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Report of Flooding and Flood Related Damaged REPORT ON FLOODING AND FLOOD RELATED DAMAGES SANTA CLARA COUNTY JANUARY 1 TO APRIL 30, 1982 Santa Clara Valley Wder Dislrid: Sanla (lara Valley Waler Oislricl 5750 ALMADEN EXPRESSWAY SAN JOSE, CALIFORNIA 95118 TELEPHONE (408) 265-2600 Septemher 1, 1982 To: Santa Clara County Board of Supervisors Santa Clara County Executive All City Council Members within Santa Clara County All City Managers within Santa Clara County I am enclosing for your information the District "Report on Flooding and Flood Related Damages" in Santa Clara County for the period January 1 to April 30, 1982. 'n1e purpose of the report is to provide generalized information on those areas in the County which experienced flooding this year as a result of the January and April storm periods. The report is used to help the District obtain disaster relief funds and to assist the District's Flood Control Advisory Committees in setting priorities and understanding flood problems. You will note that virtually every area in the county experienced some flooding as a result of one or the other of these storms. It is my hope that this report will serve as a guide to your planning department when considering development in those areas of your community that are subject to flooding. The District Flood Control Unit can provide more specific information on the flooding covered in the report. We look forward to working with you and your staff on all matters affecting the potential for flooding in your community. Sincerely, ~l/}#'t.- O;~~~_~. O'Halloran General Manager Enclosure AN AFFIRMATIVE ACTION EMPLOYER - ,.ililif REPORT ON FLOODING AND FLOOD RELATED DAMAGES IN SANTA CLARA COUNTY ... "'" - ,- - - - \. - .. .. ,<iliiiiiiI '. !IIIII/l ., .... ;- - January 1 to April 30, 1982 Prepared by John H. Sutcliffe Acting Division Engineer Operations Division With Contributions From Michael McNeely Division Engineer Design Division and Jeanette Scanlon Assistant Civil Engineer Design Division Under the Direction of Leo F. Cournoyer Assistant Operations and Maintenance Manager and Daniel F. Kriege Operations and Maintenance Manager August 24, 1982 DISTRICT BOARD OF DIRECTORS .. .. Arthur T. Pfeiffer, Chairman Patrick T. Ferraro Robert W. Gross Maurice E. Dullea - District 1 District 2 District 3 District 4 James J. Lenihan SiQ Sanchez. Vice Chairman Audrey H. Fisher District 5 At Large At Large TABLE OF CONTENTS PAGE INTRODUCTION ................................................... 1 STORM OF JANUARY 3-5, 1982 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 .. STORMS OF MARCH 31 THROUGH APRIL 13, 1982. . . . . . . . . . . . . . . . . . . . . . . . . . 7 SUMMAR Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 .. TABLES 1'lftl I Storm Rainfall Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 - II Historical Rainfall Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 ,'W III Channel Flood Flow Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 IV Historical Streamflow Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 vAiiil V January 3-5, 1982 Damage Assessment Summary .................. 18 VI March 31 - April 13, 1982 Damage Assessment Summary. . . . . . . . . . . . . 19 ~}iI1ii VII Summary of Flood Related Damages ........................... 20 - JANUARY 4, 1982 FLOODING MAPS ,"Ilt, San Francisquito Creek Adobe Creek Tennant and Corralitos Creeks West Little Llagas, East Little Llagas, and Edmundson Creeks near Morgan Hill Llagas Creek at Morgan Hill West Branch Llagas Creek and Tributaries Llagas Creek at Bloomfield A venue Uvas Creek Fisher Creek ,.,;- ... ,. MARCH 31, 1982 FLOODING MAPS .... .:./iII Upper Penitencia Creek (Noble Avenue to Capitol Avenue) Upper Penitencia (Highway 680 to W.P.R.R.) and Coyote Creeks Lower Penitencia Creek Guadalupe River (Highway 280 to W.P .R.R.) Coyote Creek (Highway 101 to Highway 280) Coyote Creek (Vicinity of Alviso) South Babb Creek - ~ ciU -- 86R1993tc iiJWt FLOODING PHOTOC;RA::?HS ..... Uvas Creek at Miller Avenue (1-5-82) Uvas Creek at Christmas Hill Park (1-5-82) Uvas Creek at Thomas Road Bridge (1-5-82) Llagas Creek at Bloomfield Road (1-5-82) Llagas Creek at Gilroy Sewage Treatment Plant (1-5-82) Edmundson and West Little Llagas Creeks at La Crosse Drive in Morgan Hill (1-4-82) Lower Penitencia Creek at Abbott Avenue in Milpitas (3-31-82) Upper Penitencia Creek looking down Lenfest Road