HomeMy WebLinkAboutDrainage Letter1
December 14, 2011
7607 Eastmark Drive, Ste. 252 <77840>
P.O. Box 9253, College Station, TX 77842
Off /Fax: (979) 764 -0704
email: civil @rmengineer.com
City of College Station
1101 Texas Avenue South
College Station, TX 77842
RE: University Oaks, Section Two — Replat of Lots 15, 16, 20, & 24R — Block Five
No Adverse Impacts — Drainage Letter
RME No. 220 -0446
To Whom It May Concern:
The purpose of this NAI Drainage Letter is to illustrate that the proposed construction on the
existing Lot 20, Block Five of the University Oaks, Section Two subdivision will not cause any
upstream or downstream adverse impact per Section 13- 5.E.11.a.1 of the Flood Hazard
Protection Ordinance. The five (5) "test" of this ordinance are listed below and the appropriate
response or data appropriately follows.
These test results were determined by two (2) pieces of information. First, a Preliminary Lot
Layout/Grading Plan was developed for the proposed lot re- development. Second, the HEC-
RAS model, obtained from the City of College Station, was updated as discussed below.
• Corrected Effective Model — The original HEC -RAAS model did not include a "blocked
obstruction" at the existing/proposed structure location (RS 2900.00). Therefore the
model was revised to include the existing residential structures footprint. Hydraulic data
generated from the "Corrected Effective Model" will be the benchmark data used for
comparison with proposed conditions;
• Proposed Conditions Model — Utilizing the "Corrected Effective Model" RS 2900.00 was
updated to reflect the proposed residential structure (as illustrated on the Preliminary Lot
Layout/Grading Plan) intended to be constructed on Lot 20 (replatted to Lot 20R1 &
20R2). A comparison of this models data to the original model will illustrate whether the
five (5) test of the NAI ordinance are being satisfied.
No Adverse Impact Requirements:
a) An increase in the base flood elevations. In the event that base flood elevations are not known at the time of
submitting the information required herein, base flood elevations must be determined; As illustrated in the
column identified as "A" the water surface elevations calculated do not illustrate any increases
in the BFEs;
b) Creation of additional areas of special flood hazard area; The columns identified as `B" and "C"
illustrates the point at which the studied water surface elevation intersects with the existing
CD1- 220 - 0446 -L02 Page 1 of 2
grade. Therefore a comparison of these pieces of information will reveal whether or not eh
SFHA has changed. As calculated by the HEC -RAS model the flood limits are either at the
same location or reveal a nominal decrease;
c) A loss of conveyance capacity to that part of the special flood hazard area that is not in the floodway and
where the velocity offlow in the base flood event is greater than one (1) foot per second This area can also be
approximated to be either areas within one hundred (100) feet of the boundary of the regulatory floodway or
areas where the depth of from the BFE to natural ground is eighteen (18) inches or greater; The column
labeled "D" reports the cross - sectional surface area of the left overbank. The left overbank is
only reported because the proposed changes occur on this side of the creek. No change in
conveyance capacity is analyzed;
d) A loss of base flood water storage volume to the part of the special flood hazard area that is beyond the
floodway and conveyance area where the velocity offlow in the base flood is equal to and less than one (1) foot
per second without acceptable compensation as set forth herein. Acceptable compensation for the loss of
storage volume requires a demonstration of cuts and fills, must be mitigated on -site and must demonstrate no
net fill. In general, excavation within the special flood hazard area and below the base flood elevation is the
only acceptable method of mitigation of fill placed below the base flood elevation in the special flood hazard
area; and Same information as reported in NAI Item "c ";
e) An increase in base flood velocities. In the event the future conditions flood data is known at the time of
submittal, then the future conditions modeling must be used in lieu of the base flood modeling. No additional
future conditions are foreseeable at this time or modeled. Therefore, as illustrated in the
column identified as "E" there are no increases in flood velocities. Nominal decreases in
velocity are calculated.
Based on the results listed above, attached updated HEC -RAS model output data, and the
Preliminary Lot Layout/Grading Plan it has been determined that the proposed improvements
will not result in upstream or downstream negative impacts.
Please do not hesitate to call if you have any questions.
