HomeMy WebLinkAboutFile Documents.1265 Mountain View Dr.0031-2021-BCHO (11)Markup Summary
Page: 5
Author: jackd
Date: 9/1/2021 9:11:10 AM
File Name: 40.Final Drainage Report.20210828.pdf
Provide summary of necessary
detention calculation.
40.Final Drainage Report.20210828.pdf (3)
Page: 5
Author: jackd
Date: 9/1/2021 9:03:51 AM
File Name: 40.Final Drainage Report.20210828.pdf
Provide a maintenance and
management section to show
home owner what is required for
proper upkeep.
Page: 5
Author: jackd
Date: 9/1/2021 9:17:59 AM
File Name: 40.Final Drainage Report.20210828.pdf
Provide summary of how
detention is provided by
Bioretention basins. No void
space in the soil/sand is
counted. Volume must be
counted in gravel or the graded
depression.
Page: 2
Author: jackd
Date: 9/1/2021 9:01:21 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Provide actual cross section
view of all of these bioretention
basins.
90.CIVIL DRAWING SET.20210828.pdf (9)
Page: 2
Author: jackd
Date: 9/1/2021 8:59:04 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Contours do not match the
proposed slopes. Show
proposed contours on Grading
plan.
Lot 7, West Meadows July 2021
On-Site Drainage
Runoff from the developed area was designed to be released at a rate consistent with historic flows. Runoff from the developed areas, which includes the xeriscape gravel areas, driveway, and parking area, are conveyed via a series of drainage swales and downspout
piping to onsite landscaped areas for bio retention of total affected impervious area of 3,360 square feet for the 100-year storm event.
A summary of the drainage basin and peak runoff for the 5-year and 100-year design storms
are summarized in the appendix of this report
3.0 Low Impact Site Design
The use of planting and Bio-Retention areas is the proposed method for stormwater treatment located near the areas of disturbance. A detail of the Bio-Retention cross section and material is on sheet PRDR1
4.0 Hydrologic Criteria
All hydraulic criteria are derived from the Aspen URMP and URDFCD calculation sheets. These output data sheets are shown in the appendix of this report.
Provide summary of
necessary detention
calculation.
Drainage Report
The only proposed facilities proposed with this pro
section of this report and will all be contained ons
easements.
7.0 Conclusions
As previously stated, the intent of any proposed improvem
is to maintain the drainage runoff conditions as are current storage to offset the proposed improvements. The grass
this goal with still keeping the as-is natural feel of the sub
Provide a
maintenance and
management section
to show home owner
what is required for
proper upkeep.
Lot 7, West Meadows July 2021
On-Site Drainage
Runoff from the developed area was designed to be released at a rate consistent with historic flows. Runoff from the developed areas, which includes the xeriscape gravel areas, driveway, and parking area, are conveyed via a series of drainage swales and downspout piping to onsite landscaped areas for bio retention of total affected impervious area of 3,360 square feet for the 100-year storm event.
A summary of the drainage basin and peak runoff for the 5-year and 100-year design storms are summarized in the appendix of this report
3.0 Low Impact Site Design
The use of planting and Bio-Retention areas is the proposed method for stormwater
treatment located near the areas of disturbance. A detail of the Bio-Retention cross section and material is on sheet PRDR1
4.0 Hydrologic Criteria
Provide summary of how detention is
provided by Bioretention basins. No void
space in the soil/sand is counted. Volume
must be counted in gravel or the graded
depression.
Provide actual cross
section view of all of
these bioretention
basins.
Contours do not
match the proposed
slopes. Show
proposed contours
on Grading plan.
The detention volume was calculated by finding the runoff volume of the disturbed area
using the rational method and determining volume was modeled with a FAA spreadsheet
for storage volume.
Detention Requirements are being provided by installing bio-retention
areas with sufficient square footage for water treatment and adding the
necessary cubic feet volume for water storage above the bio material.
Proposed depths vary by area and are outlined on the plan C1 to which
basin above the water treatment soil media is respectively.
To different basin styles are proposed; Type A & B.
corresponding cross sections have been added to C1
Additional spot elevations and topography contours have been added.
Maintenance Plan section has been added
09/29/2021
Page: 2
Author: jackd
Date: 9/1/2021 9:27:08 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Water shut off valve to be
located on property line.
Page: 2
Author: jackd
Date: 9/1/2021 9:28:44 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Snowmelt on a separate zone in
the ROW and a permanent
encroachment.
Page: 2
Author: jackd
Date: 9/1/2021 9:30:20 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Show proposed drainage pan.
No snowmelt can drain to the
road.
Page: 2
Author: jackd
Date: 9/1/2021 9:06:21 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Show how back yard impervious
areas are treated and retained.
Page: 2
Author: jackd
Date: 9/1/2021 9:27:42 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Verify alignment of installed
water line.
Water shut off valve
to be located on
property line.
Snowmelt on a
separate zone in the
ROW and a
permanent
encroachment.
Show proposed
drainage pan. No
snowmelt can drain
to the road.
Show how back yard
impervious areas are
treated and retained.
Verify alignment of
installed water line.
WSO has been relocated to property line
Additional Hatching been added to identify the
specifica area and a note to plans for reference
additional flow arrow and spot elevations have been added.
the proposed pan has been separated by hatching and
a cross section has been added to plan C1
AN ADDITIONAL BIORETENTION AREA IS SHOWN OFF THE SOUTH EAST CORNER OF
THE HOUSE, PLUS ADDTIONAL SPOT ELEVATIONS, GRADE NOTES HAVE BEEN
ADDED.
Based on conversations with the contractor and swing dimensions from existing
lot features we believe this alignment is correct within utility locate tolerances
09/29/2021
Page: 2
Author: jackd
Date: 9/1/2021 9:06:26 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Show how impervious area on
the East side of the house is
treated and retained.
Page: 2
Author: jackd
Date: 9/1/2021 9:19:08 AM
File Name: 90.CIVIL DRAWING SET.20210828.pdf
Seemingly no detention is
provided by this bioretention
basin.
Show how
impervious area on
the East side of the
house is treated and
retained.
Seemingly nodetention is providedby this bioretentionbasin.
This area is graded and landscaped
to flow north to the bio retention
area along the driveway.
Detention Requirements are being provided by
installing bio-retention areas with sufficient square
footage for water treatment and adding the necessary
cubic feet volume for water storage above the bio
material. Proposed depths vary by area and are
outlined on the plan C1 to which basin above the
water treatment soil media is respectively.
09/29/2021