Erosion Potential at Storm Drain Outfalls

Transcription

1 Storm Water Management Project Draft Islandwide Assessment of Erosion Potential at Storm Drain s on the Island of Oahu State of Hawaii Department of Transportation Highways Division MARCH 2007

2 SSWMP Draft Islandwide Assessment of Erosion Potential at Storm Drain s on the Island of Oahu Appendix I.3 March 2007

3 Table of Contents CHAPTER 1 - Introduction Background Objectives... 2 CHAPTER 2 - Methodology Field Operations Quantitative Criteria... 3 CHAPTER 3 - Summary of Results Summary of Results Remediation Measures Limitations... 9 CHAPTER 4 - References Appendix A Appendix B Appendix C Appendix D Field Operations - Inspector s Checklist Top 25 High Priority s Comprehensive Listing of Sites Sites - Site Reports (electronic files) Table of Figures Figure 3.1: High Priority s... 7 Table of Tables Table 3.1: Top 25 High Priority s... 6 Table 3.2: Top 25 High Priority s Site Characterization... 8 Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 1 March 2007

4 CHAPTER 1 - INTRODUCTION 1.1 Background The Erosion Control BMP Program includes the identification and evaluation of erosion at storm drain outfalls that discharge downslope of the roadbed. The following methodology was used to derive a prioritized listing: Perform field operations; Assess and evaluate conditions; and Develop quantitative criteria for evaluating erosion at storm drain outfalls. A detailed description of the methodology is provided in Chapter Objectives The objectives of this report include the following: To identify and prioritize storm drain outfalls on the island of Oahu that discharge downslope of the roadbed based upon water quality impacts as a priority; To develop and implement a program to prevent erosion at the storm drain system outfalls. Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 2 March 2007

5 CHAPTER 2 - METHODOLOGY 2.1 Field Operations Field operations were conducted between August 2005 and October The data collection efforts consisted of identifying and documenting storm drain outfalls along State highways. Field inspection priorities focused on assessing major outfalls, which are defined as culverts and pipes with an inside diameter of 36-inches or greater. The following activities were conducted at each outfall location: Visual inspections of outfall area by a crew of one or two persons, using GPS units to locate approximate outfall location. Collect the following information about outfall area (See Appendix A for inspector s checklist): size and type (material); Condition of outfall; Condition of outfall area; Condition of outfall runoff, Water flowing from outfall; Pollution around outfall area; Photographs; and Sketch of culvert/pipe configuration 2.2 Quantitative Criteria The high priority sites were selected by a combination of factors, including the observed erosion condition, watershed priority, receiving water body classification, overland flow distance to receiving water, culvert size, and soil condition (erodibility) at the outfall location. The ranking criteria (erosion values) are based on the following equation: Erosion Value = (erosion condition factor) x (watershed factor) x (water classification factor) x (distance to receiving water factor) x (culvert size factor) x (soil erodibility factor) Erosion Condition Factor Erosion conditions were assessed by the inspectors in the field and recorded in the Condition of Outlet Runoff section of the Field Operations Inspector s Checklist. This factor was divided into four categories. The highest tier consists of those outfalls that were observed to exhibit heavy or severe erosion. These locations were assigned a weight factor of 5. locations that showed evidence of mild or moderate erosion were assigned a weight factor of 2. Light erosion was assigned a weight factor of 1 and those areas were erosion was not evident was assigned a weight factor of zero. Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 3 March 2007

6 Factor Each watershed was categorized into one of four classifications to determine the watershed factor. Critical watersheds are defined as those which have been designated by the EPA as a Wasteload Allocation (WLA). This constitutes the highest tier of the prioritization ranking and is assigned the largest weight factor of 4. The five watersheds that comprise this group are Kawa, Waimanalo, Ala Wai, Kawainui, and Kaelepulu. The second tier consists of the high priority watersheds as defined in the Consent Decree, Appendix A (Civil Action No. CV ) and is assigned a weight factor of 3. High priority watersheds include Aiea, Halawa, Kalauao, Kalihi, Kaneohe, Kapakahi, Kaukonahua, Keaahala, Kiikii, Nuuanu, Paukauila, Poamoho, Waiawa, Waikele, Waimalu, and Waipio. The third tier consists of those watersheds that appear on EPA s 303(d) list of impaired waters based on turbidity or total suspended solids. This group is assigned a weight factor of 2 and includes Anahulu, Hanauma, Helemano, Honouliuli, Kaaawa, Kahaluu, Kahaluu Segment, Kahawainui, Kapalama, Kaupuni, Kawaiiki, Kawailoa, Koko Crater, Makaha, Makaiwa, Moanalua, and Opaeula. The bottom tier consists of all remaining watersheds and is assigned a weight factor of 1. Water Classification Factor The water classification of the receiving water body was also taken into consideration in the quantitative analysis. The first category, consisting of Class A waters and Pearl Harbor Estuary, is assigned a weight factor of 1. The second category, Class AA waters, marine conservation areas, and reserves, are assigned a weight factor of 1.2, or 20% greater than the first tier. s that outfall to Class AA waters and other sensitive areas include: Manini, Kaluakauila, Anahulu, Loko Ea, Kahana, Hakipuu, Waikane, Waianu, Waiahole, Kaalaea, Haiamoa, Waihee, Kahaluu, Ahuimanu, Kahaluu segment, Heeia, Keaahala, Kaneohe, Kawa, Puu Hawaiiloa, Hanauma, and Makapuu. All remaining watersheds are assumed to drain to Class A waters or Pearl Harbor Estuary. Distance to Receiving Water Factor The proximity of the outfall location to the receiving water body was also factored into the analysis to account for sediment that may settle out prior to reaching the final discharge location. This factor is based on the distance along the approximate flow path from the outfall to the receiving water body. Flow distances through pipes and lined channels were subtracted from this measurement since it is assumed that 100 percent sediment transfer would occur through these conveyances. For outfalls near the shoreline, the distance to stream factor was terminated along any visible sandy beach (from aerial photos), rather than to the point where it contacts the ocean. The receiving water was defined as (1) a blue line or water body on the USGS map, (2) a blue line as depicted in the State s streams GIS file (darstreams.shp), or (3) a water body, as shown in the City and County of Honolulu s water body shapefile (watbod.shp). Culvert Size Factor Prioritization of sites was also determined by culvert size. Culverts with inside diameters less than 36-inches are considered minor outfalls and are assigned a weight factor of 1. Those with inside diameters of 36-inches or larger are considered major outfalls and are assigned a weight factor of 2. Multiple barrel culverts less than 36-inches in diameter with an aggregate pipe cross sectional area greater than a single 36-inch diameter culvert are classified as major outfalls for Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 4 March 2007