Sincerely,
'S /ONF L
Rabon A. Metcalf, P.E. No. 88583
Texas Firm Registration No. F -4695
rabon @rmengineer.com
CD1- 220 - 0446 -L02
OF TE,
l\
7607 Eastmark Drive, Ste. 252 <77840>
P.O. Box 9253, College Station, TX 77842
Off /Fax: (979) 764 -0704
email: civil @rmengineer.com
Page 2 of 2
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.9
Trlb A
ITdb A
1Tdb A
Tdb A
Tdb A
TdbA
1TdebA
TM A
TdbA
Trlb A
TdbA
1
Tdb A
Tdb A
TdbA
Tdb A
ITdbA _
d db A
ITdbA
Tdb A
Trlb A
Trlb A
Tdb A
Tdb A
Trlb A
Tdb A
TrIb A
Tdb A
TrIb A
ITd 1
Tdb A
Tdb A
TdbA
TdbA
Mb A
Reach
Tdb A
4592.60 1
4592.80 -1
4715.76
4718.76
4940.32
4940.32
8159.80
5159.80
15500.44
15500.44
5595.93'
5595.93'
6691.42
5891.42
5713.93•
5713.93'
5738.44'
5736.44•
5758.95' - 1
5758.95•
5781.46
5781.48
15802.13
5832,29
1
583229
5917.03"
6917.03'
8001.77
6001.77
'6071.
'
1814221'
6212.44
814221"
RNer Ste
8212.44
[PF 1
PF1
'PF 1
1PF1 __
PF 1 1
PF 1 __ - -_ II
1PF 1
Pp 1 _____
PF 1 1
PR J
PF 1
PF 1
PF 1
PF 1
PF 1 I
PF 1
PF 1 - --
PF 1
PF 1
PF 1
PF 1
PF 1
PF 1
PF 1
IPF 1
PF 1
PF 1
PF 1
PF 1
PF 1
IPF 1
IPF1
IPF 1
Profile
IPF 1
Proposed Model 1
IRevElfacdve
1RevEtfective I
Proposed Model
RevEffecilve
;Proposed Model _ J
Proposed Model
1
�1 R�EBective
1RevEMectIve
;Proposed Model_
Proposed Model
I RevEffecllve
RevEffecllve
Proposed Model
Proposed Model
RevElfecllve
RevEffecllve
Proposed Model
Proposed Model
RevEBsotIve
RevEffective
Proposed Model
Proposed Model
RevEBective
RevEJfecllve
Proposed Model
Proposed Model
RevEBecl ve
RevEffecttve
Proposed Model
Proposed Model
Proposed Model
RevEffec6 e
Plan
RevE8ective
432.501
432.601
432.501
432.50
432.501
F- 432.50
432.50
432.50
-_ - -- 432.50
432.50'
432.50
432.60
Culvert
432.50
432.60
UU
294.80
294.801
VU
gg
294.80
E
g
294.80
294.80
a Total
(as)
294.80
1 432.501
1 432.50
I 432.50
L_- 1
I 432.50
432.50'1
289.001
290.00'
290.001
292.00 295241
I 292.00: 295.241
295.551 300.12'
1
298.551 _ 300.121
296.001
296.00',
296251
I - 2982511
296.501
298.501
- - - - 298.751
- --
296.76
297.001
297.001
297.501
297.50,
298.751
298.75',
300.00
1
300.001
301.334
I 301.331
302.671
302.87
$s
MInChEI
(8)
~ 293. 7'1
1 - -- 29367
I 294.18
294.181
I - 300.97
1
300.97
301.78
301.78
301.781
301.78:
I 301.80
I 301.80,
302.33
302.33
! 303.13
1
303.13
1 _ 303.82
ra
304.671
304.571
304.881
304.881
305.221
305.221
308.171
1 I
306.174
307.38',
307.38,
W.S.01ev I
( I
295.24
296.24
•
i 300.18
299.921
301.841
301.84'',
I 302.581
302.881
301.85
301.851
Cdt W.S.
(8)
293.95
293.95
1
_ 294.24
294.241
r 295.781
295.78'1
300.18
-- -- 300.96,
300.981
1 301.31
, 301.31
301.88
301.88
302.04
302.04
302.471
30247
303.13
1 303.13
, 303.82
, 303.82
303.84
303.84
1 304.87'
304.871
305.241
I 305.241
306.19
306.19
307.38
307.38
Elev
I 0.003243'
0.003244
0.0023491
0.0023419
1 0.0307431
1 0.03 470 3
0.014890
0.014890
0.001145
1 0.001145
1 0.010874
0.010874
0.003540
0.003540
1
0.009846
- - -- 0.028332
0.028332
0.038839
0.038839
0.032527!
0.032527
0.0232921
0.023292
_ -- 0.003489
0.003489
f 0.0031001
0.003100
0.011028
0.011028
0.017095,
0.017095'1
0.018803
0.016803
E - O,
L - _ - 'S'!61_ -J
3.00
3.011
2.181
2.18,
8.81
6.811
1 3.32
3.32
- -- 1.81
1.81
5.31
5.31
3241
324
4.68
4.86
8.77
6.77
7.21
7.21
6.71,
8.711
1.08
1.081
0 ,
0.39
0.391
0.811
0.61
0 0
0.64!
