SW8960818_Historical File_19961120

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary,
A. Preston Howard, Jr., P.E., Director
Mr. Robert S. Rippy
136 Edgewater Lane
Wilmington, North Carolina 28403
Dear Mr. Rippy:
AW
T4
Oak P
�EHNR
November 20, 1996
Subject: Permit No. SW8 960818
Jungle Rapids
High Density Commercial Stormwater Project
New Hanover County
The Wilmington Regional Office received the Stormwater Management Permit Application for Jungle Rapids on August 21,
1996, with final information on November 8, 1996. Staff review of the plans and specifications has determined that the project,
as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit
No. SW8 960818 dated November 20, 1996, for the construction of Jungle Rapids.
This permit shall be effective from the date of issuance until November 20, 2006, and shall be subject to the conditions and
limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit.
Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in
future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an ajudicatory
hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a
written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative
Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional informath
395-3900.
Regional Water Quality Supervisor
KE/arl: S:1WQSISTORMWATIPERMIT1960818.NOV
cc: Jaman Vithalani, P.E.
Tony Roberts, New Hanover County Inspections
Beth Easley, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
ct Linda Lewis, or me at (910)
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer

State Stormwater Management Systems
Permit No_ SW9 96OR1 R
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended,
and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Robert S. Rippy
Jungle Rapids
New Hanover County
FOR THE
construction, operation and maintenance of a Detention Pond in compliance with the provisions of 15A NCAC
2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and
specifications and other supporting data as attached and on file with and approved by the Division of dater
Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until November 20, 2006 and shall be subject to the
following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other
supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this
permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from 215,186 square
feet of impervious area.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.
2

State Stormwater Management Systems
Permit Nn_ SWR 96081 R
DIVISION OF WATER QUALITY
PROJECT DATA SHEET
Project Name:
Jungle Rapids
Permit Number:
960818
Location:
New Hanover County
Applicant:
Mr. Robert S. Rippy
Mailing Address:
136 Edgewater Lane
Wilmington, North Carolina 28403
Application Date:
August 21, 1996
Water Body Receiving Stormwater Runoff:
UT Hewlett's Creek
Classification of Water Body:
"SA"
If Class SA, chloride sampling results:
N/A (existing pond)
Pond Depth:
3 feet
Permanent Pool Elevation:
17.06 MSL
Total Impervious Surfaces Allowed:
215,186 square feet
Offsite Area entering Pond:
Rerouted around.
Green Area entering Pond:
224,770 square feet
Required Surface Area:
24,110 square feet
Provided Surface Area:
33,541 square feet
Required Storage Volume:
17,972 cubic feet
Provided Storage Volume:
19,166 cubic feet
Temporary Storage Elevation:
17.61 MSL
Controlling Orifice:
2.5" pipe
3

State Stormwater Management Systems
Permit Na_ SWR 960R1 R
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans.
The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon
area.
6. The following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, the Director may determine that other revisions to the project should require a modification to the permit.
7. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements
of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans
and certification in writing to the Director that the changes have been made.
11 SCHEDULE OF COMU? tLIANCE
1. The permittee will comply with the following schedule for construction and maintenance of the stormwater management
system:
a. The stormwater management system shall be constructed in it's entirety, vegetated and operational for it's
intended use prior to the construction of any built -upon surface except roads.
b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
2. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in it's entirety
and maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping.
g. Access to the outlet structure must be available at all times.
Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ.
The records will indicate the date, activity, name of person performing the work and what actions were taken.
4. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit,
the approved plans and specifications, and other supporting data.
4

