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Bed-Material Sample Number Left side Center Right side Above bridge 8703 8704 8705 Below bridge 8706 8707 8708 No bed-material samples were available for this site, so samples collected during the same event at Coushatta, located about 50 miles downstream, will be used. Bed-Material Sample Number Left side Center Right side Above bridge 8703 8704 8705 Below bridge 8706 8707 8708 No bed-material samples were available for this site, so samples collected during the same event at Coushatta, located about 50 miles downstream, will be used. Bed-Material Sample Number Left side Center Right side Above bridge 8703 8704 8705 Below bridge 8706 8707 8708 No bed-material samples were available for this site, so samples collected during the same event at Coushatta, located about 50 miles downstream, will be used. Bed-Material Sample Number Left side Center Right side Above bridge 8703 8704 8705 Below bridge 8706 8707 8708 No bed-material samples were available for this site, so samples collected during the same event at Coushatta, located about 50 miles downstream, will be used. Bed-Material Sample Number Left side Center Right side Above bridge  c cH~z v r v y ~ } @@~P~IIINooookf@@@@@e@W@IIINooookf|:@y@?@^@I@IIINooookf|@2@@@`h@^@IIINooookf|<~P~UnknownNosssof?<~P~UnknownNosssof?m@<~P~OtherNoqqqmf?i@@@Y@Y@N@Q@IIINooookf c@@E@E@{Gz?{Gz?IINonnnjfGz@@@@@@@ȉ@y@IIINooookf ףp=@@<B@H@@@IIINooookf@@@G@G@$@pw@~P~IIINooookf?(@@<B@B@ |@~P~IIINooookf?t@@@A@A@.@D@^@IIINooookf@4@4@@@F@F@333333@@@@IIINooookf{@?F@F@>@$@9@IVYesooojf@@?=@=@i@Y@UnknownNosssofe@@< V@ V@IIIYespppkf xq@<0@0@F@IVYesooojf? `v@<8@8@IVNonnnjf? ̄@@<F@F@>@IIINooookf Gz@Rd@.@.@@@ffffffG@ffffffG@.@P@w@IIIYespppkf (\@q= +6@@@Q@Q@Q@~@IIINooookfq= ד@{G @$@$@<J@J@$@@@IIINooookf?<~P~UnknownNosssof?<~P~UnknownNosssof?<~P~UnknownNosssof?<~P~UnknownNosssof?<~P~UnknownNosssof?<~P~UnknownNosssof?<~P~UnknownNosssof?t    "'+/.3<>(d@?@333333F@333333F@F@$@K@IYesmmmhf=)\@SF@@@R@R@a@Q@INolllhf<Ș,@fj1@@@E@E@4@F@@]@IYesmmmhf;^)7@@b4@@?ffffff?P@P@$@=@~P~INolllhf?:@@@<@Ј@OtherNoqqqmf?|9< XB~P~UnknownYestttof'8h@??K@F@4@F@IIINooookf7@e@??N@N@D@>@IIINooookf6i@?H@G@>@^@~P~IVYesooojf?5e@8??S@S@N@>@IIINooookf4n@@@X@a@D@Y@IIINooookf3 g@P@P@>@Y@IVYesooojf2n@?9@9@>@$@IINonnnjf1q@??A@A@N@K@IIINooookf0#J{/2@0*1@@@K@K@@>@T@IIINooookf/#|ʁ@hہ@??33333V@fffffU@@T@D@INolllhf.' .@ 1@@@R@R@9@>@4@INolllhf-HPh1@{G/@@@D@F@$@4@7@UnknownYestttof,gfffff)@%@@@E@E@A@A@IIINooookf+p= ?^@\(^@@@G@G@@U@F@IIINooookf*=yX("@)\&@@@I@I@4@I@K@IIINooookf)Gz><@)\4@@@33333sT@33333sT@ b@`@IIINooookf(H@<M@M@IIYesooojf?'y@@@A@A@b@I@IIIYespppkf&Ѓ@@@A@A@b@I@IIINooookf%v@@<b@IIIYespppkf\$9(@@@H@H@ |@I@IIINooookf#@g@<4@I@IIIYespppkf?|"r@@@~P~IIINooookf! |@A@A@??A@~P~IIINooookf o@DD??D~P~IIINooookft       GnFEdEB On April 28, 1993, bed samples were collected from the main channel at selected intervals along three channel cross sections. Individual samples with similiar characteristics were combined for gradation analyses. The following is a brief description of the bed samples collected : Cross Section no. Distance upstream(ft) Sample no. C]ףp= @)\@?@N@N@F@IIIYesRiprapRiprapxpkf\@@G@G@IIINoRiprapRiprapwokf[Q@Q@??@@(@@IVNoRiprapRiprap~vnjfxܘ@Ĕ@@tt(\E@(\E@ttIII0mmmkf y(\@(\]@@ ףp= ?P@P@AredDisplayIIINoNoneNone{uokfi@Unknown0qqqof'Rp= W@@(\?YS@YS@>@F@B@@@IVYesRiprapRiprapwojf5e@ColumnHiddenDecimalPlacesRequiredDisplayUnknown0qqqof#Pp@@?8@8@A@$IIINoNoneRiprap}uokfOa2U0*|@Qh|@@ @J@M@ XB333334@M@INoUnknownUnknown~ulhfN@P@@@@@@F@IVYesooojfMA@@ C@ C@F@IVYesooojfJ@a$$@@G@G@D XB|@|@IIINoNoneNone{uokfI@@@.@.@@@P@P@.V@IIIYespppkfH g@@@fffff&C@fffff&C@F@OtherYesrrrmfG=yXr@MStr@@?LW@YF@I@4@I@IYesmmmhfFiqjg@ΪVg@@@@P@@P@>@D@N@IIINooookfEH.!.