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HomeMy WebLinkAboutDrainage Master Plan-1988 DRAINAGE MASTER PLAN TOWN OF EMERALD ISLE, NORTH CAROLINA AUGUST, 1987 REVISED FEBRUARY, 1988 Prepared For: Board of Commissioners, Planning Board and Citizens of Emerald Isle, North Carolina Prepared By: HENRY VON OESEN AND ASSOCIATES, INC. Consulting Engineers & Planners 805 North Third Street ** P. 0. Drawer 2087 Wilmington; North Carolina 28402 (919) 763-0141 The preparation of this report and associated maps was financed in part through a grant provided by the North Carolina Coastal Management Program, through funds provide -I the Coastal Zone Management Act of 1972, as amended, which is admin-Lstered by the Office of Ocean and Coastal Resource Management, National Oceanic and Atmospheric Administration. 3008 (021188) 1 Table of Contents SECTION 1: INTRODUCTION AND SCOPE OF WORK ' 1.1 Introduction ..................................... 0...... 1-1 1.2 Scope of Work..........................................1-1 1.3 Background Information.................................1-3 ' 1.4 Aerial PhotograpY,.- and Topographic Maps ................ 1-4 1.5 Public Participation...................................1-4 SECTION 2: =STING CONDITIONS 2.1 Physical Setting.......................................2-1 2.2 Existing Development and Land Use Patterns.............2-1 ' 2.3 Topography, Surface Waters, Soils and Areas of Environmental Concern (AEC's) .........................2-2 ' 2.3.1 Topography and Surface Waters...................2-2 2.3.2 Soils...........................................2-3 -2.3.3 Areas of Environmental Concern ..................2-3 ' Maps 2.3.2.1 A&B: Soils Maps Table 2.3.2.1: Estimated Soils Properties ' Significant to Engineering 2.4 Climate/Rainfall Intensity and Duration................2-4 ' 2.4.1 Climatic Summary.. .... ......................2-4 2.4.2 Rainfall Intensity/Duration .....................2-4 ' Table 2.4.2.1: Inches of Rainfall for Various Recurrence and Accumulation Times for ' Southern Coastal Area of North Carolina ' 2.5 Existing State Coastal Area Stormwater Control Regulations....................................2-4 ' 2.6 Applicability of Existing StoruvaterControl Regulations to Emerald Isle, NC.. .....•.•••••• .2-7 ' Figure 2.6.1: Stormwater System Design SECTION 3: DRAMGE STUDY METHODS ' 3.1 General................................................3-1 3.2 Run -Off Calculations...................................3-1 Table of Contents,'Continued SECTION 4: IDENTIFICATION OF EXISTING MAJOR DRAINAGE PROBLEM AREAS AIM THEIR POSSIBLE SOLUTIONS 4.1 Priorization of Projects Based on Severity of Need ..... 4-1 4.2 Listing of Problem Areas and Possible Solutions ........ 4-2 4.3 Reccmma�Aed Solutions/Estimated Costs..................4-4 4.3.1 Recommended Solutions ...........................4-4 4.3.2 Preliminary Cost Estimates ......................4-8 4.3.3 Maintenance of Drainage Systems.................4-11 Figure 4.3.1.1: Proposed Improvements, Coast Guard Road '(Near Reed Drive) Figure 4.3.1.2: Proposed Inprovemerts, Sand Castle/Doe/Deer Horn Area Figure 4.3.1.3: Proposed Improvements, Ocean Drive (Cedar Tree to Matt Drive) Figure 4.3.1.4: Proposed Improvements, Ocean Drive (5 th to 18th Streets) Figure 4.3.1.5: Proposed Improvements, Sand Castle (Pinewood to Sea Dunes) Figure 4.3.1.6: Proposed Improvements, Sound Drive (Bogue Inlet to Live Oak) Figure 4.3.1.7: Proposed Improvements, Reed Drive (at Bay Berry) Figure 4.3.1.8: Proposed Improvements, Coast Guard Road (Island Circle) SECTION 5: PROJECT IMPLEMENi'ATION 5.1 General................................................5-1 5.2 Project Scheduling....... .... 000— ... oo—o—o—o—o.5-1 5.3 Project Funding........................................5-1 SECTION 6: LOCAL REGULATORY CONTRCL STRATBSIES 6.1 General................................................6-1 6.2 Strategy for Stornwater Control ........................6-1 6.3 Draft Stormwater Control Ordinance .....................6-3 Table of Contents, Continued SECTION 7 : SUMMA-RY, CONCLUSIONS AND RECCbMDATIONS 7.1 Summary and Conclusions................................7-1 7.2 Recanmendations........................................7-3 APPENDICES A TOPOGRAPHIC MAPS OF EMERALD ISLE B CLEV%TIC .-KZ2'lARY C EXISTING COASTAL AREA STORP?AIATE R CONTROL REGULATIONS D MODEL STORM RATER CONTROL ORDINANCE FOR EMERALD ISLE, NORTH CAROLINA n L J J DRAINAGE MASTER PLAN TOWN OF EMERALD ISLEr NORTH CAROLINA SECTION 1: INTRODUCTION AND SCOPE OF WORK aD This study was commissioned by the Board of Commissioners of the Town of Emerald Islet North Carolina in Marchr 1986 to provide a comprehensiver rational drainage master plan for programming -needed future improvements to the Town's existing drainage systems and for the orderly development of new drainage systems in areas which are currently undeveloped or not fully developed. The study and report to follow centers on the area within the existing Town limits of Emerald Isle. The study covers both piped systems and open "natural" systems including canals and creeks within the Town limits. This study was conducted by the firm of Henry von Oesen and Associates, Inc.r Consulting Engineers and Planners. Wilmingtonr NC. Aerial photogrammetric mapping of the Town on which the plan is based was prepared by the firm of Landmark Engineering of Cary t NC. 1.2 $_q.4PP_ 4� .WQ_rk The s::udy consisted of the follow n—.7 major work elements: • Coordinate the production of a set of aerial photographs and contour maps of the Town to meet map requirements of 1" = 100 feet and contour intervals of 2 feet. (Note: Aerial 1 - 1 photography and photogrammetric mapping were conducted by ' Landmark Engineering of Cary, NC under separate contract with the Town of Emerald Isle) . -_ • Establish necessary vertical and horizontal control points ("ground truth") following the aerial mapping procedure. ' • Locate and map all existing drainage facilities including ' storm drains► creeks, catch basins► culverts, open ditches and drop inlets. ' • Record information on existing pipe sizes, pipe types, and_ invert elevations (tied to existing bench marks) on the ' contour maps. ' • Locate major drainage boundaries and drainage basin sub- areas on the contour maps. ' • Conduct interviews and discussions with Town personnel and other knowledgeable individuals concerning the nature of ' the existing drainage system and the nature and extent of ' existing problem areas. • Identify existing and future potential problem areas on the ' contour maps. • Prepare preliminary designs of drainage systems for each of ' the existing problem areas. ' • Determine preliminary estimated costs associated with the proposed drainage improvements and assign each project a ' priority based on needs predicated on a set of accepted criteria. ' • Develop a project financial plan and explore sources of ' potential grant assistance, if any. 1 - 2 t• Present the draft master plan to the local government and the N. C. Division of Coastal Management for review and ' approval. 1.3 ���1t9�41dD�7 II?4�Lna4D ' In November. 1985 the Town of Emerald Isle experienced severe flooding due to a series of rainstorms which resulted in an ' accumulation of 17 inches of rain in one week. Several Town streets were rendered impassable., for days and several lots were inundated for weeks following this unusually severe wet weather event. The Town took emergency action to alleviate these ' conditions. Portable pumping equipment was used to lower water levels and some ditching of critical areas was accomplished. However► in recognition of the severity of the -problems that had become manifest► the Town proceeded to seek outside technical ' assistance towards a long term resolution of the problem. In March, 1986 the Town Board of Commissioners selected the ' consulting engineering firm of Henry von Oesen and Associates► ' Inc. of Wilmington, NC to prepare a drainage master plan in accord with the aforementioned scope of work. In October► 1986 the Town was awarded a Coastal Area Management Act Grant in the amount of $19,520 to aid in the preparation of this master plan. ' ,,/ This is an unofficial ally of the rainfall quantity as published in the ���.g�,rgt �Q��y_1g��_Sm��. As shown in ' Table 2.4.2.1 following., it represents a 100-year recurrent interval storm in terms of rainfall accumulation. 1 1 - 3 1 4 Aerial photographic flights of the Town of Emerald Isle were completed in December, 1986 by Landmark Engineering, Inc. Photogrammetric topographic maps at a scale of 1" = 100 feet with contour intervals of two (2) feet were completed in late June, 1987. A total of fifty (50) maps (24" x 3611) provide total coverage of the Town. The original mylars of the topographic maps provided by Landmark Engineering were subsequently reproduced and enhanced with standard legends and an index (key) map etc., by modern reprographic techniques. A complete set of copies of reduced versions of these enhanced topographic maps are appended to this report (see Appendix A) .2_/ One full set of both of the original Landmark Engineering mylars and the enhanced mylars have been provided to the Town of Emerald Isle for its use. 1.5 P��� i� �a r ti cipa ion As required by Coastal Management Regulations, public participation was encouraged in the development of this plan. To this end the results of the topographic mapping of the Town and the identification of problem areas was presented at a joint meeting of the Town Board and Planning Board held on July 20, 2:/ Note: The reduced maps are included to show the locations of certain key topographic features (interdunal troughs), drainage basin boundaries and problem areas. For detailed planning and design, the large maps held by the Town of Emerald Isle should be used. Copies of individual sheets may be obtained from the Town at a nominal fee. 1 - 4 ' 1987 at the Town Hall. The meeting was well attended by the . general public and ample opportunity was provided to answer ' citizens' concerns and questions. A complete summary, of this ' meeting is available at Emerald Isle Town Hall. Additional opportunities for public input and citizen involvement will be ' afforded during =:he plan implementation phase of this project (see Section 5 below) . 1 1 1-5 M M ■■r Gom m m r m r r �w �r w MM 2A THE NEWS-11MEs Morehead City-aeaufert, N.C. Friday, Nov. 13, Ifq Price tog: $1.2 million Town approves concept By Jeff Joan age problem in that area the worst, (ty of Island Ckscla Connector ae.e Trmw Nye wrltir and suggested the road be raised 18 ditches wereneeded,lheengineerra- Emerald Isle corm, usloners last Inches "to prevent a catastrophic ported. He estimated the cost at Tuesday right Itthe concept of people at the western end of IM,800. of a storm water management mar the island." fie estimated the cart of the correcting the problem ats162,000, "It might be prudent to take one or ter plan prepared for We resort now- munity, by Henry von Osseo i Aso-' ' ' O Sand Castle Drive, Doe Drlve two of these projects Per fiscal ciates, consulting engineers from sold Deer Rory Drive. Collector year," Mr. Burnell advised the town you could try to do all of boarWilmington. ditcheswouldwould be needed to solve them alt oonnce." problems In those areas, Mr. Bur - Bill Burnett, an employee of the Oesen firm, presented a rough nett sold. The cast was estimated at But whatever the board decided, draft of the plan, a thick volume of — the engineer recommended that lop Zoo plus pages and 50 Myler top*-, t O Ocean Drive tram Cedar Tree priority be given to the- first graphical maps of the town.Gommis-' Lan° to Matt Drive. Correction "problem area" on the list. Coast sioners met in the town hall.. would involve use of a sump pump Guard Road near Reed Drive. _ and pipe leading to the beach, where The master plan Identities eight runoff water would be dumped to per- The eight drainage projects could major drainage problems in Emer• colate through the sand before re- be funded from general fund reve- Wd Isle, and estimates the cost of turning to the ocean. He called the nues, which would Involve a sharing correcting them at $1.2 million. The proposal a "new concept," one that of costs by the entire town, Mr. Bur - plan includes a storm water control might wind up being a lest case be- nett said. "But not all residents are ordinance aimed alpreventingdrain- fore state regulatory agencies. The affected, so you may want to con - age problems in /afore development cost, he said, would approach eider an alternative: a special as - projects on the Island. $258,700• sessment program." Development of the pl.m was O Ocean Drive from SO Street to i8th Street. Sump pump and pipe sys- An assessment program would prompted byextremely #easyrab, In November 1885, w•he; an ell• temwouldbeneeded.Mr.Burnetles- Place the financial burden on those who benefit. Mr. Burnett suggested mated 17 inches of rain fell in just a llmated the cost at i500,11U0. the town establish "benefit zones," few days, flooding many areas In ❑ Sand Castle Drive from Pine- an that those whose property was di - town. wood Drive to Sea Dunes Drive. Col- rectly affected by the projects would The master plan, the first of Its lection and storage of storm water pay more than those who wouldbene kind in the 20county region affected were addressed In the rough draft. lit indirectly from the work. by the Coastal Area Management The cost was estimated at W.000. Act, suggests priorities for review of O Sound Drive from Bogue Inlef Procedures for the assessment drainage matters and for action on Drive to Live Oak. Similar collection Problem are outlined In state stat- them. But Mr. Burnett told coirmis- and storage problems were noted.as utes, according to the engineer. sioners they would have the final The cost of correcllon w estimated Those procedures Include board ac- say. The plan was offered as a geld: at 817 3f10 tlon by resolution and public hear- Ime. Logs. allowing residents to comment ❑ Rent Drive at Bayberry Road. on the proposal. Problem areas, in the order they Collection and storage problems were listed, follow: were listed. Mr. Burnett estimated Mr. Burnett urged the board to O Coast Guard Road near Reed the correction cost at $36.200. adopt controls for the future. "The Drive. Mr. Burnette called thedram. O Coast Guard Road to the vicia• town Is only 51 to 52 percent devel- of. master drainageplan.�l oped," be sold. lie suggested action That the figures dui not include the sumps to handle forced movement of - should be taken no later than nest cost of easements, ruraff. spring. •The figures aren't set In car Elwood Slocum, a resident, es - Crete. But they are our best sell- pressed his concern lbat raislri The corm water control ordl- mates," which he characterized as Coed Guard Road 18 Inches wotlf.Q nonce recommended in the rough ..Conservative... crate a dam of aorta• lie also asks4 draft Is based on modals from Texas and South Carolina. el the Commiask+ners If" voted 8-0 to the that the board force developer* whose create drainageprot' ordinance pus the burden*'Basically, those on t " accept plaster plaµ but with the understanding that I may be lead- projects toms to be responsible for soluffoo>i o to ke wishing to develop landma sure that drainage problems areo't filed alter a careful review by llq IolhnoseProDlems.11epointedtoP4 crealed by their development Prof town. Me Beach condominiums as an es- xd' eels. During the "comments from the public" portion of the agenda, at the ; ample. PcoP "You should make these le i The ordinance is designed to pro- and of the meeting. Lee Messner, a resident on Trade Winds Drive, sponsthle; ' Mr. Slocum said. Dorothy Metzler, a resident, ma A ill feet an inter-0unal trough system asked how much the town had spent a similar comment moments later. that is vital to drainage in the Wand having the master drainage plan de• She urged commissioners to adopt community. It includes a manual of veloped. the master plan prepared by Hem7( recommended dorm water develop Wade Horne, town administrator, von Oesen and Associates '.'to makd meat practices. "This. tordinaacel replied that the survey cost f7As00, developers responsible." a% won't preclude development, but It will allow the lows to be sensitive to but that 75 percent of that was pr! The town adminWralor als,o for the problems. And It meets the date's vided by the state, through the Ddvl- voiced support master play storrn water runoff regulations," &ion of Coastal management, Depart. But headded that while the plan ideq- Mr.Burnetlsaid. meal of Natural Resources andCom- filled draina a problems, and way{ g P He added that the proposal would mMr. Development. er the need Mr. Messpending d to solve them, It would not cure 'al erythd altered the a" meet requirements for current run- at &mtud for spending that amount, Plus a a en t you biz s fundamental truth: "I/ you buy a off regulations, to handle the "Grit projected muttonto. ectwonder •V lowlot,you get alow lot" . Bush" from a storm, 1'h inches of "I der drainage problems. "I wonder cog ficthis Attending they in a, runoff. The ordinance would not It necessary for a once u ills meng. were to those already ed, were. meet earlier requirements, recently rescinded, deal with the first aK - cop IWstoryo(-the weather-0ureau hap n Byll commissioners Ben Byland A.H. inches of runoff. peNng."the November 1985deluge. Crew end Bea Pase; Jackie Paying Mr. Burnett called the higher don-He He also questioned the wisdom of town clerk; Steve Harrell, buildiQ lard sought by a number Coast Guard Road 18 inches, linspector; Bob Conrad, module r upsenv, un- mental and conservation groups, so- and wondered haw much land would nonce supervisor; Nark Wilson, po have to be set aside to provide stor- lice chief; Dale Johnson, tire chief; necessary. age areas for storm water runoff, or and Richard Stanley, town attorney. Mayor PmTern Walt G askins, pre- siding in the absence of Mayor Lib lleverly, asked It the figures quoted in the master plan included engi- neering and construction costs. Yes," Mr. Burnell replied. But In answer to a question from Commis- sioner Pete Leo, the engineer noted 1 ' SECTION 2: EXISTING CONDITIONS ' 2.1 ghy���l_E�T19 The Town of Emerald Isle is located on the western third of ' Bogue Banks, North Carolina, and has a land area of approximately 3,337 acres including both developable and undevelopable ' (conservation) areas. As one of the most attractive barrier ' island communities on the North Carolina coast, much of the Town is wooded with remnants of maritime forest and has dunes 20 to 35 ' feet high along the oceanfront. The interior land elevation ranges between 6 and 25 feet above sea * level. Bogue Sound, on ' the north side of the Town is quite shallow. Islands and ' wetlands enhance the scenic value of the soundfront area. The Town, now with about 51 percent of the total land (or 59.1 percent of the developable land) developed, is eleven miles long with a width of 41-000 feet on the western end and 800 feet on the ' eastern end. Some of the large remaining undeveloped parcels ' located at the western extremity of the Town are in 1,100-foot wide lots (locally called "blocks") and extend from,the ocean to ' the sound. 2.2 isA�p��g�4p1eA_ ails E�11� S]s�_�att�ll� ' According to information presented in the 1986 Emerald Isle ' Coastal Area Management Act Land Use Plan Update. of Emerald Isle's 3,337 acres of land approximately 1,616 acres (48 percent) ' is develoned with residential land uses of various types including single family homes, duplexesf hotels, motels. ' apartments and condominiums, about 79 acres (2 percent) is 1 developed for commercial uses of various types including 1 2 - 1 recreational uses, and about 13 acres (0.4 percent) are developed f or institutional, government, utilities and other miscellaneous uses. Thus, about 1,708 acres of the 3,337 total acres of land or 51 percent is developed leaving about 1,629 acres yet undeveloped. However, of this latter total only about 1,184 acres are developable under current local, regional and btate regulations. The Town's zoning ordinance allows a maximum density of 8 dwelling units per acre for all future development. 2.3 TQQQ�p1zY1_�1����e i���t S1_�Q�$_�2 &� es3 Q �Dv i�4i�►gA� 2.3 .1 As evidenced by the topographic maps which accompany this report (see Appendix A), the major topographic features are the high dunes along the beachfront and the undulating relict dunes and interdunal troughs in the area landward of the f oredunes. It is immediately obvious to even the most casual observer that the most important topographic features relative to drainage are the multiple interdunal troughs which form the principal sites of groundwater recharge to the surf icial sand aquifer. Due to the presence of organic based soils in some of the interdunal troughs, water is retained all year long. In most cases, however, the soils in the interdunal troughs are permeable and water retention is relatively brief and only occurs during very wet weather periods. Emerald Isle is surrounded on three sides by water, the Atlantic Ocean on the south, Bogue Inlet on the west and Bogue Sound on the north. One tidal creek, Archers Creek, penetrates 2 - 2 ' into the land mass north of Emerald_ Drive from Bogue Inlet Drive to Lee Avenue and provides a natural drainage outlet ("line sink") for adjacent lands. Waters of the Atlantic Ocean are ' classified "SB" suitable for swimming and body contact recreation and all other sound waters are classified "SA" for shellfishing. ' 2 . 3 . 2 ' Map 2.3.2.1 Parts A and B show the soil types at Emerald Isle. Table 2.3.2.1 provides brief descriptions of the soil P P ' ty pes.and pertinent engineering characteristics with regard to drainage. Soils information included herein is based on ' information by ' the Carteret County Office the Soil provided of ' Conservation Service. 2.3 .3 B��a�_4_DY�QD�►�At��_�o��g�Il - ' The areas of environmental concern (AEC's) in Emerald Isle as defined in Coastal Area Management Act Regulations include ' coastal wetlands, estuarine waters, estuarine shorelines, public ' trust areas, ocean erodible areas, high hazard flood areas, and inlet hazard areas. Full definitions and descriptions of these 1 areas are found in the 1986 Emerald Isle Coastal Area Management Act Land Use Plan Update and so are not repeated herein. The locations of the AEC's are shown on the zoning map (see Map 2.2.1 in the 1986 Land Use Plan). It is important that the improvements recommended in this ' plan not adversely impact any of the AEC's. Engineering and regulatory control methods which can be used to accomplish this ' goal are set forth in Sections 5 and 6 of this report. 1 2 - 3 343000 &L D 541000 L 530000 337000 335000 333000 BOGUE SOUND BOGUE INLET CH 331000 i I � 2571000 2573000 25750001, 2577000 2579000 MAP 2.3.2.11 PART A GENERAL SOILS MAP TOWN OF EMERALD ISLE. N. C. EMERALD ISLE DRAINAGE MASTER PLAN I LAND RESOURCES SCALE 1: 15840 Cr) INFORMATION SERVICE 1 INCH = 1320 FT i 11 17 1982 IC NC DEPT OF NR&CD EMERAL. SOIL. A. P1 --J 919/733-2090 ORIG SCALE 1: 24000 NORTH HENRY VON OESEN & ASSOCIATES 0 CH NO �L NO CL ND BOGUE SOUND -- N C N ND ND \` CL L C0 W Z J CL CL CL _._.