State Stormwater Management Systems
Permit Nn_ SWR 960Rt R
5. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this
permitted facility, a certification must be received from an appropriate designer for the system installed certifying that
the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications must be noted on the
Certification.
6. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years
from the date of the completion of construction.
M. GENERAL CONDITIONS
1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name
change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by
an application fee, documentation from the parties involved, and other supporting materials as may be appropriate.
The approval of this request will be considered on its merits and may or may not be approved.
2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement
action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6(a) to 143-
215.6(c).
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules,
regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have
jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee
shall take immediate corrective action, including those as may be required by this Division, such as the construction
of additional or replacement stormwater management systems.
5. The permittee grants DEHNR Staff permission to enter the property for the purpose of inspecting all components of
the permitted stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit
modification, revocation and reissuance or termination does not stay any permit condition.
Permit issued this the 20th day of November, 1996.
NOC OL A E / R, ONMENTAL MANAGEMENT COMMISSION
r
reston rd, r., P.E., Director
ivision of Water Q ality
By Authority of the Environmental Management Commission
Permit Number SW8 960818
61

State Stormwater Management Systems
Permit Nn_ SW8 960819
Jungle Rapids
Stormwater Permit No. SW8 960818
New Hanover County
Engineer's Certification
as a duly registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time) the construction of the project,
(Project)
for (Project Owner) hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the project construction such that the construction was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
0

POND M[AWMANCE REQUHU9vfENTS
Project Name: u-n9 I e i g P d S Project No. 5Wg d 'g
Permittee: o b e y �- 5, P Phone No L9 t o) z S� — 6
Address: 1 3 dgec�Q I-�r L:giiQ) 651 1 Tni-n34a-n1 MC 28 40 3
i. Monthly, or after every runoff producing rainfall event, whichever comes first:
A. Inspect the trash rack; remove accumulated debris, repair/replace if it is not functioning.
B. Inspect and clear the orifice of any obstructions. If a pump is used as the drawdown
mechanism, pump operation will be checked. A log of test runs of the pump will be kept
on site and made available to DENT personnel upon request.
C. Inspect the pond side slopes and grassed inlet swales; remove trash, and repair eroded
areas before the next rainfall event.
D. If the pond is operated with a vegetated filter, the filter will be checked for sediment
accumulation, trash accumulation, erosion and proper operation of the flow spreader
mechanism. Repairs/cleaning will be done as necessary.
H. Quarterly:
A. Inspect the collection system (ie. catch basins, piping, grassed swales) for proper
functioning. Accumulated trash will be cleared from basin grates, basin bottoms. and
piping will be checked for obstructions and cleared as required.
B• Pond inlet pipes will be checked for undercutting. Riprap or other energy dissipation
structures will be replaced, and broken pipes will be repaired.
III. Semi-annually:
A. Accumulated sediment from the bottom of the outlet structure will be removed.
B. The forebay depth will be checked at various points. Sediment removal is required when
the depth is reduced to 75 % of the original forebay design depth of ' N I A
C. Grassed swales, including the vegetated filter if applicable, will be reseeded twice a year
as necessary.
S T Gg Ri
Q E C E V E
AUG 2 D
6
PROJ # i-5ws
]- CIosu7C 00.2.

'POND MAINTENANCE REQUIREMENTS
PAGE 2
IV. Annually:
A. The pond depth will be checked at various points. Sediment removal is required when the
depth is reduced to 75 0 of the original design depth or7.s' whichever is greater. Design
depth is 1 o 1 ', measured vertically from the orifice down to the pond's bottom.
Sediment must be removed to at least the original design depth.
V • General:
A. blowing of the side slopes will be accomplished according to the season. blaximum grass
height will be 6".
B. Cattails are encouraged along the pond perimeter, however they will be removed when they
cover more than 1/2 the surface area of the pond. The best time to cut them is at the end
of the growing season, in November. Environmentally sensitive chemical for use in killing
cattails can also be used. Contact your nearest Agricultural Extension Agent.
C. The orifice/pump is designed to draw down the pond in 2-5 days. If drawdown is not
accomplished in that time, the orifice will be replaced with a larger or smaller orifice.
Slow drawdown may be attributed to a clogged system. The source of the clogging will
be found and eliminated.
D. All components of the detention pond system will be kept in Good working order. Repair
or replacement components will meet the original design specifications as per the approved
stormwater plan. If previously approved components are determined to be ineffective, the
component must be redesigned and/or replaced.
VI. Special Requirements:
I, _ P o b 2 -r F 5. +ZI- P P , hereby acknowledge that I am the financially
(please pant or type name clearly)
responsible party for maintenance of this detention pond. I will be responsible for the performance of the
maintenance as outlined above, as part of the Stormwater Management Permit received for this project.
Signature: Dam: 4 /'
r '7
DA/arl: S:\WQS1STORMWAnFORMSIO&M-POND.FOR.