from Mabury Road (3-31-82) Guadalupe River at McLellan Avenue between Willow and West Virginia Streets (3-31-82) Coyote Creek near Mobile Park West (4-2-82) Coyote Creek near Alviso (4-2-82) "'" ioii1iiIi Cover Photograph .,... Coyote Creek Flooding at Agnews State Hospital and Mobile Parks West (4-2-82) ,- c;ijiiijJ .... ...... ~ iiiO/il '''''if,; ii 86R1993tc (>Iclfi INTRODUCTION <;t' "il Severe flooding occurred in Santa Clara County as a result of the storms of January 3-5, 1982 and March 31 through April 13, 1982. After the January flooding, the Governor of California issued a State of Emergency Declaration and the President of the United States issued a Declaration of a Major Disaster for Public Assistance; both documents included Santa Clara County. After the March and April flooding the Governor extended the State of Emergency Declaration to include Santa Clara County. The federal declaration, however, was not extended to cover the March and April events. The January storm primarily affected the northwest and southern parts of Santa Clara County. In the northwest, flows in the unimproved portions of San Francisquito Creek caused severe erosion. Flows also escaped from the channel banks at several locations and caused property damage in the City of Palo Alto. In the south, several areas in and around the Cities of Morgan Hill and Gilroy adjacent to Uvas Creek, Llagas Creek and their tributaries experienced flooding. The Santa Clara County Office of Emergency Services reported 136 homes and 14 businesses were flooded as a result of the January event with the total public and private damages estimated at $4.6 million. The March and April storms resulted in flooding in entirely different areas of the County and generally affected the northerly portions of San Jose, including Alviso, and the City of Milpitas. Flows overtopped the banks along the lower reaches of Coyote Creek, Lower Penitencia Creek in Milpitas, Upper Penitencia Creek at several locations, Guadalupe River near Alma A venue and other tributary creeks. The Santa Clara County Office of Emergency Services reported that about 480 homes and 75 businesses were flooded and damage estimates exceeded $10.0 million. In addition, it was reported that about 2,000 people were evacuated from their homes. The summary of damages from the above two storm periods are contained in Table VII. "~ - ... - '. 'M - dOl i"\'!ll, .):M' """ ftiIf ..... - ~.. "1il tH1 1 86R1993 -- in Generally, the statistical flood frequencies for the creeks that flooded in the two storms varied from 7 to 25 years compared to the 100-year criterion commonly used for flood protection design. It is estimated that over $400 million in damages would occur in Santa Clara County as a result of the 100-year flood, or 1 % event. Santa Clara Valley Water District owns and operates eight reservoirs in Santa Clara County having a combined storage capacity of about 155,000 acre-feet. These reservoirs were authorized and built for the purpose of conserving local water resources. The reservoirs have spillways designed to safely carry into the creek channels high flows which would otherwise overtop the dam. During the 1982 storms, these reservoirs substantially reduced the flood peaks. An empty reservoir or one partially full will obviously hold back some of the flood flows from upstream, but even a full reservoir has a flood attenuating function. The water flowing into it cannot move through and out the spillway until it has ponded - - spread out over the surface of the lake - - and thus raised the whole lake level. The result is a delay and a reduction of peak flows downstream of the reservoir. Throughout the report reference is made to "4-year floods" or "10-year floods" or "100-year floods". This is a kind of shorthand description or measure of flood events and does not mean that flooding will occur every 4 or 10 or 100 years but rather that this frequency of occurrence could be expected statistically on the average over a period of many years. The frequency is also often expressed as a percentage. Thus, a 100-year flood is said to be a 1% flood, that is, a flood having a 1% chance of occurring in any year. -;4 .. '" -,--~ --f1fIII i,\'ilOf . iJ$i 'mot j.w,;i '" .w Rainfall and streamflow data for the above storm periods along with historical data for District precipitation and streamflow stations are contained in Tables I, II, III and IV. ..,; ''<\!