DIAGNOSTIC AND ASSESSMENT OF A URBAN BASIN SEWER SYSTEM at Riereta, Sant Boi de Llobregat, SPAIN
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DIAGNOSTIC AND ASSESSMENT OF A URBAN BASIN SEWER SYSTEM at Riereta, Sant Boi de Llobregat, SPAIN
AVANCE REPORT
Presentation Nº 1: “HYDRO LATIN AMERICA 2011”
Cochabamba. July 2011
Team Nº 4:
Juliana Martins Bahiense [email protected] Brazil
Juan Pablo Brarda [email protected] Argentina
Ronald Herbas Vargas [email protected] Bolivia
Cinthya Segales Cruz [email protected] Bolivia
STUDY AREA DESCRIPTION AND LOCALIZATION
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Sant Boi de Llobregat is located in the metropolitan area of Barcelona, in Barcelona province, Cataluña.
It has 82,428 inhabitants (INE 2009) and it occupies an area of 22 km2.The analysis area in this study is the urban watershed of La Riereta, located at old municipality of Sant Boi de Llobregat. It has an area of approximately 15.5 ha.
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At the standpoint of urban drainage, one of the main features of the basin is its high rate of impermeabilization which causes a significant increase on stormwater runoff.
Current state of sewerage system, concerning ducts sizes and antiquity, aggravates this problems.
1 – Increasing in volume
2 – Flow accelaration
3 – Runoff peak increasing
STUDY AREA DESCRIPTION AND LOCALIZATION
OBJETIVES
Hydrological and hydraulic behavior evaluating and diagnosing of an existing sewerage network in Riereta region, Sant Boi de Llobregat, through the use of EPA SWMM computer program.
• Determine in a given year, the probability of overcapacity occurrence in the network, to a certain series of precipitation;• Determine flooding volumes in the study area for that series;• Determine peak flow rates registered during the series;• Estimate flooding permanence during this period;• Determine vulnerable areas of flooding-related phenomena in the study area;• Assess safety level in existing sewer system for a given time of recurrence (TR), identifying maximum TR which do not have surface flooding occurrence and existing network works with free surface.
GeneralGeneralObjetive Objetive
Particular Particular ObjetiveObjetive
Based on available information
Topographic information of
the region
Urban parcelling
layout
Existingnetwork
sewerage
METHODOLOGICAL USED PROCESS
Satellite images support:
Characterization of impervious areas. Discharge form of roofs and buildings.
Definition of basins and
urban sub-basins
METHODOLOGICAL USED PROCESS
SUB-BASIN:SUB-BASIN: Definition of hydrological characteristics parameters
PPRROOCCEESSSS
LINKS: LINKS: Definition of hydraulic characteristics parameters
Construction of drainage topological schemeAnalysis of meteorological events - Construction of design rainfall.
Calibration and validation of model based on available hydrological information. Chosen events were Jordi, Fidel and Martina, recorded in the basin study.
Diagnosis of drainage system considering a design rainfall with 10 years TR and duration of one hour.
Determination of effective hyetographs to estimate runoff, regarding that runoff losses (PL) are constant. It can speed up the calibration process. Valid assumption for urban watersheds due to its fast response time.
Fulfill the objectives for Team No. 4.
METHODOLOGICAL USED PROCESS
GANT DIAGRAMGANT DIAGRAM
SHORT WATERSHED CHARACTERIZATION
• Riereta basin is located in the old town of Sant Boi de Llobregat, in the metropolitan area of Barcelona.
• The study basin is a urban type basin and has an area of about 15.5 ha.
• It presents high impermeabilization levels and it is completely urbanized. The houses are old.
• The terrain is extremely rugged with slopes ranging between 4% and 0.5%.
• Some of the distinctive characteristics of sewer system are: Combined sewer system; Concrete ducts with mostly circular sections and diameters ranging between 300 mm and 1200 mm; Linking ducts through concrete inspection chambers;
Satelyte image with basin delimitation. It can be viewed the high impermeabilzation hate
18 Subbasins18 Subbasins0.65 – 1.25 ha0.65 – 1.25 ha
SHORT WATERSHED CHARACTERIZATION
NETWORK SYSTEM
HYDROLOGICAL PARAMETERS DETERMINATION
CHARACTERISTIC WIDTH “W”:CHARACTERISTIC WIDTH “W”:
Given that real basins are not rectangular neither have symmetric and uniform properties, it is necessary to adopt a process that permit to estimate characteristic width to general situations.