L; k v Ab!Urq UY JlrMiIIISONAWgTAL MANAGEMENT
NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION
I. GENERAL INFORMATION
1. Project Name nu n q� J e P_c P r� S
2. Location, directions to project (include County, Address, State Road) Attach map. K� Q6) N q hoYQY
5 3-20 (01asnAer ;Dy. C.N•inn,.nc-knlC Zg40 3
3. Owner's Name i�o b eYF ,'b U Phonk cP I O ) 2S6 -S'76 1
4. Owner's Mailing Address (3 6 &Jq e WcL FQ1r L_aa n V
V
City Cx� - ; 4 -F� State t3 •C . Zip Z8 4z)3
5. Application date —&- G LLS Z I L 9 9 6 Fee enclosed $ z 2 S;
6. Nearest Receiving Stream _ - - �— ' - H e O I Q } -S Ge Class r t
G1Ci Sfi rlC� y��
7.Projectdescription_Pavo- ,c64- LuNc[Cng�,K�gQ�ae tOCp{i�
/ e
o ea ee �'Ye� �. eIJ 1=14-.Y o"
II. PERMIT INFORMATION
1.Permit No.(Tobefilledi,byDEM) 3-W O boo 25 f Y
2. Permit Type C./ New Renewal Modification (existing Permit No.)
uv�'l�r,n��9 1 fhy�rn►t 1Zo. 93co3
3. Project Tvpe: Low Densitv Detention Infiltration Other: ti' Redevelop General Dir Cert
4. Other State/Federal Permits/Approvals Required (Check appropri= blanits)
CAK4 Major Sedimentation/Erosion Control 1-, 404 Permit
III, BUILT UPON AREA (Please see NCAC 2H.1005 thru .1007 for applicable density limits)
Drainage Drainage Breakdown of Impervious Area
Basin Basin (Please indicate below the desien imnendn,
Classification
paid)
Buildings_
Allowable Impervious Area
Z CJ 070
Streets
Total Project Area
I O • I At
Parking/SW
Proposed Impervious Area
_4. 9 4 A.C.
Other
% Impervious Area
°
Totals
IV. STORMWATER TREATMENT (Describe how the mno$will be treated)
lZ na �e�e�vt,e� Will be
us in a)
S-; 1 4- -Fe r► C E
of So -,Ye o Y
s+a-m .
r area)
Tohal
a.66+
70—
_1-64
246
4.q4-
Yn pOytq Y
-!D�cl©Su-Ve 003

V. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded
for the type of project applied for.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the items required by the permit, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without
concurrence from the State, and that they will be recorded prior to the sale of any lot.
VI. OWNER'S CERTIFICATION
I, 4 ' c 6 e-v t 5. 2 i P P y certify that the information included on this permit
{Please print or type name clearly)
application form is correct, that the project will be constructed in conformance with the approved plans, that
the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge,
the proposed project complies with the requirements of 15A NCAC 2H.1000.
I authorize the beIr named person or firm to submit stormwater plans on my behalf.
Owner/.
Agent Signature and Title
VII. AGENT AUTHORIZATION. (musrBE coMPL=)
Person or firm name �Z i a V11- A" ► 9 l e
Mailing Address 71 t St. S LL� t Q S p 9
City Ll) i � -ni 0 State N , C • Zip 7-8 40 1 Phone�9
Please submit application, fee, plans and calculations to the appropriate Regional Office.
cc: Applicant/WiRO//Central Files
c
S 1A@nl"ER
D E C E I V E
0 AUG
211996
D
PROJ I _ LW�100-9