$ The flooded areas were mapped and are included in this report. A few representative pictures are also included. The Santa Clara Valley Water District has considerable film and video tape documentation on the floods covered by this report. .... 2 86R1993 STORM OF JANUARY 3-5, 1982 ~ A tropical storm centered over portions of Santa Clara County on January 4, 1982 caused high rainfall and subsequent flooding and erosion damage along San Francisquito, Uvas and Llagas Creeks. San Francisquito Creek San Francisquito Creek, which flows through the Cities of Palo Alto and Menlo Park and forms a portion of the boundary between Santa Clara and San Mateo Counties, experienced high flows (about 6,000 cfs in the downstream reaches) and severe erosion damage. The creek overbanked at three locations: near Alpine Road downstream of Highway 280, at University Avenue, and just downstream of Highway 101. The channel in the lower reaches near University Avenue has only the capacity to carry a flow with a 15 to 20-year recurrence frequency. Exten~ive erosion also caused damage to private and public property, undermining roads and destroying fences, retaining walls and private bridges. It was reported that one home on Alpine Road suffered water damage from flows which escaped the creek. Llagas Creek and Tributaries The most severe flood damage occurred in South Santa Clara County in and around the Cities of Morgan Hill and Gilroy. West Little Llagas Creek flooded at Llagas Road, and water was reported to have reached the doorstep of houses and businesses on Llagas Road past Hale A venue. This water also flowed north along Hale A venue. Tennant Creek and Corralitos Creek which have minimal capacities, flooded the streets in east Morgan Hill. The Llagas Creel< Watershed south of Morgan Hill experienced flooding on West Little Llagas, East Little Llagas, Corralitos, Tennant, Edmundson, West Branch Llagas, Lions, Day, Jones and Llagas Creeks. North Morey and Morey Channels and Miller Slough .. ,'"" "'.. -Jial \'iiiiI ,~ - '.. lii.w- "'" 3 86R1993 -M northwest of Gilroy also contributed to the flooding. One of the most severely flooded areas was at the confluence of Edmundson Creek, West Little Llagas Creek and East Little Llagas Creek. Runoff from the west hills flowed through the Morgan Hill city streets instead of flowing in Edmundson Creek. The capacities of East and West Little Llagas Creeks are minimal in this area and the runoff could not be channeled downstream. Water was four feet deep on La Crosse Drive in Morgan Hill which closed the street. In San Martin there was widespread flooding along the West Branch Llagas Creek. Historically, the creek has flooded in the low areas due to the minimal channel capacity. Further flooding occurred with depths exceeding two feet in north Gilroy where Lions Creek and its tributaries ponded water that eventually flowed into Miller Slough near Las Animas Park. Several homes were reported flooded near Wren A venue and water reached the doorstep of others. In addition, th8t'e was widespread flooding in Las Animas Park with two feet of water reported in the park buildings. Miller Slough also overbanked west of the cannery on Forest Street and continued to overbank east of Forest Street. It was reported that ten homes were flooded, one to a depth of about three feet, on Walnut Lane and Forest Street. Damages to seven businesses were reported on the 8500 blocks of Church and Monterey Streets. Flows overtopped the Llagas Creek levee at the Gilroy Sewage Treatment Plant evaporation ponds causing severe erosion to the levee and creating a potential health hazard. Other levees between the evaporation ponds were also damaged as the flood waters continued southerly through the ponds. The proposed Federal Soil Conservation Service project on Llagas Creek and its tributaries will alleviate the West Little Llagas Creek, East Little Llagas Creek, West Branch Llagas Creek, Lions Creek and Miller Slough flooding by collecting and channeling the water downstream. i!;Ii ... ... - ''''~ii ~ ... ~ .,,", "* 4 86R1993 Jii;lf Jones Creek, east of Gilroy, also overbanked, but there were no reports of damage. At the confluence of Llagas Creek and the Pajaro River along the Santa Clara-San Benito County boundary, flood flows covered about 200 acres of primarily agricultural lands to a depth of about two feet. Uvas Creek and Tributaries The Uvas Creek Watershed southwesterly of Gilroy also experienced major flooding and