cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.4121/uuid:f42b7b2f-2f71-45a4-9c08-043e58940827
title: Calibrated DTS data, Maisbich, 2010-07

description: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich, Luxemburg Parent item: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich Explanation of the calibration procedure of the DTS derived temperatures in the Maisbich river, Luxembourg. Note that it only corrects offsets orriginating from the DTS device (Halo, Sensornet, UK). It does NOT correct for periods when the cable is not properly submerged in the stream. The DTS obtained temperatures were calibrated with five independent temperature loggers (TidbiT v2 Temp logger, HOBO, USA) located along the cable at 26, 395, 931, 1111 and 1270 m from the DTS desktop computer, respectively. Note that the investigated branch lies between 717 (V-notch weir Q3) and 1282 m (V-notch weir Q4) from the desktop computer. For each Tidbit temperature logger, which measured at a 6 min interval, a linear relation was determined between the DTS derived temperature and the difference between the TidbiT and DTS derived temperature for the period 4-Apr-2008 until 4-Dec-2008 (dT = a*T_DTS + b). For each Tidbit location a slope (a) and an offset (b) was determined: Tidbit Distance(m) a b T coolbox 26 -1.31 0,0974 T road 395 -0.49 0,0664 T Mai171u 931 -0.69 0,122 T Mai11u 1111 -0.25 0,109 T Q4-2 1270 -0.056 0,0965 Then a lineair relation between distance from the DTS desktop computer and slope (a_slope + b_slope*X), and between distance from desktop computer and offset (a_offset + b_offset*X) was derived, resulting in an offset as a function of distance and DTS derived temperatures. Subsequently, this offset was added to the initial DTS derived temperatures. Tcal = T_DTS + ( a_slope + b_slope*X)T_DTS + (a_offset + b_offset*X) with: a_slope :0.085 b_slope :1.78e-005 a_offset:-1.16 b_offset:8.03e-004 In the last step the distance was reversed, with the upstream V-notch weir Q4 at 0 m. Only the part between V-notch weirs Q4 and Q3 (at 565 m) are shown. Measuring instrument: Fibre optic Distributed Temperature Sensor DTS, Maisbich, Luxemburg The fibre optic Distributed Temperature Sensing (DTS) system measures the water temperature along the entire stream. It consists of a dedicated desktop computer with built-in data-acquisition and processing software, to which a fibre optic cable is attached. Short laser pulses (in the order of a few nanoseconds) are sent through the fibre optic cable. When light strikes matter a small portion of the light may be reflected. By measuring the time between the moment the laser pulse is sent through the cable and the moment a reflected photon comes back, the location of reflectance can be determined, since the speed of light in glass is known. The system is from Halo, Sensornet, UK, and has a spatial resolution of 2 m and a temporal resolution of 3 min. This configuration results in a precision of ∼0.1◦C.
DOI: 10.4121/uuid:f95014c6-b660-437b-9b9a-e5e90db980f9
title: Calibrated DTS data, Maisbich, 2009-01

description: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich, Luxemburg Parent item: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich Explanation of the calibration procedure of the DTS derived temperatures in the Maisbich river, Luxembourg. Note that it only corrects offsets orriginating from the DTS device (Halo, Sensornet, UK). It does NOT correct for periods when the cable is not properly submerged in the stream. The DTS obtained temperatures were calibrated with five independent temperature loggers (TidbiT v2 Temp logger, HOBO, USA) located along the cable at 26, 395, 931, 1111 and 1270 m from the DTS desktop computer, respectively. Note that the investigated branch lies between 717 (V-notch weir Q3) and 1282 m (V-notch weir Q4) from the desktop computer. For each Tidbit temperature logger, which measured at a 6 min interval, a linear relation was determined between the DTS derived temperature and the difference between the TidbiT and DTS derived temperature for the period 4-Apr-2008 until 4-Dec-2008 (dT = a*T_DTS + b). For each Tidbit location a slope (a) and an offset (b) was determined: Tidbit Distance(m) a b T coolbox 26 -1.31 0,0974 T road 395 -0.49 0,0664 T Mai171u 931 -0.69 0,122 T Mai11u 1111 -0.25 0,109 T Q4-2 1270 -0.056 0,0965 Then a lineair relation between distance from the DTS desktop computer and slope (a_slope + b_slope*X), and between distance from desktop computer and offset (a_offset + b_offset*X) was derived, resulting in an offset as a function of distance and DTS derived temperatures. Subsequently, this offset was added to the initial DTS derived temperatures. Tcal = T_DTS + ( a_slope + b_slope*X)T_DTS + (a_offset + b_offset*X) with: a_slope :0.085 b_slope :1.78e-005 a_offset:-1.16 b_offset:8.03e-004 In the last step the distance was reversed, with the upstream V-notch weir Q4 at 0 m. Only the part between V-notch weirs Q4 and Q3 (at 565 m) are shown. Measuring instrument: Fibre optic Distributed Temperature Sensor DTS, Maisbich, Luxemburg The fibre optic Distributed Temperature Sensing (DTS) system measures the water temperature along the entire stream. It consists of a dedicated desktop computer with built-in data-acquisition and processing software, to which a fibre optic cable is attached. Short laser pulses (in the order of a few nanoseconds) are sent through the fibre optic cable. When light strikes matter a small portion of the light may be reflected. By measuring the time between the moment the laser pulse is sent through the cable and the moment a reflected photon comes back, the location of reflectance can be determined, since the speed of light in glass is known. The system is from Halo, Sensornet, UK, and has a spatial resolution of 2 m and a temporal resolution of 3 min. This configuration results in a precision of ∼0.1◦C.
DOI: 10.4121/uuid:fb67e8c1-d77c-4725-a9a1-8587e95c1d9a
title: Calibrated DTS data, Maisbich, 2010-08