PgUTANGLE
ENGINEERING, P.C.
201 North Front Street . Suite 809 . Wilmington, North Carolina 28401 . Tel. [phone] . Fax [phone]
November 07, 1996
Ms. Linda Lewis
Environmental Engineer
NCDEHNR
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Subject: Additional Information
Stormwater Project No. SW8 960818
Jungle Rapids Addition
New Hanover County
Dear Ms. Lewis,
,#%T^p
W.
NOV U 8 1996
S(1t)8 gCoDa3 ��
Reference is made to my letter, dated November 05, 1996, subject as above.
The following responses are provided.
A copy of the "sealed" front sheet for calculations is provided.
2. Surface areas at permanent pool of 17.06, is 0.77 acres. The
surface area at the recalculated design pool of 17.61, is 0.83
acres.
The pond configuration and size is modified to save trees on the
south -end of the property. The new configuration as now shown
on the site plan is approved by the City of Wilmington's
Engineering Department (Mr. Dave Mays).
V-state storage elevation is recomputed to Elev. 17.61.
Computations are attached.
3. Permanent pool is dimensioned on the plan.
4. Design pool, 17.61 contour is delineated and labeled.
5. A reducer is designed and detail shown on the attached site plan.
Computation sheet 8A shows the calculations.
I hope that plan and computations meet all your requirements.
I really appreciate, issuance of the permit, as soon as you can.
incerely
*aman Vith&i,.
President

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State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. DIVISION OF ENVIRONMENTAL MANAGEMENT Jonathan B. Howes
Governor WATER QUALITY SECTION Secretary
November 5, 1996
Mr. Jaman Vithalani, P.E.
Right Angle Engineering
201 N. Front Street, Suite 903
Wilmington, N.C. 28401
Subject: ADDITIONAL INFORMATION
Stormwater Project No. SW8 960818
Jungle Rapids Expansion
New Hanover County
Dear Mr. Vithalani:
The Wilmington Regional Office received previously requested information for the Stormwater
Management Permit Application for Jungle Rapids Expansion on October 17, 1996. A preliminary review
of that information has determined that the application is not complete. The following information is needed
to continue the stormwater review:
i/ 1. The calculations have not been sealed.
2. Please report the surface areas provided at the permanent pool of 17.06 and the design pool
of 17.45.
3. Please dimension the permanent pool on the plans.
4. Please delineate and label the 17.45 contour.
5. The 8" outlet pipe will draw down the pond in less than 1 day. Please design a reducer to
increase the detention time to a minimum of 2 days.
.,
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Vithalani -
November 5, 1996
Stormwater Project No. SW8 960818
Please note that this request for additional information is in response to a preliminary review of the
available pond design information. The requested information should be received by this Office prior to
December 5, 1996, or the application will be returned as incomplete. The return of a project will necessitate
resubmittal of all required items, including the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
DAlarl: S:\WQS\STORMWAT\ADDINFO\960818.NOV
cc: Linda Lewis
Central Files
2

