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Stormwater Report - 700 CHICKERING ROAD 12/29/1993
. D NAGE CALCULATION FOR HERITAGE AT NORTH ANDOVER NORTH ANDOVER, MASSACHUSETTS December 29, 1993 Owner: A®D•S ANDOVER GROUP & A-1)•S SENIOR HOUSING 139 Main Street Cambridge, Massachusetts Architect: CBT ARCHITECTS, INC. 60 Dartmouth Street Boston, Massachusetts 02116 Landscape Architect: GELLER ASSOCIATES, INC. 77 North Washington Street Boston, Massachusetts 02114 Civil Engineer. SITE ENGINEERING CONSULTANTS, INC. 137 Hammond Street Waltham, Massachusetts 02154 PRELIMINARY DRAINAGE CALCULATIONS FOR HERITAGE AT NORTH ANDOVER NORTH ANDOVER, MASSACHUSETTS December 23, 1993 Owner: A•D•S ANDOVER & A•D•S SENIOR HOUSING 159 Main Street Cambridge, Massachusetts Architect: CBT ARCHITECTS, INC. 60 Dartmouth Street Boston, Massachusetts 02116 Landscape Architect: GELLER ASSOCIATES, INC. 77 North Washington Street Boston, Massachusetts 02114 Civil Engineer: SITE ENGINEERING CONSULTANTS, INC. 137 Hammond Street Waltham, Massachusetts 02154 rn iro r1hou -4%., y�\ \l /�® ou I .d c►•"4 ®i �''•,•7to. '"�o o'• `: .-�-•�. ^�':�'``��.\\,`�, '� NJ v A 0• ORI 0 at .48g O.tv -po M-0 h' ne P#rk " ,z Wl of Fit 0 0 u Y W L,C1\', ,� i;� .�\ I,i Sbi it Agy B 11 in Pu P., ki 4, -,,Ir 00 --Nor ikil u Utr JJ �;rl. `} I i 125 U IN, f" NO *% rd 1v i cep) BM 7' %vv`r. :7M: I :1 •"1�> ryl/ lE:.�l �rl `r ii7.)/7- 13 I't ....... 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OF 137 Hammond Street Waltham, Massachusetts 02154 CALCULATED BY S DATE S— G (617) 891-8739 CONSULTING CIVIL ENGINEERS CHECKED BY DATE SCALE ST M L. Jjp) Elc MR NR 4E MEN T - •C7ESIGN Czi-rarziR - �IETIrop��OG� L SCS MIDIF/E � SOIL CovE2 Cot-IpI.EK 11i 7 OrJ DESIGN S ru2M �2EQuENCY 100 '-fERr�Z - Z4 1-/OVA STc) M ECIPITRTIoru TZATE . &. SD In C2 z- 4 EIr`S M IN IM u M TI ME PF CLAN C. arn/T2(a T IOIy (T� � c Q• / O hrs L= �o• O min� S l T L S v I L C L R S S 1F-- I G r�3 T I O N S S C b Q E C w r rS ) — FI HC St=7 F16'( LOAM 3.0 T �j,V�� SL Pc-S — G ZJ C_ ► IRL' LETON CCm1:3� rINE SFIt-1D,( LORM 3.0Tu 8,0� sLOP�S 3 �y N ca 1=� �u2�/E (�vY t Q e✓ RS �Gl�� L USE Sc>IL. YPr F- CN k-.Aj pS (GvoD COND.� C 70 LA wt-4 <C.vvD 7+ LRwti (C ov.D Col-ID.) 3 1 PAVE MEN-r/RooF S WpTF (z SLJIZFRCE S W E E T FL o w C f2.ITE TZ 1r:; Z 'f F- Fat - Z9 Hov2 STo TZ M <P., ) - 3. 1 1rl. fnE ri Z 4 hr5 ° ►"1 ra rl r-1 I 2 o v G &I 1'j o S S C O E r F I G 1 6 N•T Lrr) LRN[:> USE- n WODDS O. 4.O L-gwMS �42ASSES O. Z+ f'A v s "swr r oFS © - O I I TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 Date: 12-19-93 Project : N. Andover Senior Housing User : A. S. Date: County : Essex State: MA Checked : Subtitle: Predevelopment Runoff - Watershed 1 Subarea : Wat-1 - Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) -------------------------------------- FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns, parks etc. ) - 1. 33(61 ) 1.73(74) - Good condition; grass cover > 75% Impervious Areas - - 1. 58(98) - Paved parking lots, roofs, driveways 056(98). - - User defined urban (F9 to define) _ 100% % impervious O% % unconnected impervious 98 pervious curve number OTHER AGRICULTURAL LANDS - , 033(70) - Woods good - Total Area (by Hydrologic Soil Group) 1_33 339 ------------------------------------------------------ -------------- . SUBAREA: Wat-1 TOTAL DRAINAGE AREA: 4.729 Acres-----WEIGHTED-CURVE-NUMBER --- TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 User: A. S. Date: 12-19-93 Project N. Andover Senior Housing MA Checked: Date: _ County : Essex Subtitle: Predevelopment Runoff - Watershed i _ ____ Subarea #1 - Wat- ------------------ -------- ----- ocity Time Vel Flow Type 2 year Length Slope Surface n Area Wp rain (ft) (ft/ft) code (sq/f t) (ft) (ft/sec)--(hr) -------------------------------------------------- 0.361 Sheet 3. 