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Calleguas Creek Watershed Hydrology Study Present Condition

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Calleguas Creek Watershed Hydrology Study Present Condition CALLEGUAS CREEK WATERSHED HYDROLOGY STUDY PRESENT CONDITION Moorpark Simi Valley Camarillo Thousand Oaks Ventura County Public Works Agency Watershed Protection District March 2003 CALLEGUAS CREEK WATERSHED HYDROLOGY STUDY PRESENT CONDITION Ventura County Public Works Agency Watershed Protection District March 2003 ACKNOWLEDGEMENTS This report represents the combined effort of a large number of agencies and individuals whose contributions are hereby gratefully acknowledged. Supervisor Judy Mikels Calleguas Municipal Water District US Army Corps Of Engineers, Los Angeles District City of Camarillo City of Moorpark City of Simi Valley City of Thousand Oaks Calleguas Creek Watershed Management Plan Participants The following members of the Ventura County Watershed Protection District staff have been instrumental in the creation of this hydrologic report: Scott Holder, Robin Jester, Hassan Kasraie, David Laak, Jayme Laber, Olga Ready, Louise Shi, Dolores Taylor, John Trone, Denny Tuan, Sergio Vargas CALLEGUAS CREEK HYDROLOGY REPORT TABLE OF CONTENTS I. INTRODUCTION/HISTORY A. Introduction 6 B. Historical Models 6 1. Modified Rational Hydrology Method Adoption 6 2. Figure 1 – Vicinity Map 7 3. NWS-Sacremento Model in Real-Time 8 4. COE HEC-1 Model Update 8 5. HSPF Calibration Model 9 II. METHODS AND TECHNIQUES A Modified Rational Hydrology Model-VCRAT Computer Model 10 C. Model Applications 11 D. Areal Reduction 11 E. User friendly tables 11 F. Figure 6 – AR Curve for Calleguas Mainstem above Conejo Creek 12 G. Figure 7 – AR Curve for Calleguas Mainstem below Conejo Creek 13 H. Figure 8 - AR Curve for Conejo Creek 14 I. Figure 9 - AR Curve for Revolon Slough 15 J. GIS and Calleguas Creek Hydrology Model 16 III. DESCRIPTION OF STUDY AREA A. Location 17 1. Simi Valley 17 2. Moorpark 17 3. Camarillo 18 4. Thousand Oaks 18 5. Santa Rosa Valley 19 B. Soils Classification 20 C. Land Use 20 D. Climatology 21 E. Runoff Characteristics 21 F. Table 2 – 36 Year Mean Annual Precipitation 22 IV. Study Results 23 A. Calculated and Estimated Peak Flows 23 FINAL CALLEGUAS CREEK HYDROLOGY REPORT SECTION I INTRODUCTION/HISTORY Calleguas Creek drains an area of approximately 343 square miles, predominantly in southern Ventura County and outlets into the Pacific Ocean at Mugu Lagoon. The watershed includes Arroyo Conejo, Conejo Creek, Arroyo Santa Rosa, Arroyo Simi, Arroyo Las Posas, and Calleguas Creek, as well as Revolon Slough and Mugu Lagoon. The Santa Susana Mountains, South Mountain, and Oak Ridge Mountains form the northern boundary of the watershed. The Simi Hills and Santa Monica Mountains distinguish the southern boundary (See Fig. 1). HISTORICAL MODELS The Calleguas Creek Watershed has been modeled several times since the early 1960’s. The first study by Boyle Engineering used the older Soil Conservation Service (SCS) method which was limited by the allowable rainfall intensities. Typically, the maximum intensity was about 2-inches per hour. Recording raingage records for Ventura County indicated much higher values, which were as high as 5-inches per hour for short duration times. Because valuable background information on each sub-watershed had been calculated which included weighted CN value, 12-hours design precipitation, and aerial reduced rainfall, the report was used by Ventura County Flood Control District (DISTRICT) staff for rural watersheds until 1985. MODIFIED RATIONAL HYDROLOGY METHOD