@E&@@@C@ffffffB@Y@4@INolllhfDJ4Q@5v!@@?33333sH@33333sH@2@$@I@IYesmmmhfCHPsT@ۊeV@@@X@X@@P@D@T@IYesmmmhfB"@ffff朅@@@O@O@@L@IIINooookfAp= K@\(K@@?<@<@<@$@INolllhf@z6>W{@H}8z@@@yQ@Q@F@@P@F@IIINooookf?=U^@M O$_@@@̌L@fffffJ@$@9@IIINooookf  @ @ @ @ @ @ @ @ @ @ @           !"#$%&'() * + , - ./0123456789:;<=>?@ABCDEFGH I J K}L~M N OPQRSTU@V<WgXY[\] 1 Bed at about mid- span between bents 16-17L. 1 100 2 Bed in vicinity of main piers 17-18L. 2 500 3 Mid-channel. 2 500 4 Left part channel. 3 900 5 Mid-to-left part channel. The right part of the channel bed at cross sections 2 & 3 seems to be mostly silty clay. Bed sample no.1 was used for bents 14-16R and sample no.2 was used for main piers 17-18R. For pile bent 12-13R, the material is a clay with a cohesion of about 240 lb/ft2 and an angle of internal friction of about 27 degrees, as determined from shear-strength tests on Sept.20, 1991.  @ @ @ @ @ @ @ @ @ @ @           !"#$%&'() * + , - ./0123456789:;<=>?@ABCDEFGH I J K}L~M N OPQRSTU@V<WgXY[\] 1 Bed at about mid- span between bents 16-17L. 1 100 2 Bed in vicinity of main piers 17-18L. 2 500 3 Mid-channel. 2 500 4 Left part channel. 3 900 5 Mid-to-left part channel. The right part of the channel bed at cross sections 2 & 3 seems to be mostly silty clay. Bed sample no.1 was used for bents 14-16R and sample no.2 was used for main piers 17-18R. For pile bent 12-13R, the material is a clay with a cohesion of about 240 lb/ft2 and an angle of internal friction of about 27 degrees, as determined from shear-strength tests on Sept.20, 1991.1 Y&NY Y  Y  ( Y Y Y  Y $Y Y   Y  <(Y  (Y  0Y  8Y  @Y HY P Y ( Y t(Y XY `Y hY pY x Y gID SiteIDMeasurementNoAbutmentDateTimeUPDSScourDepthAccuracySedTransVelAtAbutDepthAtAbutQBlockedAvgVelBlockedAvgDepthBlockedEmbankLengthDebrisEffectBedMaterialD16D50D84D95 SigmaCommentsYYY6Y NoDupsPrimaryKey"SiteAbutmentScour SiteID span between bents 16-17L. 1 100 2 Bed in vicinity of main piers 17-18L. 2 500 3 Mid-channel. 2 500 4 Left part channel. 3 900 5 Mid-to-left part channel. The right part of the channel bed at cross sections 2 & 3 seems to be mostly silty clay. Bed sample no.1 was used for bents 14-16R and sample no.2 was used for main piers 17-18R. For pile bent 12-13R, the material is a clay with a cohesion of about 240 lb/ft2 and an angle of internal friction of about 27 degrees, as determined from shear-strength tests on Sept.20, 1991. [5 o * zk;Bridge-section composite sample, colBridge-section composite sample, collected along the upstream bridge face.Bridge-section composite sample, collected along the upstream bridge face.Bridge-section composite sample, collected along the upstream bridge face.Bridge-section composite sample, collected along the upstream bridge face.D16 was less than 0.002 See comments for US1000a.D50 was less than 0.002 See comments for US1000a.D16 was less than 0.002 See comments for US1000a.Bed material samples were collected at the St. Louis gage by the USGS Missouri District. 1200 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. 1000 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. 700 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. 500 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. 200 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. average for dayBed material samples were collected at the St. Louis gage by the USGS Missouri District. 1400 ft from right bankBed material samples were collected at the St. Louis gage by the USGS Missouri District. 