1 248 .0452 f 0. 046 Shallow Concent' d 533 .0253 p 0.041 Shallow Concent' d 503 •0447 u Time of Concentration = 0.45* --- Sheet Flow Surface Codes - Shallow Concentrated --- A Smooth Surface F Grass, Dense -- G Grass Burmuda --- Surface Codes B Fallow (No Res. ) P Paved C Cultivated < 20 % Res. H Woods, Light U Unpaved D Cultivated > 20 % Res. 1 Woods, Dense p E Grass-Range, Short x - Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1 . 11 Project : N. Andover Senior Housing User : A. S. Date: 12-19-93 County : Essex State: MA Checked: Date: Subtitle: Predevelopment Runoff - Watershed 1 Total watershed area: 0. 007 sq mi Rainfall type: 11 Frequency: 100 years -------------------------- Subareas -------------------------- Wat-1 Area(sq mi ) 0. 01* Rainfall ( in) 6. 5 Curve number 79* Runoff (in) 4. 13 Tc (hrs) 0. 45* (Used) 0.40 TimeToOutlet 0.00 la/P 0. 08 (Used) 0. 10 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr ) Flow Wat-1 11. 0 1 1 11. 3 1 1 11.6 1 1 11. 9 2 2 12. 0 4 4 12. 1 8 8 12.2 14 14 12.3 i8P 1813 12.4 18 18 12. 5 13 13 12.6 9 9 12. 7 7 7 12. 8 5 5 13. 0 3 3 13.2 2 2 13. 4 2 2 13.6 2 2 13.8 1 1 14.0 1 1 14. 3 1 1 14.6 1 1 15.0 1 .1 15. 5 1 1 16.0 1 1 16.5 1 1 17.0 1 1 17.5 1 1 18. 0 1 1 19. 0 0 O 20.0 0 0 22.0 0 0 26.0 0 0 P - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 User : A. S. Date: 12-19-93 Project : N. Andover Senior Housing State: MA Checked: Date: - County : Essex Subtitle: Predevelopment Runoff - Watershed 2 Subarea : Wat-2 --------- ------------- Hydrologic Soil Group A B C D COVER DESCRIPTION Acres (CN) _ FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns, parks etc. ) - ,073(61 ) .468(74) Good condition; grass cover > 75% Impervious Areas - .533(98) - - Paved parking lots, roofs, driveways .027(98) - User defined urban (F9 to define) 100% % impervious 0% % unconnected impervious 98 pervious curve number OTHER AGRICULTURAL LANDS - . 133(70) - Woods good - Total Area (by Hydrologic Soil Group) .606 .628 --------------------------- SUBAREA: Wat-2 TOTAL DRAINAGE AREA: 1.234 Acres WEIGHTED CURVE-NUMBER_84- TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 User: A. S. Date: 12-19-93 Project : N. Andover Senior Housing Checked: Date: County : Essex State: MA Subtitle: Predevelopment Runoff - Watershed 2 _ ___ Subarea #1 - Wat-2 -------- ------- Flow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) _ ------------------------------------- --------------- 0.4 Sheet 3. 1 300 .0394 f 0.022 Shallow Concent' d 215 •0172 p 0.015 Shallow Concent' d 150 .0313 u Time of Concentration = 0. 48* --- Sheet Flow Surface Codes --- - Shallow Concentrated --- A Smooth Surface F Grass, Dense -- --- B Fallow (No Res. ) G Grass, Burmuda --- Surface Codes C Cultivated < 20 % Res. H Woods, Light P Paved D Cultivated > 20 % Res. I Woods, Dense U Unpaved E Grass-Range, Short - Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 Project : N. Andover Senior Housing User : A. S. Date: 12-19-93 County : Essex State: MA Checked: Date: Subtitle: Predevelopment Runoff - Watershed 2 Total watershed area: 0. 