description: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich, Luxemburg Parent item: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich Explanation of the calibration procedure of the DTS derived temperatures in the Maisbich river, Luxembourg. Note that it only corrects offsets orriginating from the DTS device (Halo, Sensornet, UK). It does NOT correct for periods when the cable is not properly submerged in the stream. The DTS obtained temperatures were calibrated with five independent temperature loggers (TidbiT v2 Temp logger, HOBO, USA) located along the cable at 26, 395, 931, 1111 and 1270 m from the DTS desktop computer, respectively. Note that the investigated branch lies between 717 (V-notch weir Q3) and 1282 m (V-notch weir Q4) from the desktop computer. For each Tidbit temperature logger, which measured at a 6 min interval, a linear relation was determined between the DTS derived temperature and the difference between the TidbiT and DTS derived temperature for the period 4-Apr-2008 until 4-Dec-2008 (dT = a*T_DTS + b). For each Tidbit location a slope (a) and an offset (b) was determined: Tidbit Distance(m) a b T coolbox 26 -1.31 0,0974 T road 395 -0.49 0,0664 T Mai171u 931 -0.69 0,122 T Mai11u 1111 -0.25 0,109 T Q4-2 1270 -0.056 0,0965 Then a lineair relation between distance from the DTS desktop computer and slope (a_slope + b_slope*X), and between distance from desktop computer and offset (a_offset + b_offset*X) was derived, resulting in an offset as a function of distance and DTS derived temperatures. Subsequently, this offset was added to the initial DTS derived temperatures. Tcal = T_DTS + ( a_slope + b_slope*X)T_DTS + (a_offset + b_offset*X) with: a_slope :0.085 b_slope :1.78e-005 a_offset:-1.16 b_offset:8.03e-004 In the last step the distance was reversed, with the upstream V-notch weir Q4 at 0 m. Only the part between V-notch weirs Q4 and Q3 (at 565 m) are shown. Measuring instrument: Fibre optic Distributed Temperature Sensor DTS, Maisbich, Luxemburg The fibre optic Distributed Temperature Sensing (DTS) system measures the water temperature along the entire stream. It consists of a dedicated desktop computer with built-in data-acquisition and processing software, to which a fibre optic cable is attached. Short laser pulses (in the order of a few nanoseconds) are sent through the fibre optic cable. When light strikes matter a small portion of the light may be reflected. By measuring the time between the moment the laser pulse is sent through the cable and the moment a reflected photon comes back, the location of reflectance can be determined, since the speed of light in glass is known. The system is from Halo, Sensornet, UK, and has a spatial resolution of 2 m and a temporal resolution of 3 min. This configuration results in a precision of ∼0.1◦C.
DOI: 10.4121/uuid:ffcf3183-5714-462a-97cf-927ccb783631
title: Calibrated DTS data, Maisbich, 2008-10

