-20
9-32 Clay, clay loam CL, CH A-7, A-6 0 95-100 90-100 90-100 75-95 35-65 20-35
32 Weathered -__ __- ___ ___ ___ ___ ___ ___ ---
bedrock.
61 ', 0-11 Fine sandy loam ML, SM A-4 0 95-100 90-100 70-95 40-65 20-35 NP-5
Tassel 11 Unweathered --- -__ --- --- ___ ___ ___ _-- ---
bedrock.
62, 63 0-6 Fine sandy loam ;SM, ML A-2, A-4 0-5 75-100 75-100 70-90 30-60 --- NP
Terry 6-18 Fine sandy loam, ;SM, ML A-4 0 75-100 75-100 70-85 40-60 --- NP
sandy loam.
18-37 Fine sandy loam, ;SM A-2, A-4 0-5 75-100 75-100 70-85 25-50 --- NP
sandy loam,
loamy fine ,
sand.
"e ., 37 Weathered --- --- --- --- ___ ___ ___ ___ ___
bedrock.
64, 65 0-8 ;Loam ;CL-ML A-4 0-5 80-100 75-100 70-95 50-75 20-30 5-10
Thedalund
8-251Clay loam, loam, CL-ML, A-6, A-4 0-5 80-100 75-100 70-95 40-80 1 25-35 5-15
; very fine sandy CL,
loam. SM-SC,
SC
25 (Weathered --- --- ___ __ ___ ---
1 bedrock.
66, 67 0-5 ;Clay loam CL A-6 0-5 95-100 95-100 80-100 70-80 30-40 10-15
Ulm 5-19;Clay loam, clay CL A-6, A-7 0-5 75-100 75-100 75-100 60-80 35-45 20-30
19-60;Clay loam CL A-6 0-5 75-100 75-100 75-100 60-80 30-40 15-20
68* ;Variable ___
U stic
Torriorthents
69, 70 0-8 Fine sand SM A-2 0 100 100 80-95 10-30 --- NP
Valent 8-60 Fine sand, sand SP-SM, SM A-2, A-3 0 100 95-100 75-90 5-20 --- NP
71*:
Valent 0-8 Fine sand SM, A-2 0 100 100 80-95 10-30 i --- NP
8-60 Fine sand , sand SP-SM, SM A-2, A-3 0 100 95-100 75-90 5-20 --- NP
Loup I 0-16 Loamy sand SM A-2 0 100 100 ,50-100 15-30 ; --- NP
116-60 Fine sand , loamy SP-SM, SM A-2, A-3 0 100 100 :65-100 5-20 --- NP
sand, sand.
See footnote at end of table.
128 SOIL SURVEY
TABLE 12.--ENGINEERING PROPERTIES AND CLASSIFICATIONS--Continued
— Classification Frag- Percentage passing
Soil name and Depth USDA texture I -
men3s sieve number--
� map symbol Unified AASHTO > 3 _ Liquid ; Pies-
. -- limit ticity
inches 4 10 40 200 index
In Pet -- _
Pet
72, 73, 74 0-6 Loamy sand SM A-2 0 100 90-100 60-90 15-30 --- NP
Vona 6-28 Fine sandy loam, SM A-2, A-4 0 100 90-100 60-90 30-45 --- NP
sandy loam.
28-60 Sandy loam, SM A-2 0 100 90-100 50-85 15-30 NP
loamy sand. ---
75, 76, 77 0-6 Sandy loam SM A-2, A-4 0 100 90-100 60-90 30-45 --- NP
Vona 6-28 Fine sandy loam, SM A-2, A-4 0 100 90-100 60-90 30-45 NP
sandy loam. ---
28-60 Sandy loam, SM A-2 0 100 90-100 50-85 15-30 --- NP
loamy sand.
78, 79, 80- 0-8 Loam
Weld ;ML,
CL-ML A-4 0 100 95-100 85-100 60-85 20-3D NP-10
8-15 Silty clay loam, 1CL A-6, A-7 0 100 100 95-100 85-95 ; 35-50 15-30
silty clay.
15-60 Silt loam, loam ;CL-ML, CL A-4, A-6 0 100 95-100 85-100 60-85 20-35 5-15
81*, 82*, 83*:
Wiley -- 0-11 Silt loam ;CL-ML, CL A-4, A-6 0 100 100 90-100 70-90 25-35 5-15
11-60 Silty clay loam, :CL A-6 0 100 100 90-100 70-95 25-35 10-20
silt loam.
Colby---- 0-7 Loam ;CL-ML A-4 0 100 100 90-100 85-100; 25-30 5-10
7-60 Silt loam, loam ;CL-ML A-4 0 100 100 90-100 85-100; 25-30 5-10
* See map unit description for the composition and behavior of the map unit.
,.0"
Hello