002 sq mi Rainfall type: II Frequency: 100-years -------------------------- Subareas -------------------- Wat-2 Area(sq mi ) 0.00* Rainfall ( in) 6. 5 Curve number 84* Runoff ( in) 4.67 Tc (hrs) 0.48* (Used) 0. 50 TimeToOutlet 0.00 la/P 0.06 (Used) 0. 10 Time Total ------------' Subarea Contribution to Total Flow (cfs) ----------- (hr) Flow Wat-2 11.0 0 0 11.3 0 0 11.6 0 0 11.9 1 1 12.0 1 1 12. 1 2 2 12.2 3 3 12. 3 4 4 12. 4 5P 5P 12. 5 5 5 12.6 4 4 12. 7 3 3 12.8 2 2 13. 0 1 1 13.2 1 1 13. 4 1 1 13.6 1 1 13. 8 0 0 14.0 0 0 14. 3 0 0 14.6 0 0 15. 0 0 0 15. 5 0 0 16. 0 O 0 16. 5 0 0 17. 0 0 0 17. 5 0 0 18.0 0 0 19.0 0 0 20. 0 0 0 22.0 0 0 26. 0 O 0 P - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 User: A. S. Date: 12-19-93 Project : N. Andover Senior Housing MA Checked: Date: County Essex Subtitle: Predevelopment Runoff - Watershed 3 Subarea : Wat-3 -------------------- -------------------- Hydrologic Soil Group C D COVER DESCRIPTION A B Acres (CN) -------------------------------- FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns, parks etc. ) _ - . 505(74) Good condition; grass cover > 75% Impervious Areas _ - 1.06(98) ' Paved parking lots, roofs, driveways OTHER AGRICULTURAL LANDS - , 143(70) Woods good ' Hydrologic Soil Group Total Area (by Hy ) 1.70 g ----- -------------- --------------------- . SUBAREA: Wat-3 TOTAL DRAINAGE AREA: 1 .708 Acres -WEIGHTED_CURVE_NUMBER8- TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1 . 11 Project : N Andover Senior Housing User: A. S. Date: 12-19-93 N. State: MA Checked: Date: County : Essex Subtitle: Predevelopment Runoff - Watershed 3 --------------------------- Subarea #1 - Wat-3 ----------------------------- Flow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) _______________________________________________________________________________ Sheet 3. 1 016 1 105 .O429 a ^ ~ 48B Sheet 188 . 0122 f 0.48B 033 Shallow Concent 'd 243 .0099 p 0.033 008 Shallow Concent 'd 146 .0877 u 0. 008 Time of Concentration = 0.55* ===== --- Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense --- Shallow Concentrated --- | B Fallow (No Res. ) G Grass, Burmuda --- Surface Codes --- | C Cultivated < 20 % Res. H Woods, Light P Paved D Cultivated > 20 % Res. I Woods, Dense U Unpaved | E Grass-Range, Short � * - Generated for use by TABULAR method � | | � � � ' | � ! � � ! ! � � � TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 Project : N. Andover Senior Housing User : A. S. Date: 12-19-93 County : Essex State: MA Checked : Date: Subtitle: Predevelopment Runoff - Watershed 3 Total watershed area: 0.003 sq mi Rainfall type: II Frequency: 100 years Subareas -------------------------- -------------------------- Wat-3 Area(sq mi ) 0. 00* Rainfall ( in) 6. 5 Curve number 89* Runoff ( in) 5.22 Tc (hrs) 0. 55* (Used) 0. 50 TimeToOutlet 0.00 Ia/P 0. 04 (Used) 0. 10 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Wat-3 11. 0 0 0 11. 3 0 0 11. 6 0 0 11. 9 1 1 12. 0 1 1 12. 1 2 2 12. 2 4 4 12. 3 7P 7P 12.4 7 7 12. 5 7 7 12.6 6 6 12. 7 4 4 12. 8 3 3 13. 0 2 2 13. 2 1 1 13. 4 1 1 13.6 1 1 13. 8 1 1 14.0 1 1 14. 3 1 1 14.6 1 1 15.0 0 O 15.5 0 0 16.0 0 0 16. 5 0 0 17. 0 0 0 17.5 0 0 18.0 0 0 19.0 0 0 2.0. 0 0 0 22.0 0 0 26.0 0 0 P - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 Project : N. Andover Senior Housing User : A. S. Date: 12-19-93 County : Essex State: MA Checked: Date: Subtitle: Predevelopment Runoff - Watershed 4 Subarea : Wat-4 ------------------------------------------------------------------------ Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ------------------------------------------------------------------------ FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns, parks etc. ) Good condition; grass cover > 75% - - .291 (74) - OTHER AGRICULTURAL LANDS Woods good - - . 