ORDER N0.28604
FLOOD PLAN STUDY
BUMBLE BEE HILLS
Came to be heard this the 12`f' day of April 2004, with motion made by Commission
Baldwin, Seconded by Commissioner Letz, the Court unanimously approved by a vote of
3-0-0 to accept the flood plan study as presented by Vordenbaum Engineering, Inc for
Lots 42-44 of Bumble Bee Hills.
~~ ~ ~! C ~
COMMISSIONERS' COURT AGENDA REQUEST
PLEASE FURNISH ONE ORGINAL AND NINE COPIES OF THIS REQUEST AND DOCUMENTS
~- TO BE REVIEWED BY THE COURT.
MADE BY: Franklin Johnston. F.E.
MEETING DATE: April 12, 2004
OFFICE: Road & Bridge
TIME PREFERRED: (request to be Last on
the Agenda}
SUBJECT: (PLEASE BE SPECIFIC} Present Engineer's Flood Study for Lots 42-44 of Bumble Bee
Hills and consider whether a revision of flat is required for same.
EXECUTNE SESSION REQUESTED: (PLEASE STATE REASON)
NAME OF PERSON ADDRESSING THE COURT: Franklin Johnston/Stewart Vordenbaum/Valsek
ESTIMATED LENGTH OF PRESENTATION: 15 minutes
IF PERSONNEL MATTER -NAME OF EMPLOYEE:
Time for submitting this request for Court to assure that the matter is posted in accordance with
Title 5, Chapter 551 and 552, government Code, is a follows:
Meeting scheduled for Mondays: 5:00 P.M. previous Tuesday
THIS REQUEST RECEIVED BY:
THIS REQUEST RECEIVED ON:
All Agenda Requests will be screened by the County Judge's Office to determine if adequate information has
been prepared for the Court's formal consideration and action at time of Court Meetings. Your cooperation
will be appreciated and contribute towards your request being addressed at the earliest opportunity. See
Agenda Request Rule Adopted by Commissioners' Court.
~~ ~
Vordenbaurn Engineering, Inc.
Civil and Structwal Engineering
March 11, 2004
Kerr County Floodplain Administrator
Attn: Franklin Johnston, P.E.
4010 San Antonia Highway
Kerrville, Texas 78028
830-997-4744
FAX NO. 830-997-6967
Re: Job No. 04021, W.E. Vlasek, Should Bee Drive, Lots 42-44, Hunt, Flood Study, Kerr
County, Texas, T04021-2.
Dear Sir,
It is our understanding that this study is not required to be sent to FEMA.
Hydrological and hydraulic studies of the above referenced property have been completed.
Elevations are based on a USGS benchmark.
The design procedures and calculations contained in Regional Equations for Estimation of
Peak-Streamflow Frequency for Natural Basins in Texas (USGS Report 96-4307} were used
in the hydrological study to calculate the flow at the proposed site. The Carps of Engineers
HEC-RAS program was used to model streamflow.
The following were used in the study:
1. 7.5 Minute Series (Topographic), USGS maps were used to determine overall stream
slopes and the drainage areas. ~ -
2. The equations for Region 5 were used to determine Q100 for Bumble Bee Creek.
3. The computer program HEC-RAS, developed at the Hydrologic Engineering Center of the
Corps of Engineers, was used to determine the 100 year flood elevations at the various
sections.
V4RDENBAUM ENGINEERING, INC.
507-D EAST HIGHWAY STREET
FREDERICKSBURG, TEXAS 78624
4. The HEC-RAS Crass-Sections, 9 - 11, were determined from field surveying completed by
this office on March 3, 2004.
5. The enclosed HEC-RAS run shows that the fill in question does not appear to have any
detectable effect on the 100 year (1% chance} flood event in Bumble Bee Creek. Survey
shots were made at the corners of the latest (Oct 2003} fill, and are labeled "CRNR FILL".
Survey shots were also made on what was estimated to be the farthest extents of the fill placed
in 1999, and are labeled "GR NAT". Below the southernmost corner of Oct 2003 fill on
cross-section 9, Point 1039 is also natural grade. As shown on Drawing C-1, the calculated
Bumble Bee Creek 100-year flood only touches the estimated maximum extent of 1999 f 11
near cross-section 10. However this occurs at the edge of shallow water on the inside of a
curve. This will have no effect on the flood elevation or water velocities.
6. The subject lots are in a backwater area of the Guadalupe River 100-year flood event.
Immediately downstream east of the lots is an area of land as high or higher than the subject
lots with fill. This land downstream is the controlling feature with respect to the Guadalupe
River I00-year flood elevation. The fill on the subject lots will not have any adverse effect on
the Guadalupe River 100-year flood elevation. The Guadalupe River 100-year flood
elevations, as scaled from the current FIRM map, are shown on Drawing C-l.
