Prepared For: Larry H. Miller LHM Thornton Landmark Towers 10289 Quivas Street Thornton, Colorado Anderson, Wahlen & Associates, Inc. 2010 North Redwood Road Salt Lake City, Utah 84116 Phone: (801) 521-8529 Fax: (801) 521-9551 Project #: 14-116 Date: December 27, 2016 Final Drainage Report 1/17/2017
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Prepared For:
Larry H. Miller
LHM Thornton
Landmark
Towers
10289 Quivas Street
Thornton, Colorado
Anderson, Wahlen & Associates, Inc.
2010 North Redwood Road
Salt Lake City, Utah 84116
Phone: (801) 521-8529
Fax: (801) 521-9551
Project #: 14-116
Date: December 27, 2016
Final Drainage Report
1/17/2017
December 30, 2016
City of Thornton, Colorado
Engineering Department
Re: Final Drainage Report
To Whom It May Concern:
AWA is submitting this Final Drainage Report for the LHM Thornton Landmark Towers project
located at 10289 Quivas Street, Thornton, Colorado.
This report includes, pre-development conditions and peak release rates as well as post-
development peak release rates for this site. In addition this report provides mitigation options
and detention per City standards and regulations. All calculations included in this report follow
the City of Thornton – Standards and Specifications Manual which references the Urban
Drainage and Flood Control District (UDFCD) Manual Volumes 1, 2, and 3.
If you have any questions regarding this report, please feel free to contact me, Arverd Taylor, at
“________ hereby certifies that the sewer and water systems for Landmark Towers will be constructed
according to the design presented in this report. I understand that the City of Thornton does not and
shall not assume liability for the sewer and water system designed and/or certified by my engineer. I
understand that the City of Thornton reviews utility plans, but cannot, on behalf of Landmark Towers,
guarantee that final utility design review will absolve ________ and/or their successors and/or assigns of
future liability for improper design. I further understand that approval of the Plat and/or Development
Permit does not imply approval of my engineer’s utility design.”
Attest:
“I hereby certify that this report (plan) for the Final Utility Design of Landmark Towers was
prepared by me (or under my direct supervision) in accordance with the provisions of the City of
Thornton Standards and Specifications for the Design and Construction of the Public and Private
Improvements for the Responsible Parties thereof. I understand that the City of Thornton does
not and shall not assume liability for utilities designed by others.”
XRegistered Pro fession al En g ineer
State of Co lo rado No. ____________________
XName of Respon sib le Party
XNotary Pu b lic
XAuth orized Sign atu re
Table of Contents GENERAL LOCATION MAP ............................................................................................................................. 1
Urban Drainage and Flood control District (2016, January). Urban Storm Drainage Criteria
Manual – Volume 1. Retrieved from http://udfcd.org/volume-one
Urban Drainage and Flood control District (2016, January). Urban Storm Drainage Criteria
Manual – Volume 2. Retrieved from http://udfcd.org/volume-two
Urban Drainage and Flood control District (2016, January). Urban Storm Drainage Criteria
Manual – Volume 2. Retrieved from http://udfcd.org/volume-three
United States Department of Agriculture, Natural Resources Conservation Service (n.d.). Web Soil
Survey. Retrieved from https://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx
FEMA (n.d.). FEMA Flood Map Service Center. Retrieved from http://msc.fema.gov/portal
APPENDIX I WEB SOIL SURVEY (SOIL CLASSIFICATION)
Hyd
rolo
gic
Soi
l Gro
up—
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
d D
enve
r Cou
ntie
s, C
olor
ado
(LH
M -
Thor
nton
)
Nat
ural
Res
ourc
esC
onse
rvat
ion
Serv
ice
Web
Soi
l Sur
vey
Nat
iona
l Coo
pera
tive
Soi
l Sur
vey
12/2
6/20
16P
age
1 of
4
4414610441464044146704414700441473044147604414790
4414610441464044146704414700441473044147604414790
4991
1049
9140
4991
7049
9200
4992
3049
9260
4992
9049
9320
4993
5049
9380
4991
1049
9140
4991
7049
9200
4992
3049
9260
4992
9049
9320
4993
5049
9380
39° 5
2' 5
9'' N
105° 0' 37'' W
39° 5
2' 5
9'' N
105° 0' 25'' W
39° 5
2' 5
3'' N
105° 0' 37'' W
39° 5
2' 5
3'' N
105° 0' 25'' W
N
Map
pro
ject
ion:
Web
Mer
cato
r C
orne
r coo
rdin
ates
: WGS
84
Edge
tics
: UTM
Zon
e 13
N W
GS84
050
100
200
300Fe
et0
1530
6090M
eter
sM
ap S
cale:
1:1
,330
if p
rinte
d on
A la
ndsc
ape
(11"
x 8
.5")
shee
t.