Sk = (A2 – A1) / A W = (2 – Sk) * l
Sk = Correction factor; 0 ≤ Sk ≤ 1A1 = Area at one side of drainage
channelA2 = Area at other side of drainage
channelA = Total areal = Lenght of main drainage channel
Name Area [Ha]
Length [m]
A1 [Ha] A2 [Ha] SkW1 [m]
Slope [%]
Area Impervious
[%]
"n" Manning Imperv
"n" Manning Perv
SubC1 1,153 214,00 0,282 0,872 0,295 364,870 4,86% 84,770 0,015 0,250
SubC2 0,979 223,00 0,306 0,676 0,185 404,745 3,81% 87,735 0,015 0,250
SubC3 0,659 142,00 0,273 0,384 0,056 276,119 2,42% 86,345 0,015 0,250
SubC4 0,539 123,00 0,251 0,289 0,019 243,663 3,82% 79,961 0,015 0,250
SubC5 0,562 130,00 0,276 0,284 0,004 259,480 1,75% 88,871 0,015 0,250
SubC6 0,667 198,00 0,274 0,392 0,059 384,318 3,26% 90,301 0,015 0,250
SubC7 0,852 141,00 0,374 0,477 0,052 274,739 3,82% 91,205 0,015 0,250
SubC8 1,460 203,00 0,510 0,953 0,222 361,036 2,52% 79,326 0,015 0,250
SubC9 1,007 123,00 0,351 0,655 0,152 227,304 3,58% 84,001 0,015 0,250
SubC10 0,975 131,00 0,378 0,597 0,110 247,656 3,10% 89,094 0,015 0,250
SubC11 0,808 128,00 0,171 0,637 0,233 226,176 2,88% 98,921 0,015 0,250
SubC12 0,686 112,00 0,224 0,465 0,121 210,504 2,48% 100,000 0,015 0,250
SubC13 0,947 140,00 0,410 0,539 0,065 270,970 1,81% 97,395 0,015 0,250
SubC14 0,866 193,00 0,314 0,553 0,120 362,937 0,35% 94,264 0,015 0,250
SubC15 0,861 139,90 0,363 0,498 0,068 270,357 0,38% 94,025 0,015 0,250
SubC16 0,640 128,00 0,317 0,322 0,003 255,680 1,20% 94,532 0,015 0,250
SubC17 0,667 122,00 0,296 0,370 0,037 239,486 3,52% 91,455 0,015 0,250
SubC18 1,078 145,00 0,348 0,710 0,181 263,755 1,39% 85,055 0,015 0,250
TOTAL 15,406
SSUUBB--BBAASSIINNSS
HYDROLOGICAL PARAMETERS DETERMINATION
Cota (msnm)
Tramo D(mm) TI SI TF SF Long.(m) So.(%) "n" Rugosidad
2-6 600 33,941 32,141 29,971 28,671 53,81 6,45 0,013
6-13 600 29,971 28,671 27,593 26,593 52,77 3,94 0,013
13-19 600 27,593 26,593 26,777 25,227 37,95 3,60 0,013
19-20 600 26,777 25,227 26,047 24,447 46,65 1,67 0,013
20-21 600 26,047 24,447 25,201 23,454 34,39 2,89 0,013
21-30 600 25,201 23,454 25,073 23,173 9,74 2,89 0,013
30-48 600 25,073 23,173 25,178 22,554 22,55 2,75 0,013
15-22 300 27,25 26,25 26,889 25,589 55,27 1,20 0,013
22-33 400 26,889 25,589 26,427 23,327 58,67 3,86 0,013
82-70 500 38,342 36,042 32,496 30,696 81,44 6,56 0,013
70-33 500 32,496 30,696 26,427 23,327 70,54 10,45 0,013
33-31 400 26,427 23,327 25,909 22,509 51,14 1,60 0,013
31-48 400 25,909 22,509 25,178 22,554 55,46 -0,08 0,013
11-17 500 29,818 28,518 28,071 27,271 39,88 3,13 0,013
17-18 500 28,071 27,271 27,013 26,213 35,92 2,95 0,013