erosion. Downstream of the confluence of Uvas and Little Arthur Creeks, the adjacent flat lands were flooded to a depth of about two feet. The Miller Avenue ford of Uvas Creek at Christmas Hill Park in Gilroy was flooded to a depth of about six feet and the adjacent parking lot and ball fields were also flooded. The integrity of the northerly levees along Uvas Creek between Miller Avenue and Thomas Road in Gilroy were threatened by extensive erosion. Floodwaters undermined about 300 feet of Burchell Road at Highway 152 and caused erosion at the bridge abutments. At the Thomas Road bridge just south of Gilroy overbanking occurred on the northeast side. Two houses were reported flooded to a depth of about five feet near Highway 101. At the confluence of the Pajaro River and Carnadero Creek, flood waters covered about 200 acres of agricultural land in Santa Clara and San Benito Counties up to a depth of about nine feet. Six houses and two businesses were reported to have suffered flood damage from Uvas Creek, Uvas- Carnadero Creek and the Pajaro River. Extensive debris was carried downstream during the storm. Fisher Creek Fisher Creek has a very limited capacity and overbanks in medium to large storms. Water was reported in the garages of many homes between Llagas Road and Palm Avenue, but not inside any living areas. One nursery reported damage from standing water up to two feet deep for two days after the storm. Elderly people had to a - - ~#W 'AW ... w '#IV 5 86R1993 be evacuated from a retirement home which suffered substantial water damage. Erosion .., also caused public and private damage on Fisher Creek. . Ross Creek . There was extensive erosion damage on Ross Creek, but there was no flooding ... reported. Canoas Creek it<IM At Tillamook Avenue in San Jose, Canoas Creek overbanked into the street. w Adobe Creek It was reported that the Shoup Park Citizens Center in Los Altos was flooded with ..... about two inches of water from Adobe Creek. '-. iirJii 'f'WiII' 'W d 6 86R1993 iAlilif STORMS OF MARCH 31 THROUGH APRIL 13, 1982 "'" >41 The March 31, 1982 storm caused high rainfall and extensive damage and flooding to the east and central portions of San Jose, Milpitas and other areas. Flows overtopped the banks of Coyote Creek, Lower Penitencia Creek, Upper Penitencia Creek, Guadalupe River and to a lesser degree Berryessa Creek and South Babb Creek. Guadalupe River On March 31, 1982, Guadalupe River over banked the easterly levee between Alma Street and the Western Pacific Railroad bridge in San Jose. This overbanking mingled with local drainage on the streets and caused widespread flooding of about 15 acres from the Western Pacific Railroad tracks near Dawson Avenue to West Virginia Street and east of the river to the Southern Pacific Railroad tracks and McLellan Avenue. It was reported that there was about one foot of water in the San Jose Elks Lodge on Alma Street. The Willow Street undercrossing of the Southern Pacific Railroad bridge experienced about ten feet of flooding. People were evacuated from their homes on McLellan A venue. This reach of Guadalupe River has a capacity to contain about a five- year flood frequency. Twenty homes and five businesses were reported to be damaged from the floodwaters in this area. There was also local flooding on Trimble Road, Montague Expressway and North First Street. Local parking lots and streets but no buildings were reported flooded. Coyote Creek Coyote Creek flooded a large area during this storm. Two reservoirs, Anderson and Coyote, located on the upstream reaches of Coyote Creek were full and spilling on March 31. As explained in the Introduction, the surcharge storage available above the spillways substantially reduced downstream flood flows below what they would have been if there were no reservoirs on this creek. The most severe flood damage from Coyote Creek was from overtopping and subsequent erosion of the levees on the west bank between State Highway 237 and - Mil ~ ... ;':!!Ii - - - ''Oil ;.M 'iiiiiIiI - "4iif ., - ,alii 7 86R1993 ."" ,;ria ;i' Montague Expressway. As a result, water covered most of the areas between Coyote Creek and Guadalupe River and from Agnews State Hospital north to the Leslie Salt Pond levees, a total flooded area of about 800 acres. This flooding included the ares. north of Highway 237 near the San Jose Sewage Treatment Plant sludge ponds. Highway 237 was closed from April 1 through April 4, between North First Street