|
<br />51
<br />
<br />52
<br />
<br />Table 6-4: Matrix of Recnmmeoded Channel Alternatives
<br />
<br />quality to downstream areas resulting from 110w concentrations within unlined area~.
<br />Selective improvements could create very similar disturhan<:es as channelization,
<br />howeverbccausetheirnprovemenlscanbeselcctivelysiled,avoidanccofdiSlurbancesis
<br />easier to achieve,
<br />A comparison of potential habitat disturbances for each of the concepts was
<br />conducted. With the esception of the channeliwtion concept(sl,the alternatives would
<br />cause minimal disturbances to the habita', ifimplcmcntcd, The disturbance of habital
<br />areas would be to mitigated by replantingnativc species afterconsttuction. It is not
<br />anticipated that implememation of any of the alternatcs would result in a lossofh.abitat
<br />value. Most disturbance would be temporary in nature, mostly occurring at tbe time of
<br />construction. Tbefloodplain pre>ervation concept bas tbepotential for affecting rhe 1 east
<br />amount of babitat disturbance. The losses wbichcan occur include the loss oflOe and
<br />bank vegetation over time from natural erosion of the invert and banks w hich are unlined.
<br />There are currently >everal locations along lhe major drainage ways where this is the
<br />situation.
<br />The least total areal disturbance resulls for the floodplain preservation or a
<br />>elective improvement concept. Loss of habitat would occur naturally. mainly along the
<br />toe and at low channel benches due 10 the long-term degradalion of the il1vert. and
<br />localized blll1k erosion. Water quality for the downstreamreaehes would not necessarily
<br />be improved by a floodplain preservation concept alone because of the potential fot
<br />sedimelll d"''Position due 10 natural erosion proces~s. For tile floodplain preservation
<br />concept it was consider<:d that ~ft"r a hank or in\ert failure a portion of the native
<br />veget.ation wouldevemually replace itsclf over a period of years.
<br />Implement.ation ofa selective improvement plan could result in an inc reasein
<br />habitat value as compared to the floodplain preservation concept. This is because
<br />selectiveimprovemenlS, ifcoflStructed prior to the onset of active nat ural bank and invert
<br />erosion, would prcventthe loss of native habitat along the existing low t10w banks an(j
<br />in floodplain areas, Disturbances due to construction could he beller controlled and
<br />minimized with a >elective improvement concept as compared to a dut<l"cliL.alioll
<br />concept.
<br />Develooment of the Recommended Plan
<br />Presented on Table 6"4 is a matrix representing the recommended plan for each
<br />major drainageway Kach, The selection of a recommended channd tr~atmcnt seheme
<br />hasbcen base<! UpOll thequahtative and quantitative infonnalion presemed thus far in the
<br />study process. Further refinement ""ill be Illade 10 the Plan pending age",;y ami
<br />individual review of the information presented and through the reliminary design
<br />
<br />1fl"!J1I1'1i;ml'
<br />;d+~"Xlgt y;,
<br />'~A ,""0"'-d
<br />''''',''"'''-'-'1
<br />p,.-,'<=IUl',;'
<br />'''></ "
<br />
<br />DW,A-O!
<br />DW-A.02
<br />DW-A-Q3
<br />DW.A-Q4
<br />DW,A-05
<br />DW_A-06
<br />"0";';'-''-'+'''-1,
<br />'\"0'''-'''--''
<br />";i>.-.-""t'~q,
<br />~n:PW:".-~~j'
<br />\+t;lW;Bi09:,
<br />~"" ',...., ,
<br />:'QWta'i:O:
<br />li''''"''''".-",,,,:,
<br />g;;nw,a.;)it;:
<br />UFDW,A,l2
<br />",HFl2~.-f\.-:,1J
<br />WSl'fuW,#:;I<l:
<br />ph".-,:..,;,;.-""
<br />"'SiiPW"A,15
<br />ilL,....;,;.-,.-",
<br />&W';lWrA'~il
<br />MFDW,A,li
<br />MFDW,A,IB
<br />MFDW,A,I
<br />MFDW,A,
<br />",.-......"".-.-.-
<br />:NFbW'"iii.:2)
<br />"Nr,dW~~
<br />NPnw,ti..Z~
<br />LFDW-A-24
<br />,y:tJ;Y:!~d5
<br />::aJffiw-1i::i6
<br />,L",....,.-..
<br />Wt.f'pW.;u;;&
<br />).,FDw-;tiicil
<br />'1FDW,a~
<br />CC-A-31
<br />CC-A,32
<br />,.-.-;.-',..,>1.-"",
<br />"c<:.a:.:13:'i
<br />":ce' ',,:;:;,::
<br />0,'""","",
<br />"c<:.il'-'~:,
<br />CC-B:-3fi.-
<br />..",,'<
<br />,;CC,.a-.JtiT
<br />('(".c-,s
<br />("C.(".3g
<br />cc.c.40
<br />
<br />lMi\j'W\It1jW-;II*illi'''''''':'!:.~'"i''i;'''''-'-'''''''''01I1i"l'!NUj(1'H
<br />" ',Nhl1Mr \!;"""""""",/;turernau~/ I" '''K''''
<br />,'~, ",' .";', ,"" ,..., "',,..,' 1 P '...- ...;"'''*
<br />)-'d'~~;m ';+i:'j;;;1jY'ii:<lli!!h;i~"w..-mjwgg'
<br />FPi:twvall<JO*i",',ClW'nllhza(K'iI\'n!iliird~dv~,h'"
<br />.-.. "..,,-;j.- ..,'...- ':1.." ,'..' '..<;:
<br />.. m,", ,... ';,
<br />
<br />.