ENTANGLE
GINEERING, P.C.
201 North Front Street . Suite 809 . Wilmington, North Carolina 28401 . Tel. [phone] . Fax [phone]
October 17, 1996
Ms. Linda Lewis
Environmental Engineer
NCDEHNR
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Subject: Additional Information
Stormwater Project No. SW8 960818
Jungle Rapids Addition
New Hanover County
Dear Ms. Lewis,
Reference is made to my letter, dated October 11, 1996 and our meeting on
October 15, 1996, regarding the redevelopment of Jungle Rapids.
Again, I reviewed the alternative of adding a forebay and found that it would be
almost impossible to construct the bay within the existing pond. Soil placement would be
extremely difficult and without the ability to compact the soil, the slopes will be unstable
and will fail.
As per your recommendation during the meeting, the inlet pipe to the pond has
been relocated further north to provide the desirable distance from the outlet. As we
discussed, this arrangement will direct the flow counterclockwise and away from the
outlet, providing prolonged holding time for the settlement of sediments. Please refer to
comment 6 of my October 11 letter and consider that the quantity of run-off entering the
pond has been significantly decreased by rerouting the existing drain and bypassing the
pond.
For these reasons I request that you forgo the construction of the forebay for this
redevelopment.
Your assistance in issuing the permit is greatly appreciated.
tincere ,
an Vith ani, E.
President
� OCT 171996
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JUNGLE RAPIDS
5320 OLEANDER DRIVE
CITY OF WILMINGTON,
NEW HANOVER COUNTY,
NORTH CAROLINA
D E C E I V E
AUG 2 11996D
PROJ # � e
December 19, 1992
PREPARED FOR.
ROBERT RIPPY
5320 OLEANDER DRIVE
WILMINGTON, N.C. 28403
PREPARED BY:
Right Angle Engineering, P.C.
201 NORTH FRONT STREET
SUITE 903
WILMINGTON, N.C. 28401

TABLE OF CONTENTS
TITLE PAGE NO.
1.0 INTRODUCTION ............................. 1
2.0 DESCRIPTION ............................... 1
3.0 PROPOSED DEVELOPMENT ..................... 2
4.0 PARAMETERS 3
5.0 CONCLUSION ............................... 4
APPENDICES
A. CALCULATIONS
B. MAINTENANCE AND OPERATIONS AGREEMENT
C. TITLE OPINION

1.0 INTRODUCTION
Right Angle Engineering, P.G. was employed to conduct a drainage study and
analysis of the hydraulic impact from proposed improvements of the real property at
5320 Oleander Drive in Wilmington, North Carolina. The purpose of the study was
to facilitate permitting required for the proposed developments. The Scope of the
study is limited to showing that more than adequate detention will be available
following the proposed developments. Included with this report are maps, Site Plan
and New Hanover County Topographic, a signed maintenance and operations
agreement and a title opinion from an attorney.
Right Angle Engineering conducted a visual inspection of the property to
determine the general flow characteristics and existing hydraulic components. A
Professional Land Surveyor was contracted and a land survey was performed.
Contours, invert elevations, ditch sections and flowlines and pond geometry was
established and vertically tied to the S monument located approximately 300 feet
west and shown on the topography map.
DESCRIPTION
The ten acre site is located near the eastern boundary of the City limits. The
property has five hundred and seventeen (517) feet of frontage on Oleander Drive.
Adjacent properties include residential tracts, light industrial and commercial
properties. The site has improvements including a 1.5 acre man-made pond, seven
small buildings, a go-cart race track, an eighteen hole miniature golf course, and a
pool with 3 large water slides and a pool with motorized bumper boats. Construction
is in progress to replace three of the small buildings with one 6000 ftZ building. ..
The pond was excavated in the mid 1970's for construction of the mound and
water slides. It also function as a detention pond for stormwater management. The
southeast corner occupied by the miniature golf course and the bumper pool has its
own detention ponds that drains 1 % acres. The outlet is an 8" riser pipe that gravity
drains to a ditch and then into the 1.5 acre detention pond. The remaining property
is drained by sheet flow to drainage ditches on the southeast and southwest sides of
the pond. The ditches then route stormwater to the detention pond.
The drainage basin is delineated on the topographic map. It is composed of
approximately 27 acres bounded by Oleander Drive on the south and local collectors
on the east and west. The general slope of the terrain prior to development was
approximately 0.008 foot/foot. Since then, all properties have filled and flattened for
development. Seven adjacent acres to the east are not in the routing path and
excluded from calculations. Ten acres to the west contribute to flow therefore the
drainage area contributing to the pond is twenty (20) acres.

