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HomeMy WebLinkAboutSUP 15-02; AGUA HEDIONDA CREEK RESTORATION; HYDRAULIC ANALYSIS; 2015-11-02HY~DRAULIC ANALYSIS FOR THE AGUA IIEDIONDA STREAMBANK RES.TORATION-COMAN November 2, 2015 Civil Engineering o Hydrology o Hydraulics o Sedimentation P.O. Box 9496 Rancho Santa Fe, CA 92067 (858) 692-07 60 FOR REVIEW ONLY TABLE OF CONTENTS Introduction ........................................................................................................................................ ! Hydraulic Analysis ............................................................................................................................. 1 Conclusion ......................................................................................................................................... 2 Restoration Exhibit ............................................................................................................................ 3 APPENDICES A. HEC-RAS Analysis FOR REVIEW ONLY INTRODUCTION The lower reach of Agua Hedionda Creek is located within the city of Carlsbad. The creek is a natural watercourse where it enters the eastern city limits and remains natural until it reaches the Rancho Carlsbad Mobile Home Park just upstream of Agua Hedionda Lagoon. During flow events, natural watercourses can experience physical changes associated with scour (erosion) or deposition. The southerly bank of Agua Hedionda Creek has recently undergone erosion along the Coman residence at 5855 Sunny Creek Road (see Figure 1 ), which is approximately 4,500 feet upstream of the Rancho Carlsbad Mobile Home Park. This location is along a bend in the creek, so is subject to additional forces due to the channel curvature. The City is proposing to restore the eroded streambank using a bioengineered solution. This report contains hydraulic analyses of the project area, which are used to assist in the bioengineering design. Figure 1. Erosion Along South Bank of Agua Hedionda Creek HYDRAULIC ANALYSIS An existing condition hydraulic analysis has been performed to determine the flow velocities and shear forces along the project site. The analysis was performed using the US Army Corps of Engineers' HEC-RAS model. The HEC-RAS input parameters are as fo llows. HEC-RAS models the physical channel shape with cross-sections spaced along the study reach. The cross-sections are shown on the HEC-RAS Work Map in Appendix A. The cross-sections were created using l-foot contour interval topographic mapping from the City along the study reach. This mapping was supplemented with 2-foot contour interval mapping from the City's GIS coverage, where needed. The roughness coefficients of the channel bed and banks were assigned a value of 0.050 to reflect a moderately vegetated channel, which is generally representative of the overall study reach. The 10-, 50-, and 1 00-year flow rates are included in the model. FEMA only provides the 100- year flow rate near the sit,e, which is 7,810 cubic feet per second. In addition, they provide the 10-and 50-year flow rates