description: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich, Luxemburg Parent item: Calibrated fibre optic Distributed Temperature Sensing (DTS) data, Maisbich Explanation of the calibration procedure of the DTS derived temperatures in the Maisbich river, Luxembourg. Note that it only corrects offsets orriginating from the DTS device (Halo, Sensornet, UK). It does NOT correct for periods when the cable is not properly submerged in the stream. The DTS obtained temperatures were calibrated with five independent temperature loggers (TidbiT v2 Temp logger, HOBO, USA) located along the cable at 26, 395, 931, 1111 and 1270 m from the DTS desktop computer, respectively. Note that the investigated branch lies between 717 (V-notch weir Q3) and 1282 m (V-notch weir Q4) from the desktop computer. For each Tidbit temperature logger, which measured at a 6 min interval, a linear relation was determined between the DTS derived temperature and the difference between the TidbiT and DTS derived temperature for the period 4-Apr-2008 until 4-Dec-2008 (dT = a*T_DTS + b). For each Tidbit location a slope (a) and an offset (b) was determined: Tidbit Distance(m) a b T coolbox 26 -1.31 0,0974 T road 395 -0.49 0,0664 T Mai171u 931 -0.69 0,122 T Mai11u 1111 -0.25 0,109 T Q4-2 1270 -0.056 0,0965 Then a lineair relation between distance from the DTS desktop computer and slope (a_slope + b_slope*X), and between distance from desktop computer and offset (a_offset + b_offset*X) was derived, resulting in an offset as a function of distance and DTS derived temperatures. Subsequently, this offset was added to the initial DTS derived temperatures. Tcal = T_DTS + ( a_slope + b_slope*X)T_DTS + (a_offset + b_offset*X) with: a_slope :0.085 b_slope :1.78e-005 a_offset:-1.16 b_offset:8.03e-004 In the last step the distance was reversed, with the upstream V-notch weir Q4 at 0 m. Only the part between V-notch weirs Q4 and Q3 (at 565 m) are shown. Measuring instrument: Fibre optic Distributed Temperature Sensor DTS, Maisbich, Luxemburg The fibre optic Distributed Temperature Sensing (DTS) system measures the water temperature along the entire stream. It consists of a dedicated desktop computer with built-in data-acquisition and processing software, to which a fibre optic cable is attached. Short laser pulses (in the order of a few nanoseconds) are sent through the fibre optic cable. When light strikes matter a small portion of the light may be reflected. By measuring the time between the moment the laser pulse is sent through the cable and the moment a reflected photon comes back, the location of reflectance can be determined, since the speed of light in glass is known. The system is from Halo, Sensornet, UK, and has a spatial resolution of 2 m and a temporal resolution of 3 min. This configuration results in a precision of ∼0.1◦C.
DOI: 10.4121/uuid:0e38dcc8-d524-4abf-ab59-5c9a38075dc3
title: All data measured by discharge meter in Attert basin

description: Measuring instrument: Useldange, Attert basin: Discharge meter ISCO 4120 ultrasonic sensor (ceramic pressure membrane). Measures water pressure (?). The sensor is installed under a bridge (?).
DOI: 10.4121/uuid:284697ee-9dbe-4f63-b4fb-d5e8e3bc4606
title: Maisbich (Luxemburg) temperature data, sensor 1209371_house

description: Measuring instrument: Temperature sensor 1209371_house, Maisbich (Luxemburg) Temperature sensor,TidbiT v2 temp logger: Hobo USA. Air temperature inside house. The sensor is placed next to a roll of ca 50 m of DTS fiber optic cable.
DOI: 10.4121/uuid:34b99d51-e7f2-4a84-b046-40a4814eed38
title: All data measured by meteorological station in Huewerbach basin

description: Measuring instrument: Huewelerbach basin: Meteorological station
DOI: 10.4121/uuid:35a2500d-298c-4c01-abab-99af29fb8581
title: Maisbich (Luxemburg) temperature data, sensor 1239545_SPOT_upstr (T 104m up)

description: Measuring instrument: Temperature sensor 1239545_SPOT_upstr (T 104m up), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water just upstream of lateral inflow at 104 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:387da9e9-7967-4296-8bf5-a2b793e1dc7b
title: Maisbich (Luxemburg) temperature data, sensor 1209369_SPOT (T 104m inflow)

description: Measuring instrument: Temperature sensor 1209369_SPOT (T 104m inflow), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of lateral inflow at 104 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:452c7a97-399b-422e-9fa5-c43f45785897
title: Maisbich (Luxemburg), measured data from discharge meter Q2

description: Measuring instrument: Maisbich basin: V-notch discharge meter Q2 Type: Pressure Sensor Keller DCX-4.0, SN 1466 This instrument is based on differential pressure measurement of two absolute sensors. The sensors measure pressure and temperature. Height of V-notch above sensor: -0.017m.
DOI: 10.4121/uuid:460ed8b3-b668-4e6c-9205-5c8a1b50700e
title: Maisbich (Luxemburg) temperature data, sensor 1209370_road

description: Measuring instrument: Temperature sensor 1209370_road, Maisbich (Luxemburg) Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water at ca 280 m from V-notch weir Q3
DOI: 10.4121/uuid:491cb804-2339-