114(70) - Total Area (by Hydrologic Soil Group) .405 ------------------------------------------------------------------ SUBAREA: Wat-4 TOTAL DRAINAGE AREA: .405 Acres WEIGHTED CURVE NUMBER:73 ---------------------------------------------------------------- TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 User : A. S. Date: 12°19-93 Project : N. Andover Senior Housing Checked: Date: County : Essex State: MA Subtitle: Predevelopment Runoff - Watershed 4 ___ ---------------------------- ____ _____ ---------------- Subarea lli - Wat-4 Velocity Time Flow Type 2 year Length Slope Surface n Area WP rain (ft) (ft/ft) code (sq/ft) (ft) ( ft/sec)--(hr) _ __ ---------------------- ------------------------------- 0.234 Sheet 3. 1 170 . 0624 f 0. 122 ' Sheet 58 . 1034 h Time of Concentration = 0.36* --- Sheet Flow Surface Codes --- - Shallow Concentrated --- A Smooth Surface F Grass, Dense -- G Grass, Burmu --- Surface Codes --- da B Fallow (No Res. ) P Paved C Cultivated < 20 % Res. H Woods, Light U Unpaved D Cultivated > 20 % Res. I Woods, Dense E Grass-Range, Short - Generated for use by TABULAR method TR-55 TABULAR DISCI4ARGE METHOD VERSION 1. 11 Project : N. Andover Senior Housing User : A. S. Date: 12-19-93 County : Essex State: MA Checked: Date: Subtitle: Predevelopment Runoff - Watershed 4 Total watershed area: 0. 001 sq mi Rainfall type: II Frequency: 100 years -------------------------- Subareas -------------------------- Wat-4 Area(sq mi ) 0.00* Rainfall ( in) 6. 5 Curve number 73* Runoff ( in) 3.51 Tc (hrs) 0.36* (Used) 0.40 TimeToOutlet 0.00 Ia/P 0. 11 Time Total ------------- Subarea Contribution to Total Flow (cfs) ------------ (hr) Flow Wat-4 11. 0 0 0 11. 3 0 0 11. 6 0 O 11. 9 0 0 12. 0 0 0 12. 1 iP iP 12.2 1 1 12. 3 1 1 12.4 1 1 12.5 1 1 12.6 1 1 12. 7 0 0 12.8 0 0 13. 0 0 0 13.2 0 0 13. 4 0 0 13.6 0 O 13. 8 0 0 14.0 0 0 14. 3 0 0 14.6 0 0 15.0 0 0 15.5 0 0 16. 0 0 0 16.5 0 0 17.0 0 0 17.5 0 0 18.0 0 0 19.0 0 0 20.0 0 0 22.0 0 0 26.0 0 0 P - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 Project : N. Andover Senior Housing User : A. S. Date: 12-22-93 County : Essex State: MA Checked: Date: Subtitle: Postdevelopment Runoff - Watershed i Subarea : Wat-1 ------------------------------------------------------------ Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ----------------------------------------------------------- FULLY DEVELOPED URBAN AREAS (Veg Estab. ) Open space (Lawns, parks etc. ) - Good condition; grass cover > 75% - 1.45(61) 1.96(74) Impervious Areas _ 1.35(98) Paved parking lots, roofs, driveways - - User defined urban (179 to define) - . 059(98) - - % impervious 100% % unconnected impervious 0% pervious curve number 98 OTHER AGRICULTURAL LANDS W - - . 055(70) Woods good - Total Area (by Hydrologic Soil Group) 1. 50 3.36 ------------------------------------------------ SUBAREA: Wat-i TOTAL DRAINAGE AREA: 4. 874 Acres-----WEIGHTED CURVE NUMBER:77 ------------------------------------------------ TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 User : A. S. Date: 12-22-93 oject : N. Andover Senior Housing MA Checked: Date: unty Essex btitle: Postdevelopment Runoff - Watershed 1 ______ Subarea #1 - Wat-1 ------ ---------------- Time Type 2 year Length Slope Surface n Area Wp Velocity ow g (s /ft) (ft) (ft/sec) (hr) rain (f t) (f t/f t) code - ------------- -------------f--- eet 3. 