7 analysis purposes. Since culvert size is an indication of the contributing drainage area, the larger drainage areas were afforded a higher weighting by this method. Soil Erodibility Factor The soil type in the vicinity of each outfall location was obtained from the City and County of Honolulu s GIS layers. A corresponding K value was determined for each soil type based on USDA NRCS publications. These values ranged between 0.02 and This erodibility factor quantifies the susceptibility of soil detachment by water and is commonly used to predict longterm average soil loss. For outfalls that exit directly into a concrete channel or other lined ditch, the soil erodibility factor was set to zero. Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 5 March 2007

8 CHAPTER 3 - SUMMARY OF RESULTS 3.1 Summary of Results A total of 1,189 outfalls were documented as of October 31, Each site was evaluated for erosion potential and ranked according to the calculated erosion value. Based on this analysis, a list of the top twenty-five islandwide erosional areas was compiled (Refer to Table 3.1). As illustrated in Figure 3.1, these high priority outfall locations are scattered across the island. It should be noted that this ranking of high priority outfalls is subject to change pending a more comprehensive, site-specific engineering analysis. Site Rank Site ID # Table 3.1: Top 25 High Priority s Route # Route Milepost Erosion Value Kalanianaole Hwy H-3 Interstate Route H Likelike Hwy Kailua Road H-3 Interstate Route H H-3 Interstate Route H H-3 Interstate Route H Farrington Hwy Kalanianaole Hwy Kamehameha Hwy Wilikina Drive H-1 Interstate Route H H-1 Interstate Route H Kamehameha Hwy Wilikina Drive H-2 Interstate Route H Kamehameha Hwy H-1 Interstate Route H H-2 Interstate Route H H-2 Interstate Route H H-2 Interstate Route H Farrington Hwy Farrington Hwy Farrington Hwy H-3 Interstate Route H Eight of the top twenty-five outfalls are located in the Windward area, where critical (WLA) watersheds and Class AA waters are prevalent. The general soil classification is of the Lolekaa-Waikane association, which comprises approximately 15 percent of the island. This association is characterized by well-drained, fine to moderately fine textured soils on uplands, Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 6 March 2007

9 fans, and terraces. They formed in old alluvium and material weathered from basic igneous rock. These soils range from nearly level to very steep. Figure 3.1: High Priority s Eleven of the top twenty-five sites are located in central Oahu. The soil in this area is identified by the Helemano-Wahiawa association, which comprises approximately 18 percent of the island. This association consists of well-drained, moderately fine textured and fine textured soils on uplands which formed in material weathered from basalt. These soils are generally nearly level to moderately sloping. Five sites are located within Lualualei-Fill land-ewa association soil types. These areas consist of well-drained, fine textured and moderately fine textured soils on fans and in drainageways on the southern and western coastal plains. They formed in alluvium and are nearly level to moderately sloping. This association comprises approximately 14 percent of the island. The final site, located in Waialua, is within the Kaena-Waialua association, which occurs as a narrow band along the northern and eastern coastline on the island of Oahu. They formed in alluvium and vary widely in texture and drainage. The deep, mainly nearly level and gently sloping soils consist of poorly drained to excessively drained soils that have a fine-textured to Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 7 March 2007

10 coarse-textured subsoil or underlying material. They occur on coastal plains, talus slopes, and in drainageways. This association comprises approximately 10 percent of the island. Additional information on the Top 25 sites is provided in Table 3.2, and individual site reports for the Top 25 sites are included in Appendix B. A comprehensive list of all outfalls evaluated in the study as of October 31, 2006 is provided in Appendix C. A data disk containing electronic files of the site reports for all documented locations will be included in Appendix D in the final version. Site Rank Site ID # Table 3.2: Top 25 High Priority s Site Characterization Culvert Erosion Condition Soil Type Water Class Kaelepulu 48" CMP Heavy/Severe PYF A Kawainui 36" CMP Heavy/Severe PYF A Kalihi 4'x3' Conc. Channel Heavy/Severe KaB A Kawainui 48" RCP Heavy/Severe PkB A Kawainui 144" Sectional Plate Heavy/Severe KlaB A Kawainui 84" CMP (Buried) Heavy/Severe KlaB A Kawainui 36" CMP Heavy/Severe KlaB A Makaiwa 2-42" CMP Heavy/Severe HxA A Kaelepulu 30" CMP Heavy/Severe PYF A Waikele 9'x10' Box Culvert Heavy/Severe HLMG Estuary/A Kaukonahua 8'x8' Box Culvert Heavy/Severe HLMG A Halawa 6'x1'-6" CRM Spillway Heavy/Severe KlaB Estuary/A Aiea 42" CMP Heavy/Severe HnB Estuary/A Kaukonahua 66" CMP Heavy/Severe HLMG A Kaukonahua 36" RCP Heavy/Severe KyA A Waiawa 14' x 3' Swale Heavy/Severe KlA Estuary/A Kaukonahua 36" RCP Heavy/Severe HLMG A Waimalu 4'x2' Conc. Spillway Heavy/Severe HnB Estuary/A Waiawa 36" CMP Heavy/Severe HLMG Estuary/A 20 6 Waiawa 36" RCP Heavy/Severe HLMG Estuary/A Waiawa 36" CMP Heavy/Severe HLMG Estuary/A Makaiwa 2-120" CMP Heavy/Severe LvB A Makaiwa 2-108" CMP Heavy/Severe LvB A Kaukonahua 17'x5' Box Culvert Heavy/Severe KlA A Kaneohe 60" RCP Heavy/Severe HoB Reserve 3.2 Remediation Measures An outfall program consisting of assessment, prioritization, and implementation of remediation measures will be submitted and implemented per MS4 Permit requirements in late March assessments will continue with the completion of major outfall assessments by March 30, locations with observed erosional conditions will require the installation of velocity dissipaters or other BMP measures to reduce the risk of continued erosion at these locations. A PS&E process similar to the process used for the FY06 high priority erosional Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 8 March 2007