Enclosed are the following:
I . Property Information, FEMA 8 I -87. (2 pages}
a. FIRM Photocopy (1 page)
2. Elevation Information, FEMA 81-87A (1 page)
a. Bumble Bee Creek flow calculations (2 pages}
b. Bench Mark Description (1 page)
c. Drawing C-1 (I page}
d. HEC-RAS Run 04021.p01 (4 pages)
e. HEC-RAS O4021.p01, Profile and Crass-sections (2 pages}
The Q100 flow for Bumble Bee Creek was calculated at 4,556 cfs.
If I can be of any further assistance concerning this matter please feel free to call.
Sincerely,
Kevin Spraggins, P.E.
~~..~~~~
.= ~ O F ~~1
~,~~'• ••~*~I
°,t . •~ :*
;KEVIN W.•SPRAGGINS
%,r .~'.•.~/ 84823 ~.'~~~
tt ~~ .CEN~~• ~`~•-
~t~t ss~~NA~EN~'\"
._. Cc: Mr. W. E. Vlasek (with out HEC-RAS and attachments)
Mr. Franklin Johnston, Floodplain Administrator Kerr County
FEDERAL EMERGENCY MANAGEMENT AGENCY
PROPERTY INFORMATION FORIVt
o.a,G~ nro. 306-o~a7
Expir6 Seprunbsr 30, 2045
PAPERWORK BURDEN DISCLOSURE NOTICE
J„FJiw ronnRinn ivirrlon for -hic form it acNmatatf M aVGraaa 1.63 116LIrT C]Ar resoonae. Th6 burden actimatA inductee thA time fOr reviaYMln~ inGtfUCtiOnC.
searching exls6np data sources, gathering and maintaining the needed data, and completing, reviewing, and sutmrittinp the form. You are not required
ho respond to this collection of information unless a valid OMB control number appears in the upper right corner of flue form. Send comments regarding
tl~a accurary of the burden estimate and any euggesoons for redudng this burden to: information Collections Management, Federal Emergency
Management Agency, 500 C Street, SW, Washington DC 20472, Paperwork Reduction Project (3067-0147). Submission of the form is required to
obtain or retain benefits under the National Flood insurance Program. Pleases do not send your compleUed survey to tt-e above address.
This farm may tae completed by the property owner, property owner's agent, licensed land surveyor, or registered professional engineer iD support a
request for a Letter of Map Amendment (COMA}, Canditiortal Letter of Map Amendment (CLOMA), Letter of Map Revision Based on Filt (LOMR-F), or
Conditional Letter of Map Revision Based on Fill (CLOMR•F) for existing or proposed, single or multiple Iots/structures. Please check the item below
that describes our re uest:
^ LOttitA	A latter from FEMA stating that an existing structure or parcel of land that has not been elevated try ft1E
	natural ads would not he inundated the base Rood.
^ CLOMA	A letter from FEMA stating that a proposed structure that is not to be elevated by fiN (natural grade)
	would not be (nundated b the base flood ff built as o ed.
^ LOMR-F	A letter from FEMA stating that an exfstinp structure or parcel of land that has been elevabad by fill
	would not be inundated the base flood.

^ CLOMR-F	A letter from FEMA stating that a parcel of land or proposed structure that will tae elevated by fill
would not be inundated by the base flood if fill ie plac:ed on the parcel as proposed or the structure is
	built as o ed.
Eil1 is defined as material from any source placed to raise the ground to or above the Base Flood Elevation (BEE). The common canatruction practice of
removing unsuitable existing material (topsoil) and bar#illing with select structural material is not considered the placement of fill if the practice does oat
after the existins (nauaral grade) elevation, which is at w above the.BFE. Fill that is placed before the date of the first National Flood Insurance
Program (NFIP) map showing the area In a Special Flood Hazard Area (SERA) is considered natural grade.
)9q 4
Hss fill been placed on your propertYt ®Yes ^ No If yes, when was tilt placed? p ~~ ! L p0 3
manthlyear
( 1~k~J1 fiU bo placed on your property? ®Yes ^ No If yes, when will fill be placed? / 2 0 o y
PAD T 0 l 13S . fo monttVyear
r
Street Address of the Property (if request is for multiple structures, please attach additional sheet):
~pTS ~tZly3,~fy SuouLD BfE DKtvE
I{ 2. Legal description of Property (Lot, Block, Subdivisiony (if a street address cannot be provided):
~- LOTS 4L, 43~'i~i gUN10tE 6~E I-~tt_L S 5u6QtvrstON
! 3. Are you requesting that the SFHA designation be removed from (check one):
^ the entire legally recorded property?
