HomeMy WebLinkAboutFile Documents.234 W Francis St.0118-2020-BRES (66) Eng i neeri ng3_234 W Francis_0118-2020-B RES
40.DrainageReport.234WFrancis.2021.10.04.pdf(4)
Page: 52
Author: pjm There is a discrepancy in areas
There
ePe eyinareas here. How is PR1 = .158 acres
sr here.58ecrHow lbPR1= File Name: 40.DrainageReport.234WFrancis.2021.10.04.pdf but the area used to calculate
.158 acres but the
area used to calculate The area shown in the drywell detention the drywell detention volume be
/ the drywell decent on
°�a=A. res?AI of PR, volume is the tributary impervious area for o96 ages. An of PR1 drains to
°P°�'� ren drains to the drywell. rn� .,m
Please address. the volume calc. This line has been the drywell. Please address.
- removed per detention analysis below.
. Page: 55
71 __ ;I i Drywell detention volume
80 _I'll IL' Author: pjm calculations need to follow
IllEE File Name: 40.DrainageReport.234WFrancis.2021.10.04.pdf Chapter 5 of the URMP for the
... .. .. , Detention volume has been revised and FAA method of historic
calculated per URMP section 5.6.1. detention. Follow the process
�Wa, Detention volume calculations have been outlined in section 5.m1 of the
URMP. Note the example
added to the hydrologic calculations following section 5.6.1 uses the
appendix. incorrect coefficients to calculate
I in equation 5-1, however the
process is correct.These
calculations needs to be
provided in the report.
Using MHFD detention
spreadsheets, I calculated
detention as 162c which can be
accommodated in the drywell,
the controlled outlet needs to be
designed. Provide calcs on how
the runoff will be controlled to
historic rate of 0.23cfs.
�. mmmm Page: 55
mm®mmm Author: pjm The runoff volume equation
Immo File Name: 40.DrainageReport.234WFrancis.2021.10.04.pdf Bete tion volume for either full
bove does not calculate
TeOae1P°�kill
Detention volume has been revised and detention or detention to historic
calculated per URMP section 5.6.1. release rate, it calculates the
inflow volume for detention.
Ba"°° Detention volume calculations have been
a°„�,,,,,aapo,.4 added to the hydrologic calculations It looks like I and P were mixed
appendix. up in the calculations above for
drywell volume.The result of this
equation should be 0.9 of full
detention (based on the runoff
coefficient)which is roughly
380cf. P= 1.23", I =6.33"per
equation 2-1 and the table
above.
.) =7484.51 Velocity(ft/s) Page: 66
=2.00 Wetted Perim This doesn't match page 9 for
=0.030 Crit Depth,Ye Author: pjm
Top ii;th(ft) File Name: 40.DrainageReport.234WFrancis.2021.10.04.pdf onsite basin runoff. Total runoff
KnownO is .74 or PR1 is .65
;) =0.65 This swale carries overflow from basin
This doesn't match PR-1 0.65 cfs.
page 9 for onsite f
basin runoff.Total RECEIVED
�� /E
runoff is.74 or PR1 is ■ )
65
Section
I L 01/28/2022
ASPEN
BUILDING DEPARTMENT
90.PERMIT.CIVIL.234WFrancis.2021.10.04.pdf(4)
>n°" I . t / Page: [2] C200 GRADING& EROSION CONTROL PLAN
'rr
7 I a,e 3 Author: m Label CB-1 swale on the civil
1 File Name: 90.PERMIT.CIVIL.234WFrancis.2021.10.04.pdf sheets.
atiEVAwawa imi ta ,4'lass,
< pj
,�,��li ,, PROPOSED CB-1 swale callout has been added.
Ecs.+>mmegoorii CABIN
Fir
MAIN FF:7885.69 Ili
/�, i
of 4„,„. ,1 A '' 1
"1rillil
% •,.v�1 ® I
Age 1 Page: [2] C200 GRADING& EROSION CONTROL PLAN
I ] Since full detention cannot be
a. \ .� w ; , Author: pjm. accommodated in the drywell,
t ,, > „\i File Name: 90.PERMIT.CIVIL.234WFrancis.2021.10.04.pdf
this outlet needs to be controlled
The 100-yr FAA detention volume is to contain the 100 yr FAA
calculated to be 232-cf. The drywell detention volume and release at
--- „. the historic, undeveloped rate
provides 373-cf volume and releases at per the FAA method.
IM_ or below the historic rate. A Hydrocad
.� 1 m analysis of the drywell is included in the Drainage cannot be directed to
a neighboring property unless at
appendices. The 100-yr release is the historic rate. If above the
0.08cfs, which is below the historic rate historic rate, conveyance to the
of 0.23cfs. City's system needs to be shown
via grading/necessary
calculations, etc.
I Page: [4] C301 STORM PLAN &PROFILE Call out rim elevations of all
WE
EN .11.1 A:44+1: 88 '880 Author: pjm
T.eIS� �E File Name: 90.PERMIT.CIVIL.234WFrancis.2021.10.04.pdf inlets to confirm CB-1 is the low
8840 point for overflow discharge and
NV �
787
8 787E The storm structure table on sheet C300 lists to verify design is installed per
Call out rim elevations
__ of all inlets tocpoint plan during the asbuilt reivew.
for overflow
low point rim elevations for all storm structures. CB-1
for overflow discharge T872
nstaledperplaaig"'s rim elevation is confirmed as the lowest.
== during the
mive T&68 Downspout riser rim elevations have been
I
added to sheet C301.
Page: [7] C401 MISCELLANEOUS DETAILS
AE ESSE P Remove the overflow pipe that
--atehillignia7CeTTMAuthor: pjm
File Name: 90.PERMIT.CIVIL.234WFrancis.2021.10.04.pdf originally connected to the storm
° °�®� A main in Francis St.This
�47l ilillnlww`
�� Overflow pipe has been removed. connection is no longer
'�: proposed.
s I Remove the overflow
■ pipe that originally
VT*. u. Sconnected to the
SECTION'SITU RUST El storm main in Francis
RECFANT Ads i St.This connection is
�xATcx vnTx umLE
HANDLE � no longer proposed.
SE__ 4S"MIN PRECAST
'12' 4,GRAVEL e ---PERFORATED PCC RING
R
ORATION
RECEIVED
01/28/2022
ASPEN
BUILDING DEPARTMENT