11 areas will be used to develop remediation methods for the prioritized outfalls. Implementation details, such as annual outfall BMP funding, have not been determined at the time of this report's completion. 3.3 Limitations The findings presented in this report are based upon information obtained from visual field inspections and as-built information. The degree of erosive conditions observed on the date of the most recent field survey is subject to change. The nature and extent of these variations may not be evident until subsequent field visits. If such variations occur, re-evaluation of the sites may be required. Additional limitations of this report include the following: s included in this analysis are limited to those sites which have been physically located in the field and surveyed by the inspectors as of October 31, The final version will include a comprehensive listing of all outfalls which traverse the State highway system or outfall into the State right-of-way to the maximum extend practicable; and The analysis is dependent on the site conditions on the day of the survey and does not take into account the contributing drainage area, slope of the culvert, or exiting velocity of the flow. Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 9 March 2007

12 CHAPTER 4 - REFERENCES City and County of Honolulu GIS Data State of Hawaii, Department of Health, Office of Environmental Planning, Water Quality Standards Map of the Island of Oahu, October State of Hawaii, Department of Transportation, As-Built Drawings. State of Hawaii, Department of Transportation GIS Data, Nov State of Hawaii, Department of Transportation, Highways Division (DOT-HWYS), Authorization To Discharge Under The National Pollutant Discharge Elimination System Permit No. HI S000001, February 28, State of Hawaii, Department of Transportation, Highways Division, Plan for the Completion of the 10 Erosion Control Projects at the Sites Listed in Consent Decree, Appendix D, July State of Hawaii, Office of Planning, GIS Data. U.S. Department of Agriculture, Natural Resources Conservation Service, Soils Report for K Factor Whole Dominant Soil, Distributed 11/21/01. U.S. Department of Agriculture, Soil Conservation Service in cooperation with the University of Hawaii Agricultural Experiment Station. General Soil Map, Oahu Island, Hawaii, January U.S. District Court For The District Of Hawaii, Civil Action No. CV HG-KSG Consent Decree With Appendices A G, January 30, 2006.U.S. Geological Survey Aerial Photography, Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page 10 March 2007

13 APPENDIX A Field Operations Inspector s Checklist Note: The terms outlet and outfall are used interchangeably on this form. Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page A.1 March 2007

14 APPENDIX B Top 25 High Priority s Individual Site Reports Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page B.1 March 2007

15 ALF Legend Stream Right-of-Way Location HnB JaC Soil Type 72 AeE Kaelepulu PYF PYD Feet AeE Waimanalo Route 72 Kalanianaole Highway Approx. MP: 1.92 : 48" CMP Erosion Condition: Heavy/Severe : Kaelepulu Soil Type: PYF Route 72 Kalanianaole Hwy R72 MP1.92

16 Legend Stream Kawa Right-of-Way Location JaC Soil Type ALF PYF 65 H-3 AeE H-3 Kawainui PYF KlaB Ph Feet MZ Interstate Route H-3 Approx. MP: : 36" CMP Erosion Condition: Heavy/Severe : Kawainui Soil Type: PYF Interstate Route H RH3 MP13.09

17 Legend Stream EaC Right-of-Way Location JaC Soil Type KlC Kalihi KaB 63 MlA Feet KaeB rrk Route 63 Likelike Highway Approx. MP: 1.65 : 4'x3' Concrete Channel Erosion Condition: Heavy/Severe : Kalihi Soil Type: KaB Route 63 Likelike Hwy R63 MP1.65

18 Legend Stream Right-of-Way Location rsy JaC Soil Type Kaelepulu Kawainui PkB Feet Route61KailuaRoad Approx. MP: 9.9 : 48" RCP Erosion Condition: Heavy/Severe : Kawainui Soil Type: PkB Route61KailuaRd R61 MP9.90

19 Legend Stream Right-of-Way Location JaC Soil Type ALF H-3 Kawainui KlaB QUARRY H-3 rsy KgC Feet ALF Interstate Route H-3 Approx. MP: : 144" Sectional Plate Erosion Condition: Heavy/Severe : Kawainui Soil Type: KlaB Interstate Route H RH3 MP12.19

20 Legend Stream Right-of-Way Location JaC Soil Type KlaB H-3 H-3 ALF Kawainui rsy QUARRY Feet Interstate Route H-3 Approx. MP: 12.4 : 84" CMP (Buried) Erosion Condition: Heavy/Severe : Kawainui Soil Type: KlaB Interstate Route H RH3 MP12.4

21 HLMG Legend Stream Right-of-Way Location JaC Soil Type ALF Kawainui KlaB H-3 H-3 rsy QUARRY Feet KgC Interstate Route H-3 Approx. MP: 12.2 : 36" CMP Erosion Condition: Heavy/Severe : Kawainui Soil Type: KlaB Interstate Route H RH3 MP12.2

22 Legend Stream Right-of-Way LvB Location JaC Soil Type 93 Makaiwa HxA EmB Feet Route 93 Farrington Highway Approx. MP: 0.34 : 2-42" RCP Erosion Condition: Heavy/Severe : Makaiwa Soil Type: HxA Route93FarringtonHwy R93 MP0.34

23 ALF Legend Stream Right-of-Way Location PYE JaC Soil Type ALF Kaelepulu 72 PYF KlaB ALF Feet Route 72 Kalanianaole Highway Approx. MP: 1.16 : 30" CMP Erosion Condition: Heavy/Severe : Kaelepulu Soil Type: PYF Route 72 Kalanianaole Hwy R72 MP1.16

24 Legend Stream Right-of-Way Location JaC Soil Type HLMG HeA Waikele HLMG Feet Route99KamehamehaHighway Approx. MP: : 9'x10' Box Culvert Erosion Condition: Heavy/Severe : Waikele Soil Type: HLMG Route99KamehamehaHwy R99 MP11.81

25 Legend Stream Right-of-WayKyB Location WaB JaC Soil Type KyA Kaukonahua 99 KuD KyA HLMG KuB FL Feet KuB Route 99 Wilikina Drive Approx. MP: 7.7 : 8'x8' Box Culvert Erosion Condition: Heavy/Severe : Kaukonahua Soil Type: HLMG Route99WilikinaDr R99 MP7.70

26 Legend Stream Right-of-Way Location HxA JaC Soil Type H-1 KlA Halawa H-1 rrk HnB LaA Feet Interstate Route H-1 Approx. MP: : 6'x1'-6" CRM Spillway Erosion Condition: Heavy/Severe : Halawa Soil Type: KlA Interstate Route H RH1 MP13.54