and Highway 17 due to floodwaters on the highway. Coyote Creek northerly of Highway 237 has the capacity to contain about a one-year flood frequency. Between Highway 237 and Montague Expressway, Coyote Creek has about a 5-year flood capacity. Flooding reached some parts of Mobile Parks West, a mobile home park between Zanker Road and North First Street. Flooding was also reported inside of some of the mobile homes. The water came from Zanker Road and from low areas across Nicholson Lane which leads into Mobile Parks West from North First Street. Up to 1,600 people voluntarily evacuated Mobile Parks West and were assisted in this effort by the San Jose Fire Department and the California National Guard. The flood waters reached Alviso later on April 1, and residents on Pacific Avenue, Michigan Street, Grand Street and the surrounding areas voluntarily evacuated the area. Alviso was flooded easterly of the Southern Pacific Railroad tracks. An estimated total of 262 homes and 60 businesses were flooded in Mobile Parks West and Alviso. Streets and parking lots were also flooded on the east grounds of Agnews State Hospital, at the County Transit District's yard and at the San Jose Sewage Treatment Plant. None of the buildings at these locations were reported flooded. The Santa Clara Valley Water District built two access roads across row crop farm land from Agnews State Hospital in order to reach and repair the eroded creek banks with large equipment and rock. The overbanking was stopped by April 4, 1982. Several large capacity pumps were used by the City of San Jose forces to remove the floodwaters from both Mobile Parks West and Alviso. By April 8, 1982 floodwaters were completely pumped out of Mobile Parks West. "'" .#f w ..... .. "" JiB '41 '.J' ~ "'" ~ ''''t - ,>iff titlIiiIll 8 RflR HHl:l ,'*:if ,iI Coyote Creek also over banked and eroded approximately 200 feet of levee northeasterly of Metcalf Road. It was reported that a private water skiing club which leases this property suffered damages to its recreational facility. Coyote Creek flooded at two other locations in downtown San Jose: near Williams Street where no damages were reported and at 17th Street where one house was reported flooded. This reach of Coyote Creek has the capacity to carry about a 25-year flood frequency but some houses are within the floodWay and, therefore, were subject to flooding at a lower flood frequency. Coyote Creek also over banked on the west side, south of Berryessa Road. It was reported that one business in this area experienced minor flood damage. Up~er Penite~a Creek The Upper Penitencia Creek watershed experienced severe flooding. The reaches that overbanked have the capacity to carry about a five year flood. There was over banking on the south side of Upper Penitencia Creek from upstream of Noble Avenue on Penitencia Creek Road to downstream of Piedmont Road near Cayman Way. Toyon Elementary School was evacuated about 1 p.m. on March 31, 1982. Water reached a maximum of about two feet deep in the streets adjacent to the creek channel. Further flooding occurred on the south side of the creek at Stonecrest Way and Viceroy Way. Water reached a maximum depth of about two feet in these streets. Just upstream of Heatherfield Lane, there was overbanking on the north side of Upper Penitencia Creek. Water, up to about two feet deep, flowed down Penitencia Creek Road to North Capitol Avenue. Downstream of Highway 680, there was overbooking and erosion of the north levee for approximately 40 feet. About two feet of water flowed northerly across North Jackson Avenue toward Commadore Drive and Cape Colony Drive then around Cape Horn Drive to Cape Diamond Drive. One farming area reported some damage. ,. ,;j'/ll '.,4 .~d ;$ ... 9 86R1993 ,~ I~ d " Downstream of North Jackson A venue overbanking occurred in three locations along with erosion of the adjacent levees. Water flowed toward Mabury :R.t>ad and North Jackson Avenue on the east and toward North King Road and Mabury Road on the west. The flow in Upper Penitencia Creek divides just upstream of Mabury Road. The low flow channel goes under Mabury Road and Educational Park Drive and back under Mabury Road near Pine Hollow Circle. The low-flow channel is also referred to as the Overfelt Percolation facility. There is a high-flow diversion northwest of Mabury Road that flows into the low-flow channel downstream of the second Mabury crossing. At three locations on the