^ a portion of land within the bounds of the property (a certified metes and bounds description and map of the area to be removed,
certified by a licensed land surveyor or registered professional engineer, are required}?
structures on the property? What are the dates of o>anstruction? F u T V R F L d N ST R U LTI O n!
a. is ttus request fora (check one):
^ single structure
^ single lot
^ multiple structures (Now many structures are involved in your request? List the number. )
® multiple late (How many lots are invdved in year request? List the number: [ 3 }
t_
1=1:1.i:~ Form 131-BT, SEPT 02 Property Information Form MT-1 Form 1 Page 1 of 2
~vk
~ In addition to this form (MT-t Farm 1}, ALL requests must inducts the following:
r
l/ Copy of the Ptat Map for the property ( OR rdation data and stamp of the Retarders Office}
-~/ ~
• Capy of the property Deed (with recordation data and stamp of the Recorders Office}, accompanied by a tax asseasora map or other oer66ed
~ map showing the surveyed location of the property relative to local streets snd watercourses
,~ • Copy of the etfeclive FIRM panel and/or Flood Boundary and Ftoodway Map (FBFM} (if applicable) on which the property location has been
accurately plotted (property inadvertentty located in the NFIP regulatory floodway wilt require Section B of MT-1 Form 3}
• Form 2 -Elevation Form. If an FJevation Cerdficabe has already been completed for this property, it may be submitted in addition to Form 2
Please include a map scale and North arrow on sit mope submitted.
For LOMR-Fs and CLOMR-Fs, the following must be submitted in addition to the items listed above:
• Fam 3 -Community Acknowledgment Form
Processino Fee (see instructions for appropriate mailing address; or, visit http:/fwww.fema.povftf-mttrm_fsss.shtm for the most current fee
schedule)
Revised fee schedules are published periodically, but no more than once annually, as noted in the Federal Reoister. Please note: single/multiple
tot:(s)lstrudaue(s) LOMAs ors fee exempt. The current review and processing fees are listed below.
Check the fss that applies do your request
^ 5325 (single IotKtcudure LOMR-F following a CLOMR-F)
^ 5425 (single lotfatrucbure LOMR_F) N/i~
^ 5500 (single lot/strur~ure CLOMA or CLOMR-F) ..
~~ ^ 5700 (multiple iotlstrud:ure LOMR-F following a CLOMR-F, or multiple !otlstructure CLOMA)
^ 5800 (multiple ioUatrudure LOMR-For CLOMR-F}
Pla:~se submit the e
Paym nt information Form for remittance of applicable fees. Please make your chedcor money order payable to: National Flood
tn5uran~i Prooram.
Alt documenfg submitted In support of ttsia request are correct to the best of my knowledge. 1 understand that any false statement may be punishable by
tins or imprisonment under Tide t8 of the Wnited States Code, Section 1001.
`. Atrxiear>rs Name: V~1 • t~ • y 1~e,K
Please Print or type
l~silinQ Address: ~ ~ ~C H~ t t~cll.~ u~r ~e
i~ ecl eri ckS b~ r 4 ~e~as ~$coZ~k
k•„~:ril Andress:
(opponal)
Comparry: ~or~2nbau~~m ~~~~ ~e~r ~~ n YI
Daytime Telephone Norn
Fax No.: D 3V ~ "l~'I ~ ~ ~ ~ 1
D4 L3 ~,~~''yZCQ~ Signature of Applicant (required)
C~~.~v~ n~.tiG~
~~ you have any questions concerning FEMA policy, or the NFIP in genera{, please contact the FE~a Assistance Center toil free at t-877-F
P EMA
P (t-877-336-2fi27), or visit the Flood Hazard Mapping website at www.femagovtthm/.
H : I~ua Form 8t-07~ SEPT 02 Property Infovmatbn Form MT-1 Form 1 Page 2 Of 2
FEDERAL EMERGENCY MANAGEMENT AGENCY
ELEVATION FORM
D.ALS NQ 3@67-BIi7
Fapirrs Seplembsr 3@, ZOOS
' °~ PAPERWORK BURDEN DISCLOSURE NOTICE
F :reporting burden for this form is estimated to average 1 hour per response. The burden estimate includes the time for reviewing instructions
,
searching exiatlng data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not required
to respond to this collection of information unless a valid OMB control number appears in the upper right comer of this form. Send comments regarding
the aoeuracy of ttw burden estimate and any suggestions for reducing this burden to: Information Colledione Management, Fedora) Emergency
ManapementApency, 500 C Street, SW, Washington DC 20472, Paperwork Reduction Project (3067-0147). Submission of the form is required to
'
obta
r n or retain benefits under the National Flood lrtsurance Pr ram. Please do not send ur com ts6ed sunre to the above address.
This form must be completed for requests and must be completed and signed by a registered professional engineer or licensed Isnd surveyor. A FEMA
Nattonaf Food Insurance Program (NFtP) Elevation Certificate may be submitted to addition bo this form for single structure requests.
For requests tp remove a strucure on natural grade OR on engineered flU from the 5pedal Flood Hazard Area (SERA), submit the lowest adjacent
grads (the lowest Around touching the structure), including an attached deck or garage. For requests to remove an entire parcel of land from the SFHA,
provi0e the lowest lot elevation; or, if the request Involves an area described by metes and bounds, provide the lowest elevation within the metes and
bounds description.
t. NFIP Community Number Properly Name or Address: .
I 480y1g Lois 42rc-13,'ty 4,...,b1~ Qec Nti11s S~bc1.
2 Ara the elevations {Isted below based ort ®~}S~!]a or ^ DfOCOEed conditions? (Check one]
3. 1Afiat is the elevation datum? fu GV D 1q If any of the elevations listed below were computed using a datum different than the datum used for the
effective Flood Insurance Rate Map (F[RM) (e.g., NGVD 28 or NAVD t3ej, what was the conversion factor?