<br />
<br />iiRF'!');1i\;m'14W: 'l1>I'I!m\"fW
<br />i!1rhf:iilhi~I"il1M:ii: 3jt ! <tlJy1f;1l1f!i
<br />""ill1tfr'?'I"''''''+'- 1.. ,I..""/ih....,.,'
<br />:,1:)"1'"'' 1);1; ";%11);: :\h:illill!'_iliJ0_Hi',,"_m;;
<br />,; /,'w"........, ~ 1"''''"..."
<br />ih !,;,,;t:)j:Hi, ,fl:bJr,h;m;;11!0i
<br />11!.- "ri'v"'<n" '-"'.~'~r,i'nmn'j,l:W!,
<br />,........'\','f'''m.'v"';FIIl1tIllL..;....;;n'
<br />';IT\'0""}/;;; w;; >< h 111"''';'-
<br />l' ", "''f!''~, N:; 'A~" %" .."""
<br />,;,"~~;m,;"" ill. ib, :,1_' W" ,m"
<br />
<br />.
<br />91jj4111ljmmllllll"'1:1'm1't'*f!(
<br />0lM,!lWUh9hi,;mE:i iMI'liiJ4!+i1hh!
<br />"R""ill!""- "I' 0<-'!ill1'
<br />:;jhjmliiglmm'illffi!h;ll11TII~ffi~f;l!l
<br />
<br />',0001%00-""0 'ml'!ll'"WIIlIll'I'
<br />',,,;1;""""0,"'1h/, .-:L,;" ':/1'"
<br />,", ",' ~"'O;;""~;:;; 0; > '1'j;" , ,--, 1
<br />:;;/"'11..""..............,..'1'1+,\1 ,,11.;
<br />",'n..'..""',"..-!H'rC'''.....,T''.........-
<br />>1'1"..::111.-.-""",;",:;1': ii,iiil','!IIl"'Sil-'l'!+:r::
<br />" "~""4"'1'0"" "=, '"" ,'<1%
<br />,'xffinlifli6 P"P':'m<1 J. XL. 0"
<br />.
<br />
<br />.
<br />
<br />.
<br />.
<br />
<br />.
<br />.
<br />;;111lli!j11'~Sl!JWI'1
<br />'I;;JIi,,!l~,t1ii;;!"h
<br />:"'id~"'A':R ~'
<br />He,1~hi(1),
<br />,:jdlig';1"",..,,:;,mp___
<br />,\1I"i01J;"?lii1-1pm
<br />:g1ipW;;rt::njiUhk
<br />:#Alll;;"'::;:uhd!
<br />,,,,1.,,',,.....,,''''''''1'
<br />',*",;;n"",.-u-,u-;w.
<br />.
<br />
<br />'1"I"""m'ill'
<br />, ''''''1/''
<br />, .. "','v
<br />, ,.-,,:iti:,hH.1
<br />'1'~H'<B",!n,
<br />1ifI1llJ.}lhomtM,
<br />.
<br />.
<br />.
<br />.
<br />""""''''''''Cl',~'~''j
<br />:\1h-*11i.,-\"dT'
<br />"'/ffil'-~'. 1"""*""
<br />'W'~"'''-''''"'''''I'
<br />hi ''''':'''In''''ffi
<br />" ''-'''..L1U;.-A
<br />, "'-""- ~''<:"
<br />i3, U!W*:,:nkli
<br />
<br />.
<br />:;n\!EJ1ml~~mj!t\i!ffi!ffittPjlllllll, :<<1' ;iI!lljPJi1iji11Elij1ml
<br />'y\ffi1!\ih~",--!WkF :hihHfjp'hb,dib !'M~I~iL">i!.F;0ii:
<br />n1i;'--:tHW1j,,,,,,pI!WNslnr"1j,,;.,,,;1t'lIDhU!I--''''H':il
<br />Jl''1/11idii~JMi!!mm "K'i"drt.:i1iL&n;L AJ!bIFi.<liD?qi1
<br />:;Q4'Jgnmmmlr!fllijij!111I111l11111l1ITi F:ITil1hijl""L"!1i!l
<br />i'I~j)I! k"h;,S;L- ;0"':// ~ ;;;.- ,.L,.UYiI,.,:j;mm;;
<br />".-UlI,(j~NHl"'\"'W 0/;0..\\:\1: " d.-, ;!klltll!l:,,JW1Il$ID
<br />*
<br />
<br />.
<br />::~j.",:):1iil!!1jm':!.-
<br />.,':i!;iiHr:':Jlt,;.-'
<br />'1,"'I-I''''''''"L,11''
<br />""iin.",,,,,,iC'
<br />';\J!!!-;;?Wni!.o..
<br />,:j.,..."..",""..""",,,
<br />.-h'l ;::<;;;1+,::'
<br /><n "",:;,,'
<br />..n ,,,,,,,..'"'
<br />:!!ih,,'::*,Y'
<br />
<br />ii~f:rjr,j.Jg!'1lli; ;~;~~!jr~;iID
<br />,/,v' 'IlHJ:1',:0' /'11' ,~~~" )""'"
<br />".... "":;' ", ..11",,,, 'i""
<br />110.1'1i" ".' ',K :~, ,;;1:11; '.;;'"
<br />'wk' '" ,;I)' eg;: ......, 0;"",
<br />:;:::::, "1>;1%L 011!'-- 4= '(01'
<br />T"'''"''1',,;!j ',,-; .. ,.1""1
<br />';l1l!,i'I\F'" '.." ,.. !iSh
<br />"um Ii;: ":"",
<br />
<br />.
<br />.
<br />.
<br />
<br />(I)Creek-R",,,,h.chanoelscghl<,"t#(Seehh,hiI2)
<br />
|