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i <br /> �I <br /> � <br /> � <br /> � <br /> hIf:TCfl--�- 1 l::th St flp.�rt,,�[�ritt � I'•. li.l .: j� <br /> Ltf -t';49 ;)uly !�. .?Nv I ,:. , � . <br /> Downstream R�mof{ Analysis <br /> ii <br /> ' � �c:. <br /> The subjrcC pro��erty is ] orate�d nn thr nerth sidra of 112th Stl'i.�.'} i:! .� <br /> Lveret:t:. al�out 4!�0 feet weslc of 1:1-�e �o�.ithLioi.md lanr_s ef Intei-st�t� <br /> _. � ' c- . . . f-..i : �._ . ... , . <br /> .,. Frcrsent] y I l..th �t. i� 6ei ng i mpr ov�d and wi rJened, bi_it � � 4 k 'hot - � <br /> anl:icipa+_Fr� that dr��inaye rF.qi_iii�ements wi. 11 chang�. �lor+h di 'l.ha� <br /> ��rnp�rt,y lhertr arP scrv�ral �iav�lo��mrnts �_�nder crin=tri.ict:ion, and it <br /> is e;:pect�d that these will disr.h?r-g� t:o 5ilvei- Lal:e Creel: further <br /> norl:h. <br /> The runa{f irnm t.he propc�rl:y flows ihrnnyh a s�-ii�s of r_i.ilvnrts .�r I <br /> dit:ch�s, r.:•v�ant�ially .i��inxn�� oi:h�r si,7nifi.c��nt tloa�s in a natural <br /> ,tream channel , which ent�=r= �i 3h" diamrter conr_rete pip� <br /> disch��rging inte� Silve•r Lnlc�-�, ;a tnta.l dist:anr_e af ahout 70p11 fec�t. <br /> lhe total clrainaqe ba�.in for the point ui disr_he.rqrr aC Silver Lal:c <br /> i s ,ap;,i-o;:imal:el y 44h ar_r�.,•;. <br /> ThF� arr�a o{ 1lin propr-ri:y, A = 1 .�� acr•es. It ha�s twu ] ow are.�s <br /> =;i�l�jrrl: ho �nndin�3. and is ��res:ntly rlrainwd hy a� c��ncrei_e pipEt <br /> �mcier 112th St. It i , �<si.imed t:lie�t. F.h�� e;; isi_inq runof� corff , Ce = <br /> . 1(�. 7he {uturr_ runoff co�effieirnt, compui.r_d 6y propurtional <br /> �jrNa�=. ��here i�.�, ,�cr-�s will hecome gr.;iss al. C =. 0. 1:; and .8� acr .r.s <br /> will become impervious �1 C = i�.'?: Cf = . 6. <br /> Ti mc� of f:i.mceanl_ral:ion: <br /> Assumr a travel dir•tancF.• _ ���0 ierrt.; velc�city, fi-nm table for a <br /> �;lope oi i <br /> .i"!4_L=,;..7 �'Or� I <br /> ...-_-_..._... .-. �' �, pc�,.:r•nt. Vr_1 - .t.i`i -Ip�:;. 7c - In .�. .-- <br /> � �. .J '"'_._'__ <br /> ^Ilfl ((�(1) ( . (_ij) I <br /> Te = 13.92; Uc�•-ien �t,cn• m I = 1 .5� in/hr �i <br /> l;�:i.•;1: in�� Y'I.If10! ( ' I.S�� 1, . � ;: S . ::S .- Q2 = .Z1 cfs I <br /> f=�i1'.�_ire ri.inuff - 1 . ,.,.-. . . b s; t ... _ - Qf = 1.24 �fs <br /> Incr•ease ef p�eal r'i.inoff = 1 .��3 [fs <br /> TFie i-o�.itii7g oi downstream dr:�in�ge 1�-om I.he e�ite was invrastigated, i <br /> ��nd indiv�di.!.�1 romponr.nl:s; ��naly+ae�f lr.�r capacitv. in nrost: r_a���s it I <br /> wa!> nccc.�-;.:�ry tu eati.mai:e- rlope� and lenqths. ae; dei.;ailrrd dmsi.qn ' <br /> 1.flfOY'ffl:if.li�fl Wi:1'.i f10�. i1Vi�7. � i?�?] i'. P1rJF: rE�F�6�C11:aD5 a�crrr? PS�.t1llr3f13C� 1.15il.flC{ � <br /> n rnughne�;s vali.ie n -= i�. ��17. nnd nn inlEat r.unYrol coefficic�nt uf <br /> O. GI wass used. Cnti�anc�= anii e::it losses wc+re ��ss�.uned negli�,3il�le. <br /> !'�. The prcptarty itself and p�rliaps i.q� to l .�i ai rt•s r_�f adjoininn land i <br /> are dr;:iined l-hr��i.igh +� conr.�-ai:e pi�i�z, lfl " �.lia. apprnx . 105' <br /> Inny, from the proprrty to soiith ssi�Fa of 11'.:'I li �t. TFie elevation <br /> drrip fi-om �ntranr.e 1_0 oi.�lF�'+ll -= Q. 7 f�et. I�lil:h thia ini�..tke <br /> w�i:r.r surface elr_vation s�.i1'ficient t❑ covFrr i:he t:np of the pipe, <br /> 1=he f i�>w i:lirnuqh th�a pi pn a�ui.i] d be 7, ;:, i:+s <br /> D. Th�� r_oncrete pipe dir..charq�s into �n up�n dit�h, alonr� th�� �outh <br /> rirl�_� ii( 1. 1 ^l.h 3l . 1'Fi� ttf (er_live [russ s�r_tion (minimi_imI of 1-.hn <br /> ililc�i i ��s at�oi.it 1 foot der�p by b fcaet wide, and the slope is <br /> �t i �;,�. . ..� � ��-: /r. <br /> '�`- /l�ll��+/ �i, r rsi .. <br /> �Jriii <br /> � .��.s/ ����r/_'. <br /> � <br /> � <br />