---� FR e -- -�� HEY TO SOIL TYPES NC - LABEL SEPTIC TANK NO. ABBREV. NAME SUITABILITY / 3 SH BEACH-FOREDUNE ASSOC. VERY SEVERE ATLANTIC OCEAN 18 CH CARTERET SOILS, HIGH VERY SEVERE 6 CL CARTERET SOILS, LOW VERY SEVERE 7 CO COROLLA FINE SAND SEVERE 10 CU COROLLA URBAN LAND COMPLEX SEVERE 12 DU DUCKSTON FINE SAND SEVERE 15 FR FRIPP FINE SAND SLIGHT 22 NC NEWHAN- COROLLA COMPLEX SLIGHT 10 NO NEWHAN SAND DREDGED PHASE VERY SEVERE 24 NE NEWHAN-URBAN LAND COMPLEX SLIGHT 2561000 25f131-0 25950o0 2597000 2568000 2591000 2593000 2595000 2507000 2599000 CONSULTING ENGINEERS 89 PLANNERS NOTES THIS MAP IS BASED ON INFORMATION FROM THE SOIL SURVEY OF THE OUTER BANKS, NORTH CAROLINA. 1977, PRODUCED BY THE USDA SOIL CONSERVATION SERVICE IN COOPERATION WITH NORTH CAROLINA'S DEPARTMENT OF NATIONAL RESOURCES AND COMMUNITY DEVELOPMENT. LABEL NUMBERS CORRESPOND TO MAP SYMBOLS ON THAT SURVEY. WILMINGTON, N.C. 3008 349000 348000 C L 844000 y L �TEB 34,2000 N W 2 J c� a 340000 3"000 J U 2800000 2802000 2804000 2808000 260E000 MAP 2.3.2.1 , PART B GENERAL SOILS MAP TOWN OF EMERALD ISLE , N. G: EMERALID ISLE DRAINAGE MASTER PLAN LAND RESOURCES INFORMATION SERVICE SCRLE 1: 15840 1 INCH = 1320 FT 11 17 1982 EMERAL. SOIL. B. P1 ORIG SCALE 1: 24000 NORTH HENRY VON OESEN a ASSOCIATES DU ROGUE SOUND Nc C L cc H KEY TO SOIL TYPES LABEL SEPTIC TANK ATLANTIC OCEAN NO. ABBREV. NAME SUITABILITY 3 SH BEACH-FOREOUNE ASSOC. VERY SEVERE 18 CH CARTERET SOILS, HIGH VERY SEVERE 6 CL CARTERET SOILS, LOW VERY SEVERE 7 CO COROLLA FINE SAND SEVERE 10 CU COROLLA URBAN LAND COMPLEX SEVERE 12 DU DUCKSTON FINE SAND SEVERE IS FR FRIPP FINE SAND SLIGHT 22 NC NEWHAN-COROLLA COMPLEX SLIGHT 10 NO NEWHAN SAND DREDGED PHASE VERY SEVERE 24 NE NEWHAN-URBAN LAND COMPLEX SLIGHT i 2610000 2612000 2814000 2018000 2819000 2620000 2822600 2824000 2028000 2529000 NOTE: THIS MAP IS BASED ON INFORMATION FROM THE SOIL SURVEY OF THE OUTER BANKS, NORTH CAROLINA, 1977, PRODUCED BY THE USDA SOIL,CONSERVATI-ON SERVICE IN COOPERATION WITH NORTH CAROLINA'S DEPARTMENT OF NATIONAL RESOURCES AND COMMUNITY DEVELOPMENT. LABEL NUMBERS CORRESPOND TO MAP SYMBOLS ON THAT SURVEY. CONSULTING ENGINEERS & PLANNERS WILMINGTON, N.C. J 3008 I 1 TABLE LAND TYPES HIGH W= TA= FLOM PERMEABILITY] ESTIMATED SOMS PROPERTIES SIGNIFICANT TO ENGINEERING K! '1199101" #3 Bead- Bead - 0 to Frequent Rapid 6.3" hr. Foredune 3.0' Association F redunes 6.0' - Rare #4 Bohicket 0 to 3.0' Frequent (daily) Slow 0.0611/hr. soils, low #6 Carteret 0 to 3.0' Frequent (daily) Rapid 6.3"/hr. Boils, low #7 Corolla 1.5 to 3.0' Rare to Common Very rapid fine sand Storm Tides 20"/hr. #8 Corolla fine Rare High Very rapid sands forested 1.5 to 3.0' Storm Tides 20"/hr. #9 Oorolla-Duck- Rare to Common Very rapid stone Caw-lex 1.0 to 3.0' Storm Tides 20"/hr. #10 Dredge_cQil 0' Rare Storm Tides Rapid 6 3"/hr #11 Hobonny Moderate 0.63 soils -0-to 2.01 Frequent (monthly) to 2 0"/hr #12 Duckstone Rare to Canwn Very rapid fine sand 1.0 to 2.01 Storm Tides 20"/hr #13 Duckstone f ine sand. Rare to Common Very rapid forested 1 0 to 2.01 Storm Tides 20"/hr, Very rapid #14 Duneland 6.0' None 20"/hr, .. fine ..1. 6.01 Rare ! Source: Soil Conservation Service. Table 2.3.2.1, Oontinued Estimated Soils Properties Significant to Engineering MAP SYMBCL, DEPRH M SEASCNAL LAM TYPES HIGiMATER TABLEFWM PERMEABILITY #16 Levy soils 0 to 2.0' Frequent (monthly) Slow 0.06-2.0"/hr. .#17 Madel=d 3.0' Rare Storm Tides __ Rapid 6.311/hr. #18 Carteret soils, Mgr 1.0 to 3.0' Frequent (monthly) Rapid 6.3"/hr. ' #19 Carteret 0 to 3.0' Frequent (monthly) Rapid 6.311/hr. soils ' #20 Currituck 0 to 3.0' Frequent (monthly)., soils Rapid 6.3"/hr.. #21 Newhan fine 6.0' None Very rapid sand 20"/hr. ' #22 Newhan- Corolla Complex -- See ratings for individual soil -- #23 Duneland ' Newhan Complex -- See ratings for individual soil --- #24 Newhan Urban Land Complex -- See ratings for individual soil -- #25 Wando f ine 6.0' None Very rapid sand 20"/hr. #26 Conaby soils 0 to 1.0' Surface Rapid 6.3"/hr. ' pQnding #27 Echaw fine 2.5 to 5.0' None Rapid 6.3"/hr. sand #28 f ine 6.0' None 6.3"/hr. sand Rureb Rapid #29 Currituck 0 to 2.0' Frequent (monthly) Rapid 6.3"/hr. soils, high ' #30 Bohicket 0 to 3.0' F:equent 'daily) Slcw 0.06"/hr, .' Table 2.3.2.1j, Oontinued DEGREE AND KIND OF LIMITATION FOR STATED USE MAP SYMBOL, LAND TYPES DWELLINGS STREETS & ROADS SEPTIC TANK FILTER FIELD ' #1 Beach, occa- on sially flooded Very severe/ flooding Very flooding severe/ Very flooding severe/ #2 Leon fine Severe/high Severe/high Very severe/ ' sand water table water table igh water table #3 Beach- Very severe/ Very severe/ Very severe Foredune Association flooding flooding flooding 44 Bohicket Very severe/ Very severe/ Very severe/ ' so -its, low flooding wet flooding wet flooding wet Very severe/ Very severe/ Very severe/ '5 Tidal Flats flooding wet/ flooding wet/ flooding/wet #6 Carteret Very -severe/ Very severe/ Very severe/ ' Soilsr low flooding/wet flooding/wet flooding/wet #7 Corolla fine sand Severe/wet Severe/wet SevereZmtl #8 Corolla fine sand. forested Severe/wet Severe/wet Severe/wet ' #9 Corolla -Duck - stone Complex Severe/wet Severe/wet Severe/wetl ' #10 Dredge Spoil Severe Severe Severel #11 Hobonny Very severe/ Very severe/ Very severe/ soils flooding wet flooding/wet flooding -wet #12 Duckstone ' fine sand Sewere/mmt Semere/`'mot Severe�-iffltl #13 Duckstone fine sand, forested Severe/wet Severe/wit Severe/wetl #14 Duneland Severe/unstable Severe/steep Severe/unstable due to blowing slope, blowing due to blowing sand sand sand #15 Fripp fine sand Severe floods Moderate floods Slightl ' Table 2.3.2.1,, Continued Degree and Kind of Limitation for Stated Use _ MAP SYMBCLP LAND TYPES DWELLINGS STREETS & RDADS SEPTIC TANK FITTER FTELD Very severe/ #16 Levy soils floods/wet Very floods/wet severe/ Very severe/ floods/wet ' #17 Madelan_d Severe Sevc :e Severel #18 Carteret Very severe/ Very severe/ Very severe/ soilsr high flooding/wet flooding/wet- flooding wet #19 Carteret Very severe/ Very severe/ Very severe/ ' soils flooding/wet flooding/wet flooding/wet #20 Currituck Very severe/ floodingZmt Very severe/ Very severe/ ' soils floodingjwet flooding/wet #21 Newhan fine sand Slight Slight Slightl ' #22 Newnan - Corolla Complex — -See ratings for individual soil — #23 Duneland- Ne an Complex — See ratings for individual soil — #24 Newnan Urban Land Complex — See ratings for individual soil — #25 Wando fine sand Slight Slight Slightl ' #26 Conaby soils Very severe/ floods/wet Very floods/y+t severe/ Very severe/ floods/wet ' #27 Ediav fine Moderate/wetness Moderate/wetness Severe/wetnessl sand blowing sand #28 Kureb fine sand Slight Slight Slightl ' #29 Currituck soils, high Very severe/ Very severe/ floods/y-,t flx-jg/wet Very severe/ floods/wet ' #30 Bohicket soils, high Very severe/ Very severe/ floods/wet floods/wet Very severe/ floods/wet llhe sandy soils are highly previous with questionable filtering capacities. ' Thus, contamination of groundwater is possible. F ' 2.4 Climate/Rainfall Intensity and Duration- 2.4.1 Climatic Summary ' . The National Climate Data Center in Ashville, NC has compiled- ' a summary description of the area climate based on the Morehead City, NC location somewhat northeast of the study area. That ' de::.�cription is found in Appendix B. 2.4.2 Rainfall Intensity/Duration ' Table 2.4.2.1 summarizes rainfall intensity and -duration data ' compiled from historicAl rainfall records by the U. S. Weather Bureau and applicable to rainfall events in the southern coastal ' area of North Carolina including Emerald Isle. Annual rainfall for Emerald Isle averages 52 inches. 2.5 Existing State Coastal Area Stormwater Control Regulations ' The N. C. Environmental Management Commission (NCEMC) adopted regulations to control stormwater runoff on November 12, 1987. The regulations have an effective date of January 1, 1988. The ' regulations impose certain constraints on development in the 20 coastal counties of North Carolina with special emphasis on ' controls on development proximate to estuarine waters classified SA (for shellfishing) . Following is a summary of the ' regulations. (Note: A copy of the complete regulations are ' found in Appendix C.). Stormwater control measures are required on any development ' activities in the area of jurisdiction which r?-T ire a CAMA major development permit or a sedimentation/erosion control plan with ' the following exceptions: 1 2 - 4 w re TABLE 2.4.2.1 INCITES OF RAINFALL FOR VARIOUS RECURRENCE AND ACCUMULATION TIMES FOR SOUTHERN COASTAL NORTH .CAROLINA PERIOD OF RAINFALL COLLECTION 30 MIN 1 11R 2 HR 3 IIR 6 IIR 12 IIR 1 DAY 2 DAY 4 DAY 7 DAY 10 DAY 1 YEAR 1.2 1.6N 2.0 2.2 2.5 3.0 3.5 2 YEAR 1.6 2.0 2.4 2.5 3.0 4.0 4.5 5.5 6.0 7.0 8.0. 5 YEAR 2.0 2.4 3.0 3.5 4.0 5.0 .6.0 7.0 8.0 9.5 10.0 10 YEAR 2.2 2.8 3.5 4.0 4.5 6.0 7.0 8.0 9.0 10.0 12.0 25 YEAR 2.6 -3.4 4.0 4.5 5.0 6.5 8.0 9.0 11.0 13.0 14.0 50 YEAR 2.8 3.8 4.5 5.0 6.0 7.5 9.0 10.0 13.0 15.0 1.6.0 100 YEAR 3.0 4.0 5.0 5.5 7.0 8.5 10.0 12.0 15.0 17.0 17.0 SOURCES: Data for one day or less are from U.S. Department of Commerce, Weather Bureau Technical Paper No. 40, Rainfall Frequency Atlas of. the U.S., 1961'. ' Data for greater than one day are from U.S. Department of Commerce, Weather Bureau Technical Paper No. 49, 2-10 Day Precipitation for Return Periods of 2-100^years in the Contiguous U.S. (1) The project site is one acre -or less; (2) The project site drains to SA waters or unnamed tributaries to SA waters and has a built.upon area of 25 ' percent or less; (3) The project site drains to waters other than SA and has ' built upon area of 30 percEnt or less; (4) The runoff from the project site is controlled through ' an off -site stormwater system meeting certain provisions ' of the proposed regulations.and permitted; or (5) The Director of NCDEM certifies that the. site is ' situated such that water quality standards and uses are not threatened regardless of the type and degree of ' development. _ ' Standard (non -innovative) stormwater control measures which can be approved according to the proposed regulations include: ' (1) Stormwater infiltration devices including infiltration basins/ponds, swales, and porous pavement; and ' (2) Wet detention ponds. ' For projects draining to Class SA waters, the following design criteria must be observed: ' (1) Direct outlet channels or pipes to SA waters are prohibited unless otherwise permitted in accordance with ' the regulations. 1 1 2 - 5 (2) Infiltration control systems must be designed to control the runoff from all impervious surfaces generated by one 1./ and one-half (1.5) inches of rainfall. The size of the system must take into account the runoff from any impervious surfaces draining to the system. (3) Runoff in excess of the design volume must flow overland through a vegetative buffer with a minimum length of 50 feet measured from the mean high water line of SA waters., For projects not draining to Class SA waters, the following design criteria are to be used: (1) Infiltration control systems must be designed to control the runoff from all impervious surfaces generated by one 2./ (1) inch of rainfall. The size of the system must take into account the runoff from any impervious surfaces draining to the system. (2) As a design alternative, wet detention ponds may be designed for 85 percent removal of total suspended solids. (3) Additional control measures may be required on a case -by -case basis to protect sensitive waters or specific water uses. l./ According to Table 2.4.2.1, this represents a 2-year storm of 30 minutes duration or a one year storm of one hour duration. 2./ According to Table 2.4.2.1, this represents a 1-year storm of 30 minutes duration. 2 - 6 tInfiltration systems may be designed -to provide infiltration of the entire design rainfall volume required for a site or a ' series of successive systems may be utilized. Infiltration may also be used to pretreat runoff to wet detention ponds. A wet ' detention pond can be used as a primary treatment device or as a ' secondary device following an infiltration'syster. Wet.detention ponds must be designed for a specific pollutant removal according ' to modeling techniques approved by the Director of NCDEM. — Vegetative buffers can be used as a non-structural method for providing additional infiltration, filtering of pollutants and ' minimizing stormwater impacts. The regulations allow for the application of innovative ' measures for controlling stormwater which are not well ' established through actual experience. Such measures may be approved on a demonstration basis under the following conditions: ' (1) There is a reasonable expectation that the control measures will be successful; (2) The projects are not located near sensitive waters; ' (3) Monitoring requirements are included to verify the performance of the control measures; and ' (4) Alternatives are available if the control measures fail. 2.6 Applicability of Existing Stormwater Control Regulations to ' Emerald Isle ' In view of the recent adoption of the final stormwater regulations by NCDEM, preliminary designs and control strategies ' developed in this plan will be based on the following set of assumptions: 1 2 - 7 e Applicability of State stormwater control regulations to all of Emerald Isle. •Appropriate and applicable exemption criteria of the adopted regulations. • A "design storm" of 2 years, 30 minutes duration (1.5 inches of rain) which Is the worst case situation imposed by the adopted regulations for discharges to SA waters. Figure 2.6.1 presents a flow chart which illustrates how one works through_ the design of stormwater control system for any site at Emerald Isle. IS PROJECT LOCATED IN COASTAL COUNTIES, INCLUDING BEAUFORT, BERTIE, BRUNSWICK, DESIGN BASED ON EROSION CONTROL ' CAMDEN, CARTERET, CHOWAN, CRAVEN, CURRITUCK, DARE, CATES, HERTFORD, HYDE, NEW IF NO ` REGULATIONS BY THE STATE OR LOCAL HANOVER, ONSLOW, PAMLICO, PASQUOTANK, PENDER, PERQUIMANS, TYRRELL OR WASHING- PERMITTING AGENCY TON? t IF YES IS PROJECT EXEMPT? 1. LESS THAN ONE ACRE. 2. DRAINS TO "SA" WATERS; BUILT UPON AREA < 25% OR SINGLE FAMILY LOTS _> 1/3-ACRE; BUILT UPON AREA < 2500 AND NO STORMWATER COLLECTION SYSTEM; BUILT UPON AREA IS > 30 FEET FROM SURFACE WATER. 3. DRAINS TO WATERS OTHER THAN "SA"; BUILT UPON AREA < 3096 OR SINGLE FAMILY LOTS > 1/3-ACRE; BUILT UPON AREA < 3000 AND NO STORMWATER COLLECTION SYSTEM; BUILT UPON AREA IS > 30 FEET FROM SURFACE WATERS. 4. CONTROLS RUNOFF WITH OFF -SITE STORMWATER SYSTEM PER G.S. 143-215.1(D). 5. REDEVELOPMENT MEETS THE REQUIREMENTS AS PRACTICAL. 6. MEETS PROVISIONS OF DEM EXCEPT HAS BOAT RAMPS PUBLIC ROADS AND BRIDGES WHICH MINIMIZE JMPERVIOUS SURFACES, AND DIVERT STORMWATER AWAY FROM SURFACE WATERS AS MUCH AS POSSIBLE TO MINIMIZE WATER QUALITY IMPACTS. 7. CERTIFIED BY DEM DIRECTOR THAT WATER QUALITY NOT THREATENED. A. NOT CLOSE TO SALINE WATERS OR FRESH WATER NURSERY AREAS. B. STORMWATER CONTROLS IN LIEU OF REQUIRE- MENTS. PROJECT DRAINS DIRECTLY TO "SA" WATERS DIRECT OUTLET CHANNELS OR PIPES PROHIBITED INFILTRATION CONTROL SYSTEM RUNOFF FROM ALL IMPERVIOUS SURFACES FOR 1-1/2" RAINFALL. MUST ALSO ACCOUNT FOR ALL AREA DRAINING TO SYSTEM. (REQUIREMENTS LISTED AT RIGHT) VEGETATIVE FILTER REQUIRED FOR ALL RUNOFF IN EXCESS OF THE 1-1/2" RAINFALL. MINIMUM WIDTH 50 FEET TO MEAN HIGH WATER OF "SA" WATERS. PROJECT NOT DRAINING DIRECTLY TO I "SA" WATERS INFILTRATION SYSTEM RUNOFF FROM ALL IMPERVIOUS SURFACES FOR 1" RAINFALL. MUST ALSO ACCOUNT FOR ALL AREA DRAINING TO SYSTEM. 1. MINIMUM 30 FEET FROM SURFACE WATERS; 50 FEET FOR "SA" WATERS. 2. MINIMUM 100 FEET FROM WATER SUPPLY WELLS. 3. BOTTOM OF SYSTEM MINIMUM OF 2 FEET ABOVE SEASONAL HIGH WATER TABLE. 4. RUNOFF IN EXCESS OF DESIGN VOLUME BY- PASSES SYSTEM. 5. DRAW -DOWN WITHIN 5 DAYS HYDROGEOLOGIC EVALUATION MAY BE REQUIRED. 6. SOILS MUST HAVE MINIMUM HYDRAULIC CON- DUCTIVITY OF 0.52 INCHES PER HOUR. 7. NOT TO BE SITED ON OR IN FILL MATERIAL. 8. OBSERVATION WELL REQUIRED FOR SYSTEM INSPECTION. 9. IF RUNOFF IS DIRECTED TO INFILTRATION SYSTEMS DURING CONSTRUCTION, SYSTEM MUST BE RESTORED TO MEET DESIGN SPECS. WET DETENTION POND 85-PERCENT REMOVAL OF TOTAL SUSPENDED SOLIDS IN THE PERMANENT POOL AND STORAGE OF RUNOFF FROM A 1" RAINFALL ABOVE THE PERMANENT POOL LEVEL. 1. DESIGN STORAGE VOLUME SHALL BE ABOVE THE PERMANENT POOL. 2. POND DRAW -DOWN IN NOT LESS THAN 2 DAYS AND NO MORE THAN 5 DAYS. 3. MEAN DEPTH IS 3 FEET. 4. INLET STRUCTURE MUST MINIMIZE TURBU- LENCE USING BAFFLES OR OTHER DESIGN FEATURES. 5. PRETREATMENT OF RUNOFF BY USE OF IN- FILTRATION SWALES IS ENCOURAGED TO MINIMIZE SEDIMENTATION. VEGETATIVE FILTER 1. DISTRIBUTION DEVICE 2. MINIMUM WIDTH 30 FEET TO RECEIVING STREAM 3.. NON -EROSIVE VELOCITY FOR 10-YEAR, 24- HOUR STORM WITH A 10-YEAR, 1-HOUR IN- TENSITY (SLOPE < 5ro). 3. NATURAL VEGETATION, GRASSES OR ARTIFI- CIALLY PLANTED WETLAND VEGETATION. 0&M PLAN OR MANUAL REQUIRED, RESPONSIBLE PARTY FIGURE 2.6.1 ' SECTION 3: DRAINAGE STUDY METHODS ' 3.1 fg=r-42 Following the receipt of the corrected mylar topographic maps from Landmark Engineering► Inc., all existing drainage structures ' were located and plotted on tae topographic maps. After this, the area within the Town limits was divided into drainage basins. ' Due to the unique topography of Emerald Isle, there are few major ' drainage basins per se.' --Instead the community is characterized by a multiple series of relatively small subbasins as shown on ' the map sheets (see Appendix A). A total of 191 subbasins are identified on the maps. Each subbasin is identified with a num- ber and the limits of the basins as defined are. shown on the 50 ' reduced size topographic map sheets which accompany this report. Also shown on these maps are all existing drainage structures that were located during the field survey segment of this study. Once the drainage subbasins were defined, meetings were held ' with Town personnel to identify the major problem areas (areas ' where flooding and/or standing water occurred during the last major storm event of November, 1985). These areas are evident on ' the appended map sheets. Following the identification of the major problem areas, alternatives for their proposed solution were identified and analyzed (see Section 4) based on anticipated ' run-off quantities. 3.2 B1dA—Q_��1�9 ns ' Where applicable, the Rational Method was used to estimate stormwater quantities expected within problem areas because of ' 3 - 1 the relatively small areas involved. As set .out in the basic project requirementsr th-e stormwater quantities were developed for each subbasin for- a 2-year recurrent interval rainfall event. with a 24-hour -duration (4.5- inches of rain) . The basic formula for the Rational Method is Q = ClAr in which 'IQ" represents the peak run-off in cubic feet per second (cfa) , "C" is a run-off coefficient depending on the physical characteristics of the drainage area. "iw is the average rainfall intensity in inches per hour (in./hr.) . and "A". is_. the size of the drainage area in acres- (ac.) . The use of the Rational Method is based on the following assumptions: (1) The peak rate of run-off at any point is a direct function of the average rainfall intensity during the time of concentration_to that point. (2) The frequency of the peak discharge is the same as the frequency of the average rainfall intensity. (3) The time of concentration is the time required for the run-off to become established and flow from the most remote part of the drainage area to the point under design. The run-off coefficient "C" was calculated for each major problem area using the relative degree of development. This involved the development of a composite run-off coeff icienc for each problem subbasin based on the percentage of different types of surfaces in the drainage area. In other words► areas which have a high degree of impervious surfaces (pavement, roofs, etc.) 3 - 2 r ' will have a higher composite run-off coefficient than areas with lesser levels of such development. For the purposes of preliminary engineering design of drai-nage improvements. a 7 composite runoff co -efficient _of 0 3 w5 as used. The estimated quantities of stormwater run-off for each ' problem subbasin w..s tabulated for the 2-year design storm event. Following the run-off calculationst an analysis of the existing storm drainage system was developed using the two (2) year storm ' water quantities. The 2-year storm was selected as the "preliminary design storm" because of the prohibitive costs involved in sizing drainage systems for larger rainfall events. Also, the 2-year storm was used because it forms the basis of existing coastal stormwater regulations (see Section 2.5 above) ' and represents an effective control of the "first flush" of a rainfall event which normally carries the bulk of pollutants to the receiving waters. - It should be noted here that it will not be technically possible or economically feasible to design drainage systems or controls to prevent all adverse effects of a similar 100-year storm which affected Emerald Isle in 1985. However, designing ' systems and regulatory controls around the 2 year storm will prevent an exacerbation of conditions which could turn a future ' 100 year rainfall event into a real disaster with a potential for Y severe loss of life and/or property. This approach, therefoe, represents a realistic attempt to get the problem under control ' now before future development or redevelopment precludes cost effective control measures. 3 3 C.-JA'u, CO _Wt�� SECTION 4 : IDENTIFICATION OF E KTMIM MAJOR MAINAGE PRCBLEM ARFAS AMID MMIR ' POSSIBLE SOLUTIONS 4.1 Priorization of Projects Erased on Severity of Need A total of eight (8) major problem areas were identified during this study. The following criteria were used in determining the priority of the projects recammended herein. The relative importance of each of the criteria ' is presented in descending order: - • Public Safety: Does the drainage problem present a hazard to public ' safety? Can sufficient flooding occur to cause injury, drowning, or limit evacuation of an area during severe storm events which will 1 preceed a hurricane or a northeaster of the 1962 "Ash Wednesday" storm magnitude? • Property Damage: Could drainage problems cause damage to private property either by flooding or by erosion caused by high velocity stormwater? • Receiving Waters: Could the drainage problem cause problems in the ' receiving waters such as siltation, erosion or closure of shellfish waters? • Public Nuisance: Does the stormvater cause a nuisance to the public in terms of minor flooding which would interfere with traffic or preclude temporary use of parking areas? In addition to these objective factors listed above, public inpat. frrn citizens, Town officials and staff personnel, as gleaned fran several public meetings, was used to modify or adjust priorities somewhat to conform to local ' 4 - 1 desires and needs. This "socio-political" factor is subjective in nature, but nevertheless, influential in the development of final priorities for such projects. 4.2 Listing of Problem Areas and -Possible Solutions The following list of problem areas is presented in order of descending priority based on the criteria presented in Section 4.1 above. The problem areas are located on the topographic maps (see Appendix A): (1) Coast Gzard Road (Near Reed Drive) - Refer to Maps 11 and 14. • Problem: When this road floods it severely limits access to the west end 'of Rnerald Isle and affects a large r miber of property owners. • Possible Solutions: a. Raise the road. b. Improve roadside ditch system with outlet to Highway 58. Create small recharge areas instead of allowing it to collect to one point. c. Combination of a and b. d. Restrict future development. (2) Sand Castle/Doe/Deer Horn Area - Refer to Maps 11 and 14. • Problem: Area flooding. - • Possible Solutions: a. Create roadside storage areas. b. Ditch area to existing drainage system west of area. c. Restrict future develcgnent. (3) Ocean Drive (Cedar Tree to Matt Drive) - Refer to Map 36. • Prcblem: Area and street flooding. 