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HomeMy WebLinkAbout08/03/2001, L-1 - JULY 18 MEETING: ZONE 9 ADVISORY COMMITTEE, SLO COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTR AGENDA NCIL CDD 7DIR® FIN I❑ FIR FLLAISON PURT O WRNEY LERLICE CHF July 23, 2001 0 DEPT`.H DS El REC DIR AILI ® UTIL DIR ❑ HR DIR To: City Council From: Iden Schwan Copies: Iden.Hamp° e McCluskey, Wayne eterson, Glen Matteson,Neil Havlik Re: July 18 Meeting: Zone 9 Advisory Committee, SLO County Flood Control and Water Conservation District I attended this meeting as our regular member Jan Marx had a scheduling conflict. Staff members Wayne Peterson, Glen Matteson and Neil Havlik were also in attendance. Presentations were made on two principal topics: (1) Resource Inventory Biology by the Morro Group; and RECEIVED (2) Waterway Management Plan by Questa Engineering Resource Inventory Bioloav SLO CITY COUNCIL Representatives of the Morro Group made presentations and passed out materials updating the Advisory Committee on their research findings to date on habitats,plants, wildlife and"reach by reach"conditions in San Luis Obispo Creek, East Fork of San Luis Obispo Creek, Prefinno Creek, Stenner Creek, Brizziolari Creek and San Miguelito (See Canyon)Creek. Also included was a summary of In-stream Habitat Statistics. Except for several exchanges between the presenter and Neil Havlik to clarify technical aspects of the materials, the remainder of the Advisory Committee accepted the materials for finiher review. (I have passed on my copies to Jan for her files.) Check with Neil Havlik should you have technical questions. aterwav Management Plan This presentation scared the socks off of me! I has been my understanding that the primary purpose of this watershed study was to discover how it "worked"in all kinds of rainfall conditions-especially those conditions that have historically produced floods downstream inundating San Luis Obispo. My confidence in the work took a nosedive as I listened to the presentation by a representative of Cuesta Engineering. First,he stated that the size of the storm that could pass beneath our downtown varied between 10 and 25 years;that is a variance of 150%. I indicated that that was an unacceptable variable, and we needed better information. The tunnel is of known size;the unknown factor is the velocity of the stream produced by a particular type of storm coupled with the condition of the watershed. I had always understood the tunnel capacity was rated at a 30—35 year storm. If it is only 10 years,we have a humongous problem. If it only 25 instead of 30 35 storm capacity we still have a problem albeit a bit less than that of a 10 year storm capacity. Page As the report moved to open field conditions further downstream which flooded, I was further alarmed to discover that after all of these months of study the presenter did not ow which side of Highway 101 the Sunset:Drive In Theater was located. Two pieces of information were passed out(Again, I have forwarded these to Jan)-one was entitled"Issues to Resolve for Fine Tuning SLO Phase H Project Description,"and the other was a proposed"Statement of Management Goals&Action Items." The Advisory Committee agreed that the idea proposed by the consultants to have a Goals Statement was worthy ofpursuing. A t grit:• I truly trust these "blips" that I picked up will be corrected with accurate data. When the 1 p73,flood hit SLO, I was Mayor. SLO was declared a National Disaster Area. I can tell you emphatically that flooding is a no fun experience! We need to prepare to stave off as much o,f°the flood threat as we can. It is a task that requires accurate data to provide that structures that exist in our flood prone areas will be properly corrected, and that new structures yet to be built will be constructed to survive a 100-year storm as a minimum. Significant amounts of public and private money will be required for these tasks and we must be judicial with such expenditures. Two engineering errors stand out in my vivid recollections of the '73 flood—one saved the city from significantly greater flood damage; the other caused major flooding of Lagunake homes. Both dealt with culvert sizing. The culverts running under 101 at Cuesta.Park were not designed to allow the passage of a 100-year storm. Consequently, Cuesta Parklled to a point just short of overtopping 101. Happily, it served as a make- ship impounding reservoir, As the culverts were undersized, they metered the amount of water that ran down San Luis Obispo Creek. Even though the flow was "metered" the quantify was still more than other structures (including the under-town tunnel) could pass and,f l ing of the downtown and downstream properties occurred. The second error was the sizing of the culverts under Madonna Road. The culverts were too small to allow the storm waters flowing into Lgguna Lake from Prefumo Creek and from the natural headwaters of the lake to exit. Consequently, the lake rose and flooded homes at the lake edge, Oceonaire Avenue and homes on the other side as well. (Rowboats were the vehicle of choice in that neighborhood.)Had the culverts been sized to pass a 100- year storm,flooding of the homes may have been prevented. Since then, the culverts have been expanded and I understand they are of a size to pass a 100-year storm—I certainly hope so. With the retirement of City Engineer, Wayne Peterson, the City is loosing a very, very significant part of our "institutional memory„of floods and flooding. We must be absolutely certain that the statistical data that these watershed studies bring forth are correct beyond a reasonable doubt. (Jan,you have a heavy responsibility on your shoulders.) I- OC METAL GUARDRAIL ADJACENT APARTMENT5 CLAY TILE TYP. ' 1 1 � Z r � u. GEMENT PLASTER, t TYP. 4 ~ \° tl 00 p oc 0 a �$ d,`6kt d Q 10 a An S a °? infor 0 4t c n✓o` $po o t�otQ�q l of tt �Y o f0 f o •4 O OCA . \ C o i 0Otwo ° all PP gyp, TRELLIS YV/ VINES OVER ENTRY ARCH - CEMENT PLASTER PLANTERS VVl CLAY TILE GAP CEMENT PLASTER FENCE - kV CLAY TILE GAP STI GAN (Aci lnut Street) ADJACENT APARTMENTS - Li LM,1.1 L 3 o o .."t $p -A&9z-4- TRELL15 IV VINES OVER ENTRY ARCH ✓GEMENT PLASTER PLANTE25 W/ CLAY TILE GAP GEMENT PLASTER FENCE CLAY TILE GAP (AVa Inut Street) 2x 'N , „ jQ r w t Y + 1 i k a 3 i, $ m. x� x ,x r ,. x 3 I ' rx ±.x x r i ` k r # P ! t x s e "xs fir' } x r fir+' ���r „ „•' z. �'� a"„ fy' ,rva,, "x�^ e�+ x a� x� x i s r i , x f y+ „ r til ? r, ' r3 , ie t Y K F w „ o , i' • ,:'. 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