1 75.0 .092 0.008 eet 45.O .044 a O. 040 allow Concent' d 490. 0 . 0439 u Time of Concentration - 0. 15* --- Sheet Flow Surface Codes - Shallow Concentrated --- A Smooth Surface F Grass, Dense -- Surface Codes --- B Fallow (No Res. ) G Grass, Burmuda - p paved C Cultivated < 20 % Res. H Woods, Light U Unpaved D Cultivated > 20 % Res. I Woods, Dense E Grass-Range, Short Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 User: A. S. Date: 12-22°93 oject : N. Andover Senior House: MA Checked: Date: unty : Essex ibtitle: Postdevelopment Runoff - Watershed 1 ital watershed area: 0.008 sq mi Rainfall type: I1 Frequency: 100 years -------------------------- Subareas ------- Wat-1 ,ea(sq mi ) 0.01* LinfaI l ( in) 6. 5 irve number 77* inoff ( in) 3.92 (hrs) 0. 15* (Used) 0. 20 .meToOutlet 0. 00 ►/P 0. 09 (Used) 0. 10 '�me Total ------------- Subarea Contribution to Total Flow (cfs) ------------ ir) Flow Wat-1 L.0 1 i L.3 1 1 L.6 1 i L.9 6 6 ?.0 12 12 ?. l 22 22 !.2 24P 24P !.3 14 14 4 7 7 5 5 5 ?.6 4 4 ?. 7 3 3 z.8 3 3 3.0 2 2 3.2 2 2 3. 4 2 2 3.6 1 1 3. 8 J. 1 k.0 1 1 4. 3 1 1 k.6 1 1 5. 0 1 i 5. 5 1 1 3. 0 1 1 3.5 1 1 7.0 1 1 7.5 1 1 B. 0 1 1 9.0 0 0 0.0 0 0 2. 0 0 0 6. 0 O 0 - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION i. il User : A.S. Date: 12-22-93 roject : N. Andover Senior HouState° MA Checked : Date: aunty Essex ' ubtitle: Postdevelopment Runoff - Watershed 2 ibarea : Wat-2 ------------------- -------------------------- ------------- - Hydrologic Soil Group C D COVER DESCRIPTION A B Acres (CN) LILLY DEVELOPED URBAN AREAS (Veg Estab. ) pen space (Lawns, parks etc. ) - Good condition; grass cover > 75% .070(61) .703(74) wpervious Areas - .213(98) - - Paved parking lots, roofs, driveways - - - ser defined urban (F9 to define) .023(98)071 % impervious 1000 % unconnected impervious 98 pervious curve number THER AGRICULTURAL LANDS - . 100(70) - oods good - otal Area '(by Hydrologic Soil Group) .306 .803 ----------- ------------------------------------------------ ------------------ UBAREA: Wat-2 TOTAL DRAINAGE AREA: 1. 109 Acres WEIGHTED CURVE-NUMBER_---- TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 User : A. S. Date: 12°22-93 roject N. Andover Senior Housing Checked: Dates aunty : Essex State: MA ubtitle: Postdevelopment Runoff - Watershed 2 ------------------------- ---------------- Subarea #1 - Wat-2 Time Length Slope Surface n Area Wp Velocity low Type (s /ft) (ft) (ft/sec) (hr) (ft) (ft/ft) code 9 ---------------- -------------- - - --------------0. 500 heet 300.0 0293 f 0.027 hallow Concent' d 270.0 .0293 u 0.008 hallow Concent' d 90. 0 . 0422 u Time of Concentration = 0. 53# --- Sheet Flow Surface Codes - Shallow Concentrated --- A Smooth Surface F Grass, Dense Surface Codes --- B Fallow (No Res. ) G Grass, Burmuda p Paved C Cultivated < 20 % Res. H Woods, Light U Unpaved D Cultivated > 20 % Res. I Woods, Dense E Grass-Range, Short - Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 User: A. S. Date: 12-22°93 roject N. Andover Senior Housing Checked: Date: �e aunty : Esser State: MA ibtitle: Postdevelopment Runoff - Watershed 2 otal watershed area: 0.002 sq mi Rainfall type: 11 Frequency: 100-years Subareas --------------- ------ --- Wat-2 rea(sq mi ) 0. 00* ainfal l ( in) 6. 5 urve number 78* unoff (in) 4.02, c (hrs) 0. 53* (Used) 0.50 imeToOutlet 0.00 alp 0. 