Soi
l Map
may
not
be
valid
at
this
sca
le.
MA
P LE
GEN
DM
AP
INFO
RM
ATIO
N
Are
a of
Inte
rest
(AO
I)A
rea
of In
tere
st (A
OI)
Soils So
il R
atin
g Po
lygo
nsA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Soil
Rat
ing
Line
sA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Soil
Rat
ing
Poin
tsA A
/D
B B/D
C C/D
D Not
rate
d or
not
ava
ilabl
e
Wat
er F
eatu
res
Stre
ams
and
Can
als
Tran
spor
tatio
nR
ails
Inte
rsta
te H
ighw
ays
US
Rou
tes
Maj
or R
oads
Loca
l Roa
ds
Bac
kgro
und A
eria
l Pho
togr
aphy
The
soil
surv
eys
that
com
pris
e yo
ur A
OI w
ere
map
ped
at1:
20,0
00.
War
ning
: Soi
l Map
may
not
be
valid
at t
his
scal
e.
Enl
arge
men
t of m
aps
beyo
nd th
e sc
ale
of m
appi
ng c
an c
ause
mis
unde
rsta
ndin
g of
the
deta
il of
map
ping
and
acc
urac
y of
soi
llin
e pl
acem
ent.
The
map
s do
not
sho
w th
e sm
all a
reas
of
cont
rast
ing
soils
that
cou
ld h
ave
been
sho
wn
at a
mor
e de
taile
dsc
ale.
Ple
ase
rely
on
the
bar s
cale
on
each
map
she
et fo
r map
mea
sure
men
ts.
Sou
rce
of M
ap:
Nat
ural
Res
ourc
es C
onse
rvat
ion
Ser
vice
Web
Soi
l Sur
vey
UR
L:C
oord
inat
e S
yste
m:
Web
Mer
cato
r (E
PS
G:3
857)
Map
s fro
m th
e W
eb S
oil S
urve
y ar
e ba
sed
on th
e W
eb M
erca
tor
proj
ectio
n, w
hich
pre
serv
es d
irect
ion
and
shap
e bu
t dis
torts
dist
ance
and
are
a. A
pro
ject
ion
that
pre
serv
es a
rea,
suc
h as
the
Alb
ers
equa
l-are
a co
nic
proj
ectio
n, s
houl
d be
use
d if
mor
eac
cura
te c
alcu
latio
ns o
f dis
tanc
e or
are
a ar
e re
quire
d.
This
pro
duct
is g
ener
ated
from
the
US
DA
-NR
CS
cer
tifie
d da
ta a
sof
the
vers
ion
date
(s) l
iste
d be
low
.
Soi
l Sur
vey
Are
a:
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
dD
enve
r Cou
ntie
s, C
olor
ado
Sur
vey
Are
a D
ata:
Ve
rsio
n 13
, Sep
22,
201
6
Soi
l map
uni
ts a
re la
bele
d (a
s sp
ace
allo
ws)
for m
ap s
cale
s1:
50,0
00 o
r lar
ger.
Dat
e(s)
aer
ial i
mag
es w
ere
phot
ogra
phed
: A
ug 3
0, 2
014—
Sep
18, 2
014
The
orth
opho
to o
r oth
er b
ase
map
on
whi
ch th
e so
il lin
es w
ere
com
pile
d an
d di
gitiz
ed p
roba
bly
diffe
rs fr
om th
e ba
ckgr
ound
imag
ery
disp
laye
d on
thes
e m
aps.
