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HomeMy WebLinkAboutWPO201700004 Calculations WPO VSMP 2017-03-17 PROJECT MANAGEMENT impCIVIL ENGINEERING LAND PLANNING ENGINEERING:: March 17, 2017 County of Albemarle Department of Community Development 401 McIntire Road Charlottesville, VA 22902 .. Regarding: Commonwealth Apartments Stormwater Management Plan Dear Reviewer, The purpose of construction is to build a 22-unit apartment building on a vacant plot of land. NO Water quality standards set forth by 9VAC-25-870-65 will be addressed through the purchase of nutrient credits. The Virginia Runoff Reduction Method spreadsheet was used to determine that this site is in need of 1.14 lbs phosphorus removal. 0.80 lbs of nutrient credits were purchased for a previously approved plan "' that was not built; therefore 0.34 lbs will be purchased with this plan. This site is not subject to energy balance analysis, as it is less than 1%of the total watershed area, as per 9VAC25-870-66 subsection B(4). All stormwater calculations have been included in this report. 4. .r. w wr r■ Contents: - Land Use: Pre-Development Land Use Map Post-Development Land Use Map MN Stormwater Quality Calculations: VRRM New Development Spreadsheet Culvert Sizing Calculations: Culvert Sizing Drainage Map LD-229 Storm Drain Calculations LD-204 Stormwater Inlet Computations Independent Reports: •. Excerpt from NRCS Soils Report NOAA Precipitation Report MIN MIN MO Land Use . Pre-Development Land Use Map Post-Development Land Use Map am ma am ea Nr NM r. C N m O D0(-lN � of o N ,)F-O Qi D 0 m I cNa- , 1 73 I O..N N 7 N 3 C w 3 N 10001.:(10 ♦0 }0 }° } } } * * �. * " � } '0 °0*0 °0 000 } IC.}410:" * * " 0000\-(0000800W000V-r0000/-rrt0.0.1d0.6, 4/7,0. * 00 g0000g009,00000 00%90000%g0000 9,00009<%00g0°�Q. * S9'�yW� W � }WW0*%*0WW . 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W O DOD 0 TJ I -017 10701.1 7)0 0 tD CD a 0WcA 3N -CA,.•.- 0 -' 3 n ca N CD o w m II ♦ 1 1,4S GAN) U CD .,&0° f v('--N I 0. co ♦0 w t ♦ F. ip*: -jj\--- . cr) ©. +o o D o CD �1 -. o0 71 0 z C rT, Z CD o c o - O C •O C O O a' C' 61o cn o o CD n U L' (J)) o � o m -+ n U o C CD O CD cD TI co �� T r-f- w Stormwater Quality Calculations VRRM New Development Spreadsheet NW OW Y. r Project Name: Commonwealth Apartments e, i- data input cells EICR ALL` Date: 11-Jan-17 constant values BMP Design Specifications List:2013 Draft Stds&Specs calculation cells Site Information final results Post-Development Project(Treatment Volume and Loads) 'Land Cover (acres) A Soils B Soils C Soils D Soils Forest/Open Space(acres)-undisturbed, protected forest/open space or reforested land 0.00 Managed Turf(acres)-disturbed,graded for /yards or other turf to be mowed/managed 0.46 0 09 0.55 !Impervious Cover(acres) 0.38 0.25 