HomeMy WebLinkAboutSDP200800174 Calculations 2009-03-17PARKING ANALYSIS
BLOCKS 1 AND 2
OLD TRAIL VILLAGE
March 17, 2009
COLLINS
Old Trail Vilfnge Blocks 1 & 2 Parking Analysis
Summary of proposed development
Block 1, located along the west side of Old Trail Drive, between the two roundabouts, is
considered the heart of the Village Center at Old Trail. This block will consist of two mixed use
buildings with commercial space on the ground floor and apartments on the second floor. While
a range of uses are allowed by the code of development for Old Trail Village, some assumptions
can be made based on anticipated market conditions and existing leased space. The following is
a breakdown of the anticipated uses for each of the buildings within block 1:
Block 1 Uses
Building 1:
residential units
restaurant/ retail space
office space
athletic facility/ health club
Building 2:
residential units
restaurant/ retail space
office space
Block 2 will be occupied by a retirement facility serving some residents in a congregate care
environment, while other areas will be devoted to a rest home/ nursing home/ convalescent. A 3-
story commercial building is proposed at the southwest corner of the block. The following
summarizes the uses in Block 2:
Block 2 Uses
78 residential units devoted to a multi- family congregate care facility for the
elderly
40 beds devoted to rest home/ nursing home/ convalescent home
40 employees maximum, during a given shift to serve residents of both
components of the facility
10,500 sq. ft. of leasable commercial office space
Parking Required
The varying users within both blocks are conducive to shared parking arrangements.
Block 2 — Senior facility
Because the mix of uses within the retirement facility in Block 2 is the least complex to analyze,
this will be considered first. The block 2 retirement facility consists of two basic uses: (1)Multi-
family congregate care for the elderly and (2)Rest home/ nursing home/ convalescent home. The
parking required for each of these two uses is summarized as follows.
1.Multi- family congregate care for the elderly
Page 2 of 6
Old Trail V riage Blocks I & 2 Parking Analysis
Section 18- 4.12.6 of the Albemarle County Zoning Ordinance provides the following parking
requirement for multi- family congregate care for the elderly:
Multi family dwellings for the elderly: One and one - quarter (1 1/4) spaces per unit plus one
1) space per employee on the largest shift; provided that for a congregate care facility, one
1) space per unit plus one (1) space per employee on the largest shift.
The congregate care portion of the facility generates the following parking demand:
78 congregate care units x (1 space/ unit) = 78 parking spaces required for residents
40 employees on largest shift* x (1 space/ employee) = 40 parking spaces for employees*
note that employees will serve both congregate care and assisted living residents
2.Rest home, nursing home, convalescent home
Section 18- 4.12.6 of the Albemarle County Zoning Ordinance provides the following parking
requirement for rest home, nursing home, convalescent home:
Rest home, nursing home, convalescent home: One (1) space per four (4) beds.
The convalescent home portion of the facility generates the following parking demand:
40 beds (1 space/ 4 beds) = 10 spaces required
In summary, Block 2 generates the following gross parking demand:
Use Parking Demand
Congregate Care Units 78
Convalescent Home beds 10
Employees 40
TOTAL 128
It is reasonable to allow up to 20% shared parking between residential and commercial users.
For Block 2, congregate care parking demands are generated by residents, while the parking
needs generated by the convalescent home and employees are considered commercial uses.
Allowing up to 20% shared parking between these uses would allow for a parking reduction to
107 spaces required. Shared parking is calculated as follows:
128 — 107 x 100% = 19.6% shared (under 20 %)
107
Block 1 & Block 2 corner building
Block 1 consists of residential apartments and commercial space of varying uses. The corner
office building in Block 2 will provide up to 10,500 sq. ft. of commercial office space. With at
least 4 distinct uses under consideration, analyzing shared parking becomes more complex. To
more accurately model the parking scenario anticipated for this block, we have employed the
Urban Land Institute's (ULI) shared parking analysis methodology. This analysis establishes
base parking ratios for each use, separated between weekdays and weekends. The base parking
ratios are then adjusted based on employees /residents versus customers /visitors, months of the
year and time of day. Recommended ratios and adjustment factors are provided by ULI based on
extensive market research for individual uses.
