HomeMy WebLinkAboutAppendix M - Preliminary Technical Hydrology and Hydraulics ReportMethodology Used
The San Bernardino County Hydrology Manual was used to determine the run-off peak flowrate
for storm drain produced by the 100 -year storm event when comparing the existing and proposed
conditions. All calculations are in accordance with the San Bernardino County Hydrology
Manual and Technical Guidance Document for Water Quality Management. Based on
WebSoilSurvey database, the proposed site is comprised of mainly Chino Silt Loam, which is
classified as hydrologic soil group C. Refer to Appendix E for more in formation.
Summary
Per the San Bernardino County Hydrology Manual, a hydrology analysis has been completed for
the 100 -year storm events for the proposed conditions. The post construction run-off is less than
the pre-construction run-off, as shown in Appendix D . There is no additional impact to the
downstream facilities. I n fact, the addition of an onsite water quality retention system will further
reduce peak flows. Therefore, no additional stormwater infrastructure is necessary as a part of
the Fontana Warehouse development.
Refer to Appendix A for the Southwest Industr ial Park Specific Plan Storm Drain Master Plan
and Appendices B and C for Existing Hydrology Exhibit and Proposed Hydrology Exhibit,
respectively.
Appendix A
Southwest Industrial Park Specific Plan
Storm Drain Master Plan
Appendix B
Existing Hydrology Exhibit
Appendix C
Proposed Hydrology Exhibit
Appendix D
Runoff Calculations
G0 g3@/336)&F A’&F En:. .7MZ3-
C
,C
V#I
*,
C"61I6C.6NZ 66
6 ,6 666 66 Z6
RZ1.ZZW6 616ZS666666C1%QWof+G
J 0.
o /
CZM
F&)
_#1@F&’q
_#
5 .
6
3
-
@,6
1&E
Z
M V666CS MZ)7 3M .6Z63 .6,36.66.6 6 ..6AC_’_M 31’)8 *.(F
3B+";+$3,B(%,(;3*&
,, -.--F ’F)F8F*F.F
"*,(3B+0+*Y;*(-
B(*B;+9B,(3+$,(0$
BB B9*aJJJJJJJ
9+BN*3 B$3,B(aJJJJJJJJJ
-*$+
,(*
=
<
$$22$4 $
<1;9+!2@72@*
3))).*B5_a B]QV$&Z
a "
Y Y WUd’L"
_
K 1= ’[H .T @ g
[ 1 J
U2
J
1+7
B JP
F-
.+7
$W
1
\\-B$B PX &.H S e BN #F@5
2
,*[
-H*)C5_-V
_#J &q,’&@
C
.+
V
Z C #
B
B+,
B1B’(=1+#B
,(0,3+$3,B(+$3*0B+9*+?,B;$+*$%0&,!Q
,(0,3+$3,B(+$3*0B+
9*+?,B;$+*$?*+;
;+?*(;*+2$4 $
0 <@(’
+-
3))).*B5_a B]QV$&Z
a "
Y Y WUd’L"
_
K 1= ’[H .T @ g
[ 1 J
U2
J
1+7
B JP
F-
.+7
$W
1
\\-B$B PX &.H S e BN #F@5
2
,*[
-H*)C5_-V
_#J &q,’&@
C
.+
V
Z C #
B
B+,
B1B’(=1+#B
,(0,3+$3,B(+$3*0B+9*+?,B;$+*$%0&,!Q
,(0,3+$3,B(+$3*0B+
9*+?,B;$+*$?*+;
;+?*(;*+2$4 $
0 <@(’
+-
Appendix E
FEMA Flood Insurance Rate Map
Appendix F
Construction Documents