January 26, 2009
Ms. Mary Apt DePina, E.I.
Stormwater Engineer
City of Fayetteville
433 Hay Street
Fayetteville, NC 28301
Re:
Bonnie Doone Drainage Improvements – Conceptual Drainage Plans
HDR Project No. 89150
Dear Mary:
Please find enclosed the following information:
4 copies of the Conceptual Drainage Plans for the Bonnie Doone East, Central and West areas.
4 copies of the Conceptual Cost Estimates.
4 copies of the updated project goals memorandum.
1 CD with the above in digital format.
Below is brief description of the conceptual plans and cost estimates. The descriptions below are intended
to provide some background and rational for our recommendations and we look forward to discussing them
in more detail at our next meeting.
General
The recommendations were generated based on the information obtained during our neighborhood
walks and the general goals identified in the project goals memorandum.
The existing drainage system was shown in the areas where no improvements are recommended. The
existing drainage system features are screened so the proposed drainage system features stand out.
We did not differentiate between asphalt or concrete paved gutter sections. We will discuss this in
more detail at our next meeting.
Where we show a proposed roadside ditch where an existing ditch is located, we are recommending the
ditch be regraded and new driveway pipes be installed.
Where a storm drainage pipe is recommended for improvement, the existing pipe size is shown below
the estimated new size.
Where a storm drainage pipe is new it is labeled as new below the estimated size.
Storm drainage pipe sizes were estimated based on some rough assumptions of discharge and slope.
The sizes did not account for cover and utility conflicts. These issues will be addressed at the
Preliminary Design Phase.
3733 National Drive
Suite 207
Raleigh, NC 27612-4895
Phone (919) 785-1118
Fax (919) 785-1187
hdrinc.com
Bonnie Doone East (Kornbow Neighborhood)
Outfall 1
o
o
o
Outfall 2
o
o
Outfall 3
o
o
o
The existing roadside ditch on the north side of Stansfield Drive has been piped and filled
in, however, the road drainage does not effectively get into the storm drainage pipe causing
yard flooding. The paved gutter is recommended
The existing paved gutter along Converse Avenue and Converse Court requires some
maintenance but is generally functioning properly. Additional catch basins were
recommended to address spread concerns. Spread will be calculated during the preliminary
design phase.
We were unable to access this outfall.
The paved gutter recommended on the east side only on Stansfield Drive because this will
tie into the existing paved gutter and given the small amount of area, the spread will likely
not require a storm drainage pipe.
Paved gutter was not recommended on the west side because a ditch is required to drain the
yards even if a paved gutter is installed.
Storm drainage piping is required due to the size of the drainage area and limitations of the
proposed ditch section providing the needed capacity.
Roadside ditches are retained to drain the adjacent yards.
Two locations were identified for potential stormwater management facilities.
Outfall 4
o
A paved gutter is recommended along Stansfield Drive to replace the existing asphalt gutter
that is in poor condition.
o There may be a couple low areas generated by the paved gutter that will require additional
drop inlets and storm drainage piping.
o Culverts under Calla Circle and Creed Street are recommended for size upgrades.
o
Table 1 – Bonnie Doone East (Kornbow Section) Conceptual Construction Cost Estimate
Outfall Number
1
2
3
4
Total
3733 National Drive
Suite 207
Raleigh, NC 27612-4895
Conceptual Construction Cost
$56,000
$87,000
$1,060,000
$287,000
$1,490,000
Phone (919) 785-1118
Fax (919) 785-1187
hdrinc.com
Bonnie Doone Central
Outfall 1A (Outfall on Patton Street)
o Asphalt paved gutters recommended to be maintained on Hodge and Patton Streets.
o Inlets recommended at key intersections to limit spread and bypassed flow along gutter line
on these streets.
o A storm drainage system is recommended at the ends of Hodge and Patton Streets to drain
low areas and to tie into existing outfall at Patton Street.
Outfall 1B (Outfall on Grooms Street)
o Asphalt paved gutters recommended to be maintained on Hodge and Patton Streets.
o Storm drainage pipe is required to collect roadway drainage via inlets throughout the
drainage area. Storm pipe to mainly follow Cannon Street with collector systems off
Patton, Higgins, and Grooms Streets.
o Yard inlets provided in key locations where paved gutters will not allow yards to drain.
Outfall 2
o
o
Outfall 3
o
o
o
o
Outfall 4
o
o
o
Paved gutter was mainly recommended because of the close proximity of the residences to
the street. Gutters to be sloped to middle of blocks for Higgins, Collins, and Clyde Streets
to limit number of inlets.
Storm drainage pipe recommended to be aligned down middle of blocks following natural
grades. This alignment will require easements on private property.
Paved gutter was mainly recommended because of the close proximity of the residences to
the street.
Storm drainage pipe is required to collect roadway drainage via inlets throughout the
drainage area. Relocating the outfall from the 109 Grooms Street to the abandoned Gavin
Street right-of-way is recommended to limit flooding to residences.
A potential location was identified for a stormwater management facility.
We were unable to identify the outfall beyond Grooms Street.
A paved gutter is recommended on Stein Street to tie into existing standard curb and gutter
and direct runoff to swale.
The existing storm drainage pipes to Fleishman Street is recommended to be upsized and
rerouted across the street to limit road flooding. Existing ditches are recommended to be
improved to handle capacity.
We were unable to identify the outfall beyond Fleishman Street.
3733 National Drive
Suite 207
Raleigh, NC 27612-4895
Phone (919) 785-1118
Fax (919) 785-1187
hdrinc.com
Table 2 – Bonnie Doone Central Conceptual Construction Cost Estimate
Outfall Number
1
2
3
4
Total
Conceptual Construction Cost
$559,000
$291,000
$1,321,000
$75,000
$2,246,000
Bonnie Doone West
Outfall 1
o
o
Outfall 2
o
Outfall 3
o
Outfall 4
o
o
o
Outfall 5
o
o
o
Paved gutter was mainly recommended because of the close proximity of the residences to
the street.
Storm drainage pipe is required at the high ends of Manos Street and Schmidt Street
because of a lack of positive drainage paths and therefore the system was extended to their
intersections with Mike Street.
Paved gutter was recommended for consistency with the paved gutter needed to drain the
streets to outfall 1.
Recommending this outfall be relocated to outfall 4 location to avoid having to upsize the
existing system running down Wheeling Street.
New location for the outfall.
Storm drainage piping is required due to the size of the drainage area and limitations of the
proposed ditch section providing the needed capacity. The storm pipe system will also
adequately convey runoff from the ends of Squirrel Street and Atwood Drive between the
existing buildings. The system was extended was extended to the headwaters to maintain
consistency.
A potential location was identified for a stormwater management facility.
Culvert added under gravel/sand road to provide drainage. Currently only 1 resident
located off of the gravel/sand road.
Paved gutters added to Squirrel Street and Atwood Drive to maintain consistency with
outfall 4.
Existing ditch system along east side of Haddock Street is adequate to handle drainage.
3733 National Drive
Suite 207
Raleigh, NC 27612-4895
Phone (919) 785-1118
Fax (919) 785-1187
hdrinc.com
Outfall 6
o
No improvements recommended because there is a well defined system between the
commercial areas and the city owned dirt road would need to be completely redone. There
were no problems noted in this area.
Table 3 – Bonnie Doone West Conceptual Construction Cost Estimate
Outfall Number
1
2
4
5
Total
Conceptual Construction Cost
$514,000
$122,000
$575,000
$139,000
$1,350,000
The current total construction cost estimate for all three areas is $5,086,000. Please note that the
recommended improvements were based on our understanding of what the City is looking to achieve.
There are some improvements that were recommended to maintain consistency in the street section and not
necessarily required to provide an adequate drainage system. In addition there are some areas that no
improvements were recommended because there were no problems noted and disturbing the area may
generate more issues than currently exist.
Please let me know if you need additional information prior to our meeting. We look forward to discussing
these recommendations in more detail.
Sincerely,
HDR Engineering Inc. of the Carolinas
Kenneth E. Trefzger, PE, CFM
Senior Project Manager
enclosures
3733 National Drive
Suite 207
Raleigh, NC 27612-4895
Phone (919) 785-1118
Fax (919) 785-1187
hdrinc.com