WSP04023

• File Number: 8272.600.60
• Description: Colorado River Basin Salinity Control Program - Basin Member State Info - Utah
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 7/1/1990
• Title: Upper Colorado River Basin Rangeland Salinity Control Project
• Water Supply Pro - Doc Type: Report/Study

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t1A 7) l./t/uT) SEDIMENT YIELD FACTOR RATING
SURFACE GEOLOGY SOILS CLIMATE RUNOFF TOPOGRAPHY
(.j (b) (c) (d) (e\
(10) (10) (10) (10) (20)
.. Marine ahales and re. ~ Fine textured; easi. .. Storma of several a. HiCh peak Rows per .. Steep upland slopes
lated mudstone. and ly d.1.peraecl~ .aUae- day.' dwaUon with ~ unit vea (in excess of 300J.)
.Utatonee alkalln.; hith .brink- sllort period. of in- )t.!. Larae volume of flow b. Hich rellef; tittle or
.wall cnaractertaucs tenee rainfall per unit area no floodplain devel.
b. SlIlil. lI"ain slits and b. Freq\Mnt intenae con ~ct.L-.~$~ opment ..FQ~ Ib~_
fine saDds b ~ectl..,e atonns ~
A LK'A).lJJf . Free:ee-thaw occur-
/110& ....e.
(5) (5) (5) (S) (10)
.. Rocks of medium So Medium textured soU .0 StollQa of moderate '. Moderate pe.k nnws .. Moderate upland.
hardnese b. Occa.ional rbck fr8C'"' duration and intensity per unit area slopes (less than 20~G)
b. Moderatel'l weathered ment, ~ Infrequent convective b. Moderate volume of b. Moderate fan or flood-
e. Moderately fractured e. Caliche layers stol'llla now per unit area plain develop~t
.fi:Jj,'~
(0) (0) (0) (0) (0)
a. Maasive, hard forma. .. Hlah percentage of a. Humid cUmate with a. Low peak flows per a. Gentle upland slopes
tiona rock fragments rainfaU of low inten. unit area (less than SGJ'G)
b. Aggregated clays sity b. Low volume of runoff b. Extensive aUuvial
e. Highin oreanic matter b. PreCipitation in form pet unit area plains .
; 1/1/./C (J5 of Sl\ow e. Rare runotf events
c. Arid cUmate, low in.
/' tensity storms
( I Y ItM/" ,,1<< 'I",,~ I d. Arid climate; r..e
convective storms
Factor T S , !() 7 :? /s-
value
GROUND COVER LAND USE UPLAND EROSION CHANNEL EROSION AND
SEDIMENT TRANSPORT
(f) (c) (h) 0)
(10) (10) (25) (2S)
Ground cover does not n- ~More than SO'IG cult1v~ed a. More than 50,-. of th. .. Eroding banks continua
ceed 2()1}'G b. 'Almost all of area inten. area characterized by rUl ously or at frequent iD-
a. VeletatioD .p....; little sively grazed and cully or l8Ddslide tervals with large depths
or no litter e. All of ..ea recently erosion and long flow duration
b. No rock in surface soU burned b. Active he adeuts and de.
gradation in tributary
channels
(0) (0) (10) (10)
Cover not exceedinc 4O'T. .. Less than 25"G cultivated @About 2S;' of the area ~oderate flow depths, \}
.. Noticeable Utter b. So,-. or lea. recently characterized by rill aDd medium now duration
b. If trees preaea.t under- Incced lully or landslide erosion withoccasionaUy eroding
story not weU developed e. Leas tban SO% Intenaive- b. Wind erosion with depo- banks or bed
ly grazed sition in stream. channels
d. Ordinary road and other
Ih" /fJ? e./1 ti1 construction
V (-10) (-10) (0) (0)
.. Area completely protect- .. No cultivation .. N~ apparent aicnS of .. Wide shallow channels
ed by vegetation, rock b. No recent loggin& erosion. with n.t gradients and
(ragm.ents, litter e. Low intensity grazing short now duration
b. LltU. opportwtlty for b. Channels in massive
rainfall to reacb erodible rock. large boulders, or
material weU vegetated
e. ArtifiCially controlled
channels
Factor~ I /0 ID 16 10
value
I Subtntal (a) -(c) ("S' Subtotal (h) - (i) ;;2-1) T:~~~LG.32= )!.?-F.e.ft.ls.. mUyt.

(J"struCt;o,u on r~lJ~rs~)

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