As
a re
sult,
som
e m
inor
shift
ing
of m
ap u
nit b
ound
arie
s m
ay b
e ev
iden
t.
Hyd
rolo
gic
Soi
l Gro
up—
Ada
ms
Cou
nty
Are
a, P
arts
of A
dam
s an
d D
enve
r Cou
ntie
s, C
olor
ado
(LH
M -
Thor
nton
)
Nat
ural
Res
ourc
esC
onse
rvat
ion
Serv
ice
Web
Soi
l Sur
vey
Nat
iona
l Coo
pera
tive
Soi
l Sur
vey
12/2
6/20
16P
age
2 of
4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Adams County Area, Parts of Adams and Denver Counties, Colorado(CO001)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
PlC Platner loam, 3 to 5percent slopes
C 5.7 85.6%
UlD Ulm loam, 5 to 9 percentslopes
C 1.0 14.4%
Totals for Area of Interest 6.7 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils areassigned to one of four groups according to the rate of water infiltration when thesoils are not protected by vegetation, are thoroughly wet, and receiveprecipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) andthree dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) whenthoroughly wet. These consist mainly of deep, well drained to excessivelydrained sands or gravelly sands. These soils have a high rate of watertransmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. Theseconsist chiefly of moderately deep or deep, moderately well drained or welldrained soils that have moderately fine texture to moderately coarse texture.These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consistchiefly of soils having a layer that impedes the downward movement of water orsoils of moderately fine texture or fine texture. These soils have a slow rate ofwater transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) whenthoroughly wet. These consist chiefly of clays that have a high shrink-swellpotential, soils that have a high water table, soils that have a claypan or claylayer at or near the surface, and soils that are shallow over nearly imperviousmaterial. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter isfor drained areas and the second is for undrained areas. Only the soils that intheir natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Adams County Area, Parts of Adams and Denver Counties, Colorado LHM - Thornton
Natural ResourcesConservation Service
Web Soil SurveyNational Cooperative Soil Survey
12/26/2016Page 3 of 4
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Adams County Area, Parts of Adams and Denver Counties, Colorado LHM - Thornton
Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin
NOAA, National Weather Service, Silver Spring, Maryland
PF_tabular | PF_graphical | Maps_&_aerials
PF tabular
AMS-based point precipitation frequency estimates with 90% confidence intervals (in
inches/hour)1
DurationAnnual exceedance probability (1/years)
1/2 1/5 1/10 1/25 1/50 1/100 1/200 1/500 1/1000
5-min2.89
(2.24-3.72)4.15
(3.22-5.36)5.26
(4.04-6.80)6.88
(5.18-9.41)8.24
(6.06-11.4)9.73
(6.90-13.7)11.3
(7.72-16.4)13.6
(8.93-20.2)15.5
(9.84-23.1)
10-min2.12
(1.64-2.72)3.04
(2.36-3.93)3.85
(2.96-4.98)5.03
(3.80-6.88)6.04
(4.43-8.32)7.13
(5.05-10.0)8.30
(5.65-12.0)9.98
(6.53-14.8)11.4
(7.21-16.9)
15-min1.72
(1.34-2.22)2.48