A gas station on Oleander Drive and adjacent to the site is 100% impervious
cover, has no detention, and its' stormwater discharges onto the Rippy property. The
properties behind the gas station also discharge onto the Rippy property. Until
recently, this discharge was via a ditch but presently, incidental to ongoing
improvements, a detention pond is being excavated and the discharged should be
reduced to that that existed prior to development.
PROPOSED DEVELOPMENT
As mentioned above, there is a 6000 Ft.2 building replacing 4 of the small
buildings. Also, during these stage of construction (phase 1), a portion of the marl
parking lot will be surfaced with bituminous pavement, parking spaces striped, and
curbed and sidewalks constructed. The race tracked will be extended and part of the
existing track removed. The alignment :of the track has not been finalized but the
configuration will not be radically different than that shown on the site plan. The
impervious area will be equivalent.
Phase 2 construction is only in the Concept stage. It is dependent upon the
future need for parking. Phase 2 construction is not planned at this time. In the
event that additional parking is required, the phase 1 parking lot will be extended
approximately 360 feet, leaving a 100' undisturbed buffer between parking and the
property line. This would necessitate filling the western portion of the detention
pond. The detention area would be reduced from 1.5 acres to 1.1 acres (water
surface elevation - 17.06'). All calculations are based on the capacity of the smaller
detention pond of 1.1 acres.
2

PARAMETERS
This ten adjacent acres on the.west side of the property, prior to development,
and as shown on the topography map, were covered with dense foliage. For inclusion
into hydrology calculations, runoff coefficient (C) of 0.20 and SCS curve number (C„)
of 30 were assigned . For time of concentration (Tc), the path to the Rippy property
line was 750' with a drop of 4'. From the Kirpich nomograph, T.= 9.6; multiplied by
2 (per nomograph instructions) for overland with grass surface (dense foliage) yielded
19.2 minutes. Another 300 feet to the pond with an elevation loss of 2 feet yielded
4.3 minutes and a total of 23.5 minutes. Peak flow (QP)was achieved by including
only the area of adjacent property that contributes to the pond in 10 minutes. (T,)
For the Rippy property, T, was determined by using L = 840' and H = 5"
which yielded 10 minutes. C and C„ weee weighted. 2.5 acres will be undisturbed,
1.1 acres for pond, C = 1.00 and 1.4 acres of trees and vegetation encompassing
the pond, C = 0.35. The remaining 7.6 acres were assumed developed with 7
of the 7.6 acres impervious, C = 0.95 and 25 % planted, C = 0.40. The weighted
C for the parcel is 0.77. With T. = 10 minutes, 110 = 6.30, Qp = 52.9 for a 10 year
event.
Using the SCS procedure and a weighted C. of 79, the run-off for a six -hour,
ten year storm calculated to 0.825 times 20 acres equals 16.5". Discharged into a
detention area of 1.1 acres will raise the water level 1.25' assuming no discharge.
Using ground water elevation at 17.06'(the outlet invert elevation), the water surface
elevation would rise to 18.31'. Similarly, water surface elevation from a 50 year
storm would rise to 19.62'. Under these conditions, water would begin to back -flow
into inlet ditches but still be contained within the property lines and clear of the
parking lot pavement.
The pond discharges through a 8" PVC pipe into a small outlet pool on adjacent
property at the northeast corner of the site. Storm events of 10 and 50 year
magnitude raise the water surface elevation of the outlet pool at rates similar to those
of the detention pond. This is evidenced by observation from natives and no evidence
of erosion. The pond bank (weir) has been observed topped only once (in 1986) and
water surface elevation was equal on each side of the pond bank. This was either a
100 year storm event or water was backflowing through the 30" culvert.
A natural saddle on the northeast side of the pond exists. The saddle performs
as a broad -crested weir about 80 foot in length and at approximate elevation of 20'.
There is no need for a man-made weir for this pond.
3