0.64
Vel Chnl
(Ns)
272
- -- 272.911
- 1
313241
313261
111.081
111.08
- -_ -- 231.28
231.28
_ 458.14
1 1 458.14
r 174.48
174481
157.74
157.741
81.90
81.90
65.29
6529
I - _ - - -- 75.17
1 __ _ 75.17
I 378.26
(
378.26
370.29
370.29
390.34
390.34
311.43
- - --- 311.43
H . _ 307.84
L 307.64
1__ 339.32
339.32
Flow Area
000_
137.581
1
_ -- - 22029
220.291
107.761
107.761
1 185.45
185.45
188.04
I_ _ 186.04
202.52
202.52
135.16
135.18
112.17
112.17
84.28'
84.28
80.981
80.981
129.64
129.841
I 288.09
288.09
L 169.03
159.031
�_ -- 205.87
205.87
201.22
0
i
1r
1
I0 0
Zl v
_ 219.981_ 0.07
19.96 0.07
0v 0
1 252.181 0.07
252.18 ___ 0.07
0_07
L__
Top Width Frauds ft Chl
(ft)
- 0.281
0.261
0.751
0.761
0.451
0.451
0.15E
0.15
0.471
0.47
0.43
0.43
0.70
0.701
0.77
0.771
0.09
0.04
1 ___ _ 0.44
0.03
0.03
0.08
- 108.571
- 108.671
- 207.701
207.761
•94.621
- 94.62
- 192.521
- 192.52
- 144.38
- 144.36
- 172.38
- 172.38
47.51
47.511
-42.08
42.06
41.48
41.48
- 243.32
87.08
-87.08
- 115.43
- 115.43
1 - 115.87
I - 115.67
-
L__ - -- 110.67
__ - 110.67
Sla W.S. LR
(8)
30.991
1
30.99
12.591
12.591
13.14
13.141
7.511
7.511
21.681
21.881
1 30.13
30.13
84.66
84.661
42.22
42.22
19.50
19.50
42.77
71.86
71.95
90.24
9024
1 85.36
85.36
109.31
109.31
135.30
135.30
Sta W.B. R t
(8)
3.881
- -
3.88
T
4.021
4.02
4.59
4.59
5.181
5.181
6 6.11
1
6.45
8.691
8.69
6.70
6.70)
I 6.711
6.71,
6.90 - 1
7.19
7.51
7.511
7.54
I _ _ 7.86
1 7.78
1 7.76
SA Leo
I (acres) 1
•
i
•
Trtb A
1 Trib A
ITrIbA
iTdbA
Trlb A
Tdb A
ITrlb A
Trlb A
Trlb A
Trlb A
ITrlb A
Trlb A
Tdb A
rib A
Tdb A
1 TdbA
Trlb A
Trlb A
Tdb A
Tdb A
1TrIbA 1
Trlo A
Trlb A
]Tdb A
Trib A
Trlb A
Tdb A
Trlb A
Trib A
I J
Reach
N !
2968.87'
2988.87'
3037.34'
3037.34'
1 3106.02'
1 3106.02'
13174.69' --
1 3243.37
3243.37
3287.37
3368.05
3287.37
3368.05
4
3501.11'
3501.11'
13587.86
13648.25'
13646.25'
3724.85
3724.85
392760 -- l
3927.80 - J
4421.41
1.4421.41
River Ste
PF 1
PF 1
PF 1
PF 1
PF 1
PF 1
1PF1
PF 1
1_P_F1
PF - 1
PF1
PF 1
IPF
PF1 1
PF 1
PF1
PF 1
PF1
PF 1
PF 1
`PF 1
PF 1
PF 1
1 PF 1
IPF 1
PF 1 _ - -_ - - 1
FF1
PF 1
PF t
Profile
RevE8ec6ve
[Proposed Model
RevE6eaive
Proposed Model
RevE8ectve
Pro. • ed Model
!Proposed Model --
r RevEffective
RevE8ective
Proposed Model
I RevElfective
Proposed Model
Proposed Model
Proposed Model
RevEffective
1 RevE8eclIve -- -
RevEtlective
Proposed Model
RevE6ecttve
Proposed Model
RevEfect ve
1 RevE6ectivve
!Proposed Model
Proposed Model
RevEffscfve
RevEffecWe
Proposed Model
RevEffective
Pro... -. Model
0[191 - - - 1
01'L9L
749.90
749.90
749.90
749.90
749.90
L- -
r 749.90
749.90
749.90
749.90
749.90
672.20
____ 67220
672.20
87220'
672.20
87220
872201
672201
672.201
67220
672.20
87220
87220
432.50
432.60+
432.50
432.50
Q Total
(cfe)
282.00 - - - -_ 289.70'.