~ Local Elevation +/-fk ~ FIRM Datum
(
f 4. For the existing or proposed structures listed below, what are the types of canatructlon? (check all that apply)
^ crawl space ^ slab on grade ^ basementlendosure ®other (explain] UN K ~- 0 W N
5. Has FEMA Identified >fiis area as subject tp land subsidence or uplift? (see instructions] ^ Yes 0 No
~ .~tf yes, what is the date of ttts current relevsUng? / (monthyear)
t
~~
I			Lowest		
r Lot hiumber	Block
Number	Lowest Lot
Elevation	Adjacent
Grade To	Base Flood	
For FEMA Use Only
			Structure	Elevation	
' ~!? y3 c!	-	N q	Nf A	SEE ORA~ti-~4	C-1
					
					
Th't~ cartificatlon is to bs signed and sealed by a licensed land surveyor, registered professional engineer, or architect authorized brr law to certify
~luvation information. All documents submitted in support of this request are coned to the best of my knowledge. t understand that arty false
r.t:tarnent may be punishable bfr fine or imprisonment under Title 16 of the United States Code, Section 1001.
..~. s.
Ccrtifier's Name:	License No.:	Expiration Date:
C~.mpany Name:	Telephone No.:	Fez No.:
Si3nc~ture: ~ Date: 3~I~~1 Z~~
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~ ~8 ;l~I ~ t/f'`~•`-~- / / ~ .,4r l l lG:;'F.=3~- ;.} 'S'~1`+)~-1 ~~1t,t, t\ .1 r'Itj~ i?:.r}. 4 '~y4•~ 4~MpL~ ~~ y '+r ~ ° ~-

.,-~
:~
zoNE a v
ZONE
ELEVAT[UN REFERE{1iCE MARKS
;, / f ~~ ~ ~ ~zaNE: x
REFERENCE
MARK
1.721.16
1.722.29
t,72s.sa
RLI N	t,713Ad
F1M 100	1,73a.2B
awt9t	1,7at.69
""` FiN 102
RAI 103
.~
ELEVAYION
(FT. NCsVD~ I
RIA a6
f~At 67
.~.~..~ RM ae
Rid 101
1 Rrv1t06
F1h1108
Rlrl L07
R-A 108
i f11A }06
RM t 10
'Rklttt
RAA tt2
,1Rhit13
Fifrt 114
f1AA t 16
Rlrt t t6
ffld 117
1,631.70
1,n3.a1
1.764.84
1,614.66
1.608.64
1.617.11
1,826. S 2
1,626.00
1.826.77
1, 846.52
1,667.21
1.676.22
1,636.06. -
1,616.06
t .617.77
1,767.61
DESCRIPTION OF LOCATION
Bquan out bt oonaaa on thr wse akle of a caetl. puar0 on ehe
notch skis of t4q Miahtwy 36. {
Bquan wt rA arnorat- -n tfta Dante. of s haadwatl of • auhiart
undo. Batr Niphway 36.
UBGH banoh mark N 219. In thr top of the southeast and ad tlta
southwest abuthtaM of the Sata Miphway 39 bttdpe, 16 feet
seutlteast of tM Dancer Yno of the hlphway. A standard dtsk.
stampad'N 219 1934.'
Bauan wt N eM tap of • stone waH.
Brass disk Nt M eM top south oottarra ra{Ynp on vwst and of ehr
ttatr Hlphway 36 brWps Nroas the Guadatupa Rhrar.
Bolt apikr Nt In a 241nah pin oak on tit. north side of ttaG N~ph-
way 39.
Top noKhwest eorrwr of thewast rnuana pate of an unlrnprovd
rwd, BO trrt south of thr cent.. Yna of Stets Miphway 27.
Square cut in oodene M the northNSt corner of tM headwaY d •
3' X 4' boa duhrart, 36 frd aauth of the waLr Yeta of Sntr kt-ph-
wey 27.
Square cut in eonenb M Nta northeast came. of tM hNdwall of •
4' X B' bas CuHart, t 7 fast south of ehs cants. llrta o! ttaq N-ph-
way 27.
USGtbenahmarkT4l9. tNlnth~toppfapoat.62faetwastof
tM Dann. Yna of ttaa Niphway 27. A atattdard disk. anmpad'T
419 1936."
8gwn out In the eottarb kl the watt artd of a /' X 4' boseulvart,
22 Prat north of thr arettad-nr of Stan Miphway 2T.
iquur Cut In eataran kt tM south side of a 1' X 10' boa cuhtart,
26 (eet southwest of the aMtM Ynr of ttati Niphway 27. ,
Squaw cut in concrete {n an B•Ineh stone waU, 4B feet west o1 the
canter Yna o1 tuL Ml6hwiy 27.
USfIt brneh took X K9. to the top o1 tM want headwall of •
1' X ~' boa aulvart, 21 feat want of the aNter Iine of sots Nlph• -
waY 27.