low-flow channel, there was levee overbanking and erosion of the levee. The west levee overbanked and eroded for approximately 25 feet downstream of the east Mabury Road crossing. Two other overbanking locations were between the east Mabury Road crossing and Educational Park Drive on the east bank for approximately 8 feet and 25 feet. Water was reported up to three feet deep in low spots on Educational Park Drive. It was also reported that floodwaters had entered one house on Pine Hollow Circle. While some water flowed down Pine Hollow Circle, most of the water flowed down Educational Park Drive to Independence High School and then southwest along Pine Hollow Circle. No water was reported to have actually entered the buildings at Independence High School, but the playing fields and parking lots were reported inundated with mud laden flows. One other over banking and erosion of the levee occurred downstream of the confluence of the low-flow and diversion channels for a length of about 40 feet. Water also flowed down Mabury Road, North King Road, Dobbin Drive, Lenfest Road to the railroad spurs, Nicora Avenue and Las Plumas Avenue. Water was up to about three feet deep at the Western Pacific Railroad tracks. It was further reported that one business on Dobbin Drive had four inches of water inside the buildings and five businesses on Lenfest Road had up to two feet of water within their buildings. Debris collected at the box culverts throughout this reach of Upper Penitencia Creek and contributed to the channel overbanking. "~ M >;irI '~oW i-ii <II 10 86R1993 ~ The Berryessa Flea Market reported damage to a number of its businesses. The water ponding at the Flea Market was primarily local storm drainage and not the result of over banking from either Coyote or Upper Penitencia Creeks. Lower Penitencia Creek Lower Penitencia Creek in Milpitas went over its banks in at least four locations. At 741 Penitencia Street on the east bank, water was reported inside the house. At Redwood A venue overbanking reportedly contributed to street flooding from Redwood A venue to Marylinn Street and from the creek to Highway 17. The water also flowed toward the golf course north of Redwood A venue and mingled with other water from overbanking at two locations north of San Andreas Drive. Water was reported at doorsteps and into the garages of houses on the west side of Lower Penitencia Creek. The District's proposed project in this area scheduled to begin in 1982-83 will remedy much of this flooding. There was a storm drain blockage into Wrigley-Ford Creek (the old Berryessa Creek channel) on Berryessa Drive, but water was not reported to have flooded any houses. Berryessa Cr~ Berryessa Creek overflowed its banks approximately 1,000 feet upstream of Calaveras Boulevard, but no damages were reported. South Babb Creek There was overbanking on South Babb Creek at Salmon Creek Court on Squerri Drive and on both sides of the creek at Lochner Drive. Streets and parking lots ponded excess water from Salmon Creek Court to Capitol Avenue. Water travelled down Candler A venue, Mt. Vista Drive and the surrounding streets to White Road, Story Road and Capitol A venue. During the storm, debris and silt collected in this channel that has the capacity to carry a four-year flood. - """lr ... """ ,,",,, .iiili\t' - ..u ~ "" ,'"* .>ia .ijjt """ " 11 86R1993 '" ,,;;I "'Mil' SUMMARY .. '-I!\ The storm of January 3-5, 1982 caused heavy rainfall and subsequent flooding in the northwest and southern portions of Santa Clara County. Gilroy, Morgan Hill and Palo Alto all experienced flooding as a result of that storm, the most severe of which occured in the City of Gilroy. A damage assessment summary for the January flooding prepared by the Santa Clara County Office of Emergency Services is shown on Table V. One person died as a result of a storm related accident. It was reported that 136 homes and 14 businesses suffered flood damage as did several public facilities resulting in an estimate of $4,640,000 in flood related damage to public and private property. Of the $830,000 in damage to Santa Clara Valley Water District facilities as a result of the January storm, $320,000 qualified for 80% cost sharing by the United States Soil Conservation Service. The District also requested assistance from the Federal Emergency Management Agency (FEMA) and the U. S. Army Corps of Engineers. About $10,000 was received from FEMA, but the Corps did not