at a downstream location in Agua Hedionda Creek, i.e., at the confluence with Buena Creek within the Rancho Carlsbad Mobile Home Park. The 10-and 50- year flow rates at the site were estimated by adjusting the downstream flow rates by the ratio of 100-year flows (see the FEMA peak discharges in Appendix A). The 10-, 50-, and 100-year existing condition HEC-RAS results for the study reach are included in Appendix A. The eroded channel bank is between cross-sections 5 and 7. The results show that the flow velocity between these cross-sections can reach over 7 feet per second, which is considered an erosive flow velocity. The HEC-RAS results along with the channel curvature verify that the natural stream hydraulics have contributed to the bank erosion. CONCLUSION The hydraulic analysis has verified that the eroded slope is naturally subject to velocities (and shear forces) that can cause lateral erosion. The fact that the eroded slope is along a bend in the creek channel indicates that the slope is subject to an increased potential for erosion. The City of Carlsbad proposes to restore the Agua Hedionda Creek streambank using a bioengineered solution developed by Balance Hydrologies, Inc. and Dudek. The solution consists of crib walls along the eroded slope consisting of natural materials such as logs, backfill, boulders, and revegetation (see the exhilbit contained after this report text). Balance Hydrologies and Dudek have designed the crib walls to withstand the flow velocities and shear forces determined in this report to a level acceptable to the City. 2 APPENDIX A HEC-RAS ANALYSIS FEMA FLOW RATES TABLE 8: SUMMARY OF PEAK DISCHARGES Peak Discharges (cubic feet per second) Flooding Source and Location Drainage Area 10°/o Annual-2% Annual-1% Annual-0.2°/o Annual- (sq. miles) Chance Chance Chance Chance Adobe Creek 2,200 Feet Upstream of Peet Lane 0.67 375 485 560 7 10 Agua Hedionda Creek At Confluence with Buena Creek 6.3 1,600 4,800 7,000 15,500 2,200 Feet Upstream of Rancho Carlsbad Drive 16.5 1,,Z85 5,~_?5 7,810 Upstream of Cal avera Creek 17.3 8,080 At El Camino Real 23.8 9,850 Alvarado Creek At Lake Shore Drive 4.6 1,200 2,000 2,300 3,000 At Interstate 8, Near Trailer Park 5.3 1,300 2,200 2,500 3,200 At Interstate 8, Near Murray Boulevard 5.7 1,400 2,400 2,700 3,500 Upstream of Murray Creek 6.3 1,600 2,600 3,000 3,800 Downstream of Murray Creek 10 .1 1,700 2,900 3,300 4,200 At Downstream Side of College A venue 11 .4 2,100 3,400 3,900 5,000 Upstream ofTributary Channel 12 .1 2,300 3,700 4,300 5,400 Downstream ofTributary Channel 13.4 2,600 4,300 4,800 6,100 Interpolated 10-and 50-year flow rates at site in red. --Data Not Available 68 HEC RAS Plan EC FEMA R1ver: RNER 1 Reach· Reach 1 Reach RIVef Sta J Profile a Total t. Min Ch El I w.s. Elev 1 CritW.S. + E~. Elev E G. Slope Vel Chnl Flow Area J Top Weith I Froude I Chi Reach-~ 1 p~> ~(ft) rT (ttl _w_ ~ (ftllt) (Ills) (sqft) (ft) - ;Approx. 10-Y-178500 8027 8768 864 ssn 00114 8.35 214 46.74] 069 R .. ch-1 1 Approx 50-v ... 