0.63 I 1.18 I ;Constants Runoff Coefficients(Rv) =Annual Rainfall(inches) 43 A Soils B Soils C Soils D Soils ar !Target Rainfall Event(Inches) 1.00 Forest/Open Space 0.02 0.03 0.04 0.05 !Total Phosphorus(TP)EMC(mg/1) 0.26 Managed Turf 0.15 0.20 0.22 0.25 !Total Nitrogen(TN)EMC(mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 Target TP Load(lb/acre/yr) 0.41 Pj(unitless correction factor) 0.90 Post-Development Requirement for Site Area TP Load Reduction Required(Ib/yr) 1.14 LAND COVER SUMMARY--POST DEVELOPMENT Land Cover Summary Treatment Volume and Nutrient Loads Treatment Volume Forest/Open Space Cover(acres) 0.00 (acre-ft) 0.0595 Weighted Rv(forest) 0.00 Treatment Volume(cubic feet) 2,590 %Forest 0% TP Load(lb/yr) 1.63 TN Load(Ib/yr) Managed Turf Cover(acres) 0.55 (Informational Purposes only) 11.64 Weighted Rv(turf) 0.21 %Managed Turf 47% Impervious Cover(acres) 0.63 Rv(impervious) 0.95 %Impervious 53% Site Area(acres) 1.18 Site Rv 0.60 • I 1 Site Results(Water Quality Compliance) Area Checks D.A.A D.A.B D.A.C D.A.D D.A.E AREA CHECK FOREST/OPEN SPACE(ac) 0.00 0.00 0.00 0.00 0.00 OK. IMPERVIOUS COVER(act 0.00 0.00 0.00 0.00 0.00 OK. IMPERVIOUS COVER TREATED(ac 0.00 0.00 0.00 0.00 0.00 OK. MANAGED TURF AREA 0.00 0.00 0.00 0.00 - 0.00 OK. I _ MANAGED TURF AREA TREATED(ac) 0.00 0.00 0.00 0.00 0.00 OK. AREA CHECK I_ OK. II OK. I OK. OK. II OK. Site Treatment Volume(ft3)l 0 I Runoff Reduction Volume and TP By Drainage Area I D.A.A II D.A.B II D.A.C II D.A.D II D.A.E II TOTAL RUNOFF REDUCTION VOLUME ACHIEVED(I?) 0 0 0 0 0 0 TP LOAD AVAILABLE FOR REMOVAL(Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 I TP LOAD REDUCTION ACHIEVED(Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REMAINING(Ib/yr)', 0.00 I 0.00 II 0.00 II 0.00 I 0.00 II 0.00 NITROGEN LOAD REDUCTION ACHIEVED(Ib/yr 0.00 II 0.00 II 0.00 II 0.00 II 0.00 I 0.00 I Total Phosphorus FINAL POST-DEVELOPMENT TP LOAD Ob/yr), 1.63 TP LOAD REDUCTION REQUIRED(Ib/yr)! 1.14 TP LOAD REDUCTION ACHIEVED(Ib/yr) 0.00 _ TP LOAD REMAINING(Ib/yr):111111113.11.i • REMAINING TP LOAD REDUCTION REQUIRED(lb/yr):. 1.14 Total Nitrogen(For Information Purposes) POST-DEVELOPMENT LOAD(Ib/yr)MEMXIM' NITROGEN LOAD REDUCTION ACHIEVED(Ib/yr)', 0.00• _ gg REMAINING POST-DEVELOPMENT NITROGEN LOAD(Ib/yr), 11.64 • -- - -. 4I I I I I •I I Nil w Me I i i I 1 ON 1 1 1 MO 1 I I ell i I I IleI 1 N 2 I f- o ^a on o ono M SO I a t V. 13 F o 0 0 I rnI ccI E. .0 0 o N I M o 0 0 0 0 m : I e .2 > 1 ilk d I S 8 0 1 d-5 uo 0 o I a m C I a. 