CONCLUSION
Design objectives are following:
1. Peak discharge from the site in a 10-year storm after development shall
not exceed the peak discharge from the same site in the 10-year storm
prior to development.
2. An emergency spillway such that its crest is higher than the maximum
stage in the design storm. and its capacity is equal to or greater than the
peak discharge in the 50-year storm when the stage is at the top of the
dam.
Addressing the first design objective, if one would assign a run-off coefficient
of 0.15 to the twenty acres of stormwater that is routed through the 1.1 acre
detention pond prior to any development (other than Oleander Drive). Then use a time
of concentration of 30 minutes which is extremely conservative and gives an Intensity
of 4.30 inches. Using these extremely conservative values for the parameters in the
Rational Formula yields a peak flow of 12.75 CFS. This is a conservative per -
development flow. Next, assume the maximum possible head of 3' at the 8" outlet
pipe (40' in length) and the maximum post -development discharge is 3 CFS. 3 CFS
a 12.75 CFS.
Design objective 2 has been met in that the pond bank will perform as a weir
and its' elevation of 20.4' which is above the maximum stage of a 10-year storm
0 8.3'). The capacity is sufficient to meet the 50-year storm requirements but the
question is mute as downstream constrictions create backwater surface elevations
that prevent weir flow conditions.
4

APPENDIX A
CALCULATIONS

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DATE: February 23, 1993
TO: Bill Penny
City of Wilmington
RE: Amended Hydraulics Report
Jungle Rapids.
Dear Mr. Penny:
Attached is the Amended Hydraulics Report for the proposed
development at Jungle Rapids. Hydraulic calculations have been
revised to account for the subarea north of Oleander. Also attached
is a revised site plan showing the culvert draining this subarea and
the final alignment of the race track extension. A New Hanover
County topography map was previously submitted and an Inspection
and Operations Agreement and attorney's Title Opinion was
furnished to you by Jim Vithalani on January 26, 1993.
We have met the City of Wilmington's requirements for storm
water management and request your expeditious approval.
Sincerely,
Gerald Devito, P.E.

APPENDIX D
REVISION
DESCRIPTION
Subsequently to the initial submittal of this report on January 22, 1993, a
storm line has been uncovered and necessitated supplementary calculations to
accommodate the additional run-off. The storm line in question is shown on the
revised plan submitted with this amended report.
The inlet end is 30" concrete and is. located on the north side of Oleander. The
outlet is 24" concrete and has been broken to terminate at its existing location. A 20
to 25 foot extension of the pipe and it would outfall into the same ditch as the pond
outlet and bypass the subject detention pond. This would be the logical point of
termination which appears to be the case at one time.
The connection of the 30" line to the 24" is made in a concrete junction box
with a wood cover. The 30" storm pipe undercrosses Oleander and is approximately
150 foot in length. The 24" line continues from the point of connection another 390
feet to its outlet just inside the Jungle Rapids property line. The supplementary
calculations include the additional flow from this storm line.
As shown on the New Hanover County Topography Map No. 62-10 and dated
1975, there were localized low areas scattered throughout the basin drained by the
30"/24" culvert. These low areas collected and detained stormwater and thus
reduced peak flows. Permeable soils reduce run-off volumes. Since 1975, the area
has been developed and prepared for building. Low areas have been filled and
properties graded to drain. One property is a storage facility that is more than 50%
impervious and has no detention. However, increased run-off due to development is
inconsequential as the volume of water routed through the Jungle Rapids' detention
pond is limited by the capacity of the 30"/24" culvert under outlet control.

