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HomeMy WebLinkAbout09/30/1991, 1 - FLOOD MANAGEMENT IIIH�IyIII��IIIIInII city MEETING DATE: c� of san tuts oBispo Sept. 30 1991 COUNCIL AGENDA REPORT ITEM NUMBER: / FROM: David F. Romero, Public Works Director 4�1_�Vr� SUBJECT: Flood Management BACKGROUND: On October 30, 1990, the City Council reviewed a report updating the status of the 1983 Flood Management Policy Standards and Action Plan. The Council asked staff to prepare supplemental information regarding floodproofing. This information was presented to the Council at an adjourned meeting held May 14, 1991. At that meeting, the Council continued the matter for a field trip to review implications of the construction of an upstream detention dam and its effect on possible creek widening implied under the currently adopted Plan. Only three Council members were present at this meeting, however, they asked that staff set up a field trip to view the proposed damsite and selected areas along San Luis Creek., DISCUSSION: Current adopted policy calls for widening San Luis Creek a sufficient amount to handle a 40 year storm between Cuesta Park and the confluence with Stenner Creek (near Marsh/Higuera intersection) . From this point to the south city limits, the policy calls for the creek to be widened to handle a 50 year storm. The approach followed by staff in considering upstream detention was to design a dam with a pipe through it so as to permit a limited release during intermediate and major storms. The pipe through the dam would be of such a size that San Luis Creek through the main portion of the city would not have to be widened. Below the confluence, where major unrestricted flows from the Foothill area join San Luis Creek, the amount of creek widening required to handle the design storm would be significantly reduced from the current plan. The field trip, led by Public Works staff, will visit the proposed damsite and selected typical locations along San Luis Creek in order to give the Council a feel for the physical implications of each alternative. Attachment: cross-sections fl000mgmVd1r#31 tis � �\ ✓ 1 � � \ �` / r•a \ I ,, � 6ti / is ,,``` , ..,.W Y � � r�i i �.\\ 11 �' \ �`/r i "^ \ �• � -��. rte.,.. l � � �• �� .a r.� �n � O O D O O LOCATIONS: 0 0 � o a O O O 1 North of Toro Street 2) Dana Street y � • ��%\F, � 3) North of Bianchi Lane O0 0 _ 4) South of Bianchi Lane O �.• O O � 5) North of Madonna Road 2 C C 6) @ Cemetery Mausoleum I i v00 O O o O 000 7) North of Elks Lane)8 @ Trailer Park O O � 9) South of Elks Lane @ 4 O Cemetery O aoo < 11 11 D O 10) North of Margarita Y00 3 .. .D OoDoO�C� - � El ❑❑D D D PLEASE NOTE: (� All sections are viewed € C Ell locking DOWNSTREAM ''� cnooc c•. • Y : V $ M � y 1 1 5 w I ewenoa�� 0 IF LOMk.4 W -I O• N � cNuw�511_.bRIkE�: I 1 oas�VRIVE I L _ T � - C O Y c o W o w� $o C.) © J y a0i n m C fa Z E Q c V) p +� 3 0) a .5 LL. L' C 5 O ~ o o Z .F.. -a N N Q1 o " W L °o C C ( Z v J Q N N V a. g o 0 0 o t— N N N N N g M N O N N N N N W o ° o W $ U +� c � a J � rn '1 o � o o Z � N N Q c a s cnLL v i 0 3 $ S Z - -oa N 04 P v N V V c O w v o V) o J L- a o C c m g m 93 g o 0 0 0 $0 a © Y m o W m W U l N ll 5 m 111 a E J C _ 11111 a � N c Z J � i 1111 � l � Q •— ami 11111 ; n ll ; L 11111 o ,CA 1111 0 ilii $ ll 0 o 1 0 l $ Z m v N N 0 4. 0 o � �LLJ Y V) L J Z 0 o 0 o g o N oo g o 0 r° co o n CM W. r T r r /_l 0 0 ao ao r r c 0 v 6 g o g r � r rrm 111 1 c c Y r r w l l 1 LLL Of 111 11 U 111 ll 1ill 1111 till : C 11111 o � 11111 c E J J 11111 `D c hill `D Z 11i1 11l a s a 1 v, li cm p m._ c 3 o N N O O Q1 g � U c F o Ow 0 8 S o J � N N V CL O O m m O O O O r r m W 1r N m t t 1O N r r r r r r r r r r C O i xO O O X in Y W till w ilt © ill U l p VI m o c Q N a N � m C L O W N O O U v O N C4 -J Q U_ 0.. I-- 0 o m m p g � g MQ 7 V 6 ll 0 It ltl c g 111 o till ltl lilt rTmll Y 1111 ULIJ W till till w U O 0 E J W r. o Zp v Q c a� c CD 0 a C a ` O 0 3 O 'O p p ; O C 8 ° o w ° N V) o `. J Z Q U_ a. o p F- m m CD p o p m H g O N p F)N M N C O x8 W O rrmw LJ `D ill `D w U J . O- N N o z J E v ll � LL- 111 O W o S ill S 111 till 1 ill O 111 O O O till N N C til l 13 V L O ill Lv O o tll Z 11 J 1 Q m m U CL 0 0 o O M N O M N O 0 6 0 0 30NU rrm Y til I i U CL 0 G m N G L �cc Q v 0 i N � LL. c LO c O C 3 ti o ttl p lit o till o O co lill ' 8 Illi $ Illi Illi U W o ltl N lit � O J 1t1 U � lit � O t o I— o m m C3 O 11� N O ri N o g C O N o O r ti x W l O Y llt W © W 111 m `D 0: tlt U 0 111 U) tl� l J m 111 It tlllv Z U v llt a o tltl a (n ® � 111 iiii �- c 3 CIO g� liii 0 0 ° � J lii 111 Z c 1 0 It N � Y N UW 0 LLJ v !n O Q -P m ro (L U) 0 0 N O fn O .- r r C O �D S m W �8 O � aD O 0 L © V) It N N W LLJ ami L) W y c l a 1 0 V �° l c l m i O c U 3 0 W V) v 0 0o U v O g w L.O z M N O d MOI N O r !-13