535500 8027 9071 906 92.29 00114 11.21 620 18407 0.74 --781oooT 91.7T 215.18] R .. c:h-1 1 100-Yoar 80.27 9185 93.63 0.0114 12.37 847 0.76 Reach-1 2 :Approx 10-Y-178500~ 7800 8808 ( 8934 0.0095 911 207 sos8l 061 Reach-1-2 Approx 50-Y .. r 535500 7800 9153 91.5l 9329 0.0118 1229 594 17930 og Reach-1 2 100-Yoar 781000 7800. 9313J 9311 9461 0.0098 12.27 1004 309.37 067 . ~~ n~~ --Approx 10-Y .. r -Reach-1 3 8914 847 8967 0.0032 599 325 6781 037 Reach-1 3 Approx 50-Y-5355 cit:--n 60 9238 909 9376 00066 1037 :r 15224 055 . 9291 Reach-1 3 --100-Yoar _ 781ooo n60T 9323 9525 0.0093 1292 181.90 066 Reach-1 4 Approx 10-Y .. r 1785001 7980 8909 920 1 9005 00081 832 24~j 5482 0.58 -Reach-1 4 _Approx 50-Y-535500 7980 9245 9436 00118 1260 540 11714 074 Reach-1 4 100-Yoar 7810 00 7980 9343 934f 9615 00153 1533 665 137.23 085 Reach-1 5 fApprox. 10-Y .. r 178500 7950 8993 I 90.33 0.0026 -525 365 8801 034 Reach-1 5 Approx 50-Y-5355~L 7950 9392 9478 00037 825 806j 13606 043 . ---+-Reach-1 5 100-Yoar f-7810001 7950 9545 96701 00049 1033 11211 27549 051 Reach-1 8 Approx. 10-Y-1785~1 8100 8991 90.4ril 0.0040 6.29 33~1 65.46 0.43 . ---~each-1 8 Approx 50-Y-535500 81.00 9395 9490 00046 917 ns 137 72 049 R..a.-1 8 100-Year f-781000 8100 9551 9665 00058 1136 1105 28412 057 I . -Reach-1 7 Approx. 10-Y .. r 1785~F 8100 89.n --t 90.81 0.0095 6.90 240 78.41 0.63 . Reach-1 7 Approx 50-Y-5355.00 8100 93.92 9515 00069 10.69 700 156.48 0.58 Reach-1 7 100-Year 7810 OQ.!_ 8100 9582 -9704 00065 1156 1174 336n 058 -. Approx 10-Y-81.501 --1--91.241 685T R..a.-1 8 178500 90.23 0.0074 252 64.58 056 Reach-1 8 . Approx. 50-Y .. r 535500 81.~1 94 24 --955~j 00071 11 .~1 704 157.03 0.59 -Reach-1 a 100-Ye.-781000 81 50 9607 9741 00069 1245 1035 23263 060 Reach-1 8 . iApprox 10-Y-178500 SJn 90.88 91.62 00069 7 47 2n 74 40 056 -535500 1---Reach-1 9 Approx. 50-v ... SJ.n 94.64 95.87 00066 10.36 676 139.14 0.60 Reach-1 8 100-Y--781000 SJn 9607 948 9799 0.0094 1355 917 25605 073 . Reach-1 10 Approx 10-Y--178500 1-SJn 91.33 9192 0.0046 657 327 9927 047 Reach-1 10 Approx so.v ... 535500 83.~, 9537 96.17 0.0038 8~1 830 141.~! 046 -RMc:h-~ ~ 100-Year -761000 SJ.n 97.44 -9836 00038 9 42 1205 235.15 048 - 90 85 g 95 g ~ ., w 90 85 soL r 0 100 Agua Hedionda Creek at Coman Residence RS = 10 05 )o( 05 + Stabon (ft) Agua Hedionda Creek at Coman Residence RS = 9 1 --.-200 300 Station(ft) Plan: EC FEMA Flows 05 ---'l Plan: EC FEMA Flows OS ->j 400 Legend WS 1QO.Year I ws Approx 50-Year WS Approx. 10-Year Ground 500 • Bank Sta Legend WS1QO.Year WS Approx. 50-Year WS Approx. 10-Year Ground • BankSta Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS=8 05 >,c.05J. .05 --~ 105 Legend WS 100-Year 100 WS Approx. 5(}. Year WS Approx. 10-Year g 95 Ground ~ • BankSta .. > .!! w 90 85 80 0 100 200 300 400 500 StatJon (ft) Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS =7 105f .05 )o( 05 )o( -05 ----~ Legend WS 100-Year 100 WS Approx. 50-Year WS Approx. 1(}.Year g 95 Ground ~ • Bank Sta !l! " 90 w 85 80 T~~ ~T-T ...,------.. ~ 0 100 200 300 400 500 StatJon(tt) Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS =6 ""' 05""' 05 ~ 105 Legend WS 100-Year 100 WS Approx 50-Year WSApprox 10-Year g 95 Ground ~ • Bank Sta ~ .!! 