4 - 2 o Possible Solutions: ' a. Raise road sufficiently to allow passage for emergency - vehicles. b. Create roadside ditch swale/storage area. c. Construct lift statics with force main along with a spray dispersal system cn the ocean. front. d. In_ ose restrictions on future development. (4) _Ocean Drive (Fifth to Eighteenth Streets) - Refer to Maps 44, 45, 46, 47, 48 and 49 - ' • Prablem/Soluticns• (Same as No. 3). (5) Sand Castle (Pinewood -to Sea Dunes) - Refer to Map 11. ' • Problem: Area flooding. • Possible Solution: Create roadside storage areas with ditch to ' existing drainage system about cage block west. (6) Sound Drive (Bogue Inlet to Live oak) - Refer to Map 21. • Problem: Area flooding. ' • Possible Solutions: a. Create roadside ditches/recharge area. ' b. Restrict future development (7) Reed Drive (At Bayberry) - Refer to Map 19. ' • Problem: Area flooding. ' • Possible Solutions: a. Swale construction. tb. Ccmnect to existing drainage system. ' c. Restrict future development. 4 - 3 (8) Coast Guard Road (Island Circle) - Refer to Maps 3 and 4. • Problem: Area flooding. • Possible Solutions: a. Ditch area between Coast Guard Road to Cbarnlel Drive. b. Stabilize ditches recently constructed by the Town. c. Restrict future development. 4.3 Recammmded Solutions/Estimated Costs This section will be limited to the discussion of the most probable solution for each identified problem area and the associated costs. It should be emphasized here that the solutions proposed are preliminary and subject to refinement by actual final design considerations which are yet not evident. The general solution suggested, "restriction of future development, " implies the use of developmental constraints imposed by a proposed stornwater control ordinance (see Section 6.2-- following) . It is assumed that these constraints will need to be imposed in addition to the following recama-ended structural improvements in order to provide effective stormwater management at Emerald Isle. 4.3.1 ReccmTexded Solutions (1) Coast Guard Road (Near Reed Drive) . Approximately 37 acres are included in Drainage Area No. 54 which drains to a low area which is bisected by Coast Guard Road. The runoff ("C") factor for the area upon_ development is approximately 0.35 and estimated runoff quantities are based on 4.5 .inches of -rainfall per stoi.m event. The estimated storage requirement is about 210,000 cubic feet. 'This volume of stormwater can be stored along the side of the road if a portion of Coast Guard Road is raised some 18 inches. The storage , 4 - 4 ' 1 1 areas would simply consist of a swale with a series cf check dams to ' retain the water and provide adequate time for infiltration. These ' swales should be connected to North Carolina Highway 58 to provide relief when the storage areas are completely full to prevent water ' from standing on Coast Guard Road. The proposed improvements are shown on Figure 4.3.1.1. It should be noted that extreme care will ' have to be exercised during final design to prevent additional ' damage to the adjoining properties. 2 Sand Castle/Doe/Deer Born Area. This area is an interdunal trough () g ' with basically no natural discharge. Approximately 20 acres contribute stormwater indicated as Drainage Area No. 51 on map sheets 11 and 14 (see Appendix- A) . Based on. the same factors used ' in the previous problem, the stormwater storage requirement has been estimated at 113,000 cubic feet. This volume can be stored in road ' side swales and a collector ditch. The collector ditch would connect to an existing drainage system west of Conch Drive and would ' provide a method to drain the area at a slow to moderate rate. A ' careful analysis should be conducted during final design to detennine the effect on. the existing drainage system. The proposed ' improvements are shown on Figure 4.3.1.2. (3) Ocean Drive (Cedar Tree to Matt Drive) . This low area is directly behind the frontal dunes and the only outlet is by recharge to the ' groundwater. About 26 acres drain to the low area ,.,.,'.,ere Ocean Drive was constructed. Tim stonm Beater storage volume is estimated to be ' 150,000 cubic feet. The volume can be stored by raising the road ' approximately 12 inches and providing road side swales. once the 4 - 5 1 1 1 1 1 f i 1 1 1 1 1 m ±oo Soo FT. BAR SCALE 14:01:911P� DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA NEW DITCH FORCE MAIN -FM- RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN TDM STORM DRAIN PIPE + TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.1 PROPOSED , IMPROVEMENTS COAST GUARD ROAD (NEAR REED DRIVE) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORTH CAROLINA 28402 BAR SCALE i LEGEND r i DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA - 1 NEW DITCH FORCE MAIN -FM RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN -TDM- TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.2 PROPOSED IMPROVEMENTS SAND CASTLE /DOE/DEER HORN AREA HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORT14 CAROLINA 28402 1 stornwater is stored, it should be dispersed on the ocean side of ' the dunes. To accomplish this a systen including a concrete sump, portable pump, permanent forcemain and temporary dispersal mains should be provided. This system could pump the stored stormNrater ' for dispersal. within 48 to 60 hours with no adverse impact on the oceanfront. Consideration of the Town's existing equipment and, ' manpower should be included in the final design analysis to ' detennine the type of temporary equipment that best suits the Tcwn's needs. die proposed improvements are shown on Figure 4.3.1.3. ' (4) Ocean Drive (Fifth to Eighteenth Streets). This section of Ocean Drive is in the law area behind the frontal dunes and consists of about 65 acres. The stormwater storage requirement of 370,000 cubic ' feet can be met by using roadside storage swales. 'There are two low areas in the road which should be raised to facilitate access by ' emergency vehicles. To dispose of the stornwater, three (3) ' permanent concrete sumps, portable pumps, permanent forcemains and temporary dispersal mains should be provided. This system could ' pump the stored stornwater for dispersal within 48 to 72 hours with no adverse impact on the oceanfront. During final design, the ' operational sequence of the areas to be pumped should be determined. All portable pumps can probably be the same size so that they will be interchangeable between areas'L The temporary dispersal main can ' be designed to be easily moved fron one area to the next thereby reducing the overall cost of the project. The proposed improvements are shown on Figure 4.3.1.4. 4 - 6 �I 1 I f 1 1 1 1 1 1 1 1 1 I� 1 OCEAN ATLANT �C N BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA - NEW DITCH FORCE MAIN -FM RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN -TDM- TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.3 PROPOSED IMPROVEMENTS OCEAN DRIVE ( CEDAR TREE TO MATT DR.) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORTIi CAROLINA 26402 BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA - NEW DITCH FORCE MAIN -FM RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN -TDM- TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.3 PROPOSED IMPROVEMENTS OCEAN DRIVE ( CEDAR TREE TO MATT DR.) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORTIi CAROLINA 26402 1 I 1 1 1 1 1 1 1 ATLANTIC _ OCEAN .00 o mo _ too moo .BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA NEW DITCH " FORCE MAIN ---FM RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN —TDM— TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA w cn FIGURE 4.3.1.4 z PROPOSED IMPROVEMENTS J = OCEAN DRIVE (5TH. TO 18 TH. STREETS) V F- Q HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORT14 CAROLINA 28402 (5) Sand Castle (Pinewood to Sea Dunes). This drainage area consists of ' -over 10 acres which all drains to and ponds the road. This area generates apprcccimately 57,000 cubic feet of stornwater. which needs to be stored and removed fran the road area. By constructing road ' side storage areas this flaw can be stored allowing travel on the road. 9be storage areas should be connected to an existing drainage ' area west of this area. A careful review of the affect of the ' additional stoxirwater on the existing system should be conducted during the final design process. Refer to Figure 4.3.1.5 for the ' proposed inpivvements • (6) Sound Drive (Hogue Inlet to Live Oak). This 18.6 acre tract drains ' to four (4) low areas with 6.4 acres draining to a low area which ' encarpasses Sound Drive. This 6.4 acre area of mainly undeveloped real estate generates approximately 36,300 cubic feet of stornwater ' in a 24 hour period. This volume can be stored in road side swales allowing for infiltration and use of the road by vehicles. However, ' additional development is only going to aggravate the current ' situation. Therefore, individual property owners should be required to install devices and systems which will reduce the impact on the stormwater in this area. The.proposedimprovements are shown on Figure 4.3.1.6. ' (7) Reed Drive (At Bayberry). This area is only a portion of a much ' larger area with an existing drainage system. The area is composed of numerous small low interdunal trough areas. A storage volume of ' 50,000 cubic feet can be handled with road side storage and connection to the existing drainage system. The existing drainage 4-7 0 ..BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA - NEW DITCH FORCE MAIN -FM RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN -TDM- . TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.5 PROPOSED IMPROVEMENTS SAND CASTLE (PI NEWOOD TO SEA DUNES) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORT1 CAROLINA 28402 I 1 1 1 1 1 1 1 1 1 1 1 1 1 sooNo ea��E a N • t 1 • i f } • I i t . i ao o m +^o 00 t ....BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA — NEW DITCH FORCE MAIN — FM RAISE EXIST. ROAD ' TEMPORARY DISPERSAL MAIN —TDM— TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.6 PROPOSED IMPROVEMENTS SOUND DRIVE(BOGUE INLET TO LIVE OAK) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS & PLANNERS WILMINGTON, NORT14 CAROLINA 28402 system will eventually drain out the area, however, a detailed ' analysis during final design will help determine the effect of the ' additional stormwater.. Refer to Figure 4.3.1.7 for the proposed iaprovements. (8) Coast Guard Road (Island Circle) . The Town recently completed a road side ditch on both sides of Island Circle and on the east side ' of Coast Guard Road in the area. The ditch flows to an existing low area north of the project area. This project consists of additional stormwater swales and ditches. The proposed ditch locations are ,- shown ca Figure 4.3.1.8. 4.3.2 Preliminary Cost Estimates ' The following preliminary cost estimates have been prepared for the eight ' (8) problem areas previously discussed. Several of the solutions for the problem areas may require easement acquisition. The costs associated with the easements have not been included in these estimates due to uncertainties regarding actual locations. Actual easement requirements should be determined during final design. (1) Coast Guard Road (Near Reed Drive) ' Road side storage swales $ 43,300 Road improvements 67,900 Grassing 4,400 ' Storm drain pipe 3,000 Construction Subtotal $118,600 Contingency 23,700 ' Technical Services 20,000 Total Project Cost $162,300 4 - 8 �R\�6 EMEE ALA N goo o m no :o BAR SCALE LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA — NEW DITCH FORCE MAIN —FM I RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN —TDM— TOWN OF EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE . 4.3.1.7 PROPOSED IMPROVEMENTS REED DRIVE (AT BAY BERRY) HENRY VON OESEN & ASSOCIATES'' CONSULTING ENGINEERS & PLANNERS ! WILMINGTON, NORTFI CAROLINA 28402 i e f rtj 1 6 t 1. O ....BAR SCALE t LEGEND DRAINAGE BASIN LIMIT ROAD SIDE STORAGE AREA - NEW DITCH FORCE MAIN -FM- RAISE EXIST. ROAD TEMPORARY DISPERSAL MAIN -TDM- TOWN & EMERALD ISLE CARTERET COUNTY, NORTH CAROLINA FIGURE 4.3.1.8 PROPOSED IMPROVEMENTS COAST GUARD ROAD (ISLAND CIRCLE) HENRY VON OESEN & ASSOCIATES CONSULTING ENGINEERS A PLANNERS WILMINGTON, NORT14 CAROLINA 28402 (2) Sand Castle/Doe/Deer Horn Area Road side storage swales $ 28,000 Collector ditch 14,400 Grassing 3,000 Storm drain pipe 2,400 Construction Subtotal $ 47,800 Contingency 9,600 ' Technical Services 8,200 Total Project Cost $ 65,600 ' (3) Ocean Drive (cedar Tree to Matt Drive) Road side storage swales Road improvements $ 40,000 85,200 Grassing 3,000 Storm drain pipe 12,600 Concrete sump 20,000 Forcemain 3,600 Temporary dispersal main 12,000 ' Portable pump/trailer 10,000 Construction Subtotal $186,400 Contingency 37,300 Technical Services 35,000 Total Project Cost $258,700 ' (4). Ocean Drive (Fifth to Eighteenth Streets) -Road side storage swales $137,000 Road improvements 65,600 Grassing 10,500 Storm drain pipe 49,900 Concrete sumps (3) 60,000 Forceimin 5,400 Temporary dispersal main 30,000 Portable pump/trailer 10,000 ' Construction Subtotal $368,400 Contingency 73,600 ' Technical Services 62,000 ' Total Project Cost $504,000 4 - 9 (5) Sand Castle (Pinewood to -Sea Dunes) Road side storage swales $ 21,100 ' Collector ditch 1,600 Grassing 1,500 Stone drain pipe 1,800 Construction Subtotal $ 26,000 Contingency 5,200 Technical Services 4,800 ' Total Project Cost $ 36,000 (6) Sound Drive (Bogue Inlet to Live Oak) ' Road side storage swales $ 20,700 Grassing 1,500 ' Storm drain pipe 1,800 Construction Subtotal $ 24,000 ' Contingency 4,800 Technical Services 4,500 ' Total Project Cost $ 33,300 ' (7) Reed Drive (at Bayberry) Road side storage swales $ 18,500 Grassing 1,500 ' Storm drain pipe 6,200 Construction Subtotal $ 26,200 Contingency 5,200 Technical Services 4,800 Total Project Cost $ 36,200 ' (8) Coast Girard Road (Island Ci.rcle) Road side storage swales $ 13,200 ' Collector ditch 22,400 Grassing 3,000 Storm drain pipe 1,200 ' Construction Subtotal $ 39,800 ' 4 - 10 i 1 1 1 1 1 1 Contingency 81000 Technical Services 7,000 Total Project Cost $ 54,800 GRAM 'Ia AL ES LnIl%TED OJST ALL EIGiT PROJECTS $1,150, 900 C4 n 4.3.3 Maintenance of Drainage Systems n C7 The drainage improvements recatmerraed herein will need to be maintained by the Town. Periodically, sand deposits will have to be removed fran swales, drainage pipes and pump sumps to insure optimal operation of these systems. In addition, the portable pumps will need to be maintained and stored in a state of readiness for use after heavy rains. Provisions need to be made in annual budgets for such costs. Drainage systems on private property must also be maintained. The proposed stornwater control ordinance presented hereinafter (see Section 6 and Appendix D:) accounts for this need in the form of an enforceable provision. 4 - 11 ' SECTION 5: -PROJECT IMPLEMENTATION 5.1 fleMs-4-1 ' The major drainage, problems, their recommended solutions and their estimated (preliminary) costs have been identified in the iprevious section. The projects have been prioritized. How to implement and fund the corrective actions are discussed in this ' section. 5.2 P14.7�.�b�s.U1Ag ' Each project should be implemented in order of priority as ' set forth in Section 4 above. Drainage projects are inherently expensive and so it would be prudent to schedule only one to two ' or perhaps at the most three projects each fiscal year for design/construction until all eight (8) of the major problems are ' rectified. Because of the level of importance and the cost of ' the highest priority project, it may be best to proceed with it as the initial project in the series as a "test case" for ' implementation. ' 5 .3 .Prig g-t— Zan-d i g ' At present, there are no applicable active state or federal grant programs that would provide matching funds for the ' construction of drainage projects at Emerald Isle. Thus, all projects must be accomplished with local funds. One traditional ' source of such local funds would be General Fund Revenues supported by Ad Valorem taxes. This procedure would distribute 1 5 1 the cost of drainage improvements to all of the property owners ' at Emerald Isle. However, not all property owners would receive direct benefits from the identified improvements and so it could ' -possibly be argued that such a system would be "unfair". Hence, in the interest of fairness and equitability, the ' basic premise in funding drainage improvements projects is that "those who benefit share in the cost." Consistent with this general premise is the funding tool of special assessments which ' are defined in detail in Article 10 of the General Statutes ' Section 160A-216 through 238. A special assessment program appears to be the most equitable means to fund the eight (8) , identified major drainage projects defined above. According to the General Statutes, assessments may be made on , the basis of: , (1) The frontage abutting on the project, at an equal rate per foot of frontage (front foot assessment) ; or , _(2) - The area of land served, or subject to being served, by the project, at an equal rate per unit of area (areal , assessment); or (3) The value added to the land served by the project, or subject to.being served by it, being the --difference , between the appraised value of the land without. improvements as shown on the tax records of the county, ' and the appraised value of the land. with improvements ' according to the appraisal standards and rules adopted by the county at its last revaluation, at an equal rate ' per dollar of value added (value added assessment); or 5 - 2 ' (4) The number of lots servedr or subject to being servedo, where the project involves extension of an existing system to a residential or commercial subdivision,'at an equal rate per lot (lot assessment); or (5) A combination of two or more of these bases. In cases where areal or value added assessments are selected, ' the unit of government may provide for the laying out of benefit zones according to the distance of benefited property f r om the project being undertaken, and may establish differing rates of assessment to apply uniformly throughout each benefit zone. This ' provision appears to have merit in the case of Emerald Isle as ' those properties immediately adjacent to a drainage structure or improvement may benefit more than those further remote from it. ' In any case, the General Statutes indicate that the unit of government should endeavor to establish an assessment method from among the alternative bases set out which will most accurately ' assess each lot or parcel of land according to the benefit conferred upon it by the project. The local unit of government's ' decision as to the method of assessment will be final and conclusive and not subject to further review or challenge.. The General Statutes also set forth the procedures in levying ' assessments which is summarized in order of occurrence as f of l ow s : •-: 4p _���1�� l v nA which defines the scope of the project, basis for assessments, boundaries of the area to be assessed, estimated cost of the project and the portion 5 - 3 to be paid by assessmentso, terms of paymentr and the 'date ' of a public hearing. etc'. • P1ib�����9D�4�_� �4���� .Q.€_��� P.�S'�.l��A�.iy_B.��4�S71��4I1 ' • �41i�1d�� .P1��.i.� B�.�t�D�4�.�.b� Ps��.�IniD�xY_.R.s�4�.��.�i� ' • A�7�P.� .F�ii��_R��4�1a�t�41� • �4A��d�� P.fd�?��� $��.I�Il�4� 1'Y��,�IP�D�3Y_A�.�.�����A� .�Q.�.�. ' • B�Y.���L�QDISL�_Bs���L��11 R4�.� (upon confirmation assess— ' ment becomes a lien on all the property assessed). • 1'111?�����4�.Qf_r%����_4� �QD,�4S�.���4A.4�_P�S������At_�4�� ' • �4�.� e���4A.4� ��g��LngD�� In view of the nature of the drainage projects at Emerald ' Isle. it would appear that the areal assessment basis coupled with the designation of benefit zones best fits the situation. Thus this funding approach is -recommended in this case. SECTION 6: LOCAL REGULATORY CONTROL STRATEGIES. 6.1 Previous sections of this report have identified the major existing drainage problems and cost effective, environmentally sound engineered solutions have been proposed. An implementation plan and funding arrangements have been identified. The focus in this section is how best to prevent, insofar as possible, the creation of future drainage problems. An effective control strategy is identified and presented along with a suggested legal mechanism of enforcement in the form of a local stormwater control ordinance. 6.2����Y_QS_ The purpose of any control strategy relative to stormwater and drainage is to prevent insofar as possible the creation of additional drainage problems due to imprudent development. As indicated in Section 1 above, the Town of Emerald Isle is currently about 51 percent developed. Therefore► it is imperative that an effective and enforceable control strategy be developed as soon as possible to advance the Town into a posture of enlightened prevention instead of that of belated reactions to problems created by a lack of understanding of the drainage situation at Emerald- Is.l e. _ The key issue of any control strategy revolves around the fact that the unique interdunal trough groundwater recharge areas identified on the topographic maps must be preserved in an F�4 unaltered state wherever possible. If these areas must be I disturbed or altered to permit development, some alternative engineered provision must be made to accommodate or balance out their loss from the total system. In cases where large undeveloped tracts contain identified interdunal trough recharge areas, they should be preserved as conservation/groundwater recharge areas. Developers can be given credit for the designation of such areas as part of their overall greenspace requirements. In essence, developers should be encouraged orr if possible, required to develop around the interdunal trough recharge areas rather than over them. This is simply working with the environment instead of against it. In some cases it may be necessary to enhance the drainage capabilities of the- interdunal troughs by the selective removal of accumulated organic materials which may prevent rapid recharge of stormwater to the surficial sand aquifer. However, such modifications -should only be allowed following appropriate analyses of soil borings and an assessment of the local hydrogeology of the system. Any control ordinance should encourage the application of infiltration systems such as swales, dutch drains, french drains, dry wells, etc. to diminish stormwater quantities prior to ultimate discharge to the interdunal trough recharge areas. In the cases where small individually platted but as yet undeveloped lots are covered in whole or in large measure by interdunal trough recharge areas, a dilemma arises in classifying such areas as conservation areas. In such cases, development of 6 - 2 L that lot could be precluded by regulation. Thus, to prevent or preclude possible legal challenges of a local stormwater control ordinance which precludes development of all interdunal trough recharge areas, some variance_ mechanism must be included as a "safety valve" for such circumstances. Thus, if an interdunal trough recharge area must be altered or filled to permit the development of an individual lot, alternate provisions need to be made to handle stormwater so as not to exacerbate drainage problems on adjacent tracts of land. Possible solutions to the problem are: • Exemptions for minimal alterations of interdunal troughs on single residential lots. • Construction of stormwater retention basins where site space exists for same." • Use of supplemental infiltration sumps or ditches to replace the interdunal trough functions. • Pumping or gravity diversion of stormwater to an adjacent interdunal trough recharge area or to a frontal dune infiltration system. • Use of porous pavement. • Combination of one or more of the above techniques. 