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Last modified
1/26/2010 2:21:00 PM
Creation date
10/12/2006 1:24:33 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8210.470
Description
Pacific Southwest Interagency Committee
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
10/1/1968
Author
Unknown
Title
Report of the Water Management Technical Subcommittee - Factors Affecting Sediment Yield and Measures for the Reduction of Erosion and Sediment Yield - October 1968
Water Supply Pro - Doc Type
Report/Study
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<br /> <br />001396 <br /> <br />FACTORS AFFECTING SEDIMENT YIELD IN THE PACIFIC SOUTHWEST <br /> <br /> Levels - SURFACE GEOLOGY SOILS CLIMATE RUNOFF TOPOGRAPHY GROUND COVER LAND USE UPLAND ERO <br /> (10) . (10) (10) (10) (20) (10) (10) 1 (25) (25) <br /> a. Marine shales a. Fine textured; a. Storms of several a. High peak flows a. Steep upland slopes Ground cover does a. More than 50% I a. More than 50% of a. Eroding banks can- <br /> and related mud- easily dispersed; days' dura t ion per unit area (in excess of 30%) not exceed 20% cultivated the area char- tinuously or at <br /> stones and silt- saline-alkaline; with short periods b. Large volume of High relief; little a. Vegetation sparse; b. Almost all of i acterized by rill frequent intervals <br /> High stones. high shrink-swell of intense rain- flow pE:'r unit or no floodplain little or no area intensiv~ly and gully or with large depths and <br /> characteristics. fall. area development litter grazed I landslide erosion long flow duration <br /> b. Single grain silts b. Frequent intense c. All of area rJ- b. Active head cuts and <br /> b. No rock in surface cently burned ~ degradation in trib- <br /> and fine sands convective storms soil <br /> , utary channels <br /> c. Freeze-thaw i <br /> occurrence <br /> , <br /> .. I <br />i <br />, <br />! <br /> (5) (5) (5) (5) (10) (0) (0) (10) (10) <br /> a. Rocks of medium a. Medium textured Storms of moder- Moderate peak Moderate upland Cover not exceed- Less than 25% a, About 25% of the a. Moderate flow depths, <br /> a. a, a. a. medium flow duration <br /> hardness soil ate duration and flows slopes (less than ing 40% cultivated area character- with occasionally <br /> b. Moderately b, Occasional rock intensity. b, Moderate volume 20%) a, Noticeable litter b. 50% or less ~e- ized by rill and eroding banks or bed <br /> Moderate weathered fragments b. Infrequent con- of flow per unit b. Moder~te fan or b, If trees present cently logge gully or land- <br /> Less than 50% .in- slide erosion <br /> c, Moderately frac- c. Caliche layers vective storms area floodplain develop- understory not c. <br /> tured ment well developed tensively grazed b. Wind erosion with <br /> d. Ordinary roa~ and deposition in <br /> other constrqction stream channels <br /> ! <br /> j <br /> .. j <br /> ! <br /> I <br />, (0) (0) (0) (0) (0) (-10) ( 10) (0) (0) i <br /> a, Massive, hard a. High percentage a. Humid climate with a, Low peak flows a. Gentle upland a, Area completely a. No cultivation a. No apparent signs a. Wide shallow channels I <br /> formations of rock fragments rainfall of low per unit area slopes (less than protected by veg- b. No recent logging of erosion with flat gradients, , <br /> I <br /> b. Aggregated clays intensity b. Low volume of 5%) etation, rock c. Low intensity short flow duration I <br /> Low b. Precipitation in runoff per unit b. Extensive alluvial fragments, litter grazing b. Channels in massive I <br /> c. High in organic <br /> form of snow plains Little opportunity , <br /> matter area rock, large boulders i <br /> c. Arid. climate, low c, Rare runoff for rainfall to or well vegetated i <br /> intensity storms events reach erodible c. Artificially controlledj <br /> d. Arid clilt1.a.te; rare material channels i <br /> convective storms <br /> <br />SION <br /> <br />I <br />CHANNEL EROSION & <br />SEDIMENT TRANSPORT <br /> <br />Sediment Yield <br /> <br />A <br /> <br />B <br /> <br />C <br /> <br />D <br /> <br />E <br /> <br />F <br /> <br />G <br /> <br />H <br /> <br />. <br /> <br />THE NUMBERS IN SPECIFIC BOXES INDICATE VALUES TO BE ASSIGNED APPROPRIATE CHARACTERISTICS. <br />THE SMALL LETTERS a, b, c, REFER TO INDEPENDENT CHARACTERISTICS TO WHICH FULL VALUE MAY. BE ASSIGNED. <br /> <br />.. <br /> <br />IF EXPERIENCE SO INDICATES, INTERPOLATION -BETWEEN THE 3 SEDIMENT YIELD LEVELS MAY BE MADE. <br />
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