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Custom Soil Resource Report pri Map Unit Legend ‘,11;1';‘; Albemarle CoWlty;Virginia{VA0(03) / w Mapinit Sjimbil Map Unit Name Acreg in A01 percent of A0l 27C Elioak loam,7 to 15 percent 0.3 3.6% slopes 34D Glenelg loam, 15 to 25 percent 7.4 77.7% slopes 91 Urban land 1.8 18.7% rri Totals for Area of Interest 9.5 100.0% ass Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area.The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas.A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils.On the landscape, +.1 however,the soils are natural phenomena, and they have the characteristic variability of all natural phenomena.Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class.Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic or classes.Consequently,every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. am Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a w particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management.These are called contrasting,or dissimilar,components.They generally are in small areas and could not be mapped separately because of the scale used. OM Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area,the contrasting minor components are identified in the map unit descriptions along with ✓ some characteristics of each.A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations w. to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If 10 8/10/2016 Precipitation Frequency Data Server an NOAA Atlas 14,Volume 2,Version 3 CHARLOTTESVILLE 2 W Station ID:44-1593 ,�3"r Location name:Charlottesville,Virginia, US* I ronr JIM Latitude:38.0325°, Longitude:-78.5231° 1 t* Elevation . MYR'v., Elevation(station metadata):870 ft* 'source:Google Maps es POINT PRECIPITATION FREQUENCY ESTIMATES G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley NOAA,National Weather Service,Silver Spring,Maryland Mt PF tabular 1 PF oraohica(I Maos & aerials .. PF tabular PDS-based point precipitation frequency estimates with 90%confidence intervals (in inches)1 Average recurrence interval(years) Duration am 1 2 5 10 25 50 100 200 500 1000 5-min0.352 0.420 0.492 0.553 0.623 0.677 0.727 0.774 0.831 0.877 (0.317-0.391) (0.379-0.466) (0.443-0.546) (0.497-0.612) (0.557-0.687) (0.602-0.746) (0.643-0.801) (0.681-0.853)(0.723-0.919) (0.756-0.973) me 10-min 0.563 0.671 0.788 0.884 0.992 1.08 1.16 1.23 1.31 1.38 (0.507-0.625) (0.605-0.745) (0.710-0.874) (0.794-0.979) (0.887-1.09) (0.959-1.19) (1.02-1.27) (1.08-1.35) (1.14-1.45) (1.19-1.53) 15-min 0.703 0.844 0.997 1.12 1.26 1.36 1.46 1.55 1.66 1.73 (0.634-0.781) (0.761-0.937) (0.898-1.10) (1.00-1.24) (1.13-1.39) (1.22-1.50) (1.29-1.61) (1.36-1.71) (1.44-1.83) (1.50-1.92) in 0.964 1.17 1.42 1.62 1.86 2.06 2.23 2.41 2.63 2.81 30-min (0.869-1.07) (1.05-1.29) (1.27-1.57) (1.46-1.79) (1.67-2.06) (1.83-2.27) (1.98-2.46) (2.12-2.66) (2.29-2.91) (2.42-3.11) 60-min (1.08-1.33) 1.46 1.82 2.11 2.48 2.78 3.08 3.38 3.78 4.10 (1.08-1.33) (1.32-1.62) (1.64-2.01) (1.90-2.34) (2.22-2.74) (2.48-3.07) (2.73-3.39) (2.97-3.73) (3.29-4.18) (3.53-4.55) iir 