- -- 282.00 289.701.
282.00i 289.93
282.00 289.93
1
282.00
282.00
282.00
L 282.00
1
t -- 282.00
282.00
L 282.00
282.00
282,00
282.00
282.001
282.67''
282.67
283.33
283.33.
m N
♦
S
N
o ♦
8
284.001
284.00,
284.001
284.00
284.001
284.00
288.00
288.00
Min Ch El
(ft)
290.16''.
290.16
290.431
290.43
290.73'.
290.73'
291.071
291.07
- - - -- 291.08,
291.121
291.08
291.13
I 291.17
291.17
29121
201.21
7 291.261
-- - -- 291.31
291.301
_ 291.341
1
- - 1
291.341
291.37
291.37
293.21
29321
W.8. Elev
r (ft)
1 28522
I 285.22
287.27
287.27
286.49
286.49
Cr8 W.S.
(ft)
291.60
291.49
283.35
29
E.O. Bev 1 1
289.72
j --- 289.72
289.95
289.94
F 290.18
290.18
290.45
•
L_ 290.46
1 291 10
291.10
291.11
L 291.11
291.15
291.16
1 - -- 291.19
291.19
1 291231
29123
1 291.27)
291271
291.321
291.31
291.34
291.36
0.003744'
0.0036301
0.0036251
0.003641''
L 1 0.004198 0.571,
. 0.0042121 - - - - 1.
0.57
0.0048361 0.63.
L
1_ I
0.004823; __ 0.63
r
I 0.0055111 0.69
L_ 0.0055211 0.69
0.0062771
188000
1996000
0.0008301
0.000628
i i
0.000638
0.0008401
I-
0.0006191
I 0.0006171
O O
0.000288
0.0002881
0.0045251
0.0045451
0.0060921
0.0060881
_E.O.Slope,�
(Brh)
051,
0.51.
-__ _ 0_721
2.34
2.34
1.91
1.91
1.91'1
_ __. -1.911
1.88'
1.761
1.761
1.43'1
1.431
1.11'
1.11,
Val Chni i Flow Area 1
1_ (We) I (sq ft)
949.291
948.071
8581k5
858.07
783.03
L_ 1
763.65
r 889.41
668.99
578.27
676.641
808.511
809.411
604. 05]
803.151
807.111
80624
821.05]
1 821.88
1176.36
1177.35
245.451
245.58
L __249211
253.711
1 302.141
301.921
292.18
1 292.00
1
284.88
286.051
282.95
282.81
290.49
290.80
302.95
302.64
.. 234.341
23454+
239.25
- - -- 239.12,
r _ _ 237.76
E 237.85
237.021
1 1
1 2371
1 275.42
276.34
297.85
1
29722
1 - -- '
184.551
164.341
161 25
' 161.2
1 Top Width .1
I (ft) I
0.041
-- -.. 0.04
0.041
0.04
0.05
0.05''1
- - -_ -_
0.05'
0.05
0.151
0.151
0.12
0,12
- - - 0.131
0.131
0.13
0.131
0.1
0.12
0.10
0.10
0.081
0.081
O O
i i
0.381
T
' Froude q Chl
-272.58
- 272.681
- 268.381
- 25821
- 244.76
- 244.61
- 232.92
- 233.06
- 225.29
225.18
- 226.26
1
1 _226381
- 238.60
- 238.28
- 188.74
- 168.861
-_ -- 156.831
- 156.561
-- -- - 138.67
- 138.52
- 117.91]
- 117.94
147.111
- 147.091.
- 176.61
- 178.641
- 167.41'.
-167.38
I -_ - -- - 147.591,
--- -- - 147.60'.
Sts W.S. Lft_
!1
41.141
41.14 -- -t
43.761
- -_ -- 43.711
-- I
47.431
47.391
1
51.96
51.99
57.651
57.631
I.
84.24
64.34
64271
65.801
I _ 82.62
L 82.561
99.19',
_ - -._ 99.131
119.111
I
119.181
128.31
1 128261
121.24
121.28'1
59251
L ._
-_- 59.12
r- 101_571
101.58
r Ste W.S. Rpt SA Left 1 I
1 - - -- (ft) - -- (acres) - -J
-- ._ - - - -- 0.17
.. 0.17
0.38
0.38
1
O
0.60
O
0.83
053
1.08
1.31
1.31
1.51
1.73
1.73
+
- -_ 1.94
1.94
- -1
2 �
2 41
2.41
2.77
1 2.7131
41 u