Page 3 of 6
Old Trail ['image Blocks I R 2 Parking Analysis
Base parking ratios were calculated based on the ratios provided by ULI. Base parking ratios for
commercial square footage are calculated based on gross leasable area, which is summarized
below:
Block 1 & Block 2 Corner Office Building Uses
Building 1 Building 2 Block 2 Office Total
Residential Units 39 units 39 units 0 78 units
Restaurant/ Retail 8645 sf GLA 12,253 sf GLA 0 20,898 sf GLA
Office 8645 sf GLA 12,253 sf GLA 10,500 GLA 31,398 sf GLA
Athletic Facility 7216 sf GLA 0 0 7216 sf GLA
The base parking ratios were calculated for weekdays and weekends, and separated between
visitors/ customers and employees/ residents. See Table 1.
Tables 2 and 3 list the monthly adjustment factors per ULI. These factors were applied to the
base parking ratios, resulting in the adjusted parking values provided in tables 4 and 5. This
analysis shows the peak weekday parking demand to occur in October (491.5 spaces), and the
peak weekend parking demand to occur in December (477.6 spaces).
Time of day factors provided by ULI are shown in Tables 6 and 8. These factors were applied to
the peak parking values generated for weekdays in October and weekends in December, resulting
in Tables 7 and 9. The peak hour of weekday parking demand occurs at 11:00 am on weekdays
in October (424 spaces). The peak hour of weekend parking demand occurs at 12:00 noon on
weekends in December (417 spaces). Similar matrices were produced for the summer months
June through August), resulting in a maximum parking demand of 418 spaces.
Parking provided
As currently designed, 441 parking spaces are proposed between blocks 1 and 2. These are
broken down as follows:
Parking provided: Blocks 1 and 2
Block #Surface Spaces Garage Spaces On- street Total Spaces
Spaces
1 194 12 206
2 121 78 36 235
Total spaces 315 78 48 441
provided for
Blocks 1 and 2
The block 2 retirement facility requires 107 parking spaces, as calculated above. The remaining
334 spaces are available for the users of Block 1 and the corner office building in Block 2.
Based on the analysis conducted, this appears to be adequate for the parking needs calculated,
with the exception of the periods from Sam to 2pm on weekdays and from 9am to 1pm and 5pm
to 8pm on weekends. The maximum additional parking needed would be 90 spaces.
Page 4 of 6
Old Trail image Blocks 1 & 2 Parking Analysis
Other Parking Considerations
In addition to the lots and on- street parking provided for blocks 1 and 2, several additional
parking considerations should be taken into account.
Variable Modes of Transportation
Old Trail Village is designed to be pedestrian - friendly with sidewalks and street trees lining
every street. Trails and sidewalks will link neighborhoods, traffic calming measures, such as
roundabouts, have been employed to control traffic speeds, and streetscapes are oriented to the
pedestrian. While Old Trail Village is still in its infancy, a high degree of pedestrian mobility is
expected. Block 1 will be the commercial center of the development and is planned to be an
attractive pedestrian destination for thousands of surrounding residents. It is reasonable to
expect that many patrons of the businesses within block 1 will choose to walk, rather than drive,
to their destination, especially during daylight hours, when peak parking needs are the highest.
Available Parking in Pool Lot
Block 3, just to the north of Block 1, will be home of an outdoor community pool and swim club.
A parking lot and on- street parking consisting of 109 spaces has been approved for pool users.
The pool lot entrance is located less than 400 ft. from Block 1. The pool use generates a need for
only 68 parking spaces, and will only be used during the summer months (i.e. Memorial Day to
Labor Day). The remainder of the year, these spaces will be available for Block 1 parking needs.
The following summarizes the excess parking available in the pool lot:
Jan. -May & Sept. -Dec.109 spaces available
June -Aug.109 — 68 = 41 spaces available
Future Development
Other surrounding blocks will be developed with a mixture of uses and parking lots to
accommodate them. Parking will be available in these lots to further supplement Block 1. In
particular, the remainder of Block 3 is intended to include a parking lot to accommodate
additional development.