(1.92-3.19)3.12
(2.41-4.05)4.10
(3.09-5.60)4.91
(3.60-6.76)5.79
(4.11-8.16)6.75
(4.59-9.75)8.12
(5.31-12.0)9.24
(5.86-13.7)
30-min1.21
(0.942-1.56)1.74
(1.35-2.25)2.19
(1.69-2.84)2.86
(2.16-3.90)3.42
(2.51-4.71)4.02
(2.85-5.66)4.68
(3.18-6.75)5.60
(3.67-8.29)6.36
(4.03-9.46)
60-min0.746
(0.580-0.960)1.08
(0.834-1.39)1.36
(1.05-1.76)1.77
(1.33-2.41)2.11
(1.55-2.90)2.48
(1.75-3.48)2.87
(1.95-4.14)3.43
(2.24-5.07)3.88
(2.46-5.77)
2-hr0.443
(0.348-0.564)0.642
(0.502-0.818)0.809
(0.630-1.04)1.05
(0.800-1.42)1.25
(0.928-1.70)1.47
(1.05-2.04)1.70
(1.17-2.42)2.03
(1.34-2.96)2.29
(1.47-3.37)
3-hr0.319
(0.252-0.403)0.461
(0.363-0.584)0.580
(0.455-0.738)0.753
(0.575-1.01)0.895
(0.667-1.21)1.05
(0.754-1.44)1.21
(0.836-1.71)1.44
(0.957-2.09)1.63
(1.05-2.37)
6-hr0.189
(0.151-0.236)0.268
(0.214-0.336)0.335
(0.265-0.422)0.431
(0.333-0.568)0.510
(0.384-0.679)0.594
(0.432-0.808)0.684
(0.478-0.954)0.811
(0.545-1.16)0.913
(0.596-1.31)
12-hr0.116
(0.094-0.143)0.160
(0.129-0.199)0.197
(0.158-0.245)0.251
(0.196-0.326)0.294
(0.224-0.387)0.341
(0.251-0.458)0.391
(0.276-0.538)0.461
(0.313-0.650)0.517
(0.341-0.734)
24-hr0.071
(0.058-0.087)0.098
(0.079-0.119)0.119
(0.096-0.146)0.149
(0.117-0.191)0.174
(0.133-0.224)0.199
(0.148-0.263)0.226
(0.161-0.305)0.262
(0.180-0.365)0.292
(0.195-0.409)
2-day0.041
(0.034-0.050)0.057
(0.047-0.069)0.070
(0.057-0.085)0.087
(0.069-0.109)0.100
(0.077-0.126)0.113
(0.084-0.146)0.126
(0.091-0.168)0.145
(0.100-0.197)0.159
(0.107-0.220)
3-day0.030
(0.025-0.036)0.041
(0.034-0.049)0.049
(0.040-0.059)0.060
(0.048-0.075)0.069
(0.054-0.087)0.078
(0.059-0.101)0.088
(0.063-0.116)0.100
(0.070-0.136)0.110
(0.075-0.151)
4-day0.024
(0.020-0.028)0.032
(0.026-0.038)0.038
(0.031-0.046)0.047
(0.037-0.058)0.053
(0.042-0.067)0.060
(0.046-0.077)0.067
(0.049-0.088)0.077
(0.054-0.104)0.084
(0.057-0.115)
7-day0.015
(0.013-0.018)0.020
(0.017-0.024)0.024
(0.020-0.028)0.029
(0.023-0.035)0.032
(0.026-0.040)0.036
(0.028-0.046)0.041
(0.030-0.053)0.046
(0.033-0.062)0.051
(0.035-0.068)
10-day0.012
(0.010-0.014)0.015
(0.013-0.018)0.018
(0.015-0.021)0.021
(0.017-0.026)0.024
(0.019-0.030)0.027
(0.021-0.034)0.030
(0.022-0.039)0.034
(0.024-0.045)0.037
(0.026-0.049)
20-day0.008
(0.007-0.009)0.010
(0.008-0.011)0.011
(0.009-0.013)0.013
(0.011-0.016)0.014
(0.012-0.018)0.016
(0.012-0.020)0.017
(0.013-0.022)0.019
(0.014-0.025)0.021
(0.015-0.028)
30-day0.006
(0.005-0.007)0.007
(0.006-0.009)0.009
(0.007-0.010)0.010
(0.008-0.012)0.011
(0.009-0.013)0.012
(0.010-0.015)0.013
(0.010-0.017)0.015
(0.011-0.019)0.016
(0.011-0.020)
45-day0.005
(0.004-0.005)0.006
(0.005-0.007)0.007
(0.006-0.008)0.008
(0.007-0.009)0.009
(0.007-0.010)0.010
(0.008-0.012)0.010
(0.008-0.013)0.011
(0.008-0.014)0.012
(0.009-0.016)
60-day0.004
(0.004-0.005)0.005
(0.004-0.006)0.006
(0.005-0.007)0.007
(0.006-0.008)0.008
(0.006-0.009)0.008
(0.006-0.010)0.009
(0.007-0.011)0.010
(0.007-0.012)0.010
(0.007-0.013)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of annual maxima series (AMS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and annual exceedance probability) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.