6.3 Draft Stormwater Control Ordinance Several existing stormwater control ordinances were reviewed relative to the Emerald Isle situation. None were found to be directly applicable. However, certain elements from several are considered applicable. Provisions from several model ordinances 6 - 3 were used to formulate the basic outline of a suggested ordinance ' for Emerald isle which is found in Appendix D.. Major points include: ' • Consistency with the existing State Coastal Area Stormwater Control Regulations relative to the need for permits, --emphasis on the use of infiltration systems, applicability ' of the 2-year design storm, etc. Requirement of submittal of a stormwater control plan for the development of all sites exclusive of single ' residential lots or for single residential lots -which involve any filling or alteration of interdunal troughs. , • Designation of all interdunal trough recharge areas in parcels exceeding one acre as conservation zones. ' Developers must make all prudent efforts to prevent ' pr.e-emption of such areas for stormwater control or to provide engineered alternatives. ' • Recognition of appropriate engineered alternatives for stormwater control for single residential lots with interdunal troughs to allow for development of such lots. ' • Application of minimum stormwater control standards for all development. All development must provide infiltration ' systems to control runoff from 1.5 inches of rainfall or less. ' e, No direct stormwater discharges to Bogue SounO , Archers ' Creek or to the Atlantic Ocean. 6 4 ' The Stormwater Control Ordinance procedures also include the development of a permit fee schedule based upon the relative ' complexity of the project and the 'need to formulate a Manual of ' Stormwater Management Practices. This latter document will provide developers with practical guidance in 'designing and ' operating drainage systems consistent with the intent of. the ordinance. The manual should contain basic design standards and ' specifications for infiltration basins and trenches, dry wells, ' porous asphalt pavement, vegetated swales with or without check, dams, holding ponds, vegetative filter strips, etc. The ' following reference publications developed by the Maryland ' Department of Natural Resources should be especially useful in this regard: ' • Maryland Standards and Specifications for Stormwater Management Infiltration Practices (February, 1984). ' Maryland DNR, Annapolis, MD. • Inspector's Guidelines Manual for Stormwater Management Inf iltration Practices (December, 1985). Maryland DNR, ' Annapolis, MD. Adoption of a final version of the suggested stormwater ' control ordinance should follow traditional procedures for the ' development and approval of local ordinances including ample opportunities for public input and comment and appropriate legal ' reviews prior to final promulgation. A proposed schedule for implementation follows: 6 - 5 Action Completion Date • State adopts new Stormwater Control Regulations January 1, 1988 • Complete draft of Public Comment Version of local Stormwater Control Ordinance March 31, 1988 • Public review of draft ordinance (30 day period) • Conduct public hearing on draft ordinance May 31, 1988 • Revise draft ordinance to incorporate results of public input June 15, 1988 • Complete legal reviews of final version of ordinance June 30, 1988 • Adopt ordinance July 15, 1988 ' SECTION 7: SUMMARY, CONCLUSIONS AND RECOMMENDATIONS ' 7.1 Summary and Conclusions ' Severe flooding due to heavy rains in November, 1985 prompted the Town of Emerald Isle, NC to engage the services of Henry von Oesen and Associates, Inc., Consulting Engineers and Planners, to ' prepare a Drainage Master Plan. The resultant plan is based on a set of fifty (50) aerial topographic maps at a scale of 1" = 100 ' feet with .contour intervals of two (2) feet which were produced by Landmark Engineering, Inc. of Cary, NC. The maps, reduced ' versions of which accompany this report (see Appendix A), show ' all existing drainage structures, the boundaries of some 191 drainage subbasins, the locations of eight (8) major drainage ' problem areas and the locations of unique in terdunal trough groundwater recharge areas. These latter geographic features ' constitute the major natural drainage "outlets" at Emerald Isle and, therefore, deserve special protective measures. The Town of Emerald Isle has been supplied the original 1 mylars of these topographic maps for its use in future planning activities. Officials, staff persons, developers, architects, ' engineers and private citizens will find these maps extremely ' useful in planning projects at Emerald Isle. Henceforth all future projects should show sensitivity to the need to preserve ' interdunal trough groundwater recharge areas. For the eight (8) major drainage problem areas identified in ' Section 4 of this report, appropriate solutions are proposed and preliminary cost estimates are presented. The total ' 7 - 1 (preliminary) cost of design/construction of all eight projects is estimated at $1,150,900 exclusive of easements. Each of the projects has-been assigned a priority based on the criteria of public safety; property damage potential, impact on receiving waters and public nuisance factors. It is proposed that -the projects be funded by a program of areal assessments coupled with the designation of benefit zones as detailed in Section 5 of the report. This funding program is designed to equitably assess -benefited property owners for the cost of drainage improvements. Also included in the Drainage Master Plan is the basic framework for a local regulatory strategy for stormwater control to prevent, insofar as realistically possible, future drainage problems caused by inappropriate or imprudent development actions. The basis for the control strategy is a local stormwater control ordinance which will require the submittal of a stormwater management plan for each major development which disturbs more than one (1) contiguous acre of land or for single residential lots which contain interdunal troughs. The ordinance is also designed to prevent destruction of the interdunal trough groundwater recharge areas associated with major development tracts and to mitigate their destruction in conjunction with development of single family lots. All development will be required to meet minimum infiltration system requirements. Required stormwater control techniques presented in the ordinance are based on and are in harmony with State Coastal Area Stormwater Regulations promulgated by the N. C. Division of Environmental Management's Environmental Management Commission. 7 - 2 1 A suggested schedule for the formulation,. review, public comment on and adoption of the local stormwater control ordinance is provided. According to the suggested schedule, the ordinance should.be adopted by mid -July 1988. 7.2 Recommendations The following recommendations are offered for consideration: • In order to prevent a recurrence of the severe drainage problems which became manifest in November, 1985, the Town of Emerald Isle should immediately begin a progressive rprogram of drainage improvements in the eight (8) problem areas defined in this report. 1 • The highest priority project located at Coast Guard Road at ' Reed Drive should be designed and constructed first. This project should be expedited in view of the severity of need. • The -drainage projects should be funded by a program of areal assessments coupled with the designation of benefit zones so as to equitably distribute project costs amongst benefited property owners. • Concurrent with the design and construction of the drainage improvements in the identified problem areas, the Town should proceed to adopt a local stormwater control ordinance with the following basic features: a. Conservation and protection of the interdunal trough ' groundwater recharge areas wherever possible. b. Imposition of minimum infiltration system standards for all development. c. Requirement for submittal of a stormwater management plan for the development of all new sites which exceed one (1) contiguous acre and for the development of all' single residential lots which involve the alteration of interdunal troughs. d. Prohibition of any direct stormwater discharges to Bogue Sound, Archers Creek or to the Atlantic Ocean. e. Recognition of appropriate/approvable engineered alternatives to absolute conservation of interdunal trough recharge areas in cases of single family lot development. f. Consistency with the State's Coastal Area Stormwater Regulations relative to design criteria for infiltration systems, allowable percentages of impermeable surfaces, stormwater holding ponds, design storms, etc. The firm of Henry von Oesen and Associates, Inc. stands ready to assist the Town of Emerald Isle to implement the above recommendations. Respectfully submitted, HENRY VON OESEN AND ASSOCIATE , INC. William E. Burnett Environmental Planner David E. Criser, P. E. Project Engineer olot%;2U4#:.I,C.tl SEAL 11270 . 1 a ^i ��i � �,°�: ; �o.;+`°•' � .yam•• 7 - 4 "�9J,/D E. C�Sa 6°0 QJJJJJJiEl�9�5` 1 I 1 A B C D APPENDICES TOPOGRAPHIC MAPS OF EMERALD ISLE CLIMATIC SUMMARY EXISTING COASTAL AREA STORMWATER CONTROL REGULATIONS MODEL STORMWATER CONTROL ORDINANCE FOR EMERALD ISLE, NORTH CAROLINA APPENDIX A TOPOGRAPHIC MAPS OF EMERALD ISLE N GENERAL NOTES 1. MAP COMPILED BY STEREOPHOTOGRAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GRID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SYSTEMS SOU IN ZONE 1927 M.A. DATUM VERTICAL DATUM 1929 G.A. 3. CONTOURS ARE SUFERIMPCSEO CN AN ORTNOPHOTO BASE. A. TOPOGRAPHIC MAP PREPARED SY LANDMARK ENGINEERING COMPANY INC. P.O. 60R $68 LARY. N.C. PROJECT NO. 06170 PHOTOGRAPHY DATE; MARCH.1966 SCALE; 1 I— • 100 IRRI 100 0 100 200 56i300 CONTOUR INTERVAL-2 FOOT LEGEND Us HIGHWAY BRIDGE I--� INTERSTATE HIGHWAY r / SWAMP N.C. STATE HIGHWAY 16>INDfY CONTOUR SECONDARY ROAD SR 1523 INi ERMEDIATE CONTOUR �_— STREAMS• & 6HORE—E - APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR�i SPDT- ELEVATION w 16.6 NEW CATCH BASUN/INLET - DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BAAIII—LET _ ONAINAGE SUB -BASIN LIMIT—G—G— NEW MANHOLE NEW STORM OR.IN LINE EXIST. MANHOLE =z�= EXIST STOIIMDNAIN LINE === DEPNESSON/RECHMRGEAREA C a H U f Q - THE PPE—TICN Of THIS MAP WAS FINANCE] IN PART THROUGH A GA.T PRDADED BY THE NORTH CiROLINA COASTAL MANAGEMENT PROGRAM , THP-JUGH `ND PROV10E0 By THE COASTAL ZONE MANAGEMENT ACT OF 922, AS :HIC .ME.NCEO. WHICH IS AOMINISTERED BY THE OFFICE OF OCEAN AND C:ASSL RESOURCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMWISTP6TON. T 2,57!,000 L2 _W,000 E 2.575.000 N GENERAL NOTES 1. MAP COMPILED BY STEREOPNOTOGRAMHETRIC METHODS IN ACCORDANCE WIT" NATIONAL MAP ACCURACY STANOINDS. 2. GRID BASED ON NORTH CAROL NA STATE PLAN COORONYTE SYSTEM: SOUTH SOME 1927 N.A DATUM VERTICAL DATUM 1929 G.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTNOPHOTO BASE. A. TOPOGRAPHIC MAP PREPARED BY LANDMARK ENGINEERING COMPANY INC. P.O. BOX $68 CARY, M.C. PROJECT NO. 06170. PHOTOGRAPHY DATE: MARCN,19B6 SCALE: I INBN • 100 /tit .00 0 100 200 300 CONTOUR INTERVAL-2 FOOT LEGEND U S "IGNWAY +bYl BRIDGE �� INTERSTATE HIGHWAY p SWAMP N.C. STATE HIC-HWAY <91 INOEY CONTOUR SECONDARY ROAD SH 1523 INTERMEDIATE CONTOUR STREAMS B SNORE LINE _ APPROXIMATE CONTOUR TOWN LIMIt -- -- DEPRESSION CONTOUR -i SPOT ELEVATION A 16.8 NEW CATCH BASIWINLET >e DRAINAGE BASIN LIMIT —A EYIST. CATCH BASIN/INLET DRAINAGE SUB-BASN LIMIT —A—.— .,IT, MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM CHAIN LINE � = _= OEPR MICH/RECHARGE AREA C 2 N S U Q TI-E RE%sRATX,N OF THIS MAP WAS F—%CE] N FAFT—a H A G;ANT Sx TnE NORTH CAROLINA CGAS TAL MANAGEMENT F9CG.FAM , HFCJSn FJNDS PNOVICE] BY THE COASTAL ZGNE MANAGEVE'.T ACT OF $72, a5 Avi ICED, WMCH IS AONINISTERE] BY THE OFF,CE OF GCEA.N AND C;AST.Al RESOURCE MANAGEMENT, NATIONAL OCEANIC AND ATNOSFHEPIC ADMINISTRATION. MATCH SHT. 3 E 2,'73,000 NO M E 2,f w.L0O E 2,675,000 N GENERAL NOTES I. MAP COMPILED ST STEREOPNOTOGRAWETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANOAROS, 2, cmo "'CC ON NORTH CAROL IN. STATE PLAN COORDINATESYSTEY: SOOT. Zo.t 1921 IN . DATUM VERTICAL DATUM 1929 O.A. 3. CONTOURS ARE SUPERIMPOSED ON AN ORTMOPHOTO BASE. 4. TOPOGRAPHIC INP PREPARED BY LANDMARK ENGINEERING COMPA MY INC. P0. BOX 6S6 CARY. N.C. PROVECT NO. 66170. PNOTOORAPMY DOTE: MARCH,1946 SCALE 1 1ns0 • 100 MH I 0 XM 200 300 CONTOUR 1MTEAVAL-2 FOOT LEGEND u S HIGHWAY 8 BRIDGE r—If INTERSTATE HIGHWAY p SWAMP c INDEX conT �I x. sidTE , xlGxwdr Q .;ua .-cEE�� ^ � � � , � - 4. / ,.Yy°� � �"�• � � �'H "' ((G...���JJJ��(((�R ,•X6''. } y �F� SELONDdRY ROAD SR 1323 Ix TERME DIATE CONTOUR��-_Z • /� _ .yl s t �t ..v .' S k n/6� . - STREAMS APPROXIMATE CONTOUR i ' • �, ��,� L �' y �1E t_r, 4� � � :•: TOWN LIMIT ---- DEPRESSION CONTOUR "�!•�y �� ���,yj •[ SPOT ELEVATION A 16.8 NEW CATCH SASIWMLET v�{� T,F ��{•� � . - - �-� `�•.•� _��/r�v 'f�sj ��r���Nr� � � DRdINAGE 6d$iN LIMIT —R— � EXIST CATCH BASIN/INLET DRAINAGE $UB-B44M LIMIT NEW MANHOLE �— �!T+ • fd]a, y `{! /1 .' NEW STORM DRAIN LINE EXIST_ MANHOLE +--�— A �I _ I�J��Ka T_.• T, .A ��� I� � U•- EXIST. STORY DRAIN LINE — -- DEPR6510WflEC1uR6EMEAC N H 2 V H Q Z 'FE PBY TH iXN OF THIS MOP WAS FINANCED IN ?ART THROUGH A GRANT PF GC GH BY THE NORTH By TIE HA COASTAL NE VA VE`I PROGRAM 0 , ,. - VEH FUNDH PFO5 ACM BY THE COASTAL ZONE MANAXEINf N. CF 9AL AE A.VEYCEO, WHICH E. ACMINIiONAL E THE D CE c pCEAN ANO C'nl5idl FESCURCE MANAGEMENT, NATIONAL OCEANIC AND ATMCSPNERIC KMINISTRATICN. A GENERAL NOTES I. MAP COMPILED BY STEREOPHOTOGAAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GRID BASER ON WAIN CAROLINA STATE PLAN COORDINATE SYSTEM: SOUTH ZONE 1927 N.A. DATUM VERTICAL DATUM 1929 G.A. 3. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. ♦. TOPOGRAPHIC MAP PREPARED BY LANDMARK ENGINEERING COMPANY INC. 10. BOX 668 CAPT. KC. PROJECT NO. 661T0. PNOTOGRAPMY DAT[: MARCH,1966 SCALE+ 1 inch • 100 IXXI 100 0 IDO 200 3 o CONTOUR INTERVAL-2 F00T LEGEND U S. HIGHWAY ESQ BRIDGE t1 . INTERSTATE HICHWAY po SWAMP , • _ N.C. STATE MICHWAY Q INDEX CONTOUR _All SECONDARY ROAD SR 1523 INTEF MEDIATE CONTOUR ��� STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION F 16.8 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BASIN/INLET �­0�_ DRAINAGE SUB -BASIN LIMIT —y—A— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE -- -- DEPRESSION/RECHARGEAREA C� E PFEPAR . OF THIS MAP WAS FINANCE] IN PART TI:PO.GH A GRANT PNC,ACE] Ev THE NORTH CAAOLINA COASTAL MANAGE'AENT PROGRAM, THROUGH FUNDS PROVIDED BY THE COASTAL ZONE MAN ACEVENT ACT OF 1972. AS AMENCEO. WHICH IS AOMINISTERE3 BY THE OFFICE OF U-AN AND =AS'AL REE:,UR^_E MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION. [ 2,5,5.000 E 2.576.000 N GENERAL NOTES I. MAP COMPILED BY STEREOPHOTOGRAAMETR IC METHODS IN ACCORDANCE WITH NATIONAL MAP ACC URACT STANDARDS. 2. GRID BASED ON NORTH CAROLINA STATE PLAN COORO.-TE SYSTEM. 50U TH ZONE 192T NA. DATUM VERTICAL DATUM .929 D.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO USE. R. TOPOGRAPHIC MAP PREPARED BY LANDMARK ENGINEERING COMPANY INC. R0. BOX $68 CAPT. M.C. PRO.IECT NO $61T0. PHOTOGRAPHY DATE; MARCH,1986 SCALE+ 1 ill' • 100 NM 100 0 100 200 !00 CONTOUR INTERVAL-2 FOOT LEGEND u. s. HIGHWAY ISRt BRIDGE INTERSTATE HIGHWAY WW SWAMP .. • . N. C STATE HIGHWAY Q INDEX CONTOUR SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR STREAMS 6 SVORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR�� SPOT ELEVATION A I6.B NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BASIN/.LET DRAINAGE SUB-BASN LIMIT—e—G— NEW MANHOLE ®!_� NFW STORM DRAIN LINE EXIST. MANHOLE �- EX IST. STORM DRAIN LINE �= _= DEPRESSION/RE"FIGEAREA C THE PREPARAT. OF TH.S VAP WAS FNANCED :N PART THRCLOH A GRANT PROADED BY THE NORTH aAACLINA COASTAL I—:GE`AEVT PROGRAN , THROUGH FUNDS PROVICEO BY THE COASTAL ZONE MANAGEN£VT ACT OF 972, AS FMENDED, cared 15 ACMMISTERE] BY THE OFFICE CI` OCEAN AND COASTAL NEST URCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, MATCH SHT. 6 I I P r N GENERAL NOTES 1. MAP COMPILED BY STEREOPHOTOGRAMNIETRIC METHODS IN ACCORDANCE WITH NATIONAL YAP ACCURACY STANDARDS. 2. GID BASED ON NORTH CAAOLINR STATE PLAN COORDINATE SYSTEM: SOUTH ZONE 1927 N.A DATUM VERTICAL DATUM 1929 9.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. R. TOPOGRAPHIC AMP PREPARED BY LANDMARK ENGINEERING COMPANY INC. P.O. BOX $68 CART. N.C. PROJECT NO. SGITO. PHOTOGRAPHY DAYS: MARCH, 1906 SCALE, I iAAN A 100 1011 100 O 100 —300 _ ]00 CONTOUR INTERVAL-2 FOOT LEGEND U.S. HIGHWAY IRS, BRIDGE INTERSTATE HIGHWAY R / BWAMP N.C. STATE HIGHWAY Q INDC% CONTOUfl SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR STREAMS B SHORELINE _ "'J ARPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION % 16.6 NEW CATCH BASIN/INLET - DRAINAGE BASIN LIMIT —A—A— EXIST CATCH BASIN/INLET -= DRAINAGE SUB -BASIN LIMIT — G —A— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE _.na EXIST. STORM GRAIN LINE _ === DEPRESSION/RECHARGE AREA THE PNEPARATICN Of THIS MAP WAS FINANCED IN PART THROUGH A GRANT PRWIDEO BY THE NORTH CAROLINA COASTAL MANAGEMENT PROGRAM , THRWGN "NDW S PRICEO BY THE COASTAL ZONE MANAGEMENT ACT OF gTZ. AS AME.%CEO. WHICH IS AWINISTERED BY THE OFFICE OF OCEAN AND COASTAL RESOURCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC AWNLRTflATION. 1 1 1 1 1 1 1 1 1 1 1 1 Q f S V a N GENERAL NOTES I. MAP COMPILED BY STEREOPMOTOGRAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GRID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SYST E M� 30U TH ZONE 192? N.A. DATUM VERTICAL DATUM $929 B.A. 3. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. A. TOPOGRAPHIC MAP PREPARED BV LANDMARK ENGINEERING COMPANY INC. P.O. BOX 66B CAR,' M.C. PRO/ECT NO. B61T0. PHOTOGRAPHY DATE: MARCH, 4996 SCALE: I inch • 100 hM .00 0 XXl 200 3-0 CONTOUR INTERVAL-2 FOOT LEGEND U S. HIGHWAY 1<9 BRIDGE r-1 INTERSTATE HIGHWAY p / SWAMP , . 1. N.C. STATE HICHWAY O INDEX CONTOUR SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION X 16.8 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT - • -A- EXIST. CATCH BASIN/INLET DRAINAGE SUS-BASW LIMIT - A -A- NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE �= _= DEPRESSION/RECHARGE AREA c J THE PREPARA'CN CF THIS MAP WAS FINANCED IN PART THROWN A GRANT PRL`/ILEJ By THE CAROLINA COASTAL MANAGEMENT PRO GFAM , THPWGH FJNDS RRCv:C E] BY THE COASTAL ZONE MANAGEMENT ACT OF 1972, AS AMENCEO. WHICH '.S MINISTERED BY THE OFFICE OF OCZ- AND COASTAL F E5x1RCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC AZMINISTRATION. 180 ILI' b�,c MATCH SHT. 9 E 2,5BO.00O E N GENERAL NOTES I. AV COMPILED BY S NATIONAL METHODS IN ACCORDANCE WNATI ITH ONAL P ACCURACY STANDARDS. 2. GRID BASED ON NORTH CAROLINA STATE PLAN COORDINATESYSTEM: SOUTH ZONE $927 NA, DATUM VERTICAL DATUM 1229 G.A. 3. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. A. TOPOGRAPHIC MAP PREPARED BY LANDMARK ENGINEERING COMPANY INC. P.O. 60X 666 CARY. N.C. PROJECT N0. 4 61T0. PHOTOGRAPHY DATE MARCH,1956 SCALE: 1 incA • .00 !!RI 100 0 100 200 300 CONTOUR INTERVAL-2 FOOT LEGEND U.S. HIGHWAY L3 BRIDGE �Y INTERSTATE HIGHWAY ® SWAMP N.C. STATE HIGHWAY Q INDEX CONTOUR SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT --� DEPRESSION CONTOUR �> SPOT ELEVATION F 16.8 NEW CATCH BASIN/INLET — DRAINAGE BASIN LIMIT —A—A— EXIST CATCH BASIN/INLET ORAINAGE $US —BASIN LIMIT —A—A— NEW MANHOLE —1— NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE =—_= DEPRESSION/RECHARGEAREAC :�_) THE PREPARATCN OF THIS MAP WAS FINANCED IN PART THROUGH A GRANT PROV'OEO EY THE NORTH C.ROLINA COASTAL MANAGEMENT PROGRAM , THROUGH F;NCS PROVIDED BY THE COASTAL ZONE MANAGEMENT ACT OF 572, AS AMENCEO, WHICH IS AOMIN15TERED BY THE OFFICE OF OCEAN AND COSTAL RESOURCE MANAGE—, NATIONAL OCEANIC AND ATMOSPHERIC AOMWISTeL'T:CN. E 2.STA000 RX ♦' r T A .y MATCH SHT 8 E2,6TS,000 06 rcr-3• • T t � f Zo tl Sri J >• � t T f �=6 F' pS 3t t 1 T N GENERAL NOTES 1. - COMPILED BY STEREOINOTOG.ANMET.IC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GRID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SYSTEM' SOUTH ZONE 1927 M.A. DATUM VERTICAL DATUM 1929 i S. CONTOURS ARE SUPERIMPOSED ON AN ORTMOPNOTO USE. A. TOPOGRAPHIC MAP PREPARED BY LANOMARN ENGINEERING COMPANY INC. RQ BOX 666 CARY. N.C. PROJECT NO, 66170. PHOTOGRAPHY DATE MARCH,1966 SCALE I I- • 100 1- 100 0 ICO 2000 200 300 00NTOUR INTERVAL-2 FOOT LEGEND u 5. HIGHWAY R BRIDGE r-= INTERSTATE HIGHWAY n SIYAMP .. `. N.C. STATE HIGHWAY Q INDEX CONTOUR —a,— SECONDARY ROAD SR ISIS INTERMEDIATE CONTOUR STREAMS 6 SHORELINE APPROXIMATE CONTOUR--�`- TOWN LIMIT ---- DEPRESSION CONTOUR �•_�� SPOT ELEVATION X 16.6 NEW CATCH BASIRVINLET �>v DRAINAGE BASIN LIMIT A— EXIST. CATCH BASINJINLET DRAINAGE SUB -BASH LIMIT -G-6— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE =—= EXIST. STORM ORAINLINE �= _= DEPRESSION/RECWWGE AREA HF PREPARATION OF E MAP WAS FINANOE RT THROUGH A GRANT PRO-3 BY THE NORTH C-ROLINA COAS MENT PROGRAM, THROUGH FJNCS PRGV OE E COASTAL Z MANAGEMENT ACT OF 19T2. AS JNEVCED. WXOH IS AC -TEiEO BY E -CE OF OCEAN AND COASTAL RESOU'CE M—GEME.NT. N - GNAL OCEAN C AND ATMOSRXERIC AO.MINISTRATICN. C21NQO00 E2,562,000 ,p. � 4 '�-}• yA F � F � L •''t „F s tv ,r -4 r lm { . ` / }=�1,7 2 "=4'c 1 '+ rd #ma y' �� �i-.v' . ►• 1 y4i Syr I _G t nil IF7*1 777 R' R T - ♦ '♦♦ -f---- .. - �. . .. - A 1 ji 64. 2.Pfee.Yti� r�d�ir'sT6: i % Ix \­.VRT;114. N GENERAL NOTES I. MAP COMPILED BY STEREOPHOTOGRAHMETPIC METHODS IM ACCORDANCE WIT. NATIONAL MAP ACCURACY STAN.... S. 2- GRID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SKYEY: SOUTH ZONE 1927 M.A. DATUM VERTICAL DATUM 1929 G.A. S. CONTOURS ARE 9UPERIMVOSEO ON AN ORTMOPMOTO BASE. ♦. TOPOGPAPNIC YAP PREPARED By LANDMARK ENGINEERING COMPANY INC. P0. BOX 66B C..Y, N.C. PROJECT NO. 06170. PHOTOGRAPHY ONTE: MARCH,1906 SCALE; 1 inch • 100 1— too 0 — 200 �QO CONTOUR INTERVAL-2 FOOT LEGEND U S HIGHWAY few BRIDGE 1.1051AIE .IGHWAY rU/ SWAMP , ; _ ` 1. AEC STATE HIGHWAY Q INDEX CONTOUR SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR ��_• STREAMS B SHORELINE - APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR_ SPOT ELEVATION 116.6 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —•—A— EXIST. CATCH BASN/INLET= DRAINAGE SUB-BASN LIMIT —A —A— NEW MANHOLE NEW STORM DRAIN L N'E EXIST. MANHOLE EXIST. STORM GRAN LINE �= _= DEPRESSION/9E.-HARGEIREAC A_ n N U a 111 T E A CN OF TN S MAP WAS FINANCED IN PART ­CI,GH A GRANT PROV E NORTH C"POLINA COASTAL MA.NACEVENT=gCGPAM, THRCI. S PRCIIOEO BY THE COASTAL -ONE VANACEVET ACT OF -2, AS A N .S AOMNSTERE0 EY THE OFFCE CF OCE= AD C:NL RESW..._ V ♦_�c.VE.NT, NATIONAL OC_ANIC AND ATMOSPHE=1C 4MNIS R 4Y - f b' ` 'i` ,F�FjY1 .