1000 ft from right bank On November 18, 1991, bed samples were collected from the main channel at selected intervals along three channel cross sections. Individual samples with similiar characteristics were combined for gradation analyses. The following is a brief description of the bed samples: Cross section no. Distance upstream (ft) Sample no. Comments ------------------------- -------------------------------- ---------------- -------------------- 1 0 1 Mostly gravel, some sand. 2 300 2 Mostly gravel. 3 550 3 Mostly sand. From available bed samples, the bed material seems to be gap-graded, indicating a mixture of uniform sand and uniform gravel. Bed sample no.1 was considered most representative of the bed material at the base of pier Nos. 4- 6. On November 18, 1991, bed samples were collected from the main channel at selected intervals along three channel cross sections. Individual samples with similiar characteristics were combined for gradation analyses. The following is a brief description of the bed samples: Cross section no. Distance upstream (ft) Sample no. Comments ------------------------- ----------------------- ww[LVAL o @The reference surface used to determine the depth of abutment scour was the concurrent ambient bed. Therefore, the depth of abutment scour reported is additional local scour below the depth of contraction scour. For this site, it appears that the scour holes may interact as there is only one or two depth measurement between the holes that define the ambient bed. There was significant flow from the left upstream flood plain through the bridge opening. This flow from the left flood plain significantly skewed the flow through the bridge opening, about 50 degrees on the average. Refer to maps and sketches included in Other Detailed Data. Measurements numbers 1 andThe reference surface used to determine the depth of abutment scour was the concurrent ambient bed. Therefore, the depth of abutment scour reported is additional local scour below the depth of contraction scour. For this site, it appears that the scour holes may interact as there is only one or two depth measurement between the holes that define the ambient bed. There was significant flow from the left upstream flood plain through the bridge opening. This flow from the left flood plain significantly skewed the flow through the bridge opening, about 50 degrees on the average. Refer to maps and sketches included in Other Detailed Data. Measurements numbers 1 and 4 were made during a discharge measurement along the upstream face of the bridge. The depths were measured with a sounding weight. All other measurements were made using an echo sounded mounted on a knee-board. The board was floated from upstream to downstream under the bridge. The measurements reflect the depths at the upstream or downstream face of the bridge. All hydraulic information is from the one discharge measurement. The velocity at the abutments was much higher on 4/5/97: Left - 5.1 ft /sec Right - 5.9 ft/sec Embankment lengths were determined by projecting the measured water surface elevation onto the approach section from the BRW WSPRO model.The reference surface used to determine the depth of abutment scour was the concurrent ambient bed. Therefore, the depth of abutment scour reported is additional local scour below the depth of contraction scour. Based on the cross sections from the bridge plans there appeared to be little contraction scour. Elevation of reference surfaces used: 4-4-97 1030 4-5-97 1029 4-9-97 1029 The rightmost pier may have had some influence on the depth of scour at the right abutment. It is difficult to separate its effect from the abutment. The abutment had the major effect and all scour is credited to the abutment with no scour reported for the pier. The velocity reported for  at the