approve any funding. The storm of March 31 through April 13, 1982 caused heavy rainfall in the Santa Cruz Mountains above Lexington Reservoir, in the Guadalupe River watershed and in the eastern foothills above San Jose and in the Hamilton range above Coyote Reservoir all in the Coyote Creek watershed. The heavy rainfall in these watersheds contributed to extensive flooding in Milpitas and San Jose especially in the area between Coyote Creek and Guadalupe River near Highway 237 and in Alviso. Extensive flooding also occurred along Upper Penitencia Creek in San Jose. A Damage Assessment Summary for the April flooding prepared by the Santa Clara County Office of Emergency Services is shown on Table VI. There were no reported deaths as a result of this storm. It was reported that 480 homes and 78 businesses experienced some flood damage. Many public facilities such as highways, bridges and flood control channels also were affected by the high flood flows resulting in an estimate of $10,100,000 in flood related damages to public and private property. 'i!'II, .,. ,"'- l}iiNf .illII - - ,- '" ."" <.<IIt - <,\oil - ,.4 '- 12 86R1993 (liit >II The Federal Emergency Management Agency (FEMA) conducted a survey of the Santa Clara Valley Water District facilities damaged by the April flood flows. Since the County's request to extend the federal declaration of a major disaster was denied, the District does not expect FEMA funds for the April damages. The total damages to public and private property as a result of the 1982 storms are summarized in Table VII. .JM# ... ... - v., :- ~m ~- .- iiiil Siiil ';ill """ ~J 'id 13 86R1993 I ..-4 M" ... 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Clm C") ....:l ~ <: Cl CI.l C) rn 0:: C) ....:l cqO ....:l ....:l rn oorn () ::> a.>'ll - .. .e'O+J ... 'll a.> 0 C") E~Z (j) (j) :;:: ><: II ,...-l cd . co <: oo~ ~ ,,'" ... 0 ,...-l CO C") tn CO o:t' ,...-l 00 C'l o:t' I:- C'l ,...-l c.:l C") ~*< co ooZ ,...-l c.:l c.:l c.:l o:t' tn lJ') lJ') CO CO CO C'l C'l (j) * * Z 00 16 ~* TABLE IV - Historical Peak Flow for M Various Streams in Santa Clara Valley ,"'" Historical Sta. Records Peak Flow - No. Location Began CFS Date 1 Penitencia Creek at Piedmont Road 1939 2,200 04/02/58 .. 16 Alamitos Creek Below Almaden Dam 1939 2,000 12/23/55 23B Guadalupe River at Almaden Expressway 1975 5,047 * 02/19/80 liIIiif .~ 25 Saratoga Creek at Pruneridge A venue 1939 2,298 02/19/80 ... 26A Calabazas Creek at Wilcox School 1976 2,538 01/14/78 ~ 44 Stevens Creek Below Stevens Creek Dam 1930 1,420 12/23/55 .""" 51 Ross Creek at Cherry Avenue 1957 1,550 01/30/68 .. 58 Coyote Creek at Edenvale 1916 10,000 02/10/22 59 Los Gatos Creek at Lark A venue 1970 1,002 * 02/19/80 ,'1fII 64 Berryessa Creek above Calaveras Road 1970 1,002 02/19/80 67 Los Gatos Creek Below Lexington Dam 1930 3,539 04/02/58 .. 69 Llagas Creek Below Chesbro Dam 1950 3,190 04/02/58 '~ - 91 Saratoga Creek at Saratoga- USGS 1.933 2,730 12/22/58 92 Guadalupe River at St. John St. - USGS 1929 9,150 04/02/58 93 San Francisquito Creek at S tanf ord - USGS 1930 5,560 12/22/55 .. Coyote Creek Near Madrone - USGS 1902 25,000 03/07/11 Uvas Creek Near Gilroy - USGS 1959 9,490 02/01/63 "!filii .~ - *Exceeded by 1982 Storm Flows "'" - -. - 17 86R1993 .... .." ," ;>4 TABLE V January 3-5, 1982 DAMAGE ASSESSMENT SUMMARY Date:_~uary 15, 1982 "{Revised) SANTA CLARA COUNTY - TOTAL: $4,640,000 (County, City, Special District, Indian Tribe, Tribal Organization, Private Nonprofit Organization) - Private Section .Qamage Public Sector Damage 3A. Federal Aid System Roads 3B. Elementary and Secondary Schools 3C. Federal Facilities 3D. Public Facilities ,"'"' 1A. 2A. 2C. 2E. 2F. * 2G. * 2H. * 21. "'*' ~ '1lI Number of Dead 1 Homes Damaged136 Businesses Damaged 14 Agriculture - Railroads Private Hospitals Private Schools Private Utilities lB. 2B. 2D. Injured 0 Destroyed 0 Destroyed 0 $2,730,000 515,000 ? Total Private Damage $3,245,000 * Do not include private nonprofit facilities - See Category H under Breakdown of Public Assistance Estimates. ? Total Public Damage $1,395,000 $1,395,000 ... Public Universities and Colleges are included in Category E under Breakdown of Public Assistance Estimates. ;wj. ... ~<< (Rev. 3/78) ,- 86R1993 (Use Numbering System When Reporting, i.e., 2A, 2H, 3B, etc.) SUMMARY PREPARED BY THh SANTA CLARA COUNTY OFFICE OF EMERGENCY SERVICES Exhibit 3e 18 T ABLE VI March 31 - April 13, 1982 DAMAGE ASSESSMENT SUMMAR Y Date: April 20, 19&2 SANTA CLARA COUNTY - TOTAL $10,100~00 (County, City, Special District, Indian Tribe, Tribal Organization, Private Nonprofit Organiza tion) Private Sector Dama~ 1A. 2A. 2C. 2E. 2F. * 2G. * 2H. * 21. Number of Dead 0 Homes Damaged-:r8"O Businesses Damaged 78 Agriculture - Railroads Private Hospitals Private Schools Private Utilities lB. 2B. 2D. Injured 0 Destroyed 0 Destroyed 0 $1,750,000 1,750,000 Total Private Damage 170,000 $3,670,000 * Do not include private nonprofit facilities - see Category H under Breakdown of Public Assistance Estimates. Public Sector ~amage 3A. Federal Aid System Roads 3B. Elementary and Secondary Schools 3C. Federal Facilities 3D. Public Facilities Total Public Damage $6,430,000 $6,430,000 Public universities and colleges are included in Category E under Breakdown of Public Assistance Estimates. SUMMARY PREPARED BY THE SANTA CLARA COUNTY OFFICE OF EMERGENCY SERVICES 'Z!iI' (Rev. 3/78) Exhibit 3e 19 86R1993 :;Wi TABLE VII ',wi 'i;fiiI Summary of Flood Related Damages to Public and Private Property in Santa Clara County January 1 through April 30, 1982 Homes Damaged (616) pi",'''' Businesses Damaged (92) Private Utilities Public Facilities Total estimated cost of damage to public and private property - #lfliil .... ,will 'Wi1 .. ,.,. .. ,~ - "". - *" 86R1993 20 >8' Estimated Cost $ 4,480,000 2,265,000 170,000 7,825%000 $14,740,000 ;,iJfJ/ ...tI ,ijj January 4, 1982 Flooding Maps ~. "'" .i<lf .Wtif w "".;;;Ii , . 1/ ~-/ " , ? /1 / " , /:~,\/ -<>~:/(;/( /.\V;I II i' ~y/ I.; II ,,"' ',~ . <,.. ,,< S" i;>'>'C;. ~. '\~0 +t." ,."'~~ ~c. . .;,..../.. />>/ ,,;~:> .,.- ./,</ ~ " ~ .../ Z W - C W 0 a: 0 0 ...J 0 U. .... (\I - co ::) 0) 0 ?'" fJj 0 ~ z > < a: a: < u. :J Z :v: , .;--~~'--~t"""""; """ " ~". c:J ! a o ,Ly' ~ \\? II. II \:, ,,,.\\:S _'K"ic"F~r -/ I )i II ~ .. i " ,. /./ " .'..... .: .~.. ~il.' . . . , ~l / .'. J 1 I :1/.:/ i /1.. ,',- ,..,-:-:: / :' l t / .,:I..i.;,.. iL-/LiL- r ,.. \ \ -:,.\ \ .''\ "'...... // ".t"" ~" \. ~~ ~/ , /' I . / ,. ~ ~, j - {DCCA CT ~OCCA OR . .. I ,'" ~ 1:Jo..r!! ,. t,.,,~ ~ J 'I ~ , \ \ ~ , -, ... ... ,. " ,- ~ ) JANUARY 4, 1982 FLOODING TENNANT CREEK CORRALLITOS CREEK (CONTINUOUS OVERBANKINO) '.l. ~ ... ~ .- I I -~y--~ I \/ \. \\.' ~-----r\-_U-- ~ -" \ .~, I ( ~# 7 '.~., " .' - .. . .. > Il,iil - \ ..... ,'III ,ill co M1l!I .... <=> ..... ~. doll t. en ..,. .. .. .- co ..,. .... - ',"" " , ,/ .- .- .... ..,. .. .- ..,. ..,. .- ... ... on ..,. .- .'('~ - .... ..,. "~ - ... .., .- ..,. ... .- '.. ..... ..,. ,- '. .. <G '!"lI!IM .. ~ '-\ - ..... <=> .... en ..,. - ..,. .... ..,. <<> ..,. .., ..,. 0: ~ - .. o '0 .0 ~ :: .. j8~.~iiiJ'~~ JANUARY 4, 1982 FLOODING WEST LITTLE LLAGAS CREEK EAST LITTLE LLAGAS CREEK EDMUNDSON CREEK (CONTINUOUS OVERBANKING) ~~; on .... ... JANUARY 4, 1982 FLOODING LLAGAS CREEK (CONTINUOUS OVERBANKINO) ii4tii __H u ~ u ., )-::)- ( / 1,"" ~\ ,~ \ I "''' .\ \ ,~ \ :" \ I ,( ,,', .-. ..L -+ ~ <, _..:;~~ f:~~;-2:'; ~'lt': .-.--,-:--- i---:JY::~-'-, [' . I ..~, _ ----I! ~t<ll'.'-. .: --~ - ~, . ! I I ',I 'o...:'--J ;'~-j}1_ If ~> ';- " .. ~........ --_\~.pl~~~~-----*---"""\- ---- . ::a:: "-- ", "'-..... " =::t Q \". \" " " .........',' ,//" ........ ....,.,........ "?'"-~ ....." ~~......:~ ? . < CJ', ., o....~ 0....0 ~.....u "j:. '. ...... "t--- l ;/ I ~' : 1-'~-; : ~,j---L- -~' :~.+----- -' '~ ./ ~/' <~/ ............ ~ ../ (/~ " _ .L____ \ , , I I .<- , , I -J \ .......... ... JllF'!!fJr].~;~f:' ~J.:~". 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Co) ~ UJ < > > a: :J < :J Z < .., " "--- ~ ~ ---- U) \/ '( \ ----/' \ \- ...\., .... g\ //.; , I / I :.---, I f .,~ ~ ~d W N W / co a: ~ 0) 0 i .... a: - w ~ :I: ~ > en 11<' a: u.. < ~ // Z < ., "" .// " " ~/ ~ ,/ /' / ',/ / / / / ,// / / // ", " /' / ./ f /...;" / "'. / // <t / / //' / / ./ /"",. .",.i;:/. ..... / //,^i~,,~ / ,,.,;rJ'~// W1.. ~1 l~ /. ,~J .~ ,~ '41~_ /' ///' / / / // j/ , " .. ,/ ' ',,- ",4 v.fAiW "" ~- ;-W .. ~.... March 31 J 1982 Flooding Maps ;;,;lii ;"j;\j ... '. -. ;f!IliiII ~fi I ... ,411 I '" ':'liiJ!i__ - .... ---- ;- .. . - - - ! .... ~~jt QLi _.~ .' ! I .' 'iIfIlII~.O '.,.... :' -.c ... ""'-~::J . '" . , '.,:.' .. -. o. .~.. I ''t . ~-- , ------ """t---. - . <'. I'" r. .. I- .~ ~ : :: l ~ - , =r---'/ f I r--= I . I . ( .4,- ic o. ~ MARCH 31,1982 FLOODING ~~ rDI? UPPER PENITENCIA CREEK !li'V! r? COYOTE CREEK J i 1 ! ! . j I r . '. . :1~.f'Ilf ro" oJ:!' Ii!: .'. ..... '''~.' 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