09 (Used) 0. 10 ime Total ------------- Subarea Contribution to Total Flow (cfs ------------ hr) Flow Wat-2 1.0 0 0 1. 3 0 0 1.6 0 0 1.9 0 0 2.0 1 1 2. 1 1 1 2.2 2 2 2.3 3 3 2.4 4P 4P 2. 5 4 4 2.6 3 3 2.7 2 2 2. 8 2 2 3.0 1 1 3.2 1 1 3.4 1 1 3.6 0 0 3.8 0 0 4.0 0 0 4.3 0 0 4.6 0 0 5.0 0 0 5. 5 0 0 6.0 0 0 6.5 0 0 7.0 0 0 7.5 0 0 8.0 0 0 9.0 0 0 :0.0 0 0 :2.0 0 0 :6.0 0 0 ' - Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 roject : N. Andover Senior Housing User : A. S. Date: 12-22-93 )unty : Essex State: MA Checked: Date: ibtitle: Postdevelopment Runoff - Watershed 3 lbarea : Wat-3 ----------------------------------------------- Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ----------------------------------------------- JLLY DEVELOPED URBAN AREAS (Veg Estab. ) pen space (Lawns, parks etc. ) - _ Good condition; grass cover > 75% - . 372(74) npervious Areas - _ Paved parking lots, roofs, driveways - . 380(98) THER AGRICULTURAL LANDS _ cods good - - .072(70) otal Area (by Hydrologic Soil Group) • 824 --------------- UBAREA: Wat-3 TOTAL DRAINAGE AREA: .824 Acres WEIGHTED CURVE NUMBER•85 TR-55 Tc and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 oject : N. Andover Senior Housing User : A. S. Date: 12-22-93 unty : Essex State: MA Checked: Date: btitle: Postdevelopment Runoff - Watershed 3 Subarea #1 - Wat-3 -----------P----------------- ow Type 2 year Length Slope Surface n Area W Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) -------------------------------------------------- eet 3. 1 270. 0 . 0163 a 0.049 eet 30.0 .050 f 0.064 Time of Concentration = 0. 11# Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense --- Shallow Concentrated --- B Fallow (No Res. ) G Grass, Burmuda --- Surface Codes --- C Cultivated < 20 % Res. H Woods, Light P Paved D Cultivated > 20 % Res. I Woods, Dense U Unpaved E Grass-Range, Short Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 aject : N. Andover Senior Housing User : A. S. Date: 12-22-93 inty : Essex State: MA Checked : Date: )title: Postdevelopment Runoff - Watershed 3 tal watershed area: 0. 001 sq mi Rainfall type: II Frequency: 100 years ------------ Subareas -------------------------- Wat-3 aa(sq mi ) 0.00* lnfall ( in) 6. 5 ,ve number 85x iof f ( in) 4.78 (hrs) O. 11* (Used) 0. 10 oeToOutlet 0.00 'P 0.05 (Used) 0. 10 ie Total ------------- Subarea Contribution to Total Flow (cfs) ------------ Flow Wat-3 0 0 0 3 O O 6 0 0 9 2 2 0 4 4 1 6P 6P 2 4 4 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 O 0 0 0 0 2 0 0 4 0 O 6 0 0 8 0 0 0 O 0 3 0 0 6 0 0 0 0 0 5 O O 0 0 0 5 O 0 0 0 0 5 0 O 0 0 0 0 0 0 0 O O 0 0 0 0 O 0 Peak Flow * - value(s) provided from TR-55 system routines TR-55 CURVE NUMBER COMPUTATION VERSION 1. 11 loject : N. Andover Senior Housing User : A. S. Date: 12-22-93 runty : Essex State: MA Checked: Date: ibtitle: Postdevelopment Runoff - Watershed 4 ibarea : Wat-4 --------------------------------------------------------------------- Hydrologic Soil Group COVER DESCRIPTION A B C D Acres (CN) ------------------------------------------------------------------------------ ILLY DEVELOPED URBAN AREAS (Veg Estab. ) yen space (Lawns, parks etc. ) Good condition; grass cover > 75% . 521 (74) ipervious Areas Paved parking lots, roofs, driveways - . 170(98) 'HER AGRICULTURAL LANDS - . 180(70) iods good ital Area (by Hydrologic Soil Group) • 871 ------------------------- --------------------------------------------------- BAREA: Wat-4 TOTAL DRAINAGE AREA: . 