2-hr 1.44 1.75 2.19 2.57 3.07 3.47 3.90 4.33 4.94 5.45 (1.27-1.65) {1.53-2.00) (1.92-2.50) (2.26-2.92) (2.67-3.48) (3.01-3.94) (3.36-4.41) (3.70-4.90) (4.17-5.59) (4.56-6.19) 1.58 1.92 2.40 2.81 3.35 3.80 4.27 4.75 5.42 5.98 Mr (1.38-1.82)(1.38-1.82) (1.67-2.20) (2.09-2.76) (2.44-3.22) (2.90-3.83) (3.27-4.34) (3.65-4.87) (4.04-5.42) (4.54-6.19) (4.96-6.85) 6-hr 2.02 2.44 3.04 3.57 4.29 4.92 5.58 629 7.30 8.18 (1.79-2.29) (2.15-2.76) (2.67-3.43) (3.13-4.03) (3.74-4.84) (4.25-5.53) (4.78-6.27) (5.33-7.08) (6.10-8.22) (6.74-9.23) am 12-hr 2.54 3.07 3.83 4.53 5.52 6.39 7.33 8.37 9.90 11.3 (2.25-2.92) (2.71-3.51) (3.37-4.38) (3.97-5.17) (4.79-6.27) (5.49-7.25) (6.23-8.32) (7.02.9.48) (8.14-11.2) (9.12-12.8) 24-hr 3.04 3.68 4.71 5.57 6.84 7.93 9.14 10.5 12.5 142 (2.74-3.41) (3.32-4.12) (4.22-5.26) (4.98-6.20) (6.07-7.59) (6.99-8.79) (7.99-10.1) (9.05-11.6) (10.6-13.8) (11.9-15.6) mil 3.59 4.35 5.53 6.51 7.92 9.11 10.4 11.8 13.8 15.5 2-day (3.22-4.01) (3.91-4.86) (4.96-6.17) (5.81-7.25) (7.02-8.80) (8.01-10.1) (9.07-11.5) (10.2-13.1) (11.8-15.4) (13.1-17.3) 3-day 3.82 4.63 5.88 6.91 8.41 9.66 11.0 12.5 14.6 16.4 (3.47-4.23) (4.21-5.12) (5.34-6.50) (6.25-7.63) (7.56-9.27) (8.63-10.6) (9.76-12.1) (11.0-13.8) (12.7-16.2) (14.1-18.2) NI 4-day4.05 4.91 6.24 7.32 8.90 10.2 11.6 13.2 15.4 17.3 (3.73-4.45) (4.51-5.38) (5.72-6.84) (6.70-8.01) (8.10-9.73) (9.24-11.2) (10.5-12.7) (11.8-14.4). (13.6-16.9) (15.1-19.1) 4.71 5.67 7.09 8.25 9.93 11.3 12.8 14.4 16.7 18.6 s 7-day (4.34-5.12) (5.22-6.17) (6.52-7.71) (7.57-8.97) (9.05-10.8) (10.3-12.3) (11.5-13.9) (12.9-15.7) (14.7-18.2) (16.3-20.4) 10alay 5.34 6.41 7.91 9.13 10.9 12.3 13.7 15.3 17.6 19.4 (4.94-5.76) (5.93-6.92) (7.32-8.54) (8.43-9.85) (9.97-11.7) (11.2-13.2) (12.5-14.8) (13.8-16.6) (15.7-19.0) (17.1-21.1) i 20-day 7.01 8.36 10.1 11.5 13.3 14.8 16.3 17.8 19.9 21.5 (6.58-7.49) (7.85-8.94) (9.46-10.8) (10.7-12.2) (12.4-14.2) (13.7-15.8) (15.1-17.4) (16.4-19.1) (18.1-21.3) (19.5-23.1) 30-day (8.11-9.14) 102 12.1 13.5 15.3 16.7 18.1 19.5 21.2 22.6 (8.11-9.14) (9.61-10.8) (11.4-12.8) (12.7-14.3) (14.4-16.3) (15.7-17.8) (16.9-19.2) (18.1-20.7) (19.6-22.7) (20.8-24.1) i• 45-day 10.7 12.7 14.8 16.4 18.5 20.0 21.5 22.9 24.7 26.0 (10.2-11.4) (12.0-13.4) (14.0-15.7) (15.5-17.4) (17.4-19.5) (18.8-21.2) (20.1-22.7) (21.4-24.3) (23.0-26.3) (24.1-27.8) 60-day 12.6 14.8 17.1 18.8 21.0 22.6 24.1 25.6 27.4 28.8 (12.0-13.3) (14.1-15.6) (16.2.18.0) (17.8-19.8) (19.9-22.1) (21.3-23.8) (22.7-25.4) (24.0-27.0) (25.7-29.0) (26.8-30.5) MI 1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values. MN Please refer to NOM Atlas 14 document for more information. Back to Too http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?st=va&sta=44-1593&data=depth&units=english&series=pds 1/4