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i <br /> I <br /> i <br /> � <br /> �_�;I_i. m.i.. :�d .,I: :? ��cr:-c.r.�i�f=. Th�• 1c�n�:iLl�i i�s abo�_il_ :(�cj fen1-.. lher'ct er�e <br /> ' nu utl���r =-ignificanl�. inflowv�. tu i�.his channel .�prarti frem thr pipe <br /> li�Le�J -�buve ��nd lecal. ri.�nuff . The carryinq r.apacii:y of thic� <br /> r_f��ann� 1 , floi•�ing fii1. 1 is �bout 17 r_f�. <br /> C. Cunr_r��+e pipe, 10" di �a, ��t'i�rov,. f3n fe�et lon�.�, i.�nher pawerline <br /> road. ulopF� unl:own, but a��s�.�m�d downhill witli flow at : <br /> percent. Noi:e: pipe eni:rr�nr_e is parti��lly bloc4:ed by silt:. <br /> l"here are no c�thcr inflows to this pipe aparC from the open <br /> ditr..h. Fstimated flow 1:hrou�-�h pi.pea with wai:er surfar_e eleval:ion <br /> at top of pipe == 7.5 cfs <br /> P. Kun,�ff rnters Ehe Int:�rsl ��te ; right of way and is tran5portecl <br /> �ry .�-phu1,t-1 i ned �wol es and a 143" di.amete•' concrete pi pFs i nto <br /> the medi.�n �rra lieiwc-�F�n tl�e nnrtlihnund and �outF�bound lanes. iL <br /> ; �: _��iinr.d I.iy flow frc:im BilvPi- Lake Cr�ek (i:hr��ugh a c�_�lvert: no1: <br /> vi �,ible from publir..-acr.rssiblF areas) wliinc �on5titutes t:hr_ <br /> remaindrr nf the runoif fr•om the drein.age Li.+sin. <br /> TI-�c� niedian ar�� ha�. 5�i�stantia] capacity for ponding and <br /> rli�t.ention o4 r�.inoff . It, is F�StimatF�d tliat water r.oi.�ld puol in <br /> e::cess oi 12 feet over thr� c�.�lvert under the northbo�md lanes. <br /> br-�! or e Ir:aving the hi ��hw:ay r•i ght of Wc7Y- FaASf'�j on the topography <br /> availablce, this woulcl providr.� mort� thin ^.54.i�i�4 ef of storai�e. <br /> TI-ie ci.�lver�i: i�� ":f�° di .+mr�1:�?r. Wi Y.h 1:he enCr'anr_a covernd, length <br /> - 1�C� teet. elev drr.i�, .�se:�.imc�d = ,7 feet. the pipc� co�ild cai�ry <br /> abnul: 4':' cf��. Witl a t�i fonl he��d over thc� encrance the flnw <br /> H�o�ild be about 12<� r:f��. <br /> L. After crossiny the highway thr dr,aina9e entera �. 40t1 foot reach <br /> r�f nat�.�ral sti-eam6rd. The main r:hannel of the �Cream is 1-: <br /> fnet deep, 8-15 4eet wide, wit:h a ,end and o� ��.rl bottom. The <br /> •�la(tn � , estimal:ed 1:n hr:-� 2 t:n .' perr_ent ovri 'J,��r I ^nath of 1:he <br /> ch,�nnel . A��i�ming a unii�rm r_ross sectiun 1 foot deep, an � <br /> foat bottnm wid+th anil 9 fout: top toidth, a c_hannr_1 SlO�7B of �. 5 <br /> percent and a roughness coefficient ef . 04.�. gives a flow rate <br /> nf atini.�i: 4�� r_fs and an average velor_it:y nf 5 fps. The stream <br /> hac e:;cess capacity beyond the channel de�crited, as it L3B5 in <br /> a shal .low lighl:ly vegel.at:Pd valliay and overilow cnuld be <br /> arr_emodated without propr.-rty damagre. <br /> F. A1: Silver L�al:e Road i-h�a ri.inoff enl:nr•s anol:her� '6' diamei:er <br /> concrete pipe, appro;: imTtely 430 �ee� long, aihir_h dis�h2rges <br /> into Silver Lake. The inlet comfig�_iration nf thv pipe wo�tld <br /> alluw up lo approx . (? ff•PL of I��+ad ovAr thr� icip of pipe. <br /> Th� elevat.ion drop bet:ween Lh�z inlaf: �anr1 t:hF� outlet inverts <br /> i�� estimated at 1� �r:et. Allnwinq 7 ieret of head provides a <br /> cap��city ❑f l0O r..fs. <br /> SUI•Ih1l�RY �, <br /> The drainaqe struct�.ires immr�rliat.ely brluw the �+ropr�rty, which ' <br /> service le;s th��n 5 ar.rr:s ha�s .a ca�ai_ Il:y uf at le���k 7. 5 cfs <br /> which is more than adequatc�r for� any r•tandard design storm. <br /> Downstr•� +n, where lhF� toft�l �creagi= �er'vFd is i.�p tc ^44 acres, <br /> il�e e::ti e�me capacity nf tFi� dr�� nage systr�m tn thr lak:e is 100 �. � M. �' � , <br /> rfs or hr�1:1:�r . a�liich -+g.rin r- .�_fedr: -+ny ri.�nofi arpr�.ta+ i�n frort�^ Q,\ <br /> I.h,, .rea. oG�r',i" ��.; <br /> . <br /> S ��,,r ����� <br /> �o �t�069 '� ! <br /> ��%�f��'.�1..�•'���•\' a <br /> .� �{ <br /> '��►���Pll�� E;�C..•1 <br /> I <br />