Square out to eottcna-n the northeast eomar of the Madwaii of a
, aulvrrt, 17 fret south of tM center Ym of Staq Miphway 27.
Square sot M ogttaren In the northeast eomar of a Madvntl of •
au1WR. 19 fact south of the center Ilne of ata4 Miphway 27. , ,
USGS bench mark W /4B. In the top of the want curbinp at the -
no-th and of a eonueh bddpa 14 feat west of the center lute of
Stab Niphway 27.
Bquan cut {n concrete b thr curb at the southuat tuner ofSun-
eat Crmatrry. ~~
8quarr out -n eonwatr in the northeast eomar of a eonuah apron
undrr thr puudrail fn a curve, 26 fast want of the crrttar I-nr of UNIrICORPO)
Btatr Niphway 27.
U60B bench mark V 449. In the top of a concntr post. 69 hat
want of the amur Ilna of State H{phway 27. A s4ndard disk
stamped 'V 146 1936.'
Bqu-n cut In t:onerab In the top nli in the northeast eomar ai the
old Sue Miphway 4t brldp• ovrr Johnson Creak.
Bolt spike art fn a nhphona polo approaimatrly 700 feat north of
the {natseotlon of Sea Miphway 39 and Farm Rw0 1340.
HEC-RAS September 1998 Version 2.2
U.S. Army Corp of Engineers
Hydrologic Engineering Center
609 Second Street, Suite D
Davis, California 95616-4687
(916) 756-1104
X X	XXXXXX	XXXX	XXXX	XX XXXX
X X	X	X X	X X	X X X
X X	X	X	X X	X X X
XXXXXXX	XXXX	X	XXX XXXX	XXXXXX XXXX
X X	X	X	X X	X X X
X X	X	X X	X X	X X X
X X	XXXXXX	XXXX	X X	X X XXXXX
PROJECT DATA
Project Title: W.E. Vlasek, Lots on Should Bee
Project File 04021.prj
Run Date and Time: 3/10/2004 4:17:34 PM
Project in English units
Project Description:
Check effect of fill on Bumble Bee Creek
PLAN DATA
Plan Title: existing w/ fill
Plan File C:\HEC\RAS\Data\04021.p01
Geometry Title: existing w/ fill
Geometry File C:\HEC\RAS\Data\04021.g01
Flow Title existing
Flow File C:\HEC\RAS\Data\09021.f01
Plan Summary Information:
Number of: Cross Sections = 3 Mulitple Openings = 0
Culverts = 0 Inline Weirs = 0
Bridges = 0
Computational Information
Water surface calculation tolerance = 0.01
Critical depth calculaton tolerance = 0,01
Maximum number of interations = 20
Maximum difference tolerance = 0.3
Flow tolerance factor = 0.001
Computation Options
Critical depth computed only where necessary
Conveyance Calculation Method: At breaks in n values only
Friction Slope Method: Average Conveyance
Computational Flow Regime: Mixed Flow
..--..
FLOW DATA
Flow Title: existing
Flow File C:\HEC\RAS\Data\04021.f01
Flow Data (cfs)
River Reach RS PF 1
Bumble Bee Vlasek 11 4556
Boundary Conditions
River Reach Profile Upstream
Bumble Bee Vlasek PF 1 Normal S = .0199
GEOMETRY DRTA
Geometry Title: existing w/ fill
Geometry File C:\HEC\RAS\Data\09021.g01
CROSS SECTION RIVER: Bumble Bee
REACH: Vlasek RS: 11
Downstream
Normal S = .0058
INPUT
Description: 150' downstream of Should Bee, 240' upstream of bend
Station Elevation	Data	num=	19					
Sta	Elev	Sta	Elev	Sta	Elev	Sta	Elev	Sta	Elev
100	1735.61	116	1734.83	143	1731.49	161	1725.91	232	1726.18
247	1719.91	250	1718.1	256	1718.2	259	1718.89	297	1726.1
336	1724.33	376	1726.14	391	1731.11	423	1734.76		
Manning's	n Value	s	num=	3					
Sta	n Val	Sta	n Val	Sta	n Val				
100	.035	232	.035	297	.05				
Bank Sta:	Left	Right	Lengths:	Left Channel	Right	Coeff	Contr.	Expan.
	232	297		220	238	252		.1	.3
CROSS SECTION RIVER: Bumble Bee
REACH: Vlasek RS: 10
INPUT				
Description: SW of	fill	at bend of	Bumble	Bee Creek
Station Elevation	Data	num=	11	
Sta Elev	Sta	Elev	Sta	Elev Sta Elev Sta Elev
100 1735.61	120	1735.24	134	1731.35 186 1724.67 283 1722.63
320 1721.18	341	1716.79	353	1712.98 359 1713.62 365 1720.5
377 1732.28				
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
100 .04 341 .04 365 .07
Bank Sta: Left Right Lengths: Left Channel Right
341 365 266 281 295
CROSS SECTION RIVER: Bumble Bee
REACH: Vlasek RS: 9
Coeff Contr. Expan.