90 w ] ' ' ' ' 0 100 300 400 500 Station (It) Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS= 5 05 -+ 05 + .05 --~---~ 100 Legend WS 100-Year 95 WS Approx. 50-Year l ws"""' '"'"' g 90 Ground ~ • Bank Sta ~ "' iii 85 80! 75 T r 0 100 200 300 400 500 Station (ft) 05 + 05 100 95 g 90 c: 0 . ., !l! .. 85 w 80 75 r~o 0 Agua Hedionda Creek at Coman Residence RS =4 ,.. 05 + 05 ' ' ' 100 200 300 Station (It) Agua Hedionda Creek at Coman Residence R$=3 ,.. .05 ~~ ~ ---, 100 200 300 Station(ft) Plan: EC FEMA Flows ' 400 Plan: EC FEMA Flows ~ --r--.,--r----r 400 ' Legend WS 100-Year I WS Approx 50-Year WS Approx 10-Year Ground • BankSta 500 Legend WS 100-Year WS Approx. 50-Year WS Approx 10-Year Ground \neff • Bank Sta ._....--~--.-----, 500 Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS:2 .05 ... 05 + 05 _, 100 Legend I WS 100-Year WS Approx. 50-Year WS Approx 10-Year g 90 l Ground ~ • BankSta ~ .!! 85 w 80 75 0 100 200 300 400 Station (It) Agua Hedionda Creek at Coman Residence Plan: EC FEMA Flows RS= 1 05 + 05 ... .05 , 100 I 95 WS Approx 50-Year WS Approx 10-Year g Ground ~ • 90 BankSta ~ .!! w 85 801 ,~ ' 0 150 200 250 300 StatJon(ft) I N METAL SHED Balance ~:~ta Hydrologies, Inc. 215127 Coman Grading.dwg ~ ?" .30" ~E • W< PLAN 1 II= 1 0' 100 95 RESTORE BANI:: WllH ENGINEERED AU BEHIND BIOENGINEERED CRIBWALL 100 95 75 ~--------------------~--------------------~--------------------~ 75 0+00 0+10 0+20 0+30 10' 20' SCALE: 1" = 10' SECTION 1" = 5' REVEGETATION LEGEND • t· ....... •j ....... ......... .. . . . . . . . . . . . . . . CUTIINGS CONTAINER PLANTS & SEEDING NOTE: REFER TO REVEGETATION PLANT LIST, SEED MIX, AND NOTES ON SHEET 2 Bank and Channel Stabilization, Agua Hedionda Creek, Coman property, City of Carlsbad, California DUDEK PRELIMINARY CONCEPT ONLY -NOT FOR CONSTRUCTION THESE PLANS ARE PREPARED TO COMMUNICATE PRELIMINARY CONCEPTS FOR BIOTECHNICAL TREATMENTS FOR EROSION CONTROL SHEET 1 October 7, 2015 C2015 Balance Hydrologies, Inc. N METAL SHED Balance Hydrologies, Inc. 215127 Coman Grading.dwg , PLAN 1" = 1 0' 105 ,.--------1 3' DIAMEfER FOUNDATION BOULDER RESTORE BANK WITH ENGINEERED F1ll BEHIND BIOENGINEERED CRIB WALL 95 75 L-----------~------------L----------~ 75 0+00 0+10 0+20 0+30 UMIT OF REVEGETATION. TYP ---0' 5' 10' 20' ....... ~.,... SCALE: 1" = 10' SECTION 1" = 5' REVEGETATION LEGEND • ~· ...... 'i ....... ........ . . . . . . . . . . . . . . . '., CUTTINGS CONTAINER PLANTS & SEEDING NOTE: REFER TO REVEGETATION PLANT LIST, SEED MIX, AND NOTES ON SHEET 2 Bank and Channel Stabilization, Ague Hedionda Creek, Coman property, City of Carlsbad, California DUDEK PRELIMINARY CONCEPT ONLY -NOT FOR CONSTRUCTION THESE PLANS ARE PREPARED TO COMMUNICATE PRELIMINARY CONCEPTS FOR BIOTECHNICAL TREATMENTS FOR EROSION CONTROL. SHEET 1 October 7, 2015 Cl20 15 Balance Hydrologies. Inc. ., ~ PLANT LIST ON-CENTER COMPOSITION 1 BOTANICAL NAME COMMON NAME SIZE SPACING (APPROXIMATE) CANOPY SPECIES BACCHARIS SALICIFOLIA MULEFAT 1 GALLON 5' 5% HETEROMELES TOY ON 1 GALLON 5' 10% ARBUTIFOL/A PLATANUS RACEMOSA