ADOPTION Beginning in 1970, when a comparison of DISTRICT flowrates with Los Angeles Public Works (LAPW) design flows indicated much lower values at the border between us, the DISTRICT adopted the Modified Rational Method for all Design Hydrology. Hydrologists from LAPW trained DISTRICT hydrologists in the computer model developed by them. Using the newest Soil Survey Report completed by the SCS for Ventura County in 1970, the soils of Ventura County were carefully divided into seven hydrologic soils with loss rates varying from one-quarter of an inch per hour to over two inches per hour in beach sand. Staff, working closely with consultants such as Koebig and Koebig and Toups Corporation (now called Hawks and Associates) jointly developed Master Drainage Plans. Included for the City of Thousand Oaks were all major and minor tributaries to Arroyo Conejo from the headwaters in Lang Ranch to the final junction of North Fork Arroyo Conejo at Hill Canyon where the channel changes name to Conejo Creek prior to junction with Arroyo Santa Rosa. In Simi Valley the entire watershed was modeled from the headwaters by Rocky Peak to Alamos Canyon junction on the Arroyo Simi downstream of Madera Road. For City of C U Y A E M A ST A F R O N RK IV O A R M S E T EY R H A R M O F G UR O O C S R S R A T N K E A O LO C U E Y C R F K N K E E A W E R K C O C O R Y D E E C R CRE K R EEKOD E D O K W C K LO L A A M OS B C E A N A Y R O T N R A P C R E E K . o C a r a L o b r s a A B n g a t e n le a M A s TILIJA C S R E C EK o . O jj a ii EEK R C E N L NYO HOLSER CA B O O P U Calleguas Creek L K D E E O E R R L B C E E C Watershed Boundary A R F i l l m o r e A E F i l l m o r e P R E R S B Y E E A C K S C R S R E O E E L E K O F K A A CO E R D G Y D RIV O LA RA I A T A C T C E N E M A L H T C C N L S N O R S A T A S Y E B R N V E W N A E K A NY ON I Y S a n t a P a u l a MP C A P C N O R S a n t a P a u l a CA O Y T N A L N YO R R PP U C A EL T N A L R MANU A S I H H C N A N A N M Y O F B D N W C Y IN A A W A O C N N R O Y O N O R N A N I V Y A O A C M Y H A CAN C N C C N N I S S L A C N A O A C L J C A A R M L I A A G R A L L R R H L L A F R L A K O S A N A A B A R S B A X H B A R B M o o r p a r k E A M o o r p a r k O R W Y M W B N R L R A A O E A T O S A R N R IM R IE L H N I S i m i V a l l e y I R R S i m i V a l l e y C R N U S a n B u e n a v e n tt u r aR A A A A N G C H A M N C E A B Y A E C N L R Y A S A O S D D O N R K A R R A T A E E N E A I B S N R HILLS DRA IN C cifi LO O T h o u s a n d O a k s Pa c O RAIN A MA RI L J c IS D C E RK A RR OY O CO e DOR N FO N E REEK a O RTH JO C n O x n a r d C a m a r ii ll ll oC NO NG N I A A L A N R I R R A D O R S N YO I K D E CONE E JO A A D D R S C R A S D O P A O T R U S E E A G L E E IC L R R L T MU A S G C J P o r tt H u e n e m eU D R A IN P A C I F I C C O A ST HW Calleguas Creek Figure 1 Vicinity Map VCFCD Redline Channels Major Roads Cities 0 3.5 7 Miles Calleguas Creek Watershed Boundary FINAL Camarillo, their entire Sphere of Influence was included. All of these Master Drainage Plans include maps of existing facilities at the time of the study as well as proposed improvements to the drainage system for each area. DISTRICT engineers and hydrologists modeled many other areas within the Calleguas Watershed. NWS-SACRAMENTO MODEL IN REAL-TIME As a result of damages to Point Mugu Naval Air Station, caused by the Calleguas Creek Levee failure in February 1980, the Navy signed an agreement with the DISTRICT and the National Weather Service (NWS) to provide flood-warning to the base from both Calleguas Creek and Revolon Slough.
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