27 Legend Stream Right-of-Way Location WzA JaC Soil Type H-1 WzC Aiea H-1 HnB EaB rrk WzB Feet WzA Interstate Route H-1 Approx. MP: : 42" CMP Erosion Condition: Heavy/Severe : Aiea Soil Type: HnB Interstate Route H RH1 MP12.84

28 Legend Stream Right-of-Way Location JaC Soil Type WaA 80 Kaukonahua HLMG W HLMG 99 WaA Feet Route 80 Kamehameha Highway Approx. MP: 0.1 : 66" CMP Erosion Condition: Heavy/Severe : Kaukonahua Soil Type: HLMG Route80KamehamehaHwy R80 MP0.10

29 Legend Stream Right-of-Way Location HLMG JaC Soil Type HLMG W Kaukonahua KyA HLMG Feet MoB Route 99 Wilikina Drive Approx. MP: 8.78 : 36" RCP Erosion Condition: Heavy/Severe : Kaukonahua Soil Type: KyA Route99WilikinaDr R99 MP8.78

30 Legend MuB Stream Right-of-Way Location HLMG JaC Soil Type MuB rrk EaC EaB Waiawa H-2 H-2 EaB KlA EaC WzB WzA Feet Interstate Route H-2 Approx. MP: 0.4 : 14'x3' Concrete Channel Erosion Condition: Heavy/Severe : Waiawa Soil Type: KlA Interstate Route H RH2 MP0.4

31 Legend Stream Right-of-Way Location WaA WaB JaC Soil Type WaC W HLMG HLMG 80 Kaukonahua WaA Feet Route80KamehamehaHighway Approx. MP: 0.56 : 36" RCP Erosion Condition: Heavy/Severe : Kaukonahua Soil Type: HLMG Route80KamehamehaHwy R80 MP0.56

32 Legend Stream Right-of-Way Location HLMG JaC Soil Type H-1 MuB HLMG MuC H-1 rrk Waimalu HnB MuB WzC WzA Feet Ph Interstate Route H-1 Approx. MP: 11.1 : 4'x2' Concrete Spillway Erosion Condition: Heavy/Severe : Waimalu Soil Type: HnB Interstate Route H RH1 MP11.10

33 Legend Stream Right-of-Way Location JaC Soil Type Waikele HLMG H-2 WaA H-2 Waiawa Feet MpD2 Interstate Route H-2 Approx. MP: 2.59 : 36" CMP Erosion Condition: Heavy/Severe : Waiawa Soil Type: HLMG Interstate Route H RH2 MP2.59

34 Legend Stream WaA Right-of-Way Location JaC Soil Type MpD2 Waiawa LaB H-2 H-2 HLMG MpD WaB MuB Feet Interstate Route H-2 Approx. MP: 2.22 : 36" RCP Erosion Condition: Heavy/Severe : Waiawa Soil Type: HLMG Interstate Route H RH2 MP2.22

35 Legend Stream Right-of-Way Location MpB JaC Soil Type WaA H-2 Waiawa H-2 HLMG WaC MpD Feet Interstate Route H-2 Approx. MP: 3.06 : 36" CMP Erosion Condition: Heavy/Severe : Waiawa Soil Type: HLMG Interstate Route H RH2 MP3.06

36 Legend Stream Right-of-Way Location LPE EwC JaC Soil Type LvB HxB LuB Makaiwa 93 LPE Feet Route 93 Farrington Highway Approx. MP: 0.78 : 2-120" CMP Erosion Condition: Heavy/Severe : Makaiwa Soil Type: LvB Route93FarringtonHighway 0100 R93 MP0.78

37 Legend Stream Right-of-Way Location LPE EwC JaC Soil Type LvB HxB LuB Makaiwa 93 LPE Feet Route 93 Farrington Highway Approx. MP: 0.77 : 2-108" CMP Erosion Condition: Heavy/Severe : Makaiwa Soil Type: LvB Route93FarringtonHighway 0101 R93 MP0.77

38 WkA Legend Stream Right-of-Way Location W Poamoho JaC Soil Type HeA Kaukonahua KlA 930 WzA Feet Route 930 Farrington Highway Approx. MP: 6.34 : 17'x5' Box Culvert Erosion Condition: Heavy/Severe : Kaukonahua Soil Type: KlA Route 930 Farrington Highway 0486 R930 MP6.34

39 Legend Stream Right-of-Way Location JaC Soil Type LoB H-3 LoC H-3 HoB Kaneohe LoC LoE LoF Feet LoE Interstate Route H-3 Approx. MP: 9.4 : 60" RCP Erosion Condition: Heavy/Severe : Kaneohe Soil Type: HoB Interstate Route H RH3 MP9.4

40 APPENDIX C Comprehensive Listing of Sites As of October 31, 2006 Draft Islandwide Assessment of Erosion Potential at Storm Drain s On the Island of Oahu Page C.1 March 2007