}YY ' ,r.��:^3� •' l4 �iYl� `f ~ ` t� ..W.A - �'• pRg-,yr v - ,,S d'a�s: + =N •i ri,. �ilr .� /yy, �4NE� � i'rl�a � ► � .�' F • 6 ...1i � � !� ' F t !R: t'T.., ;,cJ,�'z<u .. � 4 K r T ��.•t�, / J' �•'- f ' •Y �f 1 � - --- f:� l r' • y � ..IIy ih � � . L rh. ���� r� r `� ; 7�r•' yet• o t alBft ,f � `. .� 7 .�� `F �N�# `� 6 fit `✓ 'j r♦ rl�E S �i , 1 / 1 �i -•. �. .�./j �%'_'�;. .,�" 's-2 �,� .�f `f" �+ .e / - !' * .a.1 ^4 .� • i;.` rr.1 c s`zw zA ! ,• 1#e s Y \i �, LA '�� T`• �r •; � f/�. r ��...�►� •/JA ,T\�- J sM �. ' �. y� ..�%f3�_ �: �?' "1y` �� ;,,.i �y rJ �' � ••t � �. �r �' +/F ,�q!' R, Fi � ��/�?/r/f � � �"r �'i•} a � � ia. x�,AyR• Zi. X� � . ij* --rte-_ �.A i •i, `r �♦' � r ..6 a . f /:mot J. ��.� i�` n #� � .t "( ,JI` ; f�' -�* Z i .{'✓�J��Q f. � r .,r.. ,.. ` j::. �.� 'i t �... - .< ..� +Ld�`�T�, �.._� �'rli/�'�... �iP��i,�, 1�, eNrnH.. s � .. a f � � ♦ t � '< - � A � T} �: Pr:� w�rys`•SrV t•"+F L'j-�'• ` 'M s'�i.' ia' fir( - :1"•� .i _ _ e!i ilF •�'• -TrF r��rP c X.-�♦ YR^�.h. 4(:�F `Z_'.'o, yh'� 2 -' . ' L? Ai : •.f , , '1~ `� J j4 F' t• R N tE • .a 1 • 1'. X .'N �11• , .T YSs�.1 �'. .,t"�����Ti� c . ( iE y�•~ ' r � +��'?.� t ' -�, '2 0��" `�i-!`,`i - l 2 � ¢� ,•j }.0 �. Y � .I .�T/. :'T fl H" ,NZ J -:� T � , '{FY .-}'K-.. zi �, y - ,'%3"•�y,.'��! S• �;yr ��=` •.�!'r � •y -i 17 �'',r "j�1i,.• 'sf-..,, i °. `��/ -Y- � �.���.. T yu�.-i � ^W�� ; ,._�'e._+ .�!•�Xnfr.�,'1!�%�•w['>� '} {:. �J �..,�, � ��fjN 'F• BL •: ": 'tom` .. f- -^.'�X!'"' a .`. :." 1 .-�'1-t4�i?�4�.4_�iY,11_T T, v_. • �j' - •MATCH SHT. 11 .r m a N GENERAL NOTES 1. MAP COMPILED BY STEREOPHOTOGRAMMETR IC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. CRID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SYSTEM: SOV IN ZONE 1927 .A, DATUM VERTICAL DATUM 1929 G.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. R. TOPOGRAPHIC MAP PREPARED BY LANDMARK ENGINEERING COMPANY INC. PO. BOX 666 CARY, M.C. PROJECT N0. 661T0. PHOTOGRAPHY DATE; MARCH.1986 SCALE: 1 I— a 100 19Rt 100 0 w 200 300 CONTOUR INTERVAL-2 FOOT LEGEND US NIG.- rR BRIDGE �Y INTER5TATE H.GHWAY HW SWAMP • • I N. C STATE HIGHWAY O INDEX CONTOUR -Ac'- SECONDARY ROAD SA 1523 INTERMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR - _ TOWN LIMIT -- - - DEPRESSION CONTOUR�� SPOT ELEVATION X 16.6 NEW CATCH BASIWINLET ■ DRAINAGE BASIN LIMIT - A - A- EXIST. CATCH BASIN/AiLET DRAINAGE SUB-BASW LIMIT - A - D - NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE � - DEPRESSION/RECIVIRGE AREA c THE PRE?uid-{N CE THIS MAP WAS FINANCED IN PART THRQ4M A G=<\T Po DVICED BY THE NCRTH CARCLINS CCASTAL MANAGE.MEYT PRCGRAM , T-CUGH I:INCS PRGVICEO BY THE CCASTAL ZONE MANAGEMENT ACT CF S72. AS AME.NCID.'-a IS ACMIIASTER�.EC BY THE OFFICE ClCF OCEAN AND CCA FE RCE MANAGEMENT, NATIONAL CCEINIC AND ATMCS?HE.NC ADMINBT T. CN. MATCH SHT. 12 MATCH SHT. 11 L(.F Its Ay�.�((f�`-�T a•- Y i 1 1 1 1 1 1 1 n GENERAL NOTES I. MAP COMPILED BY STEREOPHOTOGRAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANOAnOS. 2.- GRID BASED ON NORTH CAROLINA STATE PLAN CGDROINATE SYSTEM: SOUTH ZONE 1927 N.A. DATUM VERTICAL DATVM 1929 O.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPNOTO BASE. W. TOPOGRAPHIC MAP PREPARED BY LANDMARA ENGINEERING COMPANY INC. RO.. BOX $66 GARY, N.C. PROJECT NO. B6A0. PMOTOORAPHY OATS! MARCH,1966 SCALE: I mck F IGO 10H 100 0 XX! 200 J90 CONTOUR INTERVAL-2 FOOT LEGEND U S. HIGHWAY 6O BRIDGE INTERSTATE HIGHWAY O SWAMP _ -A I N. C. STATE HIGHWAY Q INDEX CONTOUR SECONDARY ROAD SR 1523 INTERMEDIATE CONTOUR �y STREAMS B SHORELINES APPROXIMATE CONTOUR TOWN LIMIT DEPRESSION CONTOUR SPOT ELEVATION X 16 B NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT — — — EXIST. CATCH BASIN/INLET DRAINAGE SUB -BASH LIMIT —A—A— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. 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N.C. rROJECT No. 66170. PHOTOGRAPHY DATE MARCH,13E6 SCALE I inch • 100 1- IOo 0 IOD Zoo 3 D CONTOUR INTERVAL-2 FOOT LEGEND U S HIGHWAY R 6RIEGE �1 INTERSTATE HIGHWAY R SWAM_- N.C. STATE HIGHWAY Q INDEX CONT.:UR-pry\ SECONDARY ROAD SR 15E3 INTERMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR /-- L•+=a{�'—' SPOT ELEVATION A .6.8 NEW CATCH BASIN/INLET DRAINAGE BASIN LIMIT —A—A— EXIST CATCH BASIN/INLET _ DRAINAGE SUB-BASHLIMIT —O—C— NEW MANHOLE 'ems NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. 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'� + ! ,�,Lz-''.`i•?,'1 •J i '._,� ry•�4�,ry, i �'_ . e1 � � � •,'..'�"*•�„r.. � P `:` ���� 1. �))-�.��.�%• F L � s'a. `' � w�.r.' .�?�� L .W _ ,�?T#r • ar Yr� '�.rr'1'� Pe'� •t. - tM iS�' /�, kL, i c .y�� � -, a / .. � - � t. :' -ii •. � 'IL '_. �f,A.���J_ �' ;��i �/ 4;c7,.1 � )JO,�r �7It `�p� .'{k. ... - �-i•'! �/� r•..),r z zz'l E2.59N.000 EE,995,000 MATCH SHT.25 C E I, u GENERAL NOTES I, RUP COMPILED BY STEREOPHOTOGXuNAWITRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GAID BASED ON NORTH CAROLINA STATE PLAN COORDINATE SnTEY- SOUTH ZONE 1921 NA --TUN VERTICAL DATUM 1929 B.A. !. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO MSE. A TOPOfAAMIC NAP MIERIAED BY LAND — ENGINEERING COMPANY N1C. IB. BOX 960 CARY. N.C. CROJECT Nc B61T0. PHOTOGRAPHY DATE'. MARCH,1966 SCALE 1 1aeN * 100 1aR1 100 0 100 zoo l00 CONTOUR INTERVAL-2 COOT LEGEND u 5 HIGHWAY ri�;t BRIDGE �Z INTERSTATE HIGHwar MW SWAMP N C. STATE HIGHWAY' Q INDEX CONT: UR—gf�L SECONDARY ROAD SR IS'A! INTEhMEDIATE CONTOUR i�../�� STREAMS 5 SHORELINE APPROXIMATE CONTOUR TOWN LIMIT DEPRESSION CONTOUR�� SPOT ELEVATION X 16.8 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BASIN —LET _= DRAINAGE SUB -BASIN LIMIT —A—A— NEW MANHOLE NEW STORM DRAIN LINE ERRST. MANHOLE ENIST. STORM DRAIN LINE �= _= DEPRESlgW RECHARGE AREA T CE—A-: OF T !S MAP WAS EINANCEO IN PART iNRO,GN A GRAYT _TIE BY THE - H .CARCLINA COASTAL MANAGEVENT PROGRAM TH—CH FJNCS PRCVICE: BY THE CCASTAL ZONE MAVAGEVE OY @ �, AS AMEYCEO, WHICH 15 ACMINISTEPEO BY THE OFFICE OF OCEAN AND CO .- RESWRCE MANAGE VENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMIN6TAATION. N GENERAL NOTES 1 -1 COUPLED BY STEFEOP.OTOGRA.VEl- C VETHODi ACCORDANCE WIT, NATIONAL MAP ACCURACY STANOARCS, 2. CHO BASED ON NORTH CANCLINA STATE PLAN OCOROINATE SYSTEM :GNL -92? UATUM _IICAL lar._N �N29 G A S. CONTOURS ARE SUPERIMPOSED ON AN ORT,OPHUTO BASE. ♦ tOPOGRAPHIC MAW PREPARED BY LAND.— ENGINEERING CO. ANT ANC PO BOX f68 �APY, x.C. ERO,ECT NG. 66170. PHOTOGRAPHY CAPE- !_ARC., I SCALE I �n<N IOC 1XM 10. C C0 EEO 3C0 C: TOUR INTERVAL-2 FOOT LEGEND d S HIGHWAY 6^© BRILGE �1 Ix/ERSTAIE HIGHwiv C / S.A.✓ N.0 STATE HICH'WAY Q INOCR f*NT, VR �_yf�\ jI SECONDARY ROAD SR 1823 1NTENMFDIATE CONTOUR =� STREAMS B SHORELINE "'� APPROXIMATE CONTOUR TOWN LIMIT DEPRESSION CONTOUR SPOT ELEVATION F I6.8 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —A— EXIST. CATCH BASIN -LET DRAINAGE SUB-SASW LIMIT NEW MANHOLE NEW STORM ORAIM LINE EXIST. MANHOLE EXIST. STORM GRAIN LINE u � =_= DEPRESSION/RECHARGEAREAC L THE PPEPARATICH OF THIS MAP WAS FINANCED IN PART —CWH A GR .NT PROVIDED 6Y THE NORTH C-RCLINA COASTAL .MA.NAGEVENT PF:GRA. , THROUGH F_NOS PRC-ED 3Y TIE COASTAL :ONE VANACENEUT ACT CF 972. FE -MENCEC. WHICH S A:MINISTEPES BY THE OFFICE OF OCEAN -COA NO T-L FSCUP.CE VANAGEVENT, NA-,NAL OCEANIC AND ATNOSPHERIC AC.W6TRATCh E 2,39..000 E 2,33n,000 E 2,391.000 N GENERAL NOTES I MAP COYP.LED BY STE RECPwCTOGRI—ET',C METHGO1 ACCCROANCE WITw NAT.CMIIL MAP ACCUNACY S'- —S 1 +HID 3ASED ON NORTH CANpLIVA STATE Hta N ..ORDINATE SYSTEM :NEA -'UM utxf�: •L ..AI.M cto ;A 3. CONTOURS ARE SUPERIMPOSEO ON AN ORTHOPHpTO WAGE. ♦ TOPOGRAPHIC MAP RREPARED 91 LANONARx ENGINEERING CJMPANT INC PO BOX 648 NARY, N.C. I VO.ECT - BC,'G PHOTOGRAPHY LATE .,AP. ,1186 ',CALF I ,ncn 1LI. IRRI C MTOUR .NTEHVAI-2 FOOT LEGEND . S HIGHWAY /E© I.RIEGE �t INTERGTAIE NIGHM♦T CVI .RAMH _ A C STATE NICHNAY .4 INDEX SECONDARY ROAD SR ISk3 INTENMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR o SPOT ELEVATION ♦ 16.8 NEW CATCH BASIN/INLET d— 4 III DRAINAGE 8451N LIMIT —A—A— EXIST CATCH BASIN/.LET DRAINAGE SUB18ASIN LIMIT —AEG— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE �= _= DEPRESSION/RECHARGEAREAC�� —E iR.EaARAT.GV IF THIS MCP WAS FINANCE] N PART TIRO -CH A G-NT �ROVICEO _v THE NO,— CAICLINA C_AS'AL MANAGEMEVT =— AM , -?.000H F'JNCS —ICED BY YHE CCAS-- ZONE MawIG 'T .ACT CF 912, AS A.MEVGED,—CH IS ACMINISTE.REO 81 TIE OFFICE OF OCEAN AHO Cp S'SL RESOURCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPME.RIC ACMINISTRATIpN, =■ MATCH SHT. 27 .� y •yV� � .y,. �i3xn,�'t-i. a .Sf'� r�'�� �*!t„�,`�F ♦ ,.- '. J t'�L� �it�� � . T d r- .•'- S � Cq,....i�:. r: is x.i' 'r _ ��:rt'T4.�, �t �.,�.. -. ?._- a... ri •++,n' � � a " r '� F �' `�.Lx . ' ter.;—_� _�f'�Y � ( �•- ' � '� �h�v�' rin—Sy7 S- .. Jk- �i• J& �• � � t�",- 1 .f`� :ram �,r"i'• ' � � ':9 ., 'x' e - i ��' ��-r�� xias to �-, •�3�:: h 'Y +. � ;_. .. _' _., - ,.. ,�, i w rraf �. w i � F���n✓ � -, +..R `-'h} `,_ ` ' � rya �� . � .. � a �,g r''k. t'c v >Z �x .�. A � ✓' .a`d � Z2 L ,.S itr ,�'i `'�t�, r , �-::� �'r=-� � �+G.F,.'�A.;t �'�,��� � .� =�r s v` ` ;'�' }4� `4 `r� `�`� �•k :``! n9: x,fA��,. iL ��"�.'�. 'Y i7 • a ;1 #Y�� . k . '�' 3- j t• S :� %�`�° {,` 'r \ , .� �w tit�'d ylt /. %• _ - ! .� ;tr ��it "�k .�'af _ �i.F, '--'+ i4: att :r �. ld�' � t. {�1'�.>S 'w Y•.-` �y :: �'"� a"�a { 6 ,�y� t ,:�s }q',�d �•(e s? j."' y. "�! ty ,y�� /�+"°'ff� '. 7t� ,; 'x{, Pg r � ay- +.? '..,;. f• y , '.'�� `« :� c�'M_'f„�' �. ..� y'-' L � '��,�, `,+�E x tYt'� 3..`a7. �{�y� •yi i T is+;(��{� 3 y s.. +a'.' � �# i1 `� I�� yx.a �' .�.5 fi 1. ='p.,.�'• - ` S.�. a`;. , .. + M.t\::" I.:+++ii�"'�lt ` `� • ,es - s { ts.",a, "��' 7Tl'tW- '�Y_.". r ! �'j y�'i' x t • r yM.?ri�i�£_7`Y. 5�e, 97 'lt ar: ".��}�:r C.v .R:`, � Y.�•:tt �ii'F.'. ..�,�' k� .- ai t i� _ ! t ,'�` rs - f nl ��'�`'' `a14i ���� �� rt� _.� a �,,. �i �*�' %.'asm e `j l un..� "",� ' •rS k�•T '!�' + y�,._. ,.fi jam._;.. at `., �, �� _ � t,: �+ t • � as �, &r ?r � � �c� �.. i ,,t- s. r�" t-�� - - � _ ��- t �Z�� � t �. _ a sr (t. q, 7.�x� � �ir� ` Y'C b` y.: t � _f„�� .:`t..J "{•' y 'T.-:. F •� ae f �"c s✓ •yY �' _ "+fir ` F 4.lYY f � #+r 2 L.-_ i i-R �'� f \ .p�. `• O r A '� �V � fi � 4 } -c r y '-_F �. ��, '' � �-'" ;; f �z``s� �.�� �'..N ■ir .s , ,� ,era::. .r' `> y i. � yc ;�, "". �i�� , " � � � , y �i yY� t ';�,. yam. ;..r�"4 f :��,t� �,1„: ... �:--- s ..- f'';, `._-�,:.� �,•�. �-° IS m 'r - - - - - - >• a {�- F .�-t ° f t 6 � �. �-. `i.a ;,(F�'% ;��, h. �'fvv • a' ..'t � . f -t • E2.396,000 MATCH SHT. 27 IEJZ.59;000 'R Wyl I A: A' j GENERAL NOTES - ACC:A%CE A - Na' -.IA- A- A C.i AC, - A �. S'A Z ;nip BISEO .0— �—IIIA STATE —I A y. C:NTIRS ARE SIPER-MPCiED �N AN OQ740R%CTO —E. A I FOG.AP..0 MAP-E—rl 5, ...-.A.nv . EN311ILP1.0 C­0P ­ PO -CX EAH h..� .61-D AP SCALE I Ol 3,0 CONTOUR kTE0lA­2 FOOT LEGEND . I HIGH— PIPPILGE r—1 —ENS—PE NIGXWAY Q —A- N, 1. STATE M.— Q INDEX CONTUR SECONDARY ROAD SA 5k3 HT kMEDIATE CONTOUR STREAMS Ill SHORELINE APPROXIMATE CONTOUR TOWN LIMIT DEPRESSION CONTOUR SPOT ELEVATION W IR.B NEW CATCH BASIN/INLET DRAINAGE BASIN LIMIT —A—&— EXIST. CATCH BASIN/INLET DRAINAGE SUB-BASA LIMIT —A —A— NEW MANHOLE NEW STORM GRAIN LINE EXIST MANHOLE EXIST. STORM DRAIN LIKE DEPRESSIWREC URGE AREA THE OF -S MAP WAS FINANCED IN PART TlP.CUGA A GRANT "C" =Y -.E NO T 4 CAROLINA COASTAL NA—EMENT FRCGRAM TKRCUGl F�NCS P�NIZE3 BY THE COASTAL ZONE MANAGEMENT ACT OF *72. AS AME'JCE2, WHICH S ACNIHII-REO 91 THE CFF;CE OF CCEA. AND COASTAL RE SCUFCs MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC AOMINISTRATION. E2.79B.000 E2099.000 E2,600.000 N GENERAL NOTES 1 MAP CONPILED BY STEPEOPNOTOGRAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2. GRID BASED ON MONTH CAROLINA STATE PLAN COORDINATE SYSTEM SOUTH ZONE 1121 NA DATUM VERTICAL DATUM 1..9 D.A. S. CONTOURS ARE SUPERIMPOSED ON AN OATHOPMOTO BASE. A TOPOGRAPHIC HAP PREPARED 61 LANDMARK ENGINEERING COMPANY IHC. P0. 60. 666 CART. N.C. PROJECT N0. 6617 0. PHOTOGRAPHY DATE; MARCH.1166 SCALE. 1 inch , 100 1— 100 0 100 200 S 0 CONTOUR INTERVAL-2 FOOT LEGEND U S HIGHWAY Ilew BRIDGE �S INTERSTATE HIGHWAY © SWAMY `__' `_ N. C. STATE HIGHWAY <5 INDEX CONTILIR —a,— SECONDARY ROAD SR I523 IN TEhMEDIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR - -'�`- TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION X 16.1 NEW CATCH BASIWINLET s...a� DRAINAGE BASIN LIMIT -A—A— EXIST CATCH BASIN/INLET �APPO�= DRAINAGE SUS -BASIN LIMIT -D—G— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE '•-_�'-+"�= EXIST. STORM DRAIN LINE —_ -- DEPFES5KWAECNAROEAREJl=_ -YF FF.c�A.�ATICN ;F T.:IS MAP I-S FINANCE] IN PAF-T-Ct GN A GRANT 21 NO— C_ CLI\_ COASTAL M_ - _MEP' PPOCRAV TY 0C F,C~ FFCVICEC BY T,E CC -STAG ZONE NMANACENENT ACT OF IST3, AS -'CH 'S A:M:N'STERE: BY THE OFFICE OF OCEAN AND C-AS FE=:u'.. MAN EVE%T, NATIONAL O:EANIC AND ATMCSP�E:TIC ACMINISTPAT:ON. MATCH SHT. 30 E 2,SSS,000 �s s > MATCH SHT. 29 Ez 599,000 E2,E 00. 000 f i.+,. •yss r .pry Et,,�R,�N.s"fir E.� r,•. , �+E iit fl ,t' tzflT,_�1ry�gyr /'ry',i�.. � '. c. e-- 1.• ,�'� d ♦! r 1y �4 "'lwrySp7 .•f� .� fa �E. o.. �(•!•+.4 ML"i�'M �.; ; ..•E % Els+ ARP Ys•'•�i ~�j • ice, i �` 1 1 Jk 142 1 IF. ._-.R +rF N GENERAL NOTES I NAP COMP,LEO BY STEREOPHCYOGRAMVEYR C METHODS N ACC CADANCE AT. NATONAL MAP ACCURACY STANLANLS 2 3N0 311E0 CN NOATN CANOLINA STATE H,AY COORDINATE "IT Eu -TH CC HE , A -ATUN VERT ^Ac IAT,M A29 G A 5, CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO SASE. ♦ TOPOGIII.—C MAP PREPARED BY .ANLm ARK ENGINEERING CUUPANY IIC PO DO- 6-0 All, N.C. I HO, cl 111 •6110 PHOTOGRAPHY LATE 1.APCN, I.Bfi YCaIE I ,ncn ICC I.RI CONTOUR NTERVAL-2 FOOT LEGEND , 5 HIGHWAY 6U♦ HIOLGE �Y INTERSTATE HGHWAY Ani, .w•MH ,:._ N.C. STATE NIPHWAY O INDEX TONT,U:o"CU. . SECONDARY ROAD SR 11,3 INTENME 111TE CONTOU0. - $TREAMS G SHORELINE - APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION A 16.E NEW CATCH BASIN/INLET DRAIN.E6E BASIN LIMIT + +� ENIST CATCH SASIN/INLET � - DRAINAGE SUB'DIS"LIMIT -G—A� NEW MANHOLE > �— NEW STORM CRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE — =_= DEPRESSION/RECHARGE AREA r THE PRE-ARATION OF THIS MAP WAS F.NANCEO IN PART —0"" A GRANT P OVIDEO BY THE NORTH CARCLINA COASTAL MANAGEMEXT PROGRAM , TNRCUGH .F:NOS PROVIDE) BY THE COASTAL ZONE MANAGESENT ACT AS AME.NCEO,'WHICH 15 AGMINISTEREO BY THE OFFICE OF OCEAN AND CC AL RESCORCE MANAGEVENT, NATIONAL OCEANIC ANO ATMOSPHERIC AOMR+STRAMN. R D C MATCH SHT. 32 N GENERAL NOTES I. MAP COMPILED BY STEREOPMOTOGRAMMETRIC METHODS IN ACCORDANCE WITH NATIONAL MAP ACCURACY. STANDARDS. 2, GRID BASED ON NORTH CANOLINA STATE PLAN COORDINATE -. SrSTE M. SOUTH SOME "" N A UATUM VERTICAL DATUM 1929 G.A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTMOPNOTO BASE. ♦ TOPOWARNIC MAP PREPARED 91 LANDMARK ENGINEERING CONRANY INC. P.O. BOX 668 CARY, N.C. E ROJECT N0. 96IT0 PNOTOGRAPHY DATE; MARCH, I3BG SCALE I InXA a 100 NM - - I00 0 100 200 S00 CONTOUR INTERVAL-2 FOOT LEGEND U S HIGHWAY G© BRIDGE INTERSTATE HIGHWAY. © SWAMH _ --- N.C. STATE HIRHWAY Q INDEX CONT,.UR —aE SECONDARY ROAD SR 1513 INTERMEDIATE CONTOUR STREAMS 8 SHORELINE APPROXIMATE CONTOUR TOWN LIMIT --- DEPRESSION CONTOUR SPOT ELEVATION 16.9 NEW CATCH BASIWINLET —d DRAINAGE BASIN LIMIT — A —A— EXIST. CATCH BASIN/INLET DRAINAGE SUB -BASH LIMIT —A —A— NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE =——_ EXIST. STORM DRAIN LINE � = _ = DEPRESSION/RECHARGFAPEL C THE PF eJATICN OF THIS MAP WAS FINANCE) IN PART THROJGH A GRANT PROVIDED Elf THE NORTH CAROLINA COASTAL MANAGEMENT PROGRAM THROUGH —CS PRCVICEO BY THE COASTAL -NE MANAGEMENT ACT OF 1972, AS AME�ICED, WHICH IS ACMINISTEREO BT THE OFFICE OF OCEAN AND COASTAL RESOURCE MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION - SHT. 31 2 E 2,E02AD0 N GENERAL NOTES ;GaP .ONO LEC. 9r SE-ECPNCTOGRAMMETR-C METNOD, ACC II—CE W iN I.•C.vAL uaP A..+RACI STANCARCS c ;NBC 3ASEO .v NOR•H CAHCLI VA STATE v:AN COORDINATE SrST[N _:vE �-ZN A LATUM .tn, AL .Ar. '"29 0A I. ..NTOVRS ARE S'iVE—POSED ON AN ORTMOPN Cl BASE. A "POGR—C MAP PREPARED Br ANLNa ENGINEERING C;MVANr PO BOA ERN API. N.C. +O.tt• .r NSi'0 PIOTCGRAPHY WE '..C.'I)BN ,_ALE . c+ C :'.•OUR N7E+1A.-2 FOOT LEGEND S HWHMAY 6�A BRN 4E INrERSYArE HIGHWAY O .wAwI, N :. STATE HIFHwAY O INOEa 'ONTLUR SECONDARY ROAD SR ISi3 INTENMEOIArE CONTOUR STREAMS B SHORELINE �� APTMOXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR O 8 SPOT ELEVATION R IGA NEW CATCH BASIWINLET >° e � - DRAINAGE BASIN LIMIT — • —A— EXIST. CATCH BASIN/INLET i DRAINAGE SUB -SAS. LIMIT NEW MANHOLE � NEW STORM DRAIN LINE EXIST. MANHOLE iar= EXIST. STORM DRAIN LINE � =_= DEPRFO.1OWRECMARvt AREA THE PREPJT N OF THIS .MAP WAS FINANCE] Iry PART T.1— A GAANT DVICEO E THE NCPCAACLINA C,.ASTAL .MANAGEMENT PR.GPAM . —MGM FYTn NCS P? V;CEO 9Y THE C.ASTAL -ONE MA E`.EVT ACT CF 9'2, AS AMENCE3.'A— .S ACMINSTERED 9Y THE OFFICE CF OCEAN "0 C.A"'L RESOURCE MANAGEMENT,%AT:ONAL OCEANIC AND ATYOSPNERIC d.MWIStRAT;ON. 11� ',- .!' � '� i++t},�'y } ��• tea=' `3 a`. � a � ;J.B• ,F �s I;', � �=n',@•r �C� �'�'4 �F.` .. . • ,� �� � °fir i i�,�t, e iY. r Q r - y s Wr ilce - :• ": '. .r, i"li'4 t i,.aa�'r} "g� ems, _. � 'b '"e w*� '' 4g¢ rig" x ..., a -.c. Y="`•. ; Y5`+�%{ t`. - C Y •• iyp is-F sk. y -T 07 Mal - . • r „ f { ao $ �t�✓k} ty4�FVIN � 3� k i uyx£ sue' Y'�'i•` l ,YS VpY-}..gY x•i,,FiKi. .r1aG _ - - �.,t£�y. � a' r � k:. K y � rr`�'�`Z,•-4,�. •7U� _ £k i•'p'" F`, � t { " 4 :.k.a'a`�+.e^� ��A `it + a'<. ,�'.r F°'{r . .s-` } a.�i• r.,!:.e Sr. , z { . r Yl f°' e q," -;�` -�f, � yyp^�: '4i tp�. �?{�s .".��� �. �r^y .n ';� a'Ni��k �,;ta +T "'•�.�( ,.� .,.1 r �'�•ry J. ,rvt' a . �. �'`'•:s,ri� ����r= ,s � • �. '..i"� r�i. :a s .-ytY{, _ .ti _R � .� i. f 41:}ir.: _ 3 a .,;;••t�i:1r i�c:r. ��;'�. "'`. rt�r yi''' e ye•.'bgy�l `' x�:;iq '*�;^ T. S bsti •.l h � ''+''s���� Z �`�V ':+ '4 i�-.Tas �.31` K f �, t .'� >'.�j+y"s"`}���' �4 �'�; Z, f t� t ?C4@'� � �'�'��. yr% -y-5 �,t�'Y -st♦ >tr. `Ss� .' ,ye •, 41X � .� • �� .','.}�+si „� S •v� 3' << - - r�.. � Zip' �,. ' . .� �^ h t. �w,..v .'k �:�.�' <i,,:s_ ik e: e-g:'+�1�.��' w� � ��v'�•.��'. �v �`� " '3,w.,�', � } rt' l.'- l .arK _ity ^l Ti y 'i P•,$ `• '� t _ _ _ iey=. .• ''t.- �r F � `'Kt - ,1�{ +r�3 •tom v: v �P t .\ � Y: , i t �•t'c. �P ° � ^, �' 40 E 2.E 03.000 E2,604,000 MATCH SHT. 33 F E.600.000 N GENERAL NOTES I MAP COMPILED BY STEREOPMOTOGRAMMETRIC METH003 IN ACCORDANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2, GRID BASED ON NORTH CAROLINA STATE LAN COORDINATE SYSTEM. SOUTH ZONE 192? N A UATUM VERTICAL DATLM 4929 G.A. 3. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPNOTO BASE. ♦ TOPOGRAPHIC MAP PREPARED B/ LANDMARK ENGINEERING COMPANY INC P.0 BOX 66B CAFY, N.C. FRO+ECT N0. 86170. INOTOGRA-MY DATE. MARCM,1966 SCALE 1 -h a IOC F♦AI IOO 0 1OO 2C� 300 CONTOUR INTERVAL-2 FOOT LEGEND y S HIGHWAY INTERS—E HIGHWAY OU SWSMM N.C. STATE HICHWAT © INDEX CONTNUR SECONDARY ROAD SR IS23 INTENMEDIATE CONTOUR STREAMS 9 SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION E 16.0 NEW CATCH BASIWINLET +ids DRAINAGE BASIN LIMIT A — A— EXIST. CATCH BASIN/WLET DRAINAGE SUB-BASW LIMIT — 4 — L — NEW MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE �= == CFM ES.'IOW RCT. F AR3E AREA 0 PY L n r: It THE RE —TX}. OF THIS MAP WAS FIMANCEO IN PART THROUGH A GRANT PROVICEO BY H CAFCLINA COASTAL M NACEMEST PROGRAM, THR CCGH F 'S --CEO BY THE COASTAL ZONE M NACENEST ACT OF A72, AS cMEVCEONWHICH 'S ACRUNISTERE3 BY THE OFF.CE -F OCE-N AND COASTAL FESOJRCE MANAGEMENT, NATIONAL OCEANIC AND ATMCSPHERIC ADMINRT—CN. m 777 Tel MR Oi- 51 24 14 if E2.e=000 E2,BDB.000 MATCH SHT. 35 Es,aot000 ' '•i ec �. y N GENERAL NOTES .1 .►-f •� _ L�•: � .N ! � ..�E[•a� �^4 •,f .•S• MAP CONM WST LEJ B• ry owC METHODS _ I CCCROA CE WITH ATONAL MAP .CCU •CT$Pn0anC5 ���-,�11•�". a y� / •�:a :•.0 IASED :n NJR•N ^aN "L ic.E -Al _^_ORD:rYiE t,'.'•• '• 'y _ •,.; !c Imo• SrSi[r I'A S "T...nE v2- • :<rVN ` A • �' •t ,�'4 _1 ♦ It, ['^ �.y'•{ ,t'A��YL '��`Y' i •.� silo [AT-e29 0 �'t �'` ' �•.9 B • / �- lOUWO' _ ♦Sl�.lI_ /��=\ YI ,S - / ! , 1, CONTOURS ARE SUPERIMPOSED ON •N ORTNOPNOTO BASE. \ • ; I Y 0•U! .r ♦ 'N.aa�aJ// ���1_ -I - Na R N IN ERIN ,j . � - L •C �A a �' .�•.' �.�,_ - _ 2_ ��{(��y a fJPOG 11 RU Mal PREPARED B` AND.A.. E Ge.: 4 �' , r , JA1� ✓ / �/ ' I ./� . A • f NOPECT INC B6 POO BOi 6iN PHOTOGRAPHY LATE PCN, IVB6 �..'.�� -� / �E �� -�\ ) •'ems;—� -IT A 1 ` '_' Y I 'R •.){{W_ �N \ ' ♦= C I ' - r W `A� B �' SCALE I cn - 100. I.r. til " ` ,`may.~L/ • WIN / ��,' yA• 1•/ 1�'� '.• r'G . ► % t// r i I �` ���ro �` r � `' ...-. ) i w- •' '� _• v Z �. J. - ,-r ! w,y•, f,• L a l ^_ - •� c` , s C,NTOUURR NrEPYAL-2 FOOT _ " <� C[LAR TR[[ LAN[ J% _ • • E. �' ri di I• •) �t ' I ^ �y •�� •. + .tom./LLEVL �R- [• _ 3 r �t aY� R yL •.� ! iWJ to ram'' J F.SM�' �' r _ y1• ale - LEGEND ,j.E R :s N.—p 1'Iw` ).Ya= o Y -- yi��es .{! B/�/�~{may • ~l- `i ��'�If�� _� P S NXILGE [rE,11�i�t�R 'L'-r :nT• mTERSTArE HIGHWAY© sWAYP •_ _- i, E ,� i' -� _- •,�• -� .ii ` �.ii - 1 �y'•�/ i�i ~i .i� ;. Y • L ' ; �.: N.C.O STATE HIGHWAY INDEX CaNTUUR ,a . -v Jw L y��y I ► ./ xP�-' v SECONDARY ROAD SR 1327 INTENME0IATE CONTOUR STREAMS IS SHORELINE APPROXINATE CONTOUR ' t'' * t7 `��.,,I 1. f"�1 ?JP ri •�!'`r t��a .s T� is.- vu ! _ j�' t', �' ; �'� ��•r�•� - ` �jI TOWN LIMIT ---- DEPRESSION CONTOUR 1 �.!o _.. Ji • a nY �.41 "'�'• ��8� L .E, ����y{ �1 .� R_I1iEl�✓��'I �,91� ' _ - �� L ' /(.�`� L,NT,B '• .. st •qWM W-. �- _ __- SPOT ELEVATION . LLB NEW UTCH BASILET > sl l� ` � i L � _ _ - i - �� ALL— � -• • '•••1� "\— • --- tom •� 5'•�-�' S�•F M• - - •, i DRAINAGE BASIN LIMIT —.—A— EXIST CATCH BASIN/INLET ++"3X ` • L l-'�L t j • + 1'EL l/ DRAINAGE SUR•LASMLIYIT -A —A— NEW MANHOLE LJ0.- E .%�}' +S, till �.. \\\������---L �A'" ., E• :i x . !•• •�+•� �� .nEP �jaN•• - NEW STORY DRAIN LINE _--- Eil3T. MANHOLE -z-� 1 • yB ,�}' � !- N�{..BA-Ift•- ,'/ •'A '. ��" -8+�/ 'F�-`� EXIST. STORY DRAIN LINE ----- '. VRESSIOWRECHAROE AREA C•��'� win IL -A t� _ Pf.c� �`. •\.Tr.' �.. arTI /n`Li_. / •""- - -' M8. r ...R, THE PAE�-i4CN OF THIS MAP WAS FINANCED IN PART THROUGH A GRANT 4 t:... mot; A•.:Y A�w,., rr+ -. r -: _; '�.;'�• r `� vt^-,�'. PFOG— WE /� �Sj-s'�A" y �E - � ,��''�`������ a. x) Y#3ORpea'—"".,�,.r�:��. n; ., tii _. - - �-�, ._.r -_ �r��.: �i.Sti ..�i"PP:y ,.�"' '�.C-... .:.• - • �i.:+"..wr � �e wit+ x �s�:'�G.��'� •» •Q'r- ���r3 f .N,.�-. ...}�- .. - -' -- -- -•�.� �.�. — 7��-'����T�� ". T"-.' -- -.. � _ _- _.__ter --r._ _� � � -..--_ � � �. -- -• -- - '�V_ it l .� � �`;• . 1 i• .01 All 4 }� Z n;. �; `'� q�%��� •�� „� � `tom ��,�..,. �_ � R �- ,�_. i S � "/ 9��r�. 1` �1• - 3. }„ � Via:' C� a'2 A ,� y z tr,�„I"b'�i +'r.. -r, + �.. r „' » , rf r • t Sar+-;vr SI 1.� l� J / �• 3�.r^l[,� ' •- -4 a F. - a - s9• - 3 �s.y'�4 :.� � , � y� � '�`A�t '� � j _ - y tea. Ate; � ( * �/• � / - �d•/ - '� �,�., ', � , r '� a _ E /'1. ' "_� - arm"'';► t , _f-rh �,.� 1` `• Il^ � `\ `1 ,'+ • � 1 -� ��� - Jvf'`� 'i1��/•,C� I � ' /.� Y 11 1 t, Uat1_ � �.2 � i _� � �_ 1.���-"l ^ �, � �'�� - �\/ j. � � 4 _ '../J-; `�� Q ♦1/1,•r y/J/���, / /v...J�� �� � ly,� ,,'.'L e , MATCH SHT. 37 ES,D09,00 ! 0 "m E2EI0000 N GENERAL NOTES Nan COMPILED By STE-EDPH0TOGRAMMETR C METHOD; ACC CROAVCE a•TH NATCNAL Man ACCORACV S-ANCAROS ;HD 3,SED CN NOHrN ANGLIva ST�•E v CCOPOINATE Sr>iFM I.T M Y2S 6A S. CONTOURS ARE SUPERIMPOSED ON AN ORTNOnNOTO BASE. ♦ TOnOGPAPN:C NAP PgEP1RED Br-AN:iMAgq ENGINf EKING C.IMPANT HIC PO BCE ". �AHY, x. C. I♦0.{f• .