871 Acres WEIGHTED CURVE NUMBER:78 ----------------------------------------------------------------------------- TR-55 To and Tt THRU SUBAREA COMPUTATION VERSION 1. 11 10ject : N. Andover Senior Housing User: A. S. Date: 12-22-93 )unty : Essex State: MA Checked: Date: ibtitle: Postdevelopment Runoff - Watershed 4 Subarea #1 - Wat-4 ----------------------------- ow Type 2 year Length Slope Surface n Area Wp Velocity Time rain (ft) (ft/ft) code (sq/ft) (ft) (ft/sec) (hr) -------------- ---- ---------- ieet 3. 1 165.0 .0558 f 0.239 feet 55.0 .0600 h 0. 145 Time of Concentration = 0. 38x - Sheet Flow Surface Codes --- A Smooth Surface F Grass, Dense --- Shallow Concentrated --- B Fallow (No Res. ) G Grass, Burmuda --- Surface Codes --- C Cultivated < 20 % Res. H Woods, Light P Paved D Cultivated > 20 % Res. I Woods, Dense U Unpaved E Grass-Range, Short - Generated for use by TABULAR method TR-55 TABULAR DISCHARGE METHOD VERSION 1. 11 User: A. S. Date: 12-22-93 oject : N. Andover Senior Housing Checked: Date: unty : Essex State: MA btitle: Postdevelopment Runoff - Watershed 4 tal watershed area: 0.001 sq mi Rainfall type: -Il ----Frequency: -100-years --------------------- Subareas - Wat-4 ea(sq mi ) 0.00* infal l ( in) 6. 5 rve number 78* noff ( in) 4.02 (hrs) 0.38* (Used) 0.40 meToOutlet 0.00 /p 0.09 (Used) 0. 10 me Total ------------ Subarea Contribution to Total Flow (cfs) ------------ ir) Flow Wat-4 .0 0 0 .3 O O ..6 0 0 .. 9 0 0 t.0 1 1 >.2 3P 3P >_3 3 3 �.4 3 3 Z.5 2 2 Z.6 2 2 Z.7 1 1 Z.8 1 1 3.0 1 1 3.2 0 0 3. 4 0 0 3.6 0 0 3.8 0 O 4.0 0 0 4.3 0 O 4.6 0 0 5.0 0 0 5.5 0 0 6.0 0 0 6.5 0 0 7.0 O 0 7.5 0 0 B.0 0 0 9.0 0 0 0.0 0 O 2.0 0 0 6.0 O O - Peak Flow * - value(s) provided from TR-55 system routines TR-55 STORAGE VOLUME FOR DETENTION BASINS VERSION 1. 11 User: A. S. Date: 12-22-93 eject : N. Andover Senior Housing Checked: Date:inty : Essex State: MA (title: Approximate volume of required detention basin Drainage Area: 5.75 Acres Rainfall Frequency: 100 years Rainfall-Type: II Runoff Curve Number : 78 24-Hour Rainfall : 6. 5 inches Peak Inflow: 27 cf s Peak Outflow: 15 cf s Runoff Volume: 4.0 inches Detention Basin Storage Volume: 1.03 inches or 0. 5 acre feet DATE: ____/____/____ ROJECT: N. ANDOVER SENIOR HOUSING - #0078 SHEE7 : ____ OF_____ HYDROGRAPH FOR MEMORY # 1 ' __________________________ CUBIC FEET PER SECOND ********************* ]UR ). 0 0. 0 ). 1 0. 0 }. 2 0. 0 ). 3 0. 0 ). 4 0. 0 ). 5 0. 0 ). 6 0. 0 ). 7 0. 0 � ). 8 0. 0 ). 9 0. 0 . 2 ** 1 . 0 . 3 ** 1 . 0 . 4 ** 1 . 0 . 5 ** 1 . 0 � � . 6 ** 1 . 0 * 0 . 7 * 1 . � . 8 ** 1 . 0 . 9 . 0 . 1 ************************************************************* 29. 0 . 2 ****************************************************************** 31 . 0 . 3 . 4 *********************** 11 . 0 . 5 ***************** 8. 0 � . 6 ************** 7. 0 ! � . 7 . 8 ******** 4. 0 . 9 ******** 4. 0 � . 1 **** 2. 0 � . 2 **** 2. 0 � .3 **** 2. 0 � . 4 **** 2. 0 . 5 **** 2. 0 � . 6 ** 1 . 0 ! . 7 ** 1 . 0 � ** 0 � . 8 1 . � . 9 ** 1 . 0 . � 1 ** 1 0 . . � . 2 . 4 ** 1 . 0 . 5 ** 1 . 0 . 6 ** 1 . 0 7 ** 1 . 0 9 ** 1 . 0 � 0 ** 1 . 0 1 ** 1 . 0 2 ** 1 . 0 SHEET N0. • OT PROJECT No X0078 SASAKI ASE OCIATES. INC. DATE �Z�ZG X73 64 PLEASANT STREET nn TITLE LlizLQyycz SENIDe WATERTOWN. MA 02172 By /t-•�✓ CK'D .0 00 0 d' N r p N N v M o`J (V'l r c � a > \0 d . L H > Z U �- � 3 4) > N v) !� cLrr, < z � H < 0 N 00 d- o- o . , N > L DATE: OJECT:N. ANDOVER SENIOR HOUSING - #0078 SHEET: OF OUTFLOW HYDROGRAPH FOR POND # 1 ------------------------------- CUBIC FEET PER SECOND UR .0 0.O . 