41 APPENDIX C Site ID Route Mile Erosion Soil Dist. to Stream Water Class Erosion Weather Post Dist. Culvert Factor Condition Condition Factor Name Factor Type Factor Factor Class Factor Value (ft) 211 Interstate Route H Sunny 60" RCP 2 Steady Light Flow Heavy/Severe 5 Waialaenui 1 KlaB A Interstate Route H Overcast No Rain 6'x1'-6" CRM Spillway 2 No Water Heavy/Severe 5 Halawa 3 KlA Estuary Interstate Route H Overcast No Rain 60" CMP 2 No Water Heavy/Severe 5 Kaloi 1 rsy A Interstate Route H Overcast No Rain 96" CMP 2 No Water Heavy/Severe 5 Kaloi 1 EwC A Interstate Route H Overcast No Rain 24" CMP 1 No Water Heavy/Severe 5 Kaloi 1 EwC A Interstate Route H Overcast No Rain 24" CMP 1 No Water Heavy/Severe 5 Kaloi 1 KlbC A Interstate Route H Sunny 72" CMP 2 No Water Heavy/Severe 5 Kaloi 1 rsy A Interstate Route H Overcast No Rain 4'x2' Conc. Spillway 2 Heavy/Severe 5 Waimalu 3 HnB Estuary Interstate Route H Overcast No Rain 42" CMP 2 No Water Heavy/Severe 5 Aiea 3 HnB Estuary Interstate Route H Sunny 2'x1' Conc. Channel 1 No Water Heavy/Severe 5 Honouliuli 2 HLMG Estuary Interstate Route H Sunny 2'x2' Conc. Channel 1 No Water Heavy/Severe 5 Kalauao 3 LaC Estuary Interstate Route H Sunny 24" HDPE 1 No Water Heavy/Severe 5 Kalauao 3 LaC Estuary Interstate Route H Sunny 30" CMP 1 No Water Heavy/Severe 5 Kapakahi 3 MuD Estuary Interstate Route H Overcast No Rain 24" CMP 1 No Water Mild/Moderate 2 Honouliuli 2 EaB Estuary Interstate Route H Overcast No Rain 24" CMP 1 No Water Mild/Moderate 2 Honouliuli 2 HLMG Estuary Interstate Route H Overcast No Rain 48" RCP 2 Standing Water Mild/Moderate 2 Halawa 3 HxA Estuary Interstate Route H Overcast No Rain 54" RCP 2 Standing Water Mild/Moderate 2 Halawa 3 HxA Estuary Interstate Route H Sunny 24" CMP 1 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Sunny 84" CMP 2 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Sunny 24" CMP 1 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Light Rain 48" CMP 2 No Water Mild/Moderate 2 Kaloi 1 WkA A Interstate Route H Overcast No Rain 3'x4' Conc. Channel 2 No Water Mild/Moderate 2 Kaloi 1 EwC A Interstate Route H Overcast No Rain 2-10'x10' Box Culvert 2 No Water Mild/Moderate 2 Kaloi 1 KlB A Interstate Route H Overcast No Rain 8'x2' Ditch 2 No Water Mild/Moderate 2 Kaloi 1 EaB A Interstate Route H Overcast No Rain 24" CMP 1 No Water Mild/Moderate 2 Honouliuli 2 EaB Estuary Interstate Route H Sunny 24" CMP 1 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Sunny 24" CMP 1 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Sunny 42" CMP 2 No Water Mild/Moderate 2 Kaloi 1 rsy A Interstate Route H Overcast No Rain 24" CMP 1 Mild/Moderate 2 Kalauao 3 LaC Estuary Interstate Route H Overcast No Rain 4'x2' Conc. Channel 2 Mild/Moderate 2 Kalauao 3 HnB Estuary Interstate Route H Overcast No Rain 112" CMP 2 Mild/Moderate 2 Kalauao 3 HnB Estuary Interstate Route H Overcast No Rain 24" CMP 1 Mild/Moderate 2 Kalauao 3 HnB Estuary Interstate Route H Overcast No Rain 10'X6' Box Culvert 2 Mild/Moderate 2 Halawa 3 HnB Estuary Interstate Route H Overcast No Rain 66" RCP 2 Mild/Moderate 2 Halawa 3 HnB Estuary Interstate Route H Overcast No Rain 40'x10' Conc. Channel 2 Steady Light Flow Mild/Moderate 2 Aiea 3 HnB Estuary Interstate Route H Sunny 7'x5' Conc. Channel 2 No Water Mild/Moderate 2 Halawa 3 KTKE Estuary Interstate Route H Sunny 6'x4' Swale 2 No Water Mild/Moderate 2 Honouliuli 2 MuB Estuary Interstate Route H Light Rain 36" RCP 2 No Water Mild/Moderate 2 Kaloi 1 EaB A Interstate Route H Overcast No Rain 24" RCP 1 No Water Mild/Moderate 2 Kaloi 1 EaB A Interstate Route H Sunny 18" CMP 1 No Water Mild/Moderate 2 Kaloi 1 EaB A Interstate Route H Sunny 27" CMP 1 No Water Mild/Moderate 2 Kapakahi 3 WzB Estuary Interstate Route H Sunny 24" RCP 1 No Water Mild/Moderate 2 Waimalu 3 MuB Estuary Interstate Route H Overcast No Rain 24" HDPE 1 No Water Mild/Moderate 2 Waikele 3 MuC Estuary Interstate Route H Sunny 36" CMP 2 No Water Mild/Moderate 2 Kapakahi 3 WzB Estuary Interstate Route H Sunny 36" RCP 2 No Water Mild/Moderate 2 Kapakahi 3 WzB Estuary Interstate Route H Sunny 2'x1'-6" Conc. Channel 1 No Water Mild/Moderate 2 Kapakahi 3 MuD Estuary Interstate Route H " CMP 1 Light 1 Waimalu 3 HnB Estuary Interstate Route H Overcast No Rain 42" CMP 2 No Water Light 1 Kaloi 1 rsy A Interstate Route H Sunny 24" CMP 1 No Water Light 1 Waimalu 3 HnB Estuary Interstate Route H Sunny 18" RCP 1 No Water Light 1 Kaloi 1 HxA A Interstate Route H Sunny 24" RCP 1 No Water Light 1 Kaloi 1 KlA A Interstate Route H Sunny 108" CMP 2 No Water Light 1 Kaloi 1 KlaB A Interstate Route H Sunny 24" HDPE 1 No Water Light 1 Kaloi 1 KlaB A Interstate Route H Sunny 24" CMP 1 No Water Light 1 Kaloi 1 rsy A Interstate Route H Sunny 24" CMP 1 No Water Light 1 Manoa-Palolo 1 KlA AA Interstate Route H Sunny 24" CMP 1 No Water Light 1 Manoa-Palolo 1 MlA AA Interstate Route H Sunny 24" CMP 1 No Water Light 1 Manoa-Palolo 1 KlA AA Interstate Route H Sunny 24" RCP 1 Standing Water Light 1 Halawa 3 MdB Estuary Interstate Route H Sunny 24" CMP 1 No Water Light 1 Honouliuli 2 HLMG Estuary Interstate Route H Sunny 24" HDPE 1 No Water Light 1 Waimalu 3 HnB Estuary Interstate Route H Sunny 24" HDPE 1 No Water Light 1 Waimalu 3 rrk Estuary Interstate Route H Sunny 24" HDPE 1 No Water Light 1 Waimalu 3 HnB Estuary Page C.2 of C.20