Analysis
Parking is provided throughout the Village Center in surface lots, on- street and in garages which
will be shared among users. Because the availability of the pool lot varies, based on the time of
year, the parking situation has been analyzed in two scenarios: (1) during the months of June -
August, when the pool will be open and in need of parking; and (2) during the remainder of the
year (September — May) when the pool will be closed and its parking lot will be available. The
following table summarizes the parking conditions in each of these two scenarios:
Page 5 of 6
Old Trail Village Blocks 1 & 2 Parking Analysis
Parking Summary — Blocks 1, 2 and 3
Block #June — August September - May
Available Max.Net Parking Available Max.Net Parking
Parking Parking Parking Parking
spaces Demand spaces Demand
1 (bldgs 1 206 424 218 206 424 218
2) +
Block 2
corner
office bldg
2 235 107 128 235 107 128
retirement
facility)
3 (pool)109 68 41 109 0 109
TOTAL 550 599 49 550 531 19
During the majority of the year (September through May) adequate parking is available to
accommodate the maximum demand within Blocks 1 and 2. A surplus of at least 19 spaces is
anticipated.
During the summer months, when the pool will be in use, there may be a shortage of parking
spaces for Blocks 1 and 2. At the peak hour of demand, an additional 49 spaces may be needed.
This accounts for less than 9% of the total number of parking spaces in demand during the
summer months. These additional parking spaces will be accommodated via additional on- street
parking spaces which are not yet accounted for and in future parking to be provided within the
undeveloped portion of Block 3. Additionally, it is reasonable to assume that during the summer
months, pedestrian trips may replace a small percentage of vehicle trips, especially as additional
residential development occurs in the surrounding blocks at Old Trail Village. The attached
exhibit graphically depicts the parking availability described in this analysis.
In conclusion, parking demands vary for Blocks 1, 2 and 3 depending on the time of year, day of
the week and time of day. While the site plans currently approved or under review include
adequate parking spaces to handle the majority of peak parking demands, during the highest
parking demand in the summer months, up to 20 additional spaces may be needed. These will be
accommodated in the future development of Block 3, and with on- street parking that is currently
unaccounted for in the calculations. Furthermore, it is anticipated that as the Village Center
becomes more developed and residential development increases, pedestrian travel will become
more common to and from the Village Center, further reducing the demand for parking.
Page 6 of 6
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PARKING ANALYSIS
BLOCKS ] AND 2
OLD TRAIL VILLAGE
February 10, 2009
COLLINS
roil 171/11 1 11111C 1 I C 2 1'arlunt, 1nalisrs
Summary of proposed development
Block 1, located along the west side of Old Trail Drive, between the two roundabouts, is
considered the heart of the Village Center at Old Trail. This block will consist of two mixed use
buildings with commercial space on the ground floor and apartments on the second floor. While
a range of uses are allowed by the code of development for Old Trail Village, some assumptions
can be made based On anticipated market conditions and existing leased space, The following is
a breakdown of the anticipated uses for each of the buildings within block 1:
Block 1 Uses
Building 1:
residential units
restaurant/ retail space
office space
athletic facility / health club
Building 2:
residential units
restaurant/ retail space
office space
Block 2 will be occupied by a retirement facility serving some residents in a congregate care
environment, while other areas will be devoted to a rest home/ nursing home/ convalescent. The
following summarizes the uses in Block 2:
Block 2 Uses
78 residential units devoted to a multi- family congregate care facility for the
elderly
40 beds devoted to rest home/ nursing home/ convalescent home
40 employees maximum, during a given shift to serve residents of both
components of the facility
Parking, Required
The varying users within both blocks is conducive to shared parking arrangements between
users.
Block 2
Because the mix of uses in Block 2 is the least complex to analyze, this will he considered first.
Block 2 consists of two basic uses: (1)Multi- family congregate care for the elderly and (2)Rest
home/ nursing home/ convalescent home. The parking required for each of these two uses is
summarized as follows.
1.Multi- family congregate care for the elderly
Section 18- 4.12.6 of the Albemarle County Zoning Ordinance provides the following parking
requirement for multi family congregate care for the elderly:
Page 2 of 6
Oh/ . 1 ruil I'rllct/!c Blocks / 4 = l'(1rhin,, .1nulrsr./
llrrllr /umi/r chrrllurgs /w the elderly: One and one - quarter 11 1/4) spaces per unit plus one
1) space per employee on the largest shift; provided that (Cr a congregate care facility one
1) space per unit plus one (1) space per employee on the largest shift.
