PERMFILE48585

• Permit No: M1998091
• IBM Index Class Name: Permit File
• Doc Date: 12/15/1998
• Doc Name: FACILITY LOCATION SKETCH
• Media Type: D
• Archive: No

u:S. utrAaxetxt ur nuatcutruxt nvc a yr ,
NATURAL RESOURCES CONSERVATION SERVICE • ~ 11/11198
INTER FEATURES
Endaate -- LATER FEATURES
This report gi-ea eatieatea of nriora soil rater features. The eatiutea are used in land use planning that ino hen
engineering conaideratioma.
Hydrologic soil groapa are used to estivate rmaof[ froe precipitation. Soils not protected by -egetation are
assigned to one of Poor grmepa. They are grouped according to the infiltration of rater Theo the voila are thoroughly
net and recei-e precipitation froe long-drratiom etona. the four 6ydrolagic soil groapa are:
Group ' A'. Soils haying thigh infiltration rate (tor
runoff potential( Theo thoroughly yet. These comsiat vainly
of deep, melt drained tm erceaai-ely drained aaada or
gravelly aaada. Theae eoile ha-e a high rate of rater
tnnaeiaaion.
Groop 'B'. Soils having a eoderate imfiltratioa rate rhea
thoroughly met. Theae coasiat chiefly of eoderately deep or
deep, eoderately cell drained or tell draiued aoila that
here eoderately floe tenure to eoderately coarse tertare.
Theae aoila hne a eoderate me of rater tnnaeiasiom.
Group 'C'. Soils ha-iag a elor infiltration rate rhea
thoroughly yet. Theae coasiat chiefly of soils having a
layer that iepedea the dormrard eo-eeent of rater or soils
of eoderately tine tertmre or fine tertare. these voila
hne a atom rate of refer tranaeiaeiom.
Groop 'D'. Soils having a -ery alai infiltration rate (high
runoff potential) rhea thoroughly met. Theae comsiat
chiefly of clays that have a high ahrimk-arell potential,
soils that hne a pereaaeat high rater hble, aaila that
have a cleypan or clay layer tt or near the amrfnce, nod
soils that are ahallom o-er nearly iepenious raterial.
Theae soils here a very slor rate of rater tranaeiasion.
if a soil is essigsed to fro hydrologic groups im thin report, the first letter is for drained areas and the second
is for uadrained areas. Flavding, the teeporary inundation of an area, is caused by overfloring atreama, by roooff froe
adjacent slopes, or by tides. later standing for short periods after rainfall or anoreelt is not considered
looding, nor is rater in amampa and marshes. Thin report given the frequency and doration of floodimg and
the time of year ^hes flooding is eoet likely. Frequency, duration, and probable dates of mccurreace are eetieated.
Frequency is expressed as 'None', 'Rare', 'Occasional', end 'Frequent'. 'None' Beans that flooding is not probable;
'Rare' that it is unlikely but poasi6le under unusual reacher conditions; 'Occasional' that it occurs, on the
overage, once or less in 1 years; and 'Frequent' that it occurs, on the average, Bare than once in 1 years.
Luration is expressed as 'Very brief' if less than 1 days, 'Brief' if 1 to 1 days, 'Long' if 1 to )0 days, end 'Very
long' i( core than )0 days. The intonation is based on evidence in the soil profile, naeely thin strata of grass),
sand, silt, or clay deposited by floodreter; irregular decrease in organic matter content rich increasing depth:
end absence of distinctive horizons that (ore in soils that are not subject to flooding. hlso considered are local
inforeatioa abou[ the extent and levels of flooding and the relation of each sail on the landscape to historic floods.