- A5:'D IIH0TC6q APMY Oi TF r.A ,Ii86 s.aLE I An - I.i IAAr �• :.V. Z•' JCO CONTOUR NrfH AL-2 FOOT LEGEND R ^ HIGHWAY 6© HRILGE Ix rERSTAIE HlG-w HV) . AMH .. N : STATE HIC-NWAY Q INDEX r'ONT,UR SECONDART ROAD SR ISMS INTERMEDI6TE CONTOUR STREAMS B SHORELINE _ APPROXIMATE CONTOUR TOWN LIMIT ---- DEPRESSION CONTOUR SPOT ELEVATION X 16.8 NEW CATCH BA51H/INLET >o DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BASIN/INLET P__= DRAINAGE SUB-BASN LIMIT —A—A— NE w MANHOLE NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE � =_= DEPRESSION/RECNARGEARFA� O O 2 2 U E- a Z THE PPE-ARATC.M CF 1,15 MAP AS F-NANCEO IN PART I.OLDH A GP NT K OVICED BY THE NOR­CARCLINA COASTAL MANAGEMENT PRCGPA. , THROLGH P,NCS PRCVICEJ BY THE COASTAL ZONE MANAGE>E ACT OF IST2. A=ME`ICEJ.'WITCH S ACMIN15TERE2 SY THE OFFCE CF OCEAN AND CCAST>L RESOURCE MANAGEMENT, HATIONAL OCEANIC AND ATMOSPHEPIC ADMINISTRATCN, i.ri`�i '� - yq"�$ ).e� '� fi!a v.•,�,; �7� � - t ii. �L �i t. �1� h�->'.. `.YD 4 ��.� � ? �>.. �{�3 a "F . 4•+�'s,.::� ; , tya-•'ir yet -s: i'�i�e :' �hs S� r3 7�,,.. S•'��. ''� t �� aL � 3,;�'{"f ��c. t�}r��,� �?„�,'3�ifr•?� u Y `�', ��� 3� 4;)� �c � .i 21 ta�.'.�'%�4'"�3+�Y�,'1 „�z �����'l . �t+f'•`'�R'` �i�aV�i^�-�`+.Y^' '.b r} .s34` 1 - �,• a r ,rs.S..� 'a''t'gk � an r s,.�.s+;y, € ' •'� ,, 's* i f F ,° K t y ♦y y „ , • i r` 'r� ♦♦ tt �i�i— �-� �.J :: in' r• ' ./�}, •rly? y�"fu �,5-`�" ��-.i" d i?� � j , z��� s � a �:+r - y� �'� • 4Cf. ,,ns- r+. � ��` ,, +. . r p i 4 t ► �y �1 .fib s , � ,��'� p'� .p.: $ ^ 3 j.�" a ♦ fit is.c^y'fi i i c+^. wk LIA �a 0,> tad % < ',� © � 4 +-- Fb � '� $,: • " �" t , Y>�'y� pQ'.' {?rt� If 17 "EVo�:.�'=S \` d•� a ��. s? .'<3 ....��r'�0i F ;i��rT"1Cf ... A ,�,�i, _ - _ ;X:;lfi+" 0 > r'y � r hz: r f% J �/ E E,613,000 E E,E I♦,000 E E.E C,000 4 LEGEND GENERAL NOTES I NAP COAPILED BY STEREOPMOTOGRAAMETRIC METHODS IN ACC 0ROANCE WITH NATIONAL MAP ACCURACY STANDARDS. E GR-D BASED ON NORTH CAROL IA STATE PLAN COORDINATE SYSTEM SOUTH :ONE 192' 1. A 11ATUM VERTICAL LATLM 1929 G A. S CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. ♦ TOOOGRAPHIC MAP PREPARED Of LANDMARK ENGINEERING COMPANY INC PO BOY BSB CARPI N.C. ERO"ECT NG. 96110 PNOTOGRAPNY D♦TE uARCM, 1916 SCALE I Inch . IOC fRP1 100 C O CONTOUR INTERVAL-2 FOOT _ S HIGHWAY p NRN GE �Y INIEAS+ARE N1GNW41 O CA— N . STATE 14.1-1 O INDEX SECONDARY ROAD SR 15k3 INYEHMETIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR TOWN LIMIT -- -- DEPRESSION CONTOUR `—-- SPOT ELEVATION A 169 NEW CATCH BASIWINLET DRAINAGE BASIN LIM — A — A— EXIST CATCH BASINIWLET DRAINAGE SUB -SAS" LIMIT —G—L— NEW MANHOLE NEW STORM DRAIN LINE EXIST MANHOLE EXIST. STORM DRAIN LINE �= _= DEPFCS10W PECIURGF AREiL��� RE EC_•=_E Y-\_,=VC1 .. �N-_ „_--.\.. A.. �iNCSrtr�IC A: MwLS'R_T:ON. tc •mot f�'���� ` -i r .. 41 31 f yA • i � l� . z5a'• h 3 _ �, � , -'py) pr d_• =' , rr { i f' S r4 ry s�' _ :=tom .. _'' ... f._ % v�' - '�` � •- A f �' �G. i ��' r�- i y °j �'� � i"i 'ipr':"• i�t p '1vK ., •. `�?�•+ � ; _ �� • —� ��;� �„�- .fib •-Q t :.'� : r � :tXf/"+.: .� t � � as�•#t,. 'f��,��;:' t...- •.,;a-. .• �.+ ..'-� �'.n ero tsti ""+�4r$. :,,�AA..` r� 4 F{ l �"1' .w ��.y �'! � � �` `'� '+�.- •. �c• # lam. .,� nr:<+• `��,-a3. as + • 1 _ +'i .—�c.� �F q r �'. �l "C3S.: r'�' Fs >:r' c.r !" r Y '�: •.+. .=� ( ' �- �., t �" �+ � ° •' _ fit, E :• ,ti� � �', '� 1 � ..are-'+' ' �� � .� _, �J(� � � �'O' �ft• ��. »q t i� � �K • 1.•i' � 'tY" � K� �f�'� _ .Y% 1 - YY r_ I _.. 1. ft f � /1 1, ._. ry-�iri ��� j ., / y.l�Ar../. .0 f rti ��r-� ✓j. 4 � j:z, s _ - .. " '. /..-,i �--�i .� r/.�lr/ram%�'=rl�l-��,r�-Y%r.�.lsrt%�%-%��,.,�✓�:� ���_y�_��.�' :�-`� �.. ..^r _.. ?�. �• Z... ., ., 7 W a j ; Z ui w (D W a - J W Zl--�— 000'c.c h MATCH SHT. 43 E2.619,000 E2,620,000 � -F-Ety�-` lig_ A. OR - �. ,` '- 5:.. ��� .� •A. -� 1, � � il.-� v�'�-' �!` iv.✓�-ems '�'!'� � .p E � J' „f•i••. •,�.Ed�wl yr•.. �'�r .+-�ri S •�'' � � I• l u, r •.•r�. ,� Y. %'•-�. t.M-. �•Pe.� %s.,-1S ;i� ♦ 'Y �yM'"- aI ;�j �-•- _ .. ST%a` .Y" !� �11.��,fii! 3 t'��_.•*1.1 S � � �.• 2+- _ .ice -` � �� -.<tY Yy�,.(�; -ate. I/RJ[ 1 O M • _ N � 1 .• _ j{" ,_ - sf•- � �ai14,.yH' �S+IyL M'` X +` I',•' f •tE'� . ] '- __�� �' _� `I-1. ,�z- ... -'. •... 6/ RL T �y6�1..,'`'. - . " F`,:@fi"..-A,.z s ;�,.�: _ _ '� • r� % 's� "}' �, � - .,�"'B'�,t'� to o _ _ s t3 +�y"C r- 6 2N.. r.F•^ x'*'or, - F s;�` •` B �' -� •Ys �' � ,�.+ �'" • xM t 'F r _ ', .,z � !iota-•'� ��, x Qr— VA y{ !r a>;'a� �y'E�'FN'x�'• +kL"'���F777. 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S Yr �r/:-1 � I '� 'r• R� "„ ...��' �t/7'�✓� ; �.. - •s'"� /w f...��a�S.T,• '^'�' .+v'l3r' "�4i' ��t� a:."r•+ r :i._fFE�i `.:LnE� �1 .�i.�rtirt3�� .. .._- .. .. - .. , _ ._. _...-�-...e..•._.-.ti`2.::'s>.�`..�i�..."3*:.•L N GENERAL NOTES •.IAP - o E, Y S-E-E-e_ _..:vvIT. - vE--'.: ACCCROAVCE — NA•:NA_ A:T,m.-, A. a .- .. i. r 3A5Er` .a NJw•N a_ - ♦ ,. - .ATE ]. _..NTOURS ARE—ER.MPCSEO .N al JR`NORN;T,i bAiE ♦ —' GPAPH,C VAP RRr opgfJ 9• E•a;�t.(FPIVG C IMPAN1 „ PO BCA fl. I HO-ECT .f —.0 PN,T^-A— -:Tf -.A,-,. .en SCALE I—, et 100 D l... _ 3-0 CONTOUR NTFRVAL-2 FOOT LEGEND .I S N.C.— 6Q I,RUGE �1 INEERSTATF HI -WAY O -A— ., I 514,1E NICHWAY Q INDEX IONT.UR SECONDARY ROAD SR IP2S INTENMECIATE CONTOUR STREAMS B SHORELINE - APPROXIMATE CONTOUR TOWN LIMIT DEPRESSION CONTOUR SPOT ELEVATION I .6.8 NEW CATCH BASIWINLET DRAINAGE BASIN LIMIT —A—A— EXIST CATCH BASIN/INLET DRAINAGE SUB -BASIN LIMIT —A—A— NEW MANHOLE NEW STORM GRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE �= __ 'EPREiS10N/RECHA AGE ARE., E RP —a TCH CF TN S MAP WAS FIIA.NCEO IN PART'wRq H A GRANT O :EJ HE NORTH -C.RCL > AS Al- NAGAMENT PRCGRAN , '. WG F' CS FRCv EEJ BY TI'E CO S AL ZONE MANAGE,EVT ACT OF IS73, AS E -ICN IS >OWNtSTEREJ E -,-E CF-'CE ,F OCEAN AND CCAi'AL R_SOUR-_ ..N_vZMEYT, NATIGNAL OC_ N C AND ATkOSRHERIC L'MINSTRATION E2,620,000 E2,621,000 p N GENERAL NOTES I MAP COMPILED BY STEREOPHOTOGRANMETRIC METHODS IN ACC OROANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2 GRID BASED ON NORTH CAROL I NA STATE PLAN COORDINATE SYSTEM. SOUTH ZONE 1927 NA UATUM VERTICAL LATLM 1929 6 A. S. CONTOURS ARE SUPERIMPOSED ON AN ORTNOPHOTO BASE. TOPOGRAPHIC MAP PREPARED BY LA NDMARX ENGINEERING COMPANY INC P0. BOX 668 CA AY, N.C. {ROJECT NG. 06170 PHOTOGRAPHY DATE NARCM,1996 SCALE I In h - 100 1991 100 0 w 200 300 CONTOUR INTERVAL-2 TOOT LEGEND L S HIGHw4Y � ^�Q HRILGE ,� T—� I-ERS TALE HIGIIW_T \ UI SWAMP .. N L STATE HIGHWAY O INDEX fONT.UR —o,— SECOHOARY ROAD SR I523 INTENMEDIATE CONTOUR STREAMS B SHORELINE _ APPROXIMATE CONTOUR TOWN LIMIT ----- DEPRESSION CONTOUR 1•—f� SPOT ELEVATION i IS NEW CATCH BASIN/INLET DRAINAGE BASIN LIMIT —A—•— EXIST CATCH BASIN/INLET DRAINAGE SUB -BASIN LIMIT —p—p— NEW MANHOLE —t-- NEW STORM DRAIN LINE EXIST MANHOLE =——_ EXIST. STORM DRAIN LINE � = = — DEPRESSION/RECMARGC AREf. C �� Q , _ _ _ _ _ _ YCE_ V ___ _-%,- A _ _ C--ML— C _ = c : y V STEREC E `Cl­_ ..., V.V_ a__„EV_NT, % T.uV. =F, N'CA.ND _T.MCS%-EBC A--Ml._ n-T.C\. MATCH SMT. 46 via 5 Y. J4 =r/Z-41^N.4q W *11 i #II a a Ux< 11 a J W Z o< aLLI ark W 3 m x -SYn Q w o W z z .- `r m Z o W z W = ui ui = Yl m Ld W O w - n J ✓' I • a II '�'Y. i Z Wi 12 W9 m w 3 _ J _ z�� o o r W Z�- ,n l• Z •- �- 6b '1HS Hol"I ' kr�7 a `�'r •`$ .I?'�k"'y,5ty ,e� , tr.. W #,�aJ .., f x +si. 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JY3�+da6i�u.�:>on.r'.�:aiiu tllsi � aSt,'iuu�.-t�LA�:ircit;�.t' t T „s*\4, ri .,�� 9t" yl'la�tdy0. �'1'k` q r^' "'.`r,.i`>th. d r• ty `�. �1� tj �''t\Yt� R . � m I r�� ¢ N,1���'�.{��e �.t✓n�1 ��„� Tr�t�`'M1t°��=.a`1 �r���4�� � 1 �"�1 � �ti1 1����\� �`;J ��'�.'1�'�t+� �yt�i �t , �'�+�', r���t'�t '�_ �1� y � i''1• Y1�{"iv*fit T .� �" ��y�i_\.t> 1�� ��` •.��:�`t �', r` � .�� Y . f„�T��'ilfl :•ii!'R �ytt �4.t ` �S' ���1, �.��� `ll\ HO gRolm Nk k �M y1 F t •xri •M C� 0oc':taN 000'tt[N 91, '1HS HD1tlW 0001¢tcN EL.C26,000 E2F24.000 E2.627.000 D N GENERAL NOTES 1. MAP COMPILED BY STEREOPMOTOGRAMMETRIC METHODSIN ACCOROANCE WITH NATIONAL MAP ACCURACY STANDARDS. 2, GRID BASED ON MORTM CANOLINA STATE PLAN COORDINATE SYSTEM. SOU IN ZONE 1927 N.A. UATUM VERTICAL DATUM .929 G.A. 3. CONTOURS ARC SUPERIMPOSED ON AN ORTHOPMOTO BASE. R. TOPOGRAPHIC YAP PREPARED BY LANDMARX ENGINEERING COMPANY INC. P.O. BON 668 CARY. N.C. FROAECT NO. 661T0. PHOTOGRAPHY DATE UAACH,13116 SCALE+ 1 s- • 100 /33I 100 O IW 200 �QO CONTOUR INTE-L-2 FOOT LEGEND O S HIGHWAY 6^Q RRIAGE �1 INTERST.TE HIGHWAY C,P SWAMP N.C. STATE HIGHWAY Q INDEX TONT,UR --,- SECONDARY ROAD SR 1U3 INTENMEDIATE CONTOUR STREAMS 6 SHORELINE APPROXIMATE CONTOUR TOWN LIMIT ---- DEIRE5510N CONTOUR SPOT ELEVATION A 16.8 NEW CATCH BASIWINLET �- DRAINAGE BASIN LIMIT - A- EXIST. CATCH BASIN/INLET _ =RD� P� DRAINAGE SUS -BASIN LIMIT -A-A- NEW MANHOLE � NEW STORM DRAIN LINE EXIST. MANHOLE EXIST. STORM DRAIN LINE � = _ = DEPRESSOR / RECHARGE AREA THE PEEP-RA-CN CF 7:15 MAP WAS FiNANCEO IN PART THROUGH A GRANT PF.OVICED SY THE VORTH C-aOLIN- COSS-AL MAN-GEVEVT 15CG-V , Tr R-1 F_NCS PP'.'ltCEO BY THE COASTAL ZONE -A EVE T ACT CF 572. AS-.VE:VCEO. WMCH IS-CMINISTE.RED BY THE O-CE CF OCEAN AND COAST-L RESWBCE M.:NAGENENT, NATIONAL OCEANIC AND ATMOSPHERIC AOMNST-CN. E 21928,000 E2.62P,000 N GENERAL NOTES P COMPILED BY STERE-.CTOGRCMMETRIC METHOD; I. ACCORDANCE WITH NATIONAL MCP ACCURACY STANUANDS X, GH-D BASED On MORTH CANOLINA STATE PLAN COOHDPIATE SYSTEM. SOUTH LONE IS2' N A UCT UN VERTICAL LATLM 1929 6 A S. CONTOURS ARE SUPERIMPOSED ON AN ORTHOPHOTO BASE. TOPOGRAPHIC MAP PREPARED III LANDMARX ENGINEERING COMPANY INC. P0. BOX 666 GAf Y, M.C. 1 NO'ECT N0. B61T0 PHOTOoRAANY DATE MARCH, 13$6 SCALE I ,n Ln _ IOC I 1 Io^ C ro0 22, _ 3 0 CONTOUR INTERVAL-2 FOOT LEGEND .5 HIG... I 60 NRII GE IN+EFSTA IE HIC.Hw:Y Q _ 11 _ STATE HIGHWAY Q INDEX rONT. OF SECONDARY ROAD SR lSk3 1NTE MMf CIATE CONTOUR STREAMS B SHORELINE APPROXIMATE CONTOUR --.... TOWN LIMIT DEPRESSION CONTOUR SPOT ELEVATION X .6.6 NEW CATCH BASIN/INLET DRAINAGE BASIN LIMIT —A—A— EXIST. CATCH BASIN/INLET == DRAINAGE SUB -SAS. LIMIT —AAA— . NEW MANHOLE NEW STORM DRAIN LINE EXIST MANHOLE EX IST. STORM DRAIN LINE —= _= DrPRFDR^'+/HFLHAHCE ARCA��� 'A::CN CX THIS MAP WAS FINANCED IN PANT THPCWH A GRANT 'n CAROLIN'A COASTAL MANAGEVENT RN:GPAV , T.HR': G� Fr:,:! % V::E: By THE C'vASTAL :ONE MANAGEVE%T ACT OP -2, 1—H IS AOM111ISTEREO EY THE OFFICE f OCEAN AND CCAS:AL P._5_J A .�A­—EVENT NATIONAL OCEANIC AND ATMOSPHEiIC AD—M. TION. APPENDIX B CLIMATIC SUMMARY rr r r r rr rr �r rr rr rr r� rr rr rr rr rr r � r DEG MIN DEG MIN 315830 MOREHEAD CITY, NC LAT: 34 44N LONG: 76 44W PERIOD: 1951-80 FREEZE DATA I GROWING DEGREE UNITS TO SELECTED BASE TEMPERATURES (F) PROBABILITY OF LATER DATE IN SPRING (THRU JULY 31) THAN INDICATED(*) BASE I GROWING DEGREE UNITS SPRING FREEZE DATES (MO/DAY) _ 36 3116 3122 3/26 312E 4101 4/04 4/08 4/12 4/17 32 2/26 3/06 3111 3116 3120 3124 3129 4/03 4/11 28 1128 2/07 2/15 2/22 2/28 3106 3113 3/20 3/31 L 24 110 1/27 2/03 2/09 2/15 2/20 2116 3105 3/15 W 20 0/00 1/14 1/24 1/31 2/OS 2/11 2/16 2122 3/03 H 16 0100 0/00 0/00 O/00 1/12 1/24 2/01 2/09 2/19 PROBABILITY OF EARLIER DATE IN FALL (BEGINNING AUG 1) THAN INDICATED(*) FALL FREEZE DATES (MO/DAY) 1i 36 10122 10127 10131 11/03 11/01, 11/10 11/13 11/17 11/22 32 11/03 11106 11/12 11/16 11/19 11122 11/25 11129 12/05 28 11110 11/17 11122 11/26 11129 12103 12/07 12112 12/19 24 11/19 11/27 12/03 12/OB 12/13 12/18 12/23 12/29 1/06 W 20 11/28 12113 12/21 1/O1 1/10 //20 1/31 2/17 0/00 1— 16 12129 1/09 1/17 1/27 2/08 0/00 0/00 0100 0/00 PROBABILITY OF LONGER THAN INDICATED FREEZE FREE PERIOD IDAYSI _ FREEZE FREE PERIOD 1 1� 36 244 235 229 223 218 213 208 202 193 32 274 263 256 249 243 237 231 223 213 0. 28 317 302 291 282 274 265 256 246 253 = 24 340 327 315 306 29B 290 282 272 259 W 20 >365 >365 >36S >365 342 326 313 300 280 p.. 16 >365 >365 >365 >365 >365 >365 >365 346 331 (*)PROBABILITY OF OBSERVING A TEMPERATURE AS COLD, OR COLDER, LATER IN THE SPRING OR EARLIER IN THE FALL THAN THE INDICATED DATE. 0/00 INDICATES THAT THE PROBABILITY OF OCCURRENCE OF THRESHOLD TEMPERATURE IS LESS THAN INDICATED PROBABILITY. JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN M 223 221 411 649 924 1086 1232 1234 1069 808 500 292 8649 40 S 223 444 855 1504 2428 3514 4746 5980 7049 7857 8357 8649 M 125 125 271 500 769 936 1077 1079 919 653 358 175 6987 45 S 125 250 521 1021 1790 2726 3803 4882 5801 6454 6812 6987 M 58 58 154 352 614 786 922 924 769 500 230 92 5459 50 S 58 116 270 622 1236 2022 2944 3868 4637 5137 5367 5459 M 20 20 69 217 459 636 767 769 619 352 127 38 4093 55 S 20 40 109 326 785 1421 2188 2957 3576 3928 4055 4093 M 4 3 21 109 307 487 612 614 469 216 55 11 2908 60 S 4 7 28 137' 444 931 1543 2157 2626 2842 2897 2908 M = MONTHLY DATA S = SUM OF MONTHLY DATA IGROWING DEGREE UNITS FOR CORN 0 M 112 113 221 389 617 778 900 897 760 520 290 157 5754 N S 112 225 446 835 1452 2230 3130 4027 4787 5307 5597 5754 NOTE: FOR CORN THE BASE IS 50. AND THE DEGREE UNITS ARE ADJUSTED FOR TEMPERATURES BELOW 50 AND ABOVE 86 OTHER CLIMATOLOGICAL DATA ARE AVAILABLE IN A VARIETY OF SUMMARIES AND FORMATS, SUCH AS THE CLIMATOGRAPHY OF THE UNITED STATES: NO. 60 — CLIMATE OF STATES: NO. 81 = MONTHLY NORMALS (AND SUPPLEMENTS: ANNUAL DEGREE DAYS TO SELECTED BASES DERIVED FROM THE 1951—.80 NORMALS: AND MONTHLY PRECIPITATION PROBABILITIES, SELECTED PROBABILITY LEVELS DERIVED FROM THE 1951-80 NORMALS): NO. 84 — DAILY NORMALS: NO. 65 — DIVISIONAL NORMALS. A VARIETY OF DATA IS AVAILABLE EITHER ON MAGNETIC TAPE, MICROFICHE, OR PAPER COPY. TO OBTAIN INFORMATION ABOUT CLIMATOLOGICAL DATA AND RELATED PUBLICATIONS, CONTACT: . DIRECTOR NATIONAL CLIMATIC DATA CENTER FEDERAL BUILDING ASHEVILLE, NC 28801-2696 (OR TELEPHONE: 1704) 259-06821 ',M1 0, o° DEPARTMENT OF COMMERCE +: '% NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION NATIONAL ENVIRONMENTAL SATELLITE, DATA, AND INFORMATION SERVICE NATIONAL CLIMATIC DATA CENTER ASHEVILLE, NC USCOMM-M0114-4SHCV1LLc, MC 7/04/200 CLIMATOGRAPHY OF THE UNITED STATES NO. 20 MOREHEAD CITY, NC I CI I MATni nr.I CAI S IIMMARY PERIOD: 1951-80 ELEVATION 10 FT TF:MPFRATUR I.Q ��S IIN.H CI _ MEANS EXTREMES MEAN NUMBER DEGREE DAYS * * SNOW MEAN NUM ER M I N* * *MA * ¢ ¢ L > J >• J s J lA ff 0 n lil j 3 L "S 0 2 (7 Ul Z .O (7 to .D > J } L> J J L F W O Ir J L J i S 1.) tl r R >' O O Z O .Z-. Z rt W 1- Q Q la 1- J Q at r Z Q E `t M O O ~ O U Z a1 W 4 O 41 U 3 4 W Q Q O (1 J a J Q J 1- 1.1 1 1.1 W - 4 1' W Q W Q W 1=- W O (J i Z W O >- O W O > O O ai N N O m W¢ O Q Ln z W 0 > W o >• O S 4 0 > O O `� tr 0 4 L O Z O L ¢_ !Y J 0� Q (") m M m 1 m U m L S L !!1 O Lo O JAN 54.5 J6.4 45.5 75+ 53 20 9+ 77 17 0 0 12 0 610 6 4.13 9.55 79 4.10 78 20 .7 8.1 65 6 2 1 FEB 55.9 37.0 46.5 77+ 80 23 10 79 10 0 0 9 0 51,8 0 3.99 9,14 72 3.83 72 13 1,0 16.0 73 5 2 1 MAR 62.1 43.6 52.9 86+ 74 10 12+ 80 3 0 0 4 O 385 10 3.69 6.47 8O 2,18 66 16 1.1 22.0 80 6 2 1 APR 70.5 52.3 61.4 90 80 23 27+ 72 10 0 0 0 0 128 20 2.90 5.81 58 2.35 61 12 .0 .0 4 2 1 MAY 77.8 61.2 69.5 96+ 53 26 37+ 68 8 0 0 0 0 19 158 4.24 9.42 72 3.55 54 14 .0 ,0 6 3 1 JUN 83.4 ;.J.5 76.0 107 52 26 48+ 77 8 2 0 0 0 0 330 4.57 10.24 66 8.50 64 11 .0 .0 5 2 1 86.5 72.5 79.5 97* 78 21 54+ 75 2 4 0 0 0 0 450 6.57 10.76 66 4.55 51 25 .0 .0 4 2 .JUL AUG 86.7 72.4 79.6 96+ 68 21 55 79 17 6 0 0 0 0 453 6.19 22,45 55 12.43 55 12 .0 .0 17 7 3 2 SEP 83.1 67.7 75.4 94 52 14 44+ 70 30 2 0 0 0 0 312 5.26 21,42 55 10,90 55 20 .0 .0 5 3 2 OCT 74.8 56.8 65.8 90+ 54 5 27+ 76 29 0 0 0 0 69 94 3.77 11.44 71 7.02 68 20 .0 .0 4 2 1 NOV 66.2 46.5 56,4 82+ 77 5 19+ 76 9 0 0 3 0 269 11 3.39 7.74 72 5.55 52 22 .0 .0 5 2 1 DEC 57.9 38.9 48.4 76+ 78 8 14+ 62 13 0 0 9 0 515 0 3,96 11,Q8 73 5.90 80 281 3 5.0 58 5 2 1 JUN JAN AUG AUGM 129 YEAR 71 6 54.5 63. 1 107 I 52I 2d 9 1 77I 171 14 I 0 1 37 1 0 I 2513 I 1844 152.661 _22.45I 551 12.43� 55I 121 3. 1� 22.O80 65 15 *FROM 1951-80 NORMALS u ESTIMATED VALUE BASED ON + ALSO ON EARLIER DATES. DATA FROM SURROUNDING STATIONS DEGREE DAYS TO SELECTED BASE TEMPERATURES (F) PROBABILITY THAT THE MONTHLY PRECIPITATION WILL BE BASE HEATING DEGREE DAYS EQUAL TO OR LESS THAN THE INDICATED PRECIPITATION AMOUNT MONTHLY PRECIPITATION (INCHES); BELOW JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN nFf 65 610 518 385 128 19 0 0 0 0 69 269 515 2513 464 390 252 43 0 0 0 0 0 17 151 372 1689 •05 1.26 1.35 1.28 .61 1.53 1.26 1.75 1.31 1.25i' .58 .76 .92 60 V) t0 1.65 1.73 1.63 .88 1.93 1.69 .2.37 1.88 1.74 .89 1.07 1.29 57 382 315 186 15 O 0 0 0 0 7 100 291 1296 -J W .20 2.24 2.28 2.14 1.31 2.51 2.35 3.32 2.79 2.51 1.44 1.57 1,87 55 221 269 173 7 0 0 0 0 0 0 70 141 1631 w .30 2.74 2.75 2.56 1.69 2.99 2.92 4.16 3.61 3.19 1.96 2.02 2.39 50 221 173 73 0 0 0 0 0 0 0 21 143 631 -i } ,40 3.23 3.19 2.97 '2.08 3.45 3.49 4.98 4.44 3.88 2.50 2.46 2.91 BASE COOLING DEGREE DAYS '- .50 3.73 3.66 3.39 2.49 3.92 4.08 5.84 5.33 4.60 3.09 2.94 3.46 f-: •60 4.29 4.16 3.85 2.96 4.43 4.73 6.79 6.33 5.41 3.77 3.47 4,07 ABOVE JAN FEB MAR :':DR MAY JUN JUL AUG SEP OCT NOV DEC ANN cn a .70 4.95 4.75 4,38 3.52 5.02 5.50 7.93 7.53 6.37 4.67 4.77 4.81 55 36 31 84 199 450 630 760 763 612 338 112 37 4052 0 ,gQ 5.80 5.51 5.07 4.26 5.78 6.51 9.41 9.11 7.64 5.72 4.95 5.77 57 25 21 59 147 388 570 698 701 552 279 82 24 3546 a .90 7.12 6.68 6.12 5.44 6.96 8.08 11.72 11.64 9.65 7.53 6.29 7.30 60 15 12 32 85 298 480 605 608 462 197 43 12 2849 .95 8.35 7.76 7.09 6.56 8.03 9.55 13.89 14.03 11.54 9.27 7.55 8.74 65 6 0 10 20 158 330 450 453 312 94 11 O 1844 70 0 0 0 0 64 187 295 298 174 28 0 0 1046 THESE VALUES WERE DETERMINED FROM THE INCOMPLETE GAMMA DISTRIBUTION. DERIVED FROM THE 1951-80 MONTHLY NORMALS rr it rr rr rr rr r rr r r r r r r r rir rr• r APPENDIX C EXISTING COASTAL AREA STORMWATER CONTROL REGULATIONS 15 NCAC 2H .1001-.1003; have been adopted as published in the NCR, Volume 2,*'Issue 4,_pages 250-253, with changes, as follows: SECTION .1000 - STORMWATER RUNOFF DISPOSAL .1001 STORMWATER DISPOSAL POLICY ' (a) The increase in stormwater runoff associated with land development activities can substantially increase inputs of.waste constituents present in stormwater to waters of the State over that which occurs in natural, undeveloped watersheds. The ' increased pollutant loading from stormwater, runoff may degrade ambient water quality, adversely impact best usage or otherwise violate water quality standards. For these reasons, it is the ' goal of the Commission to minimize any water quality impacts of development activities to ensure that existing and designated uses are maintained and protected in accordance with the ' provisions of this Section. In esta-bl•ish•ing this goal, the Commission recognizes that the U.S. Environmental Protection Agency will be establishing permit requirements and best ' management practices for stormwater point sources pursuant to the Federal Water Pollution Control Act as amended. (b) The rules in this section to control pollutants associated with stormwater runoff apply to development of land ' for residential, commercial, industrial, or institutional use but do not apply to land management activities associated with agriculture or silviculture. History Note: Statutory Authority G.S. 143-214.1; 143-215.3(a)(1); Eff. January 1, 1988. .1002 DEFINITIONS The definition of any word or phrase in this Section shall be the same as given in Article 21, Chapter 143 of the General Statutes of North Carolina, as amended. Other words and phrases used in this Section are defined as follows: (1) Development means any land disturbing activity which adds to or changes the amount of impervious or partially impervious cover on a land area or which .otherwise decreases the infiltration of precipitation into the soil thus altering the hydrological characteristics of the area. (2) Drainage area or watershed means that area contributing runoff to a single point measured in a horizontal. plane which i.s enclosed by a ridge line. (3.)_ Infiltration systems mean stormwater treatment systems designed allow runoff to pass or move (infiltrate) :nto the soil surface. (4) On -site stormwater systems mean the systems necessary to control stormwater w"ithin an individual development project. (5) Off -site stormwater systems mean the systems necessary to control stormwater from more than one development which is owned and operated as a duly licensed utility or by a local government. N (6) Built -upon area means that portion of an individual ' development project that is covered by impervious or partially impervious cover including buildings, pavement, recreation facilities, etc. but not including decking. ' (7) Redevelopment means any rebuiidin9 activity following fires, hurricanes or other natural disaster, or other public restoration projects designated by the , Commission; (8) Wet detention pond means a structure that provides for the storage and treatment - of runoff and includes -a ' permanent -pool of water. (9) Coastal Counties include Beaufort, Sortie, Brunswick, Camden, Carteret. -Chowan, Craven, Currituck, Dare, Gates, Hertford, Hyde, New Hanover, Onslow, Pamlico, Pasquotank, Pender, Perquimans, Tyrrell, and Washington. (10) Sedimentation/erosion control plan means any plan ' submitted to the Division of Land Resources or delegated authority in accordance with 15 NCAC 46 .0005. (11) CAMA major development permits mean those permits , required by the Coastal Resources Commission according to 15 NCAC 7J Sections .0100 and .0200. (12)- Vegetative filter means an area of natura-1 or planted ' vegetation. through which stormwater runoff flows in a diffuse manner so that runoff does not become channelized and which provides for infiltration of , runoff and .filtering of pollutants. The direction of stormwater flow defines the width of the filter. (13) Stormwater collection system means any pipe, channel, curb or gutter for the primary purpose of transporting ' (not treating) runoff but does not include grassed swales, or pipes used to carry drainage underneath built -upon surfaces that are associated with , development controlled by the provisions of Rule .1003(a)(2) and (3) in this Section. , History Note: Statutory Authority G.S. 143- 214.1; 143-215.3(a)(1); Eff. January 1, 1988. , .1003 COASTAL STORMWATER DISPOSAL (a) Applicability. The intent of the Commission is to achieve w the water quality ' protection which low density development near productive coastal waters would provide. To that end, the director by applying the standards in this Rule will cause development to cr.:"ply with th•, ` anticeg radation requirements specified in 15 NCAC 2B .0201 by protecting high quality waters and highly productive aquatic resources from the adverse impacts of uncontrolled high density development or the potential failure of stormwater control measures. Stormwater control measures as described , in Paragraphs (c) through. (1) of this Rule are required for any development activities in the coastal counties which require a CAMA major development permit or a sedimentation/erosion control plan.After January 1, 1988 unless the development: -(1) is one acre or less; (2) drains to SA waters o' unnamed tributaries to SA waters; has a built -upon area of 25% or less, or proposes development of single-family residences on lots with one-third of an acre or greater with a built -upon area of 25% or less; has no stormwater collection system; and built -upon area is at least 30 feet from surface waters; (3) drains to waters other. than SA; has a built -upon area of 30% or less, or proposes development of single-family residences on lots with one-third of an acre or greater with a built -upon area of 30% or less; has no stormwater collection