ASSUMPTIONS
. Lacking a dated topography map created a problem in developing the area
parameter to calculate run-off. Consequently, it was necessary to calculate the full -
flow capacity of a 24" concrete pipe and use this as the peak flow in the Rational
equation to calculate the acreage of the subarea north of Oleander.
Full flow capacity cannot be achieved due to the loss of energy at the 30" to
24" connection. Nevertheless, full -flow was assumed.. Using Manning's equation,
an invert gradient of 0.0062 Ft./Ft. and Manning's roughness coefficient (n) of 0.011,
the. flow capacity (Q) calculated to be 21 CFS.
Substituting this Q in the Rational Equation, Q = CIA, assigning a run-off
coefficient of 0.45 to C and I = 5.70 from a T,= 14.2 minutes yields 8.2 acres. A
Cn of 60 was assigned to this 8.2 acre subarea north of Oleander.
CONCLUSIONS
The impact of this additional run-off from the subarea north of Oleander will
raise the pond level from 18.40' (as previously calculated) to 19.33" M.S.L.(10 year
storm) Stormwater will be contained below the natural saddle at elevation 20.40'
M.S.L. Thus considering the additional drainage from the area north of Oleander, the
10 year storm run-off will be contained within the pond and on the Jungle Rapids'
property.
Using conservative assumptions in computing and detaining stormwater, the
developer has complied with the City of Wilmington's requirements.

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"'TANGLE
AUG
U6 2 1996
ENGINEERING, P.C.
201 North Front Street - Suite 809 - Wilmington, North Carolina 28401 - Tel. [phone] . Fax [phone]
August 21, 1996
Ms. Linda Lewis
Environmental Engineer
Water Quality Section
NCDEHNR
127 Cardinal Drive Ext.
Wilmington, NC 28405-3845
Subject: Request for Stormwater Management Permit
Jungle Rapids Addition, New Hanover County
Dear Ms. Lewis,
Enclosed are two sets of stormwater management permit submittals for the
subject as per your letter dated August 16, 1996.
The package includes:
STORMWATEk
E C E I V E
D
A U G 211996
PROJ S& M -8I8
Check for $225.00;
- Completed application form-Inclosure No. 1;
- Stormwater Facilities Operation and Maintenance Plan-
Inclosure No. 2;
- Brief narrative and detailed breakdown on impervious
areas, 3 sheets-Inclosure No. 3;
- Stormwater collection calculations, 4 sheets- I nclosure
No. 4;
- Hydraulic Report and calculations as prepared for City of
Wilmington Permit- Inclos ure No. 5;
- Proposed Modification Plan with Vicinity Map-Inclosure
No. 6;
- Existing Facility Plan-Inclosure No. 7.
The project was permitted by City of Wilmington in 1993, Permit No. 93003.
The hydraulic design and computation prepared for that permit assumed 75% of the
area to be impervious, and the existing pond was found to have capacity to retain 50-
year storm occurrence. The 1.1 acre pond has capacity in excess of needed capacity
for the proposed facility modifications with total impervious area of 48.9%.
Hope you find the information adequate, meeting your requirements and permit
Jungle Rapids to continue its stormwater management with the present pond capacity
and surface area of 1.1 acre.
Sincerely,
0i cv-
Jaman Vithalanl, P.
President

JUNGLE RAPIDS.
5320 OLEANDER DRIVE
WILMINGTON, NC 28403
NARRATIVE
Mr. Robert Rippy, owner of the facilities at Jungle Rapids proposes the following
changes and additions at the facility.
a. Interchange locations of the go-cart raceway and water slides.
b. Extend parking.
c. Addition to the existing building.
d. Modify the present 1.1 acre storm drainage management and sediment control
pond, maintaining surface area and capacity.
Total area Jungle Rapids Facility occupies is 10 acres. The area is composed of
natural soils and some man-made fill. The natural soils are sandy loam.
Run-off will be conveyed to the pond, and the sediment will be controlled. Run-off from
the relocated go-cart raceway and water park will be piped to the pond. Run-off from
the- parking lot will be allowed to sheet flow. Run-off from west of parking lot will be
collected by swale and then to the pond.
The pond having capacity to store 50-year storm, no sediment is expected to leave
property.
D E C E I V E
AUG 211996
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