18-27 500 27,013 26,213 26,174 24,574 35,02 4,68 0,013
27-29 400 26,174 24,574 25,178 22,87 60,08 2,84 0,013
29-48 500 25,178 22,87 25,178 22,554 11,17 2,83 0,013
48-49 1000 25,178 22,554 23,6 20,368 38,06 5,74 0,013
49-51 1000 23,6 20,368 20,625 17,197 55,19 5,75 0,013
51-52 1000 20,625 17,197 19,459 15,459 30,24 5,75 0,013
47-52 300 23,225 21,725 19,459 15,459 61,5 10,19 0,013
52-53 1000 19,459 15,459 18,443 16,816 47,98 -2,83 0,013
53-127 1000 18,443 16,816 17,836 16,073 28,68 2,59 0,013
127-54 1000 17,836 16,073 17,199 15,294 30,07 2,59 0,013
54-50 1000 17,199 15,294 16,465 14,396 34,7 2,59 0,013
50-8 1200 16,465 14,396 15,432 13,132 48,79 2,59 0,013
7-8 600 16,748 14,18 15,432 13,132 41,19 2,54 0,013
8-9 1200 15,432 13,132 14,758 12,91 45,96 0,48 0,013
CCOONNDDUUCCTTSS
HYDRAULIC PARAMETERS DETERMINATION
NSubC1
SubC2
SubC3
SubC17
SubC4
SubC6
SubC5
SubC7
SubC8
SubC18
SubC16
SubC13
SubC12
SubC11
SubC10
SubC9SubC14
SubC15
NSubC1
SubC2
SubC3
SubC17
SubC4
SubC6
SubC5
SubC7
SubC8
SubC18
SubC16
SubC13
SubC12
SubC11
SubC10
SubC9SubC14
SubC15
D18
D8
D15-14
D9
D10
D11
D12
D13-16
D6- 7
D3
D4
D2 D1
NSubC1
SubC2
SubC3
SubC17
SubC4
SubC6
SubC5
SubC7
SubC8
SubC18
SubC16
SubC13
SubC12
SubC11
SubC10
SubC9SubC14
SubC15
NSubC1
SubC2
SubC3
SubC17
SubC4
SubC6
SubC5
SubC7
SubC8
SubC18
SubC16
SubC13
SubC12
SubC11
SubC10
SubC9SubC14
SubC15
D18
D8
D15-14
D9
D10
D11
D12
D13-16
D6- 7
D3
D4
D2 D1
NSubC1
SubC2
SubC3
SubC17
SubC4
SubC6
SubC5
SubC7
SubC8
SubC18
SubC16
SubC13
SubC12
SubC11
SubC10
SubC9SubC14
SubC15
D18
D8
D15-14
D9
D10
D11
D12
D13-16
D6- 7
D3
D4
D2 D1
SWMM MODEL SCHEME
CALIBRATION OF MODELIt is necessary to identify the parameters to be considered for calibration. It is known to use the MPLC with which values are not required pervious area (assuming the entire area impervious), second volume in depression will not be necessary. On that basis, the parameters used for the iterative process are:•Loss constant in mm / h [Pl]•Characteristic width in m [W]•"n" Impervious surface area Manning,•"n" Manning duct of the sewer system.The calibration is carried out with the event Fidel and validated for the events Martina and Jordi.
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DIAGNOSTIC AND ASSESSMENT OF A URBAN BASIN SEWER SYSTEM at Riereta, Sant Boi de Llobregat, SPAIN
AVANCE REPORT
Presentación Nº 1: “HYDRO LATIN AMERICA 2011”
Cochabamba. Julio de 2011
Team Nº 4:
Juliana Martins Bahiense [email protected] Brazil
Juan Pablo Brarda [email protected] Argentina
Ronald Herbas Vargas [email protected] Bolivia
Cinthya Segales Cruz [email protected] Bolivia