system; and built -upon area is at least 30 feet from surface waters; (4) controls runoff through an off -site stormwater system meeting provisions of this Rule and permitted in accordance with G.S. 143-215.1(d); (5) is redevelopment which meets the requirements of this Rule to the maximum extent practicable; (6) otherwise meets the provisions of this Rule and has boat ramps, public roads and public bridges which minimize__ impervious surfaces, divert stormwater away from surface waters as much as possible and employ other best management practices to minimize water quality impacts; or (7) is certified by the Director that the site is situated such that water quality standards. and uses are not threatened and the developer demonstrates that the development meets the follow.i*-ng criteria: (A) the plans and specifications -indicate stormwater control measures which will be installed in lieu of the requirements of this Rule, or (B) the development is located such a distance from surface waters that impacts from pollutants present in stormwater from the site will be effectively mitigated; Development designed to meet the low density requirements in subparagraphs (2) and (3) of this Paragraph must demonstrate that no areas within the project site are of such high density that stormwater threatens water quality. Deed restrictions and protective covenants used to ensure that subdivisions maintain the development consistent with the plans and specifications approved by the -division will include the State as a beneficiary of the ~estrictions. (b) Projects with stormwater control measures in accordance with the provisions of this Rule shall be deemed permitted pursuant to G.S. 143-215.1(d) upon receipt of a permit from the Division of Coastal Management or plan approval from the Division of Land Resources (or delegated authority). In addition, NPDES permits for stormwater point sources may be required according to the provisions of 1S NCAC 2H .0126. (c) Stormwater Control Options. Stormwater control measures which can be approved pursuant to this Rule and which will not be considered innovative include: (1) Stormwater infiltration systems including infiltration basins/ponds, swales, and vegetative filters; and (2) Wet -detention -ponds. (d) Innovative Systems. Innovative measures for controlling stormwater which are not well established through actual experience may be approved on a demonstration basis under the following conditions: (1) There is a reasonable expectation that the control measures will be successful; (2) The projects are not located near high quality waters; (3) Monitoring requirements are included to verify the performance of the control measures; and (4) Alternatives are available if the control measures fail and will be required when the director determines that the system has failed; No more than five projects utilizing the same innovative control measure will be approved until: the technology is proven over a - time frame to be determined -on a case -by -case basis. These five projects will include projects approved since November 1, 1986 according to the provisions of 15 NCAC 2H- .0408. (e) Design Criteria for Development Draining to Outstanding Resource Waters. Stormwater control.requirements to protect coastal waters classified as Outstanding Resource Waters (ORW) pursuant to 15 NCAC 28 .0216 shall be determined in the process to reclassify the waters as ORW. After the Commision has received a request to classify Class SA waters as ORW and given permission to the director to schedule a public hearing to consider reclassification and until such time as specific stormwater design criteria become effective, only development which meets the requirements of Paragraph (a) (2), (5) of ( will be approved within 575 feet of mean high water of these waters. (f) Design Criteria for Development draining directly to Class SA waters. (1) Direct outlet channels or pipes to SA waters are prohibited unless permitted in accordance with 15 NCAC 2H .0126. (2) Infiltration control systems must be designed to. control the runoff from all impervious surfaces generated by one and one-half inches of rainfall. The size of the system must take into account the runoff from any pervious surfaces draining to the system. (3) Runoff in excess of the design volume must flow overland through a vegetative filter with a minimum width of 50 feet measured from mean high water of 5A waters; (g) Design Criteria For Development Not Draining to SA Waters. (1) Infiltration control systems must be designed to control the. runoff from all impervious surfaces generated by one inch of rainfall. The size of the system must take into account the runoff from any pervious surfaces draining to the system; - - I 11 7 u 11 7 (2) Wet detention -ponds must be designed according to methods approved by the director for 85 percent removal of total suspended solids in the permanent pool and storage of runoff from a one inch rainfall• from the site above the permanent pool; (3) Vegetative filters are required for the overflow and discharge of all stormwater from wet detention ponds; these -filters shall be at least 30 feet in length; (4) Additional control measures may be required'on a case -by -case basis to protect high quality waters or specific water uses. (h) Infiltration System -Requirements. Infiltration systems may be designed to provide infiltration of the -entire design rainfall volume required for a site or a series of successive systems may be utilized. Infiltration may also be used to pretreat runoff prior to disposal in a wet. detention ponds. The following are requirements: (1) Infiltration systems shall be a -minimum of 30 feet -from surface waters and 50 feet from Class SA waters; (2) Infiltration systems shall be a minimum distance of 100 feet from water supply wells; (3) The bottom of infiltration systems shall be a minimum of 2 feet above the seasonal high water table; (4) Infiltration systems must be designed such that runoff in excess of the design volume by-passes the system and does not flush pollutants through the system; (5) Infiltration systems must be designed to completely draw down to pre -storm levels within 5 days and a hydrogeologic evaluation may .be required to determine whether the system can draw down in 5 days; (6) Soils must have a minimum hydraulic conductivity of 0.52 inches per hour to be suitable for infiltration; (7) Infiltration systems must not be sited on or in fill material;. (8) Infiltration systems must have an observation well to provide ready inspection of the system; (9) If runoff is directed to infiltration systems during construction -.of the project, the system must be restored to design specifications after the project is complete and the entire drainage area is stabilized. (i) Wet Detention Pond Requirements. These practices can be used as a primary treatment device or as a secondary device following an infiltration system. Wet detention ponds shall be designed for a specific pollutant removal according to modeling techniques approved by the director. Specific requirements for these systems are as follows: (1) The deib"19n storage volume shall be above the permanent pool; (2) The discharge rate from these systems following the one inch rainfall design storm shall be such that the runoff does not draw down to the permanent pool level in less than 2 days and that the pond is drawn down to the permanent pool level within at least 5 days; (3) The mean depth shall be a minimum of 3 feet; (4) The inlet structure must be designed to minimize turbulence using baffles or other appropriate design features; (5) Pretreatment of the runoff by the use of infiltration swales is encouraged to minimize sedim#-ntation and eutroph-ication --of the detention pond. _ (J) Vegetative Filter Requirements. Vegetative filters shall be used as a non-structural method for providing additional infiltration* filtering' of pollutants and minimizing stormwater impacts. Requirements for these filters are as .follows: (1) A distribution device such as a Swale shall -be used to provi-de seven Ats'tribution of runoff over the length of the vegetative filter; (2) The slope and width of the vegetative filter shall be determined so as to provide a non -erosive velocity- of flow -through the filter for a 10-year, 24-hour storm with a 10-year, 1-hour intensity and the portion of the filter representing the minimum filter width specified in Paragraphs (f) and (g) of this Rule shall have a slope of 5% or less; (3) Vegetation in the filter may be natural vegetation, grasses or artificially planted wetland vegetation appropriate for the site characteristics; (k) Operation and maintenance plans. An operation and maintenance plan or manual `shall be provided by the "developer for stormwater systems, indicating what operation and maintenance actions are needed, what specific quantitative criteria will be used for determining when those actions are to be taken, and who is responsible for those actions prior to approval of the development by the division . The plan must clearly indicate the steps that will be taken and who will be responsible for restoring a stormwater system to design:* specifications if a failure occurs and will include an acknowledgement by the responsible party. Development must be maintained consistent with the requirements in these plans and modifications to these plans must be approved by the Division. (1) System Design. Stormwater systems must be designed by a North Carolina regi.stered.,.pr_ofessional with qualifications appropriate for the type of system required; these registered professionals are defined as: (1) professional engineers; (2) landscape architects, to the extent that the General Statutes, Chapter 89A, allow; and (3) registered land surveyors, to the extent that the design represents incidental drainage within a subdivision, as provided in General Statute-89C-3(7). Upon completion of construction, a registered professional appropriate fo*r the type of stormwater system designed must certify that the system was inspected during construction and was constructed in substantial conformity with plans and specifications reviewed by the division and complies with the requirements of this Rule. u [1 1 History Note' Statutory Authority G.S. 143-214.1 .143-215.1(d); 143-215.3(a)(1); Eff. January 1. 1988. 15 NCAC 2H .1004; has been adopted as published in the NCR, Volume 2, Issue 4, page 253, as follows: .1004 STATEWIDE STORMMATER GUIDELINES The division will periodically develop guidelines for the - control of stormwater pollution from various development practices and to protect specific water uses; these guidelines will be provided to requesting individuals, institutions, local governments, or state/federal agencies on request -for use in developing control strategies for mitigating stormwater pollution. History, Mote: Statutory Authority G.S. 143-214.1; 143-215.3(a)(1); 143-215.8A; Eff. January 1, 1988. APPENDIX D MODEL STORMWATER CONTROL ORDINANCE FOR EMERALD ISLE NORTH CAROLINA - NOTE: The following draft ordinance is based in part on the following source document: Frank E. Maloney, Richard G. Hamann and Bram D. E. Canter. October, 1980. "Stormwater Runoff Control: A Model Ordinance for Meeting Local Water Quality Management Needs." Natural Resources Journal 20: 713-764. INTRODUCTORY NOTE: ' . _CQ.Ag_g$t_ .BgJ1jId._TJW MQ'Le.,_QrdiD_4=0: The presumption under- lying the Model Stormwater Control Ordinance is that land ' development can be accommodated on almost any site without resulting in irreparable damage to local water resources and the biological community. Land can and should be used in a manner that minimizes or avoids adverse environmental impacts. The ' choice is not between development or no development; it is be- tween wise development or destructive development. The Model Stormwater Control Ordinance was developed to encourage a more ' harmonious relationship between lard alteration for human use and the needs of the natural environment. The Model Ordinance is intended to require the implementation of stormwater runoff management practices that accomplish two basic objectives: ' 1. Protect the absorptive, purifying and retentive functions of natural systems including the unique interdunal trough groundwater recharge areas that exist ' on the site of a proposed development; and 2. Provide for post -development stormwater runoff characteristics that resemble the conditions that existed before the site's alteration. ' The Model Stormwater Control Ordinance is designed to be adapted to the unique characteristics of the Town of Emerald Isle. NC specifically and to other coastal area communities in general. It is presumed that some provisions of the Model Ordinance will be modified or possibly even rejected altogether. Other provisions may have to be added. Nevertheless, the regulatory..approach and the means that were formulated to accomplish stormwater runoff control in the Model Ordinance should greatly facilitate the creation of effective controls in areas ' where no controls presently exist and to meet the requirements of the NC Coastal Area Stormwater Regulations promulgated by the NC Division of Environmental Management. ' 1LE SECTION ONE: SHORT T1 This ordinance shall be known as the "Stormwater Control ' Ordinance for Emerald Isle, NC." SECTION TWO: FINDINGS OF FACTS The Board of Commissioners of the Town of Emerald Isle finds ' that uncontrolled drainage development of land has a significant adverse impact upon the health, safety and welfare of the community. More specifically, ' (a) Stormwater runoff can carry pollutants into receiving water bodies► degrading water quality and result in closures of ' shellfishing waters; (b) The increase in nutrients such as phosphorus and nitrogen accelerates eutrophication of receiving waters, ' adversely affecting flora and fauna; (c) Improperly channeling water increases the velocity of ' runoff, thereby increasing erosion and sedimentation; (d) Construction requiring the alteration of natural ' topography and removal of vegetation tends to cause a loss of natural recharge areas and increase erosion; (e) Siltation of water bodies resulting from increased ' erosion decreases their capacity to hold and transport water, interferes with navigation, and harms flora and fauna; ' (f) Impervious surfaces increase the volume and rate . of stormwater runoff and allow less water to percolate into the soil, thereby decreasing groundwater recharge; ' (g) Improperly managed stormwater runoff can increase the incidence of flooding and the level of floods which occur, t endangering property and human life; (h) Improperly managed stormwater runoff can interfere with the maintenance of optimum salinity in estuarine areas, thereby disrupting biological productivity; (i) Substantial economic losses result from these adverse , impacts on community waters; (j) Many future problems can be avoided if land is ' developed in accordance with sound stormwater runoff management practices. SECTION THREE: OBJECTIVES In order to protect, maintain, and enhance both the immediate ' and the long term health, safety and general welfare of the citizens of the Town of Emerald isle, NC this ordinance has the following objectives: , 2 ' (a) To encourage . productive and enjoyable harmony between humanity and nature; (b) To protect► restore and maintain the chemical, physical ' and biological integrity of the waters of Bogue Sound and the Atlantic Ocean; ' (c) To prevent individuals► business organizations and governments from causing harm to the community by activities ' which adversely affect water resources; - (d) To encourage the construction of drainage systems which aesthetically and functionally approximate natural systems; ' (e) To encourage the protection of natural systems and the use of them in ways which do not impair their beneficial ' functioning; (f) To encourage the use of drainage systems which minimize ' the consumption of electrical energy or petroleum fuels to move water► remove pollutants, or maintain the systems; (g) To minimize the transport of pollutants to area surface ' waters; - (h) To maintain or restore groundwater levels; (i) To protect, maintain or restore natural salinity levels in estuarine areas; ' (j) To minimize erosion and sedimentation; (k) To prevent damage to wetlands and to the local natural recharge areas known as interdunal troughs; (1) To prevent damage from flooding► while recognizing that natural fluctuations in water levels are beneficial; (m) To protect, restore► and maintain the habitat of fish and wildlife; and (n) To ensure the attainment of these objectives by requiring the approval and implementation of stormwater ' management plans for all activities which may have an adverse impact upon community waters. SECTION FOUR: DEFINITIONS ' Unless specifically defined below► words or phrases shall be interpreted as to them the meaning they have in common so give 3 1 usage and to give this ordinance its most effective application. Words used in singular shall include the plural and the plural , the singular; words used in the present tense shall include the future tense. The word "shall" connotes mandatory and not discretionary; the word "may" is permissive. (a) "Adverse Impacts" are any modifications, alterations or effects on a feature or characteristic of community waters or ' wetlands, including their qualityr quantityr hydrodynamics, surface area► species composition, living resources, aesthetics or usefulness for human or natural uses which are or may potentially be harmful or injurious to human health, welfare, ' safety or propertyr to biological productivity► diversity, or stability or which unreasonably interfere with the enjoyment of life' or property, including outdoor recreation. The term ' includes secondary and cumulative as well as direct impacts. (b) Clearing" means the removal of trees and brush from the land but shall not include the ordinary mowing of grass. , (c) "Detention" refers to the collection and storage of surface water for subsequent gradual discharge: ' (d) "Developer" means any person who engages in development either as the Owner or as the agent of an . Owner of property. ' (e) "Development" or "Development Activity" means: (1) the construction, installation. alteration. ' demolition or removalof a structure, impervious surface, or drainage facility; or ' (2) clearing, scraping, grubbing, or otherwise removing or killing the vegetation of a site; ' (3) adding, removing, exposing, excavating. leveling. gradingr digging, burrowingr dumping, piling, dredging, or otherwise significantly disturbing the soil, mud, sand or rock of a site. ' Cf) "Drainage Facility" means any component of the drainage system. ' ('g) "Drainage System" is the system through which water flows .from the land. It irca^des all watercourses. waterbodies ' and wetlands. (h) "Erosion" is the wearing or washing away of soil by the action of wind or water. ' 4 (i) "Flood"' 'is a temporary rise in the level of any ' waterbody, watercourse or wetland which results in the inundation of areas not ordinarily covered by water. (j) "Impervious Surface" means a surface which has been ' compacted or covered with a layer of material so that it is highly resistant to infiltration by water. It includes semi - impervious surfaces such as compacted clay► as well as most conventionally Lurfaced streets, roofs, sidewalks, parking lots and other similar structures. (k) "Natural Systems" means systems which predominantly consist of or use those communities of plants, animals, bacteria and other flora and fauna which occur indigenously on the land, ' in the soil or in the water. (1) "Owner" is the person in who is vested the fee ownership, dominion, or title of property, i.e., the proprietor. ' This term may also include a tenant, if chargeable under his lease for the maintenance of the property, and any agent of the Owner or tenant including a developer. (m) "Person" means any and all persons, natural or artificial and includes any individual, firm, corporation, ' government agency, business trust, estater trust, partnership, association, two or more persons having a joint or common interest, or any other legal entity. ' (n) "Predevelopment Conditions" are those conditions which existed before alteration, resulting from human activity, of the natural topography, vegetation and rate, volume or direction of surface or ground water flow, as indicated by the best available historical data. (o) "Receiving Bodies of Water" shall mean any waterbodies, watercourses or wetlands into which surface waters flow either naturally, in manmade ditches, or in a closed conduit system. ' (p) "Retention" refers to the collection and storage of runoff without subsequent discharge to surface waters. ' (q) "Sediment" is fine particulate material, whether mineral or organic, that is in suspension or has settled in a waterbody. ' r) "Sedimentation Facility" means any structure or area which is designed to hold runoff water until suspended sediments ' have settled. (s) "Site" means any tract, lot or parcel of land or combination of tracts, lots, or parcels of land which are in one ' ownership, or are contiguous and in diverse ownership where 5 1 t is to be performed as part of a unit, subdivision, or ' development p project. (t) "Stormwater Management Plan" refers to the detailed analysis required by Section Six for each activity described in Section Five of this ordinance. "Structure" (u) Structure means that which is built or constructed. an edifice or building of any kind► or any piece of work ' artificially built up or composed of parts joined together in some definite manner but shall not include fences or signs. (v) "Subdivide" means to divide the ownership of a parcel ' of landjp whether improved or unimproved, into three or more contiguous lots or parcels of land, whether by reference to a plat, by metes and bounds or otherwise. -or. if the establishment ' of a new street is involved, any division of a parcel of land. Subdivision includes a resubdivision and, when appropriate to the context, relates to the process of subdividing or to the land , subdivided. (w) "Vegetation" means all plant growth, especially trees, shrubs, vines, ferns, mosses and grasses. ' (x) "Waters" or "Community of Waters" means any and all water on or beneath the surface of the ground. It includes the water in any watercourse, waterbody or drainage system. It also ' includes diffused surface water and water percolating, standing or flowing beneath the surface of the ground, as well as coastal waters. ' (y) "Watercourse" means any natural or artificial stream, riverr creek, channel, ditch canal, conduit, culvert. drain, , waterway.. gully, ravine, street, roadway► swale, or wash in which water flows in a definite direction, either continuously or intermittently► and which has a definite channel, bed or banks. ' (z) "Waterbody" means any natural or artificial pond, lake, reservoir or other area which ordinarily or intermittently contains water and which has a discernible shoreline. , (aa) "Watershed" means a drainage area or drainage basin contributing to the flow of water in a receiving body of water. ' (bb) "Wetlands" means those areas where (1) tse soil is ordinarily saturated with water; or ' (2) the dominant plant community is one or more of those specifies designated by the U.S. Army Corps of Engineers as '. identifying wetlands. or the