.1 .3
INPUT
Description: South of Fill, closest to TX 39
Station Elevation Data
Sta Elev 5ta
100 1735.25 114
179 1707.4 193
288 1723.61
Manning's n Values
Sta n Val Sta
100 .04 175
Bank Sta: Left Right
175 195
num=
Elev
1734.81
1707.2
num=
n Val
.04
Coeff
11
Sta Elev Sta Elev Sta Elev
135 1725.97 140 1725.8 175 1712.66
195 1709.11 236 1725.49 262 1723.96
3
Sta n Val
195 .065
~ontr. Expan.
.1 ,3
SUMMARY OF MANNING`S N VALUES
River:Bumble Bee
Reach River Sta. nl n2 n3
Vlasek 11 .035 .035 .05
Vlasek 10 .09 .04 .07
Vlasek 9 .04 .04 .065
SUMMARY OF REACH LENGTHS
River: Bumble Bee
^ Reach River Sta. Left Channel Right
Vlasek 11 220 238 252
Vlasek 10 266 281 295
Vlasek 9
ERRORS WARNINGS AND NOTES
Errors Warnings and Notes for Plan east w/ fill
River: Bumble Bee Reach: Vlasek R5: 11 Profile: PF 1
Warning:Divided flow computed for this cross-section.
River: Bumble Bee Reach: Vlasek RS: 10 Profile: PF 1
Warning:The velocity head has changed by more than 0.5 ft (0.15 m~. This
may indicate the need for additional cross sections.
Warning:The conveyance ratio (upstream conveyance divided by downstream
conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for
additional cross sections.
Warning:The energy loss was greater than 1.0 ft (0.3 m). between the current
and previous cross section. This may indicate the need for additional cross sections.
River: Bumble Bee Reach: Vlasek RS: 9 Profile: PF 1
Note: Hydraulic jump has occurred between this cross section and the
previous upstream section.
o~ e~... • o.....w_ oee Dnn~6• Ua<n4
..~ Re~cn ..	...Eir~m ~	t1 t~	-,~n cn{~1	w.s. e+a,	crsrcw.$.	~ o.~+m	~ a'; sio~	vii	nom;	~aN V+nan+	s cM
							r				
1/tasolt	! 1	1558.00	1718.10	1728.14	1727.29	1729.E	OA1992S	15.38	x58.38	205.08	1.31
~~	{- ~~	4558.00	1712.88	1724,58	1724.95	1728.13	0.007461	13.04	541.13	177.98	0.74
	--~~	4556,00	170720	1720.12	1718.64	1722.30	0.006804	13.50	469.28	87.41	0.68
~ ~ :. ~~~.
..,
p,74
~~.. •
pbu,: ex~'"~ ~ R~Q 1 ~ ~: ~;,,w:., ~7~.., ~~~ ~ ~ ~ 19 ~ ~~ 67.41
~ ,~~= .,.. ~'~ ~~ 1 1?26.'~3 13.54
~ 1716.10 1n456 172+ 17a1.~ Q.W~
~ 1T1~~ 5716~~
. ~ '11 4r 1?DTZ4 14.12
,~
....
8 ...
,y.~
W.E. Vlasek, Lats on Should Bee existing w/ fill 3!10/2004
River =Bumble Bee Reach = Vlasek f 50' dovmstream of Should Bee, 240' upst RS = f 1
1
1
1
c ~
0
'~
'm 1
1
1
1
t00
1
1
1
c 1
0
a~i ~
IL
1
1
1
t00
1
1
1
c ~
0
A
R
~ 1
w
1
1
1
160
Legend
EG PF l
Crit PF S
WSPF1
Ground
Bank Sta
~~
EG PF 1
Ctit PF 1
WS PF 1
-.--
Ground
•
Bartk Sta
~~
EG PF i
WSPF1
Crit PF 1
----~-
Graund
•
Bank Sta
150 206 250 300 390 auu 4d0
station (ft)
W.E. Vlasek, Lats on Should Bee existing w/ fill 3/10/2004
River =Bumble Bee Reach = Vlasek SW of fill at bend of Bumble Bee Creek RS = 10
150 200 250 300 3bU 4uu a~0
Station (ft)
W.E. Vlasek, Lats on Should Bee existing w/fil! 3/10/2004
River =Bumble Bee Reach = Vlasek South of F~71, closest to TX 39 RS = 9
150 200 250 300 sou auu tJ0
Station (ft)
SGA Consulting Services
Plastic Piping Systems
Groundwater Hydrology -Water Wells
981 Brookside Dr.
Spring Branch, Teas 78070
April 1 I, 2004; 200
Catherine Fox
P.O. Box 470
Ingram, Texas 78025
Subject: Review of the Hydrology of Bumble Bee Creek at Flood Stage
Dear Mrs. Fox,
1 reviewed the subject report prepared bti~ Vordenbaum Engineering, Inc and it looks reasonable
for the limited analysis performed. To do this work I had to familiarise im~self with the Corp of
Engineers computer program HEC-RAS version 3. L 1, which is available without charge from
their website. Because of the limited time available for this anah~sis I was not able to do some
modeling that would tweak the output a little better. However, I believe this report w-ili show
that we cannot model the flow in Bumble Bee Creek without taking into consideration the water
level in the Guadalupe River. It was also necessar<° to become familiar with the program to
evaluate the data and conclusions drawn by VEI.