1 0.0 . 2 0. 0 .3 0.0 .4 0. 0 .5 0. 0 .6 0. O .7 0.O . 8 0. 0 .9 0. 0 .0 0. 2 . 1 # 0. 4 . 2 ** 0. 6 ,3 ** 0.7 ,4 ** 0. 8 ,5 * * 0.9 ,6 * 0. 9 7 * 1 .0 ,8 9 ******** 2. 1 0 ** ***************** 5.2 1 ***** * *********** ** * * * * * 10.0 2 * * ** *** ** * * * *************** ****** ** * * *** 13.9 '3 ***** * * * ********** **** * ** * ** ************** ** 15. 5 4 ******************** ***** ***** **** ***** ************* * *** 15.3 5 * **** * ******* * ******* *** ** ** **** ** * * * ** * 14.4 6 ** **** ** * *** *********** ******** ****** ***** 13.4 ,7 * * * * * * * **** * * ** ** ** **** 12.3 8 * * ** ** * *** * ***** ** * * **** ** 10. 5 9 ******* * ************ ********* 8. 8 i * * * *********** 6. 0 3 ************** * 4.0 4 ************** 3. 4 5 ***** * * 3.0 6 * ** * 2.5 7 ** 2. 1 8 * * 1.8 9 ****** 1.5 0 * 1.4 1 ***** 1.3 2 ***** 1.2 3 4 5 6 * 1. 0 7 **** 1. 0 8 * * 1. 0 9 * * 1.0 0 **** 1.0 i **** 1.0 2 **** 1.0 STORAGE POND II i DATA .--------------------------------------------------------------------------- TIME INFLOW OUTFLOW ELEVATION STORAGE HR. CFS CFS ACRE-FT. •--------------------------------------------------------------------------- 10. 0 0. 0 0.0 117. 6 0. 00 10. 1 0. 0 0.0 117. 6 0.00 10.2 0.0 0.0 117.6 0. 00 10.3 0.0 0. 0 117. 6 0.00 10.4 0.0 0.0 117. 6 0. 00 10. 5 0.0 0.0 117. 6 0.00 10.6 0.0 0.0 117. 6 0. 00 10. 7 0. 0 0.0 117. 6 0. 00 10.8 0. 0 0.0 117.6 0. 00 10. 9 0. 0 0.0 117. 6 0. 00 11. 0 1. 0 0.2 117.6 0. 01 11. 1 1.0 0.4 117. 7 0. 02 11. 2 1. 0 0.6 117. 8 0. 02 11.3 1.0 0.7 117. 8 0. 02 11.4 1.0 0.8 117.8 0. 02 11. 5 1.0 0.9 117.9 0. 02 11.6 1.0 0.9 117. 9 0. 03 11.7 1.0 1.0 117. 9 0. 03 11.8 1. 0 1.0 117. 9 0. 03 11. 9 8.0 2. 1 118.2 0. 07 12.0 17.0 5.2 118. 7 0. 17 12. 1 29.0 10.0 119. 7 0. 33 12.2 131.0 13.9 120.7 0. 47 12. 3 18.0 115.5 1121. 2 0. 4 12. 4 11.0 15.3 121. 1 0. 46 12.5 8.0 14.4 120.9 0.40 12.6 7. 0 13.4 120. 5 0. 35 12. 7 5. 0 12. 3 120. 1 0. 29 12.8 4.0 10.5 119. 8 0. 24 12.9 4. 0 8.8 119. 4 0.20 13.0 3.0 7.4 119.2 0. 16 13. 1 2.0 6.0 118. 9 0. 13 13.2 2.0 4.8 118. 7 0. 10 13. 3 2.0 4.0 i 18. 5 0. 09 13.4 2.0 3.4 118.4 0. 08 13. 5 2. 0 3.0 118. 3 0. 07 13.6 1.0 2.5 118.3 0. 06 13.7 1.0 2. 1 118. 2 0.05 13.8 1.0 1.8 118. 1 0. 04 13.9 1.0 1. 5 118. 1 0. 04 14.0 1.0 1.4 118.0 0.03 14. 1 1.0 1.3 118. 0 0.03 14.2 1.0 1.2 118.0 0. 03 14.3 1.0 1. 1 117.9 0.03 14.4 1.0 1. 1 117. 9 0. 03 14. 5 1.0 1. 1 117.9 0.03 14.6 1.0 1.0 117. 9 0. 03 14. 7 1.0 1.0 117. 9 0. 03 14.8 1. 0 1.0 117.9 0. 03 14. 9 1.0 1.0 117.9 0. 03 15.0 1.0 1.0 117.9 0. 03 15. 1 1.0 1.0 117. 9 0. 03 is_ 2 1 . 0 1.0 117.9 0. 03 Sheet no. of (4)ISO (5) 10,000 e t C 168 ,000 EXAMPLE )a. (2) (3) 156 6,000 D•42 I•cnee j3,s futj 8. 6• 6 144 5,000 0+120 cft 132 4,000 r—W• mw 6. 5. D Ica 12C 3,000 111 E.s 4.4 3. 4., 4. 2,000 12) 2.1 7.4 108 131 2.2 7.7 4. 3. •D In a.r 3. 96 1,000 3. 800 --- 84 —e 2. 600 500 72 400 / c 2. W --- boo _ 1.3 1.5 ' N = 60 u 200 W 1.3 Z w C 54 / 5 � a a w 48 W 100 80 = t- 42 u 50 a 1.0 — 1.0 HO SCALE FN TYPE C�cc 1.0 40 /t � 36 30 (il s40ue 6410.1tA 3 3 .9 I .9 33 ���Oroll p` 20 '121 GrNU ••d with W 30 S .8 .8 131 Grua.end .8 2? p•j•a4l 10 24 8 .t T 'T 6 To an loots(2) or(3)Onjut 21 % 5 horizontally to ►ca•11),tM6ok 4 rN artlshl Ioalnol lino throoah 0 on1 0 ►eau,or reverse u 3 ►Ilrarolad. 6 .6 6 ,IB • 11.0 S .3 12 Exhibit 3-9 Headwater depth for concrete �ipcul-- ts'wit- tom inlet control (Ref. Hyd. Eng. Cir. No. 5, USBPR, to 4 1965)