transitional zone of wetlands. , 6 ' SECTION FIVE: APPL I CAB IL ITY _ (a) All development within the Town of Emerald Isle must ' comply wit-h minimum stormwater control standards. All development must provide appropriate infiltration devices to control runoff of the first 1.5 inches of rainfall or less from all impervious surfaces onsite. Flow from gutters and downspouts ' shall be diverted to dry wells or porous drain pipes in rock - envelope. For structures without gutters and downspouts, gravel ' infiltration beds under roof overhangs shall be provided. Typical designs of appropriate systems will be provided for guidance in the manual of stormwater management practices (see Section 11). ' (b) Unless exempted pursuant to subsection (c) or waived pursuant to subsection (d), a Stormwater Management Plan must be Isubmitted and approved before: (1) a plat is recorded or land is subdivided; or ' (2) an existing drainage system is altered, rerouted, deepened. ' (3) building permit is issued. (4) development is commenced. (c) Exemptions: The following development activities are exempt from the Stormwater Management Plan Requirement: ' (1) the development of one (1) single family or duplex residential dwelling unit and accessory structures (such as fences, storage sheds and septic tanks) in an existing subdivision which does not involve the alteration or filling of an interdunal trough; ' (2) the development of one (1) single family or duplex residential structure not in an existing subdivision which does not invove the alteration or filling of an interdunal ' trough; (3) agricultural activity not involving the artificial drainage of land; ' (4) any maintenance, alteration, use or improvement to an existing structure not changing or affecting quality, rate, volume or location of surface water discharge. (d) Waivers: (1) A waiver of the Stormwater management Plan , requirement may be obtained by submitting an application on forms supplied by the Town of Emerald Isle. The application shall contain: ' (i) the name, address and telephone number of the developer and owner; and , (ii) a description and a drawing of the proposed development; and ' (iii) the location of the development; and (iv) any other information requested by the Town of , Emerald Isle that is reasonably necessary to evaluate the proposed development. (2) The Town of Emerald isle may grant waiver if the application demonstrates the development is not likely to: (i) significantly increase or decrease the rate or ' volume of surface water runoff; (ii) have a significant adverse impact 'on an ' interdunal trough, wetland, watercourse or waterbody; (iii) - significantly contribute to the degradation ' of water quality. (3) The following types of development shall not be eligible to receive a waiver; ' (i) shopping centers; (ii) commercial facilities ' (iii) subdivisions; (iv) roads; (v) impervious surfaces greater than 10400 square , feet. (e) Variances: The Town of Emerald Isle may grant a written variance from any requirement of this ordinance using the ' following criteria: �uppl (1) taere are special circumstances icabl a to the , subject property of its intended use; and, (2) the granting of the variance will not; (i) significantly increase or decrease the rate or volume of surface water runoff; , 8 ' (ii) have a significant adverse impact on an interdunal trough, wetland, watercourse or waterbody. ' (iii) significantly contribute to the degradation of water quality; - (iv) otherwise significantly impair attainment of ' the objectives of this ordinance. SECTION SIX: CONTENTS OF THE STORM.jniATER MANAGEMENT PLAN (a) It is the responsibility of an applicant to include in the Stormwater Management Plan sufficient information for the Town of Emerald Isle or its agents to evaluate the environmental characteristics of the affected areas, the potential and predicted impacts of the proposed. activity on area surface ' waters, and the effectiveness and acceptability of those measures proposed by the applicant for reducing adverse impacts. The ' Stormwater Management Plan shall contain maps, charts, graphs, tables, photographs, narrative descriptions and explanations and citations to supporting references, as appropriate, to communicate the information required by this section.. (b) The Stormwater Management Plan shall contain the name, address and telephone number of the owner and the developer. In addition, the legal description of the property shall be provided, and its location with reference to such landmarks as major waterbodies, adjoining roads, or subdivisions shall be clearly identified by a map. (c) The existing environmental and hydrologic conditions of the site and of receiving waters and wetlands shall be described 1 in detail, including the followings (1) the direction, flow rate, and volume of stormwater runoff under existing conditions and, to the extend ' practicable, predevelopment conditions; ' (2) the location of areas on the site where stormwater collects or percolates into the ground (locations of interdunal troughs) as shown on the topographic maps of the Town which are on file at _Town Hall; (3) a description of all watercourses, waterbodies and wetlands on or adjacent to the site or into which stormwater flows. Information regarding their water quality and the ' current water quality classification, if any, given them by the NC Division of Environmental Management (NCDEM) shall be ' included; 9 (4) groundwater levels, including seasonal fluctuations; (5) location of flood plains; (6) vegetation; (7) topography; (8) soils. (d) Proposed alterations of the site shall be described in detail, including: (1) changes in topography; (2) areas where vegetation will be cleared or otherwise killed; (3) areas that will be covered with an impervious surface and a description of the surfacing material; (4) the size and location of any buildings or other structures. (e) Predicted impacts of the proposed development on existing conditions shall be described in detail, including: (1) changes in water quality; (2) changes in groundwater levels; (3) changes in the incidence and duration of flooding on the site and upstream and downstream from it; (4) impacts on wetlands; and (5) impacts on vegetation. (f) All components of the drainage system and any measures for the detention, retention, or infiltration of water or for the protection of water quality shall be described in detail. including: (1) the channel, direction, flow rate, volume and quality of stormwater that will be conveyed from the site; with a comparison +-o existing conditions and, tc ti: a extent practicable, predevelopment conditions; (2) detention and retention areas, including plans for the discharge of contained waters, maintenance plans, and predictions of water quality in those areas; 10 (3) areas of the 'site to be used or reserved for percolation including a prediction of the impact on groundwater quality; ' (4) a plan for the control of erosion and sedimentation which describes in detail the type and location of control measures, the stage of development at which they will be put into place or used, and provisions for- their .maintenance; - (5) any other information which the developer or the Town of Emerald Isle or its agents believes is reasonably ' necessary for an evaluation of the development. SECTION SEVEN: PROCEDURES AND FEES (a) Any person planning a development as defined in this ordinance, unless exempted, shall submit a Stormwater Management Plan or an application for waiver to the Town of Emerald Isle. (b). Within ten (10) working days after submission of the ' completed waiver application, the Town shall notify the applicant that the waiver has been approved or denied and whether a Stormwater Management Plan must be submitted.by the applicant. (c) A permit fee will be collected at the time the Stormwater Management Plan or application for waiver are submitted and will reflect the cost of administration and management of the permitting process. The Town shall establish, by resolution a prorated fee schedule based upon the relative complexity of the project. The fee schedule may be amended from time to time by the Town Board of Commissioners by resolution. Notice of such resolution shall be published no less than fifteen (15) days prior to adoption. The fee schedule ' shall be appended ' to this ordinance following its adoption and shall be considered to be a part of this ordinance. (d) Within thirty (30) days after submission of the ' completed Stormwater Management Plan the Town shall approve; with or without specified conditions or modifications, or reject the ' Plan and shall notify the applicant accordingly. If the Town has not rendered a decision within thirty (30) days after Plan submission, it shall inform the applicant of the status of the review process and the anticipated completion date. If the Plan ' is rejected or modified, the Tr-n shall state its reasons. Howaver, it is not the responsiuility of the Town or its designated agent to design an acceptable"project. (e) The Stormwater Management Plan shall not be approved unless it clearly indicates that the proposed development will ' meet the Performance Standards described in Section Eight and the Design Standards described in Section Nine, except where a 11 variance has been granted pursuant to Section Five, Subsection (d) : 'or where off -site management is approved pursuant to Section Ten. (f) Inspections: No Stormwater Management Plan may be approved without adequate provision for inspection of the property before development activity commences. The applicant shall arrange with the Town' s Building Inspector or his designated agent for scheduling the following inspections: (1) Initial Inspection: Prior to approval of the Stormwater Management Plan; (2) Bury Inspection: Prior to burial of any underground drainage structure; (3). Erosion Control Inspection: -As necessary to ensure effective control of erosion and sedimentation; (4) Finish Inspection: When all work including installation of all drainage facilities has been completed. The Town Building Inspector or his designated agent shall inspect the work and shall either approve it or notify the applicant in writing in what respects there has been a failure to comply with the requirements of the approved Stormwater Management Plan. Any portion of the work which does not comply shall be promptly corrected by the applicant or the applicant will be subject to the penalty provisions of Section Thirteen. (g) Appeals: Any person aggrieved by the action of any official charged with the enforcement of this Ordinance, as the result of the disapproval of a properly filed application for a permitr issuance of a written notice of violation, or an alleged failure to properly enforce the Ordinance in regard to a specific application shall have the right to appeal the action to the Town Board of Commissioners. The appeal shall be filed in writing within twenty ( 20 ) days of the date of official transmittal of the final decision or determination to the applicant, shall state clearly the grounds on which the appeal is based,* and shall be processed in the manner prescribed for hearing administrative appeals under local and NC State Statutes. SECTION EIGHT: PERFORMANCE STANDARDS The Stormwater Management Plan must demonstrate th development or activity has been planned and designed constructed and maintained to meet each of the standards: 12 e proposed and will be following (a) Ensure that after development, runoff• from the site ' approximates the rate of flow, volume and timing' of runoff that would have occurred following the --same rainfall under existing - conditions and to the extend practicable, predevelopment - conditions. unless runoff is discharged into an Off -site Drainage ' Facility. as provided in Section Ten: (b) Maintain the natural hydrodynamic characteristics of the ' watershed; -- (c) Protect or restore the quality of ground and surface waters; (d) Ensure that erosion during and after development is ' minimized; (e) Protect groundwater levels; ' (f) Protect the beneficial functioning of wetlands as areas for the natural storage of surface waters and the chemical -. reduction and assimilation of pollutants; (g)- Prevent increased flooding and damage that results from improper location, construction and .design of structures in areas -- which are presently subject to an unacceptable danger of flooding; (h) -Prevent or reverse salt water intrusion; (i) Protect the natural fluctuating levels of salinity in ' estuarine areas; (j) Protect the integrity of natural interdunal trough groundwater recharge areas; W Minimize injury to flora and fauna and adverse impacts to fish and wildlife habitat; ' (1) Otherwise further the objectives of this Ordinance. ' SECTION NINE: DESIGN STANDARDS To ensure attainment of the objectives of this Ordinance and to ensure that performance standards will be met, the design, construction and mainL',�,ance of drainage systems shall oe consistent with the following standards: ' .(a) Channeling runoff directly into waterbodies shall be strictly prohibited. Instead, runoff shall be routed through swales and other systems designed to increase time of 13 concentratipn► decrease velocity, increase infiltrations, allow suspended solids to settle, and remove pollutants; (b) Natural watercourses and interdunal troughs shall not be dredged, cleared of vegetation, deepened, widened, straightened, stabilized or otherwise altered. Water shall be retained or detained before it enters any natural watercourse in order to preserve the natural hydrodynamics of the watercourse and to prevent siltation or other pollution; (c) The area of land disturbed by development shall be as small as practicable. Those areas which are not to be disturbed shall be protected by an adequate bar-rier from construction activity. Whenever possible, natural vegetation shall be retained and protected; (d) No gradingo, cutting or filling shall be commenced until erosion and sedimentation control devices have bean installed between the disturbed area and waterbodies► watercourses and wetlands; (e) Land which has been cleared for development and upon which construction has not commenced shall be protected from erosion by appropriate techniques designed to revegetate the area; (f) Sediment shall be retained on the site of the development; (g) Wetlands and other waterbodies shall not be used as sediment traps during development.; (h) Erosion and sedimentation facilities shall receive regular maintenance to insure that they continue to function properly; (i) Artificial watercourses shall be designed, considering soil type, so that the velocity of flow is low enough to prevent erosion; (j) Vegetated buffer strips shall be created or, where practicable, retained in their natural state along the banks of all watercourses, waterbodies or wetlands. The width of the buffer shall be sufficient to prevent erosion, trap the sediment in overland runoff, provide access to the waterbody and allow for periodic flooding without drmage to stru„tures; (k) Intermittent watercourses, such as swales, should be vegetated; (1) Retention and detention ponds shall be used to retain and detain the increased and accelerated runoff which the 14 F development generates. Water shall be -released from detention ' ponds into water courses or wetlands at a rate and in a manner approximating the natural- flow which would have occurred before development; _ ' (m) Although the use of wetlands for storing and purifying water is encouraged, care must. be taken not to overload their capacity, thereby harming the wetlands and transitional ' vegetation. Wetlands should not be damaged by the construction of detention ponds; - ' (n) The first one and one-half (1.5) inch of runoff from impervious surfaces shall be retained on the site of the development; ' (o) Runoff from parking lots shall be treated to remove oil and sediment before it enters receiving waters; ' (p) Detention and retention areas shall be designed so that shorelines are sinuous rather than straight and so that length of shoreline is maximized, thus offering more space for the growth of littoral vegetation; (q) The banks of detention and retention areasshallslope ' at a.gentle grade into the water as a safeguard against drowning, personal injury_ or other accidents, to encourage the growth of vegetation and to allow the alternate flooding and exposure of areas along the shore as water levels periodically rise and fall; (r) The use of drainage facilities and vegetated buffer ' zones as open space, recreation and conservation areas shall be encouraged. ' SECTION TEN: OFF -SITE DRAINAGE FACILITIES (a) The Town of Emerald Isle may allow stormwater runoff ' that is otherwise of unacceptable quality or which would be discharged in volumes or at rates in excess of those otherwise allowed by this Ordinance, to be discharged into drainage facilities off the site of development if each of the following conditions is met: (1) It is not practicable to completely manage runoff on ' _ t1le site in a manner ghat meets the Performance Standards and Design Standaib; ' (2) The off -site drainage facilities and channels leading to them are designed, constructed and maintained in accordance with the requirements of this ordinance; 15 (3) Adequate provision is made for the sharing of construction and operating costs of the facilities with the Town. The developer may be required to pay a portion of the cost of constructing the facilities as a condition to receiving approval of the drainage plan; (4) Adverse environmental impacts on the site of development will be minimized. (b) At request to use off -site drainage facilities and all information related to the proposed off -site facilities should be made a part of the developer's Stormwater Management Plan. Guidelines for the consideration of off -site facility use will be defined in the Manual of Surface Water Management Practices. SECTION ELEVEN: MANUAL OF STORMWATER MANAGEMENT PRACTICES (a) The Town of Emerald Isle shall compile a manual of Stormwater Management Practices for the guidance of persons preparing Stormwater Management Plans, and designing or operating drainage systems. The Manual shall be updated periodically to reflect the most current and effective practices and shall be made available to the public.. (b) The Manual shall include guidance and specifications for the preparation of Stormwater Management Plans. Acceptable techniques for obtaining, calculating and presenting the information required in the Stormwater Management Plans shall be described. (c) The Manual shall include guidance in the selection of environmentally sound practices for the management of stormwater and the control of erosion and sediment. Specific techniques and practices shall be described in detail. The development and use of techniques which emphasize the use of natural systems shall be encouraged. (d) The Manual shall also establish minimum specifications for the construction of drainage facilities. Construction specifications shall be established in accordance with current good engineering practices. (e) The Building Inspector shall submit the Manual and subsequent revisions of it to the Town Board and Planning Board for review and approval,, SECTION TWELVE: MAINTENANCE (a) Drainage facilities shall be dedicated to the Town of Emerald Isle where they are determined to be appropriately a part 16 1 of the Town` s maintained system or are unlikely to be adequately ' maintained by the developer or owner of the property. (b) The systems maintained by the owner shall- have adequate easements to permit the Town to inspect and, if necessary, to take corrective action should the owner fail to properly maintain the system. Before taking corrective action, the Town shall give ' the owner written notice of the nature of the existing defects. If the owner fails within thirty (30) day-s from the date -of notice to commencement corrective action or to appeal the matter to the Town Board of Commissioners, the Town may take necessary ' corrective action, the cost of which shall become a lien on the real property until paid. SECTION THIRTEEN: ENFORCEMENT ' (a) Nuisance: Any development activity that is commenced without prior approval of a Stormwater Management Plan or is conducted contrary to an approved Stormwater Management Plan as required by this- Ordinance, shall be -deemed a public nuisance and ' may be restrained by injunction or otherwise abated in a manner provided by law. ' (b) Civil and Criminal Penalties: In addition to or as an alternative to any penalty provided herein or by law, any person who violates the provisions of this Ordinance shall be punished ' by a fine of not less than One Hundred Dollars ($100) nor more than One Thousand Dollars ($1,000) or by imprisonment in the county jail for a period not to exceed sixty (60) days, or by ' both such fine and imprisonment. Such person shall be guilty of a separate offense for each day during which the violation occurs or continues. (c) Any violator may be required to restore land to its undisturbed condition. In the event that restoration is not undertaken within a reasonable time after notice, the Town may ' take necessary corrective action, the cost of which shall become a lien upon the property until paid. ' (d) Notice of Violation: When the Town Building Inspector determines that development activity is not being carried out in accordance with the requirements of this Ordinance, it shall issue a written notice of violation to the owner of the property. ' The notice of violation shall contain: (1) the name and address of the owner or applicant; ' (2) the street address when available or a description of the building structure, or land upon which the violation is occurring; 17 1 (3) a statement specifying the nature of the violation; (4) a. description of the remedial actions necessary to bring the development activity into compliance with this Ordinance and a..time schedule for completion of such remedial action (5) a statement of the penalty or penalties that shall or may be assessed against the person t.) whom the notice of violation is directed; (6) a statement that the Town's determination of violation may be appealed to the Town Board of Commissioners by filing a written notice of appeal within fifteen (15) days of service of notice of violation. - The notice of violation shall be served upon the person(s) to whom it is directed either personally, in the manner provided for personal service of notices by the court of local jurisdiction or by mailing a copy of the notice of violation by certified mail, postage prepaid, return receipt requested to such person at his or her last known address. - A notice of violation issued pursuant to this section constitutes a determination from which an administrative appeal may be taken to the Town Board of Commissioners. SECTION FOURTEEN: SEVERABILITY Each separate provision of this Ordinance is deemed independent of all other provisions herein so that if any provision or provisions of this ordinance be declared invalid, all other provisions thereof shall remain valid and enforceable. SECTION FIFTEEN: EFFECTIVE DATE This Ordinance shall become effective on Adopted this the _______ day of ________ __, 198__. ----------------------------------- Mayor Rev'ewed for Lecal Corsisten-y: ------------------------- Town Attorney ----------------------------------- Date 9M