abutment is the maximum velocity observed in the area of the scour hole. Note that the velocity dropped considerably at the right abutment as the scour hole depth increased causing an increase in the flow area. The velocity at the left abutment held steady as did the depth and shape of the scour hole.The cross section at the bridge is deeper on the left side, which could indicate 1-2 ft of abutment scour, but the location of the pier also complicates the scour pattern and makes separating scour components difficult. All scour was classified as contraction scour since the site was both horizontally and vertically contracted.7eML K-JT >yC*dBA@Y2RightUpstreamUnknownUnknownUnknownY1UnknownUnknownUnknownUnknown9@ R@*@@@2LeftDownstreamUnknownUnknownUnknownP1UnknownUnknownUnknownUnknown@ R@(@@@1LeftUpstreamLive-bedUnknownUnknownMY@pM<( 1UnknownUnknownUnknownUnknownI Y@@?ffffff@,@pMd@Q?333333?ffffff?q= ףp?( 6LeftUpstreamLive-bedUnknownUnknownߏ?IX@ffffff@?@,@pM@c@Q?333333?ffffff?q= ףp?( 5LeftUpstreamLive-bedUnknownUnknownߏ?IX@@?*@pMa@Q?333333?ffffff?q= ףp?( 4LeftUpstreamLive-bedUnknownUnknownߋ? I Y@$@?ffffff @5@pM@Q?333333?ffffff?q= ףp?( 3RightUpstreamLive-bedUnknownUnknownߏ? IX@ffffff@? @333333/@pM@Q?333333?ffffff?q= ףp?( 2RightUpstreamLive-bedUnknownUnknownߏ? N Y@?@@ffffff@6@pMp@X9v?333333?q= ףp?Q??6LeftUpstreamLive-bedInsignificantUnknown$@N Y@??@ffffff@9@pMp@X9v?333333?q= ףp?Q??5LeftUpstreamLive-bedInsignificantUnknown$@N Y@UUUUUU?@@ffffff@9@pMp@X9v?333333?q= ףp?Q??4LeftUpstreamLive-bedInsignificantUnknown$@N Y@?&@@@;@pMx@X9v?333333?q= ףp?Q??3RightUpstreamLive-bedInsignificantUnknown$@N Y@?@@@?@pMx@X9v?333333?q= ףp?Q??2RightUpstreamLive-bedInsignificantUnknown$@N Y@UUUUUU? @@@>@pMx@X9v?333333?q= ףp?Q??1RightUpstreamLive-bedInsignificantUnknownP@IX@333333@?+@pM @Q?333333?ffffff?q= ףp?( 1RightUpstreamLive-bedUnknownUnknown@ߋHpM<( 1UnknownUnknownUnknownUnknownL@dLVAL pLLϛȈ100-yr Left Abutment Ae Qe Ve a' Ya Fr Ys 2509 1896 .76 470 5.34 .06 (*) ft (*) - Because velocity and Froude number are relatively small, abutment scour is presumed to not occur. 100-y100-yr Right Abutment Ae Qe Ve a' Ya Fr Ys 3077 2264 0.74 605 5.09 .06 100-yr Right Abutment Ae Qe Ve a' Ya Fr Ys 3077 2264 0.74 605 5.09 .06 (*) ft (*) - Because velocity and Froude number are relatively small, abutment scour is presumed to not occur.100-yr Left Abutment Ae Qe Ve a' Ya Fr Ys 2509 1896 .76 470 5.34 .06 (*) ft (*) - Because velocity and Froude number are relatively small, abutment scour is presumed to not occur. 100-yr Right Abutment Ae Qe Ve a' Ya Fr Ys 3077 2264 0.74 605 5.09 .06 (*) ft (*) - Because velocity and Froude number are relatively small, abutment scour is presumed to not occur. 500-yr Left Abutment Ae Qe Ve a' Ya Fr Ys 3027 2355 .78 470.5 6.43 .05 (*) ft (*) - Because velocity and Froude number are relatively small, abutment scour is presumed to not occur. 100-yr Right Abutment Ae QeNo measurement or computations of abutment scoNo measurement or computations of abutment scour were made at the Galvin Road overflow bridge.100-yr Left Abutment Ae Qe Ve a' Ya Fr K1 Theta K2 Ys 1603 6250 3.9 226 7.09 .26 .55 70 .97 23.7 ft Because ratio of a'/Ya exceeds 25, use Eqn 25 from Hec-18 for left abutment scour - Ys=18.1ft Adjust calculated scour for abutment scew from fig11, HEC-18, theta=70, adustment=.91 Ys=16.5 ft 100-yr Right Abutment Ae Qe Ve a' Ya Fr K1 Theta K2 Ys 3229 10302 3.19 541 5.97 .23 .55 110 1.03 27.6 Because ratio of a'/Ya exceeds 25, use Eqn 25 from Hec-18 for right abutment scour - Ys=14.7 Adjust calculated scour for abutment scew from fig11, HEC-18, theta=110, adustment=1.03 Ys=15.1 ft 500-yr Left Abutment Ae Qe Ve a' Ya Fr K1 Theta