The case modeled by Mr. Spraggins of VEI does represent the case of a flash flood on Bumble
Bee Creek before a signifcant rise has occurred in the Guadalupe. I duplicated this case to be
sure the older version of the program, which VEI is using, is compatible with the latest version
w°e downloaded this week. I used ail the data as presented in the VEI report dated March 1 t,
2004 and duplicated the results in the report. Ho~v°ever, I could not justify the boundan°
conditions and ~~-ould like mare information an the determination of the input values of slope.
The HEC-RAS instructions say to use the slope of the channel bottom in the absence of energy
data and this is what I did in later cases by scaling the VEI drawing No. Cl, which you supplied
to me. I could not determine the slopes used by VEI in this manner and presume they have
information withheld from the report or did not supply a scale drawing - although a scale is
noted on the drawing. The program is sensitive to the slope used for the downstream boundary
condition and if a zero slope or a yen- small value for slope is used, the program will show the
creek backing up and flooding the lots. This is a mathematical problem solved 6y adding more
cross-sections down stream, which the error analysis in the VEI report stated is desirable for this
case.
The conclusions presented b~° VEI based on this one case are reasonable. The water level in the
creek is far below the elevation of the lots so adding fill on the three lots has no effect on the
flow dynamics.
To investigate the influence of the Guadalupe I added a reach and junction to the schematic
(required by HEC-ItAS for any analysis} to include the Guadalupe. This schematic is shown in
Catherine Fox April 11, 2004
Figure 1. Since I do not have channel geometry for the river I created a rectangular channel and
generated a race curve for boundan~ conditions using USGS data. The hood data is sensitive to
the actual elevation of the bottom. of the river but as sve will show the flood record is such the
river water levels in the Guadalupe generated by the model are not uncommon and far below the
flood of record that occurred in 1932. The rate curve used is sho~~n in Figure 2. The flood of
record caused the Guadalupe River to crest 36.6 feet above normal upstream of Bumble Bee
Creek at a flow rate of 206,000 cfs.
The Bumble Bee Creek flood conditions at two different flow rates in the Guadalupe using the
I00 year flood flow for Bumble Bee Creek calculated ln~ VEI are shoti~n in Figures 3 through 8.
The elevation of the water surface in the Guadalupe was 4 feet over Highway 39 at 53,1100 cfs
and less than 1-foot over the pavement at 40,000 cfs. As may be seen, the water backs up at
crass section 11 well above the river level and goes from critical (rapid flow) in the VEI analysis
to sub-critical flotiv and about 5 feet deeper when taking the Guadalupe flood stage into effect.
At a Guadalupe RiZ•er elevation of 1727-feet {53,1)1X) cfs), Bumble Bee Creek just floods the Fill
at elevation 1735-feet at atl sections.
We did not consider the effects of fill versus no fill on erosion as there is a subroutine in HEC-
RAS for this purpose that I did not have time to study. HEC-RAS is a comprehensive program
and it seems VEI could have done a much more detailed analysis with little added expense
considering their famiiiarihT with the software.
The main result of the analysis eve performed is that the entire three fats 42, 43 and 44 on tivhich
the Fill has been placed, will be under water from back flow from the Guadalupe in events less
than the flood of record with no flow at all in Bumble Bee Creek There is anv number of
combinations of creek versus river flood that could put these lots under water even with the
present fill in place.
If you have any questions you may reach me by telephone at 830-885-5720, by Fax at 830-885-
5719 or by E-mail at s1e_c,e ct,>.~i~f.c.~;1 :c~~~~t. Let me know ~~=hen you would like me to return the
documents to you that you furnished for this project.
Very truly yours,
~_
.. ~
Stephen C. Grigory, P.E.
"" _.=~i~
.~.
~`.. ~...r..'
~~~ r
~~~
2
Catherine Fox
April
11
Vlasek
c~' 10
9 8.5
umk:, e ~ieP
Upper
l 1, 2004
Figure 1 Schematic of HEC-RAS ~~3.1 With Guadalupe Riti~er and Bridge Channel
Bumble Bee Creek Guadalupe at 53000 cfis Plan: Plan 02 4/11/2004
Guadalupe Upper Reach
1730 ..~ Legend
1725 j ~-'`~ ~ ! W.S. Elev
j ~~,• i ~
~ 1720 ~ ~.-'~ ~`
~. ~ ~
i /,.i
w 1715 ~ ~~
i ~.
v;
~ 1710 r~~~
'i ~', , ,~
1705 1 .--'
i'
1700-~---~ --- ~ -~ --
0 10000 20000 30000 40000 50000 60000
Q Total (cFs)
Figure 2 Rate Curve Used for Guadalupe Reach 13oundarv Conditions
-~~1
,~ ~. ~A 4 ~
~ ,~ . ~` '~ ,r' s
r
- - <`I ~
?~,
* r!