WESTERN SYCAMORE TREEPOT4 10' 10% QUERCUS AGRIFOLIA COAST LIVE OAK TREEPOT4 15' 20% SALIX EXIGUA NARROW-LEAVED WILLOW CUTTINGS 2'-6" 10% SALIX GOODD/NG/1 BLACK WILLOW CUTTINGS 2'-6" 5% SALIX LASIOLEPIS ARROYO WILLOW CUTTINGS 2'-6" 40% TOTAL 100% UNDERSTORY SPECIES I ANEMOPS/S CAL/FORNICA YERBA MANSA 1 GALLON 2' 10% CAREX SPISSA SAN DIEGO SEDGE 1 GALLON 3' 10% IVA HAYES/ANA SAN DIEGO MARSH ELDER 1 GALLON 3' 10% JUNCUS ACUTUS SPP. SPINY RUSH 1 GALLON 3' 5% LEOPOLD/I JUNCUS MEXICANUS MEXICAN RUSH 1 GALLON 2' 5% EL YMUS TRITICOIDES CREEPING WILDRYE 1 GALLON 2' 10% MUHLENBERG/A RIGENS DEER GRASS 1 GALLON 2' 10% ROSA CALIFORNICA CALIFORNIA WILD ROSE 1 GALLON 3' 20% RUBUS URSINUS CALIFORNIA BLACKBERRY 1 GALLON 3' 20% TOTAL 100% NOTE: ALL PLANT MATERIAL SOURCES NEED TO HAVE COME FROM COASTAL SAN DIEGO COUNTY. SEED MIX BOTANICAL NAME COMMON NAME ; PURE LIVE SEED RATE tiACRE AMBROSIA PSILOSTACHYA WESTERN RAGWEED 6 2.0 ARTEMISIA DOUGLAS/ANA DOUGLAS MUGWORT 10 2.0 ARTEMISIA PALMERI SAN DIEGO SAGEWORT 10 1.0 DISTICHLIS SPICATA COASTAL SALT GRASS 70 2.0 LEYMUS TR/T/C/0/DES WILD RYE 80 4 .0 JUNCUS BUFONIUS TOAD RUSH 60 3.0 MUHLENBERG/A RIGENS DEER G RASS 60 1.0 TOTAL 15.0 NOTES: SEED MIX SHALL BE HAND BROADCAST, RAKED INTO THE SOIL, AND COVERED WITH A FINE MULCH SEED TOPPER. ALL SEED SOURCES NEED TO HAVE COME FROM COASTAL SAN DIEGO COUNTY. REVEGETATION AND PLANT ESTABLISHMtNT NOTES 1. THE REVEGETATION INTENT IS TO PROVIDE PERSISTENT COASTAL SAN DIEGO COUNTY NATIVE PLANTS THAT WILL SUPPORT CREEK BANK STABILIZATION AND SEDIMENT CONTROL. W'TH AN ANCILLARY HABITAT BENEFIT. IN ADDITION. THE INTENT FOR THIS PROJECT IS TO HAVE HEALTHY AND VIGOROUS. PERSISTENT PLANTS AND SEEDED AREAS AT THE END 0> THE PLANT ESTABLISHMENT PERIOD THAT CAN SURVIVE WITHOUT IRRIGATION OR OTHER MAINTENANCE ACTIONS. WHEREVER POSSIBLE. THESE PLANTINGS AND SEEDED At<EAS SHOULD CONSIST OF THE ORIGINAL MATERIALS INSTALLED. 2. SnE PREPARATION FOR REVEGETATION WILL INCLUDE SOIL REHABILITATION AND FINE GRADING. 3. R£VEGETATION WILL INCLUDE BROADCAST SEEDING WITH A NATIVE SEED MIX. AND INSTALLATION OF NATIVE CUTTINGS AND CONTAINER PLANTS: REFER TO THE SEED MIX AND PLANT LIST SHOWN ON THE PLANS. 4. THE REVEGETATION WORK WILL BE CONDUCTED CONCURRENT WITH THE ENGINEERING CONSTRUCTION FOR SEAMLESS INSTALLATION OF THE BIOTECHNICAL TREATMENTS SHOWN ON THE PLANS AND CROSS-SECTION. 5. SEEDING WILL BE CONDUCTED BYWAY OF BROADCAST SEEDING. SEEDING WILL BE CONDUCTED BEFORE ENCLOSING THE FABRIC ENCAPSULATED SOIL (I.E .• SEED MUST BE IN CONTACT WITH THE SOIL. WITH SEEDING OCCURRING UNDER THE FABRIC). SEEDING IS EXPECTED TO BE CONDUCTED FROM SEPTEMBER 15 THROUGH OCTOBER 15, AND AFTER Gf!ADING ACTIVITIES. CONTAINER PLANT INSTALLATION IS EXPECTED TO BE CONDUCTED AFTER SEEDING OPERATIONS AND BETWEEN OCTOBER 15 AND NOVEMBER 15. BEFORE ANY RAIN. CUTTING INSTALLATION IS EXPECTED TO BE CONDUCTED AFTER NOVEMBER 15 AND BEFORE DECEMBER 15. ALL CONTAINER PLANTS AND CUTTINGS WILL BE W.\TERED IMMEDIATELY AFTER INSTALLATION. 6. TH~ REVEGETATION WORK WILL BE SUPPORTED BY IRRIGATION AND WATERING APPLICATIONS TO ESTABLISH HEALTHY AND VIGOROUS PLANTS THAT ARE NOT IRJ.'IGATION-DEPENDENT AT THE END OF THE PLANT ESTABLISHMENT PERIOD. WATER WILL BE APPLIED IN A WAY TO ALLOW FOR THE 'WEANING OFF' OF PLANTS. 7. IRF·IGATION WILL BE CONDUCTED USING A TEMPORARY MANUALLY-OPERATED OVERHEAD SPRAY SPRINKLER SYSTEM. B. THE EXISTING CREEK WILL BE USED TO SUPPLY THE WATER FOR THE IRRIGATION SYSTEM. A MOBILE 2NGINE-DRIVEN PUMP WILL BE USED DRAW WATER FROM THE CREEK TO PR::>VIDE THE REQUIRED WATER PRESSURE AND FLOW TO ENERGIZE THE IRRIGATION SYSTEM. 9. TH: IRRIGATION SYSTEM WILL BE INSTALLED IN SEPTEMBER. WITH A FULLY-OPERATIONAL SYSTEM IN i'LACE BY SEPTEMBER 30. THE IRRIGATION SEASON IS EXPECTED TO BE MARCH 15 THROUGH DECEMBER 15 ANNUALLY. 10. TH: PLANT ESTABLISHMENT PERIOD WILL BEGIN IMMEDIATELY AFTER ACCEPTANCE OF THE SEEDING. PLANTING. AND IRRIGATION SYSTEM INSTALLATION, AND IS EXPECTED TO CONTINUE FOR A MINIMUM OF 6 MONTHS. 11. PLJ\NT ESTABLISHMENT WILL INCLUDE WATERING. IRRIGATION SYSTEM OPERATIONS AND MAINTENANCE, NON-NATIVE INVASIVE SPECIES CONTROL. DEBRIS REMOVAL. AND REPLACEMENT PLANTING AND RESEEDING If NEEDED. 12. THI: TARGET SURVIVAL RATES FOR THE REVEGETATION AT THE END OF THE PLANT ESTABLISHMENT PERIOD ARE: CONTAINER PLANTS WILL HAVE A MINIMUM OF 90% SURVIVAL. CLTTINGS WILL HAVE A MINIMUM OF 60% SURVIVAL. AND SEEDED AREAS WILL HAVE A MINIMUM vf 50% COVER WITH NATIVE VEGETATION AND FREE OF NON-NATIVE INVASIVE SPECIES. 13. SH•::>ULD CONSTRUCTION OCCUR DURING THE BIRD BREEDING/NESTING SEASON A QUALIFIED BIOLOGIST SHALL CONDUCT A FOCUSED SURVEY FOR BIRD NESTS NOT MORE TH,,N 72 HOURS BEFORE THE START OF CONSTRUCTION OPERATION. IF NESTS ARE PRESENT. NO LOUD CONSTRUCTION SHALL TAKE PLACE WITHIN 500 FEET OF ACTIVE NESTING SITI:S DURING THE NESTING/BREEDING SEASON (FEBRUARY 15 THROUGH AUGUST 30) FOR LISTED Sr>ECIES AND 300 FEET FOR All OTHER SPECIES INCLUDING RAPTORS. A BUFFER ZONE WILL BE ESTABLISHED AROUND ANY IDENTIFIED NESTS INCOORDINATION WITH THE MONITORING BIOLOGIST. IF NESTS ARE PRESENT. NO CONSTRUCTION ACTIVITIES SHALL OCCUR WITHIN ANY PORTION OF THE CONSTRUCTION ALIGNMENT WHICH WOULD RESULT IN NOISE LEVELS EXCEEDING 60 DBA HOURLY AVERAGE AT THE NESTING SITE. 14. CONSTRUCTION STAGING SHALL OCCUR IN A MANNER THAT NO OVERNIGHT STORAGE OF EQUIFMENT. CONSTRUCTION MATERIALS. OR EXCAVATED MATERIALS SHALL OCCUR WITHIN NATIVE VEGETATION AREAS. 15. A CERTIFIED ARBORIST SHALL PROVIDE WRinEN DIRECTION TO THE CONTRACTOR TO PROVIDE PROTECTION OF ROOTS, TRUNKS AND LIMBS DURING THE COURSE OF IMF LEMENTING THE WORK. ----~-----------------------------------------------·-----------------------------------------------------.::~ Balance Hydrologies, Inc. 215127 Coman Groding.dwg Bank and Channel Stabilization, Agua Hedlonda Creek, Coman property, City of Cculsbad, California DUDEK PRELIMINARY CONCEPT ONLY-NOT FOR CONSTRUCTION THESE PLANS ARE PREPARED TO COMMUNICATE PRELIMINARY CONCEPTS FOR BIOTECHNICAL TREATMENTS FOR EROSION CONTROL. SHEET 2 October 7, 2015 ©2015 Balance Hydrologies. Inc. . . . . 1" = 1 00' ~ 0 100 LEGEND: --HEC-RAS CROSS-SECTION --APPROXIMATE LIMITS OF BANK EROSION HEC-RAS WORK MAP