K2 Ys 2016 7753 3.85 233.5 8.63 .23 .55 70 .97 26.2 ft Because ratio of a'/Ya exceeds 25, use Eqn 25 from Hec-18 for left abutment scour - Ys=21.3ft Adjust calculated scour for abutment scew from fig11, HEC-18, theta=70, adustment=.91 Ys=19.4 ft 500-yr Right Abutment Ae Qe Ve a' Ya Fr K1 Theta K2 Ys 4232 13954 3.30 548.7 7.71 .21 .55 110 1.03 31.5 Because ratio of a'/Ya exceeds 25, use Eqn 25 from Hec-18 for right abutment scour - Ys=18.4 Adjust calculated scour for abutment scew from fig11, HEC-18, theta=110, adustment=1.03 Ys=19.0 ftSubstantial road overflow areas on both floodplains and dredge banks on both tops of banks preclude abutment scour. No measurement or computations of abutment scour were madeSee comments on measurement no. 1.See comments on measurement no. 1.See comments on measurement no. 1.See comments on measurement no. 1.See comments on measurement no. 1.  @ @ @ @H8I8I:I< I> I@ IB M8 N8N:N<N>N@NBP8R8R:R<(R>(S8(U8(V8AV:(W8W:X8X:Y8Y:\8(]8(vgVelBlockedAvgDepthBlockedEmbankLengthDebrisEffectBedMaterialD16D50D84D95 SigmaComments80 1 Represents right part of channel beginning near station 8180 1 180 2 Represents left part of channel ending near station 8180. 2 1,200 3 Within main flow of low-water channel, from tip of 4th jetty upstream to about 100 ft right. 2 1,200 4 Right part of channel, 175 ft from tip of 4th jetty to RWE. 2 1,200 5 Near upstream end of 4th jetty. 3 2,100 6 At upstream end of sand/gravel   @ @ @ @          (A (!("(#(%(&(nfoShortTypeni~~~~YYIdParentIdName         bar, all samples here combined. No bed samples were obtained at the piers due to debris, etc. Based on rod probings at the piers, the material at the base of the piers is thought to be mostly gravel with some sand and debris. Also, soil borings by the MDOT indicate gravel. Therefore, bed sample no. 6 was selected as representative.  @ @ @ @HIII I I I M NNNNNNPRRR(R(S(U(V(VAWWXXYY\(](----------------- -------------------------------- ---------------- -------------------------------- 1 180 1 Represents right part of channel beginning near station 8180 1 180 2 Represents left part of channel ending near station 8180. 2 1,200 3 Within main flow of low-water channel, from tip of 4th jetty upstream to about 100 ft right. 2 1,200 4 Right part of channel, 175 ft from tip of 4th jetty to RWE. 2 1,200 5 Near upstream end of 4th jetty. 3 2,100 6 At upstream end of sand/gravel % YTN (-T!ZY Y  Y  (Y Y Y Y   Y Y (Y  0Y  8Y  @Y  HY  P Y H( Y PPKeySiteMeasureNoDateYrMoDySamplerD95D84D50D16SP ShapeCohesionCommentsgkteenobotDSuhYYY6 NoDupsPrimaryKeySiteBedMat bar, all samples here combined. No bed samples were obtained at the piers due to debris, etc. Based on rod probings at the piers, the material at the base of the piers is thought to be mostly gravel with some sand and debris. Also, soil borings by the MDOT indicate gravel. Therefore, bed sample no. 6 was selected as representative. _5 g " On October 4-9, 1991, bed samples were collected from the main channel at selected intervals along three channel cross sections. Individual samples with similiar characteristics were combined for gradation analyses. The following is a brief description of the bed samples collected : Cross section Distance upstream Sample Comments No. (ft) No. -------------------- ---------------------------- ------ -------------------------------- 1 100 1 Represents right part of channel beginning near station 8180. 1 100 2 Represents left part of channel ending near station 8180. 2 1,100 3 Within main flow of low-water channel, from tip of 4th jetty upstream to about 100 ft right. 2 1,100 4 Right part of channel, 175 ft from tip of 4th jetty to RWE. 2 xP @Ps] `H@Ps