• f~ Y ..
~..-...r~ ~~
~ ~
~ f,
~~1i;,~'r3 as
3
Catherine Foh
Bumble Bee Creek Witte Guadalupe at 40,000 cfs Plan: Plan 02 4111/2004
150' Downstream of St~auld Hee, 240' upstream of bend
D35 ~--- - D35 -=~ - - - 05 .~__
1740{ Legend
1735 ~ i. EG PF 1
1 _.. _._.__......._..
WSPFi
~ 1730 ~'' _~:_: . ->..:_.__ .__..~..- --..,.:..___:~.---- -_._...,-_:_...._,.
c ; Cnt PF 1
`~ Ground
1725 ~
w I Bank Sta
~~ -- - - ~
1720~~
a
1715 ~ , - , -r - , r-,T,-,~- -~~T~-T-~ - ~ ---,
100 150 200 250 300 350 400 450
Station (ft} i
Figure 3 Cross Section I l on Bumble Bee Creek with Guadalupe Flow at -10,000-cfs
Bumble Bee Creek With Guadalupe at 40,000 cfs Plan: Plan 02 411112004
SW of Fill at bend of Bumble Bee Creek
I
i~---- _ _._ 04 .. --~ .. -~.04~
1740	0 legend 'I
1735 ~	' EG PF 1 ~
	WS PF 1
1730
~	Crit PF 1
1725
~	
~ Ground
m
w 1720	' ~
Bank Sta j
1715
1710 T - T--~
50 100 150 200 250 300
Station (ft)
April l 1, 2004
Figure 4 Cross Section IQ on Bumble Bee Creek with Guadalupe at 40,0(10-cfs
Fr"" ,~ ~~
#• ~ c
!max ,;° ~ r ~'-. '~
~ ~~ ~~~.
~~~ ° `:

Catherine Foy
April 11, 2004
Bumble Bee Creek With Guadalupe at 40,000 cfs Plan: Plan 02 4!11;2004
South of Fill Closest to Texas 39
~--- --.04 -=r~.04-~-- - - .065 --__'~
1740
		~ Legend ~~	
		_ __
f	
	17351	!	
	a	~ EG PF	
	17301	~ WS PF 1 '	
~		I I	
0	1725	Crit PF 1	
-		-	
	1720	~--
' Ground i	
w	1715	! Bank Sta	
17101
,~~~'
~T~
220
Figure 5 Cross Section 9 on Bumble Bee Creek with Guadalupe Flow at 40,000-cfs
Bumble Bee Creek Guadalupe at 53000 cfs Plan: Plan 02 4/11/2044
150' Downstream of Should Bee, 240' upstream of bend
	1740
	1735
c	1730
0
.~	
	1725
w	
	1720
'	1715 ~---r-r-r-r
	100 150
200 250 300
Station (ft)
Legend
EG PF 1 ~~
WSPF1
Crit PF 1 j
- I
Ground
i
Bank Sta
E
350 400 450
Figure 6 Cross Section ll on Bumble Bee Creek with Guadalupe Ftow at 53,000-cfs
l,, ~ y. S~ ~'. *`k~'y, 'fir:.
i~
~.,.. ~ ~ <..: e:
., ~. ,.,,,r~;.~
r
Q{ ..~
~~~ c
5
80 100 120 140 160 180 200
Station (ft)
Cathe
Figure 7 Cross Section 10 on Bumble Bee Creek with Guadalupe Flow at 53,000-cfs
1740 ~
1735 i
1730
c 1725
0
.~
~ 1720
w
1715
1710
1705
60
80 100 120 140 160
Station (ft)
Legend
EG PF 1
WSPF1
Crit PF 1
Ground
s
Bank Sta
180 200 220
nne row Apri! 11, 2004
Bumble Bee Creek Guadalupe at 53000 cfs Plan: Plan 02 4/11/2004
SW of Filf at bend of Bumble Bee Creek
1740 -_ 0 --
7 I-_ _Legend
1735 ------------------__.._~___._-_~._-__-___----._____... __ 1
i EG PF 1
___ _._~
WSPF1 ~
~ 1730 ~ I
i
c - ? Crit PF 1
1725-. __-__--_._____-_-.---.__-. _.._.,._ ~-
W j Ground
u' 1720 ~ IL Bank Sta
1715
1710 -- -- ~__ ~.. , _ .,_ _ ~ - r--~~,-, --r--; - -_ _- ~~
50 140 150 200 250 300
Station (ft)
Figure S Cross Section 9 on Bumble Bee Creek with Guadalupe Flow at 53,000-cfs
",~ °~'' <
a~ ~ ';$a
~,, x .~ ~.
~... i~, ,
~ .~
a~ ;~
Bumble Bee Creek Guadalupe at 53000 cfs Plan: Ptan 02 4!11/2004
South of FiII Closest to Texas 39
~---- 04 -_~ _= - -~ .04 ~-~- -.065
6
~~
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