42 APPENDIX C Site ID Route Mile Erosion Soil Dist. to Stream Water Class Erosion Weather Post Dist. Culvert Factor Condition Condition Factor Name Factor Type Factor Factor Class Factor Value (ft) 1205 Interstate Route H Sunny 24" CMP 1 No Water Light 1 Waikele 3 MuB Estuary Interstate Route H Sunny 30" CMP 1 No Water Light 1 Waikele 3 MuC Estuary Interstate Route H Sunny 36" HDPE 2 No Water Light 1 Waikele 3 MuC Estuary Interstate Route H Sunny 30" RCP 1 No Water Light 1 Kaloi 1 HxA A Interstate Route H Sunny 4'x2' Box Culvert 2 No Water Light 1 Kaloi 1 EaB A Interstate Route H Sunny 36" RCP 2 No Water Light 1 Kaloi 1 EaB A Interstate Route H Sunny 24" RCP 1 No Water Light 1 Kapakahi 3 WzB Estuary Interstate Route H Sunny 24" RCP 1 No Water Light 1 Waimalu 3 MuB Estuary Interstate Route H Sunny 2'x1' Conc. Channel 1 No Water Light 1 Kapakahi 3 WzB Estuary Interstate Route H " Sectional Plate 2 None 0 Waimalu 3 HnB Estuary Interstate Route H " CMP 1 None 0 Kalauao 3 LaC Estuary Interstate Route H Sunny 42" RCP 2 No Water None 0 Makiki 1 MkA AA Interstate Route H Sunny 7'x4' Box Culvert 2 Steady Light Flow None 0 Manoa-Palolo 1 KlA AA Interstate Route H Sunny 8'x4' Box Culvert 2 Standing Water None 0 Waialaenui 1 EwC A Interstate Route H Sunny 36" RCP 2 Steady Light Flow None 0 Nuuanu 3 KaB A Interstate Route H Sunny 10'-8"x4' Box Culvert 2 Steady Light Flow None 0 Nuuanu 3 KaB A Interstate Route H Sunny 36" CMP 2 No Water None 0 Aiea 3 WzC Estuary Interstate Route H Sunny 120" CMP 2 No Water None 0 Aiea 3 WzC Estuary Interstate Route H Overcast No Rain 2-84" CMP 2 Steady Light Flow None 0 Kapakahi 3 WzA Estuary Interstate Route H Overcast No Rain 2-48" CMP 2 Steady Light Flow None 0 Kapakahi 3 WzA Estuary Interstate Route H Overcast No Rain 7'x4' Box Culvert 2 Steady Light Flow None 0 Kapalama 2 HnA A Interstate Route H Overcast No Rain 6'x4' Box Culvert 2 Steady Mild Flow None 0 Kapalama 2 HnA A Interstate Route H Light Rain 36" RCP 2 Steady Light Flow None 0 Halawa 3 KlA Estuary Interstate Route H Heavy Rain 24" RCP 1 No Water None 0 Halawa 3 KlA Estuary Interstate Route H Heavy Rain 6'x1'-6" Conc. Channel 2 Standing Water None 0 Halawa 3 KlA Estuary Interstate Route H Sunny 36" CMP 2 Heavy Flow None 0 Waikele 3 HeA Estuary Interstate Route H Sunny 36" CMP 2 Heavy Flow None 0 Waikele 3 HeA Estuary Interstate Route H Sunny 30" CMP 1 Heavy Flow None 0 Waikele 3 HeA Estuary Interstate Route H Sunny 6'x3' Box Culvert 2 No Water None 0 Kaloi 1 EaB A Interstate Route H Sunny 120" CMP 2 No Water None 0 Kaloi 1 rsy A Interstate Route H Sunny 54" RCP 2 Steady Mild Flow None 0 Waimalu 3 Ph Estuary Interstate Route H Sunny 30" RCP 1 Steady Light Flow None 0 Kaloi 1 HxA A Interstate Route H Sunny 48" RCP 2 Steady Light Flow None 0 Kaloi 1 HxA A Interstate Route H Sunny 24" RCP 1 No Water None 0 Kaloi 1 EaB A Interstate Route H Sunny 24" RCP 1 Steady Light Flow None 0 Kaloi 1 MnC A Interstate Route H Sunny 8'x3' Box Culvert 2 No Water None 0 Kaloi 1 EaB A Interstate Route H Sunny 24" RCP 1 No Water None 0 Kaloi 1 WlB A Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kaloi 1 KlaB A Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kaloi 1 MuD A Interstate Route H Sunny 30'x10' Box Culvert 2 Steady Light Flow None 0 Kaloi 1 KlaB A Interstate Route H Overcast No Rain 24" CMP 1 None 0 Waimalu 3 HLMG Estuary Interstate Route H Overcast No Rain 24" CMP 1 None 0 Waimalu 3 HnB Estuary Interstate Route H Overcast No Rain 108" CMP 2 None 0 Halawa 3 MdB Estuary Interstate Route H Sunny 30" CMP 1 No Water None 0 Kalihi 3 MlA A Interstate Route H Sunny 42" CMP 2 Steady Light Flow None 0 Kalihi 3 MlA A Interstate Route H Sunny 24" CMP 1 No Water None 0 Kalihi 3 MlA A Interstate Route H Sunny 24" CMP 1 No Water None 0 Kapalama 2 HnA A Interstate Route H Sunny 27" CMP 1 No Water None 0 Kapalama 2 HnA A Interstate Route H Sunny 18" CMP 1 No Water None 0 Kapalama 2 HnA A Interstate Route H Sunny 30" CMP 1 No Water None 0 Kapalama 2 HnA A Interstate Route H Sunny 42" RCP 2 No Water None 0 Ala Wai 4 MkA A Interstate Route H Sunny 8'x3' Box Culvert 2 Steady Mild Flow None 0 Ala Wai 4 MkA A Interstate Route H Sunny 12" RCP 1 No Water None 0 Waimalu 3 Ph Estuary Interstate Route H Sunny 12" RCP 1 No Water None 0 Waimalu 3 Ph Estuary Interstate Route H Sunny 24" RCP 1 No Water None 0 Waimalu 3 Ph Estuary Interstate Route H Overcast No Rain 30" CMP 1 No Water None 0 Aiea 3 HnB Estuary Interstate Route H Overcast No Rain 30" CMP 1 No Water None 0 Aiea 3 HnB Estuary Interstate Route H Sunny 6'x2' Conc. Channel 2 No Water None 0 Honouliuli 2 HLMG Estuary Interstate Route H Sunny 30" CMP 1 No Water None 0 Honouliuli 2 KyA Estuary Interstate Route H Overcast No Rain 48" RCP 2 Steady Light Flow None 0 Kapalama 2 HnA A Interstate Route H Sunny 1 No Water None 0 Kaloi 1 WkA A Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kaloi 1 KlaB A Page C.3 of C.20

43 APPENDIX C Site ID Route Mile Erosion Soil Dist. to Stream Water Class Erosion Weather Post Dist. Culvert Factor Condition Condition Factor Name Factor Type Factor Factor Class Factor Value (ft) 955 Interstate Route H Sunny 4'x3' CRM Channel 2 No Water None 0 Kaloi 1 KlaB A Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kaloi 1 KlaB A Interstate Route H Sunny 4'x3' CRM Channel 2 No Water None 0 Kaloi 1 KlaB A Interstate Route H Sunny 2-7'x7' Box Culvert 2 Standing Water None 0 Manuwai 1 MnC A Interstate Route H Sunny 8'x5' Box Culvert 2 Steady Light Flow None 0 Ala Wai 4 MkA A Interstate Route H Sunny 54" CMP 2 Steady Light Flow None 0 Ala Wai 4 MkA A Interstate Route H Sunny 24" CMP 1 No Water None 0 Halawa 3 MdB Estuary Interstate Route H Sunny 1 No Water None 0 Halawa 3 MdB Estuary Interstate Route H Sunny 102" CMP 2 No Water None 0 Halawa 3 rrk Estuary Interstate Route H Sunny 2'x2' Conc. Channel 1 Steady Mild Flow None 0 Kalauao 3 LaC Estuary Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kalauao 3 LaC Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Honouliuli 2 HLMG Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Honouliuli 2 HLMG Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Waimalu 3 MuB Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Waimalu 3 MuB Estuary Interstate Route H Sunny 24" HDPE 1 No Water None 0 Waimalu 3 HnB Estuary Interstate Route H Sunny 9'x6'-6" Box Culvert 2 Steady Light Flow None 0 Waimalu 3 MuC Estuary Interstate Route H Sunny 24" RCP 1 No Water None 0 Waimalu 3 MuC Estuary Interstate Route H Overcast No Rain 18" CMP 1 Standing Water None 0 Kaloi 1 EaB A Interstate Route H Overcast No Rain 48" CMP 2 No Water None 0 Waiawa 3 WzB Estuary Interstate Route H Sunny 21" RCP 1 No Water None 0 Kaloi 1 EaB A Interstate Route H Sunny 4'x2' Box Culvert 2 No Water None 0 Kaloi 1 EaB A Interstate Route H Sunny 24" RCP 1 No Water None 0 Kaloi 1 MuB A Interstate Route H Sunny 24" RCP 1 No Water None 0 Kaloi 1 MuB A Interstate Route H Sunny 24" HDPE 1 No Water None 0 Kaloi 1 KlaB A Interstate Route H Sunny 8'x4' Box Culvert 2 No Water None 0 Kaloi 1 EwA A Interstate Route H Sunny 4'x2' Box Culvert 2 No Water None 0 Kaloi 1 HxA A Interstate Route H Sunny 30" RCP 1 No Water None 0 Kaloi 1 HxA A Interstate Route H Overcast No Rain 27" RCP 1 No Water None 0 Waikele 3 MuC Estuary Interstate Route H Sunny 24" RCP 1 No Water None 0 Waimalu 3 MuC Estuary Interstate Route H Light Rain 72" SRMP 2 No Water None 0 Waikele 3 MuC Estuary Interstate Route H Overcast No Rain 3-168" SRMP 2 No Water None 0 Waikele 3 MuC Estuary Interstate Route H Overcast No Rain 24" HDPE 1 No Water None 0 Waikele 3 MuC Estuary Interstate Route H Sunny 5'x5' Conc. Channel 2 Steady Light Flow None 0 Halawa 3 MdB Estuary Interstate Route H Sunny 36" CMP 2 Standing Water None 0 Halawa 3 KlA Estuary Interstate Route H Overcast No Rain 30" RCP 1 Steady Light Flow None 0 Manuwai 1 MdB A Interstate Route H Overcast No Rain 42" CMP 2 No Water None 0 Manuwai 1 MdB A Interstate Route H Overcast No Rain 27" CMP 1 No Water None 0 Manuwai 1 MdB A Interstate Route H Overcast No Rain 24" CMP 1 No Water None 0 Manuwai 1 MdB A Interstate Route H Sunny 60" RCP 2 No Water None 0 Waikele 3 MuC Estuary Interstate Route H Sunny 7'x1'-6" Conc. Channel 2 No Water None 0 Kapakahi 3 WzB Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Kapakahi 3 WzB Estuary Interstate Route H Sunny 10'x6' Conc. Channel 2 Steady Light Flow None 0 Kapakahi 3 WzB Estuary Interstate Route H Sunny 48" CMP 2 Steady Light Flow None 0 Kapakahi 3 WzB Estuary Interstate Route H " Pipe 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H " CMP 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H " RCP 2 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Overcast No Rain 36" CMP 2 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Sunny 2'x2' Conc. Spillway 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Sunny 24" CMP 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Heavy Rain 24" CMP 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Heavy Rain 36" CMP 2 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Heavy Rain 24" CMP 1 Heavy/Severe 5 Waiawa 3 HLMG Estuary Interstate Route H Sunny 14'x3' Conc. Channel 2 No Water Heavy/Severe 5 Waiawa 3 KlA Estuary Interstate Route H Sunny 30" CMP 1 No Water Heavy/Severe 5 Waiawa 3 KlA Estuary Interstate Route H " CMP 2 Mild/Moderate 2 Waiawa 3 HLMG Estuary Interstate Route H Wet But Not Raining 3-60" CMP 2 No Water Mild/Moderate 2 Waiawa 3 MuB Estuary Interstate Route H Wet But Not Raining 30" RCP 1 No Water Mild/Moderate 2 Kaukonahua 3 HLMG A Interstate Route H Overcast No Rain 24" CMP 1 No Water Mild/Moderate 2 Waiawa 3 HLMG Estuary Interstate Route H Overcast No Rain 24" CMP 1 No Water Mild/Moderate 2 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 2'x2' Conc. Channel 1 No Water Mild/Moderate 2 Waikele 3 HLMG Estuary Interstate Route H Light Rain 30" CMP 1 Standing Water Mild/Moderate 2 Waiawa 3 WaB Estuary Page C.4 of C.20

44 APPENDIX C Site ID Route Mile Erosion Soil Dist. to Stream Water Class Erosion Weather Post Dist. Culvert Factor Condition Condition Factor Name Factor Type Factor Factor Class Factor Value (ft) 570 Interstate Route H Overcast No Rain 36" RCP 2 No Water Mild/Moderate 2 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 24" CMP 1 Mild/Moderate 2 Waiawa 3 WaC Estuary Interstate Route H Overcast No Rain 2'x1' Conc. Spillway 1 Mild/Moderate 2 Waiawa 3 WaA Estuary Interstate Route H Overcast No Rain 36" CMP 2 Mild/Moderate 2 Waiawa 3 HLMG Estuary Interstate Route H Light Rain 24" CMP 1 no flow Mild/Moderate 2 Waiawa 3 MpB Estuary Interstate Route H Sunny 2-42" CMP 2 No Water Mild/Moderate 2 Waiawa 3 EaB Estuary Interstate Route H Sunny 24" CMP 1 No Water Mild/Moderate 2 Waiawa 3 EaB Estuary Interstate Route H Sunny 48" CMP 2 No Water Mild/Moderate 2 Waiawa 3 KlA Estuary Interstate Route H Light Rain 30" RCP 1 No Water Light 1 Kaukonahua 3 HLMG A Interstate Route H Heavy Rain 24" CMP 1 Light 1 Waiawa 3 MpB Estuary Interstate Route H Sunny 60" CMP 2 Light 1 Waiawa 3 rrk Estuary Interstate Route H " Pipe 2 None 0 Waiawa 3 HLMG Estuary Interstate Route H " Pipe 1 None 0 Waiawa 3 HLMG Estuary Interstate Route H " CMP 2 None 0 Waikele 3 HLMG Estuary Interstate Route H Wet But Not Raining 24" CMP 1 Standing Water None 0 Waikele 3 WaA Estuary Interstate Route H Wet But Not Raining 3'x3' Conc. Channel 2 Steady Light Flow None 0 Waikele 3 WaA Estuary Interstate Route H Wet But Not Raining 24" RCP 1 No Water None 0 Waikele 3 WaA Estuary Interstate Route H Overcast No Rain 24" CMP 1 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 24" RCP 1 No Water None 0 Waikele 3 WaA Estuary Interstate Route H Overcast No Rain 36" CMP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 30" CMP 1 No Water None 0 Waikele 3 WaB Estuary Interstate Route H Overcast No Rain 7'x1'-6" Conc. Channel 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 9'x2'-6" Conc. Channel 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 36" RCP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 140" CMP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 24" RCP 1 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 36" RCP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 36" CMP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 48" CMP 2 No Water None 0 Waikele 3 HLMG Estuary Interstate Route H Overcast No Rain 8'x2' Conc. Spillway 2 None 0 Waiawa 3 WaA Estuary Interstate Route H Overcast No Rain 24" CMP 1 None 0 Waiawa 3 WaA Estuary Interstate Route H Overcast No Rain 24" CMP 1 None 0 Waiawa 3 HLMG Estuary Interstate Route H Sunny 24" CMP 1 None 0 Waiawa 3 MuB Estuary Interstate Route H Sunny 24" CMP 1 None 0 Waiawa 3 MuB Estuary Interstate Route H Sunny 7' Wide Conc. Gutter 2 None 0 Waiawa 3 MpD Estuary Interstate Route H Sunny 30" CMP 1 No Water None 0 Waikele 3 WaA Estuary Interstate Route H Sunny 24" RCP 1 No Water None 0 Waikele 3 WaA Estuary Interstate Route H Sunny 54" CMP 2 No Water None 0 Waiawa 3 WzB Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Waiawa 3 WzB Estuary Interstate Route H Sunny 24" CMP 1 No Water None 0 Waiawa 3 KlA Estuary Interstate Route H Sunny 24" RCP 1 No Water None 0 Waiawa 3 KlA Estuary Interstate Route H Wet But Not Raining 42" RCP 2 Standing Water Heavy/Severe 5 Kaneohe 3 LoF Reserve Interstate Route H Wet But Not Raining 60" RCP 2 Standing Water Heavy/Severe 5 Kaneohe 3 HoB Reserve Interstate Route H Wet But Not Raining 30" CMP 1 Standing Water Heavy/Severe 5 Kaneohe 3 HoB Reserve Interstate Route H Sunny 72" RCP 2 No Water Heavy/Severe 5 Kaneohe 3 LoD AA Interstate Route H Sunny 36" CMP 2 No Water Heavy/Severe 5 Kawainui 4 KlaB A Interstate Route H Sunny 84" CMP (Buried) 2 No Water Heavy/Severe 5 Kawainui 4 KlaB A Interstate Route H Sunny 4'x2' Conc. Spillway 2 No Water Heavy/Severe 5 Puu Hawaiiloa 1 rsy AA Interstate Route H Sunny 36" CMP 2 No Water Heavy/Severe 5 Kawainui 4 PYF A Interstate Route H Sunny 42" CMP 2 No Water Heavy/Severe 5 Puu Hawaiiloa 1 KtC AA Interstate Route H Sunny 24" CMP 1 Standing Water Heavy/Severe 5 Kawainui 4 KlaB A Interstate Route H Overcast No Rain 24" CMP 1 No Water Heavy/Severe 5 Kawainui 4 KlaB A Interstate Route H Sunny 24" CMP 1 No Water Heavy/Severe 5 Puu Hawaiiloa 1 PYE AA Interstate Route H Sunny 2'x2' Swale 1 No Water Heavy/Severe 5 Puu Hawaiiloa 1 ALF AA Interstate Route H Sunny 144" Sectional Plate 2 Steady Light Flow Heavy/Severe 5 Kawainui 4 KlaB A Interstate Route H Overcast No Rain 24" CMP 1 No Water Heavy/Severe 5 Puu Hawaiiloa 1 KtC AA Interstate Route H Overcast No Rain 7'x2'-6" Swale 2 No Water Heavy/Severe 5 Puu Hawaiiloa 1 KtC AA Interstate Route H Overcast No Rain 36" CMP 2 No Water Heavy/Severe 5 Puu Hawaiiloa 1 KlaB AA Interstate Route H Overcast No Rain 30" RCP 1 No Water Heavy/Severe 5 Kaneohe 3 LoE Reserve Interstate Route H Wet But Not Raining 9'x8' Box Culvert 2 No Water Mild/Moderate 2 Kaneohe 3 HnB Reserve Interstate Route H Wet But Not Raining 84" CMP 2 Standing Water Mild/Moderate 2 Kaneohe 3 LoF Reserve Interstate Route H Wet But Not Raining 60" CMP 2 No Water Mild/Moderate 2 Kaneohe 3 LoE Reserve Page C.5 of C.20