The congregate care portion of the facility generates the following parking demand:
78 congregate care units x (1 space / unit) = 78 parking spaces required for residents
40 employees on largest shift* x (1 space/ employee) = 40 parking spaces for employees*
note that C1)1J71ol)CCS' will sC /'l'e 1)ot11 congregate Care and assisted living residents
2.Rest home, nursing home, convalescent home
Section 1 8- 4.12.6 of the Albemarle County Zoning Ordinance provides the following parking
requirement for rest home, nursing home, convalescent home:
Rest home, nursing home, convalescent home: One (1) space per Tour (4) beds.
The convalescent home portion of the facility generates the following parking demand:
40 beds (1 space/ 4 beds) = 10 spaces required
In summary, Block 2 generates the following gross parking demand:
Use Parking Demand
Congregate Care Units 78
Convalescent Horne beds 10
Employees 40
TOTAL 128
It is reasonable to allow up to 20% shared parking between residential and commercial users.
For Block 2, congregate care parking demands are generated by residents, while the parking
needs generated by the convalescent home and employees are considered commercial uses.
Allowing up to 20% shared parking between these uses would allow for a parking reduction to
107 spaces required. Shared parking is calculated as follows:
128 — l 07 x 100% = 19.6% shared (under 20 %)
107
Block 1
Block 1 consists of residential apartments and commercial space of varying uses. With at least 4
distinct uses under consideration, analyzing shared parking becomes more complex. To more
accurately model the parking scenario anticipated for this block, we have employed the Urban
Land Institute's (ULI) shared parking analysis methodology. This analysis establishes base
parking ratios for each use, separated between weekdays and weekends. The base parking ratios
are then adjusted based on employees /residents versus customers /visitors, months of the year and
time of day. Recommended ratios and adjustment factors are provided by ULI based on
extensive market research for individual uses.
Base parking ratios were calculated based on the ratios provided by ULI. Base parking ratios for
commercial square footage are calculated based on gross leasable area, which is summarized
below:
Page 3 of 6
1 (1 1 rail 1 7 /(ris;r /i /nrk:. I cl' 2 Rarkirt;' .-inultsis
Block 1 Uses
Building 1 Building 2 Total
Residential Units 39 units 3 units 78 units
Restaurant/ Retail 8645 sf GLA 12,253 sf GLA 20,898 sf GLA
Office 8645 sf GLA 12,253 sf GLA 20,898 sf GLA
Athletic Facility 7216 sfGLA 0 7216 sVGL.A
The base parking ratios were calculated for weekdays and weekends, and separated between
visitors/ customers and employees / residents. See Table 1.
Tables 2 and 3 list the monthly adjustment factors per UL1. These factors were applied to the
base parking ratios. resulting in the adjusted parking values provided in tables 4 and 5. This
analysis shows the peak weekday parking demand to occur in October (451.6 spaces), and the
peak weekend parking demand to occur in December (474.4 spaces).
Time of day factors provided by ULI are shown in Tables 6 and 8. These factors were applied to
the peak parking values generated for weekdays in October and weekends in December, resulting
in Tables 7 and 9. The peak hour of weekday parking demand occurs at 1 1:00 am on weekdays
in October (386 spaces). The peak hour of weekend parking demand occurs at 12:00 noon on
weekends in December (414 spaces). Similar matrices were produced for the summer months
June through August), resulting in a maximum parking demand of 408 spaces.
Parking provided
As currently designed, 454 parking spaces are proposed between blocks 1 and 2. These are
broken down as follows:
Parking provided: Blocks 1 and 2
Block #Surface Spaces Garage Spaces On- street Total Spaces
Spaces
1 194 12 206
2 134 78 36 248
Total spaces 328 78 48 454
pronidedfor
Blocks 1 and 2
Block 2 requires 107 parking spaces, as calculated above. The remaining 347 spaces are
available for the users of Block 1. Based on the analysis conducted, this appears to be adequate
for the parking needs calculated, with the exception of the periods from gam to 1 pni on
weekdays and from 1 Oam to 1 pm and 6pm l0 7pn1 on weekends. The maximum additional
parking needed would be 67 spaces.
Page 4 of 6
c! h ii! I rlh:ar Block.% ! cE: 2 Parking ,-Inalysi:.
Other Parking Considerations
In addition to the lots and on- street parking provided for blocks 1 and 2, several additional
parking considerations should be taken into account.
Variable Modes of Transportation
Old Trail Village is designed to be pedestrian- friendly with sidewalks and street trees lining
every street. Trails and sidewalks will link neighborhoods, traffic calming measures, such as
roundabouts, have been employed to control traffic speeds, and streetscapes are oriented to the
pedestrian. While Old Trail Village is still in its infancy, a high degree of pedestrian mobility is
expected. Block 1 will he the commercial center of the development and is planned to be an
attractive pedestrian destination for thousands of surrounding residents. It is reasonable to
expect that many patrons of the businesses within block 1 will choose to walk, rather than drive,
to their destination, especially during daylight hours, when peak parking needs are the highest.
Available Parking in Pool Lot
Block 3, just to the north of Block 1, will he home of an outdoor community pool and swim club.
A parking lot and on- street parking consisting of 109 spaces has been approved for pool users.
The pool lot entrance is located less than 400 ft. from Block 1. The pool use generates a need for
only 68 parking spaces, and will only be used during the summer months (i.e. Memorial Day to
Labor Day). The remainder of the year, these spaces will be available for Block 1 parking needs.
The following summarizes the excess parking available in the pool lot:
Jan. -May & Sept. -Dec.109 spaces available
June -Aug.109 — 68 = 41 spaces available
Future Development
Other surrounding blocks will be developed with a mixture of uses and parking lots to
accommodate them. Parking will be available in these lots to further supplement Block 1. In
particular, the remainder of Block 3 is intended to include a parking lot to accommodate
additional development.
Analysis
Parking is provided throughout the Village Center in surface lots, on- street and in garages which
will be shared among users. Because the availability of the pool lot varies, based on the time of
year, the parking situation has been analyzed in two scenarios: (1) during the months of June -
August, when the pool will be open and in need of parking; and (2) during the remainder of the
year (September— May) when the pool will be closed and its parking lot will be available. The
following table summarizes the parking conditions in each of these two scenarios:
Page 5 qJ 6
Old '/r ri! I 'i// t Blocks / cl' 2 l'nrAir, . l uirh sr.ti
Parking Summary — Blocks 1, 2 and 3
Block 4 June -- August September - May
Available Max.Net Parking Available Max.Net Parking
Parking Parking Parking Parking
spaces Demand spaces Demand
206 408 202 206 414 208
2 248 107 141 248 107 141
3 (pool)109 68 41 109 0 109
TOTAL 563 583 20 563 521 42
During the majority of the year (September through May) adequate parking is available to
accommodate the maximum demand within Blocks 1 and 2. A surplus of at least 42 spaces is
anticipated.
During the summer months, when the pool will be in use, there may be a shortage of parking
spaces for Blocks 1 and 2. At the peak hour of demand, an additional 20 spaces may be needed.
This accounts for less than 4% of the total number of parking spaces in demand during the
summer months. These additional parking spaces will he accommodated via additional on- street
parking spaces which are not yet accounted for and in future parking to be provided within the
undeveloped portion of Block 3. Additionally, it is reasonable to assume that during the summer
months, pedestrian trips may replace a small percentage of vehicle trips, especially as additional
residential development occurs in the surrounding blocks at Old Trail Village. The attached
exhibit graphically depicts the parking availability described in this analysis.
In conclusion, parking demands vary for Blocks 1, 2 and 3 depending on the time of year, day of
the week and time of day. While the site plans currently approved or under review include
adequate parking spaces to handle the majority of peak parking demands, during the highest
parking demand in the summer months, up to 20 additional spaces may be needed. These will be
accommodated in the future development of Block.: 3, and with on- street parking that is currently
unaccounted for in the calculations. Furthermore, it is anticipated that as the Village Center
becomes more developed and residential development increases, pedestrian travel will become
more common to and from the Village Center, further reducing the demand for parking.
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Modified Simple Method Worksheets
Divide the Site into Drainage Areas — Worksheet 1
Calculate the area in acres for each drainage area, and label each drainage area on the plan. It
will be necessary to fill out the following series of worksheets for each drainage area.
Drainage Area 1: /0-5 acres (on- site); acres (off - site); -4o -5 total acres
Drainage Area 2:acres (on- site);acres (off - site);total acres
Drainage Area 3:acres (on- site);acres (off - site);total acres
Drainage Area 4:acres (on- site);acres (off-site);total acres
Drainage Area 5:acres (on- site);acres (off - site);total acres
Drainage Area 6:acres (on- site);acres (off-site);total acres
Drainage Area 7:acres (on- site);acres (off-site);total acres
Total (On -site) Area =acres
05 February 2003
WR -8
Calculate Pre - Development Impervious Cover (I pre) - Worksheet 2
Calculate I(pre) using actual site information for each drainage area (on -site acres only) as
identified in Worksheet 1. If the project is phased, include only the active phase(s).
DRAINAGE AREA # 1
ON -SITE AREA = 0.5" ACRES (on -site drainage area size)
Roads: length (ft) x width (ft) for all roads square feet
Driveways: average length (ft) x average width (ft) x number of driveways =square feet
Parking Lots: square footage square feet
Gravel Areas: square footage x 0.70 square feet
Structures (including houses):
sum of actual square footage for all structures, OR
average house square footage x number of houses square feet
Actively - grazed pasture (livestock present), Yards & areas of cultivated turf:
actual square footage of areas x 0.08, OR
average yard area x number of yards x 0.08 .square feet
Active crop land: square footage x 0.25 square feet
Other Impervious Areas square feet
Total Equivalent Impervious Area =square feet sum of all the above values)
I(pre) Total Equivalent Impervious Cover (sq ft) x 100
43560 sq ft per acre /on -site drainage area (acs.)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
Roads: length (ft) x width (ft) for all roads square feet
Driveways: average length (ft) x average width (ft) x number of driveways =square feet
Parking Lots: square footage square feet
Gravel Areas: square footage x 0.70 square feet
Structures (including houses):
sum of actual square footage for all structures, OR
average house square footage x number of houses square feet
Actively- grazed pasture (livestock present), Yards & areas of cultivated turf
actual square footage of areas x 0.08, OR
average yard area x number of yards x 0.08 .square feet
Active crop land: square footage x 0.25 square feet
Other Impervious Areas square feet
Total Equivalent Impervious Area =square feet sum of all the above values)
I(pre) Total Equivalent Impervious Cover (sq ft) x 100
43560 sq ft per acre /on -site drainage area (acs.)
05 February 2003
WR-8
Calculate Pre - Development Phosphorus Load (Lyre) — Worksheet 3
Use the following table to calculate L(pre) based on the water resources area in which the project
is located.
Water Resources Area L(pre) _
Development Area, where I(pre) is less than 1.41 x A
or equal to 20%
Development Area, where I(pre) is greater 6.14 x [0.05 + (0.009)(Ipre)] x A
than 20%
Water Supply Protection Area, no existing 0.15 x A
impervious cover (do not count existing
equivalent impervious cover from pasture or
crop land)
Water Supply Protection Area, site with 3.07 x [0.05 + (0.009)(Ipre)] x A
existing impervious cover
Other Rural Land, no existing impervious 0.21 x A
cover (do not count existing equivalent
impervious cover from pasture or crop land)
Other Rural Land, site with existing 3.51 x [0.05 + (0.009)(Ipre)] x A
impervious cover
L(pre) = Pre - Development Phosphorus Load (pounds/year)
I (pre) = Pre - Development Equivalent Impervious Cover
expressed in whole numbers from Worksheet 2)
A On -Site Drainage Area (acres)
DRAINAGE AREA # 1
ON -SITE AREA = 10.5' ACRES (on -site drainage area size)
L (pre) = Li431 pounds per year (annual loading)
05 February 2003
WR -8
Nee
Worksheet 3 — Continued)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (pre) =pounds per year (annual loading)
05 February 2003
WR -8
Calculate Post - Development Ultimate Impervious Cover (I post) - Worksheet 4
Use the following worksheet to calculate I(post) using assumed figures for build -out of the
project, including roads, houses, driveways, yards, etc.
DRAINAGE AREA # L
ON -SITE AREA = o.. 5" ACRES (on -site drainage area size)
Roads: length (ft) x width (ft) for all roads 742 feet
Driveways: average length (ft) x average width (ft) x number of driveways =square feet
Parking Lots: square footage square feet
Gravel Areas: square footage x 0.70 square feet
Structures (including houses):
sum of actual square footage for all structures, OR
average house square footage x number of houses S/, 600square feet
Actively - grazed pasture (livestock present), Yards & areas of cultivated turf:
actual square footage of areas x 0.08, OR
average yard area x number of yards x 0.08 .square feet
Active crop land: square footage x 0.25 square feet
Other Impervious Areas 2 , 5' J square feet
Total Equivalent Impervious Area = /79, 'so square feet sum of all the above values)
I(post) Total Equivalent Impervious Cover (sq ft) x 100
43560 sq ft per acre /on -site drainage area (acs.)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
Roads: length (ft) x width (ft) for all roads square feet
Driveways: average length (11) x average width (ft) x number of driveways =square feet
Parking Lots: square footage square feet
Gravel Areas: square footage x 0.70 square feet
Structures (including houses):
sum of actual square footage for all structures, OR
average house square footage x number of houses square feet
Actively - grazed pasture (livestock present), Yards & areas of cultivated turf:
actual square footage of areas x 0.08, OR
average yard area x number of yards x 0.08 .square feet
Active crop land: square footage x 0.25 square feet
Other Impervious Areas square feet
Total Equivalent Impervious Area =square feet sum of all the above values)
I(post) Total Equivalent Impervious Cover (sq ft) x 100
43560 sq ft per acre /on -site drainage area (acs.)
05 February 2003
WR -8
Calculate Post - Development Phosphorus Load (L post) — Worksheet 5
Use the following table to calculate L(post) based on the water resources area in which the
project is located.
Water Resources Area L(post)
Development Area 6.14 x [0.05 + (0.009)(Ipost)] x A
Water Supply Protection Area 3.07 x [0.05 + (0.009)(Ipost)] x A
Other Rural Land 3.51 x [0.05 + (0.009)(Ipost)] x A
L(post) = Post - Development Phosphorus Load (pounds/year)
I (post) = Post- Development Equivalent Impervious Cover
expressed in whole numbers from Worksheet 4)
A On -Site Drainage Area (acres)
DRAINAGE AREA #
ON -SITE AREA = l9. S' ACRES (on -site drainage area size)
L (post) = 26 -43 pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (post) =pounds per year (annual loading)
DRAINAGE AREA #
ON -SITE AREA =ACRES (on -site drainage area size)
L (post) =pounds per year (annual loading)
05 February 2003
WR -8
Calculate Pollutant Removal Requirement — Worksheet 6
RR Pollutant) Removal Requirement = L post — ( L pre x f)pounds per year)
Where "f' is a factor applied to the Removal Requirement based upon the Conditions
described below.
RR = Overall BMP Pollutant Removal Efficiency = (RR x 100 ) / L post percent)
Condition 1— "No Existing Impervious Cover" ; f= 1.0
This condition does not include equivalent impervious cover from pasture/crop Iand. It
includes "new development" in all water resources areas and "adding impervious cover to
existing sites" when existing impervious cover is within:
Development Area and is less than or equal to 20%
Water Supply Protection Area and is 0%
Other Rural Land and is less than or equal to 1%
Condition 2 — "Adding Impervious Cover To Sites With Existing Impervious Cover" in the
Development Areas ; f= 0.90
This condition includes "adding impervious cover to existing sites" when existing
impervious cover is greater than 20% or is designated as " infill and redevelopment ".
Condition 3 — "Adding Impervious Cover To Sites With Existing Impervious Cover" in the
Water Supply Protection Area or Other Rural Land ; f= 0.85
This condition includes "adding impervious cover to existing sites" when existing
impervious cover is within:
Water Supply Protection Area and is greater than 0%
Other Rural Land and is greater than 1%
Designated as "infill and redevelopment"
DRAINAGE AREA # j-Condition: CW 1 2 3
L post = 26.L pre = /RR = /I-CZ RR = Litt
05 February 2003
WR-8
Nor
NO/
1
Worksheet 6 — Continued)
DRAINAGE AREA #Condition: 0 1 0 2 0 3
Lpost=L pre =RR=RR=
DRAINAGE AREA #Condition: 1 2 0 3
L post =L pre =RR =RR =
DRAINAGE AREA #Condition: 1 0 2 0 3
Lpost=Lpre=RR=RR=
DRAINAGE AREA #Condition: 1 2 0 3
L post =L pre =RR =RR =
DRAINAGE AREA #Condition: 1 0 2 3
L post =L pre =RR =RR =
DRAINAGE AREA #Condition: 1 2 3
Lpost=Lpre =RR=RR=
d'DRAINAGE AREA #Condition: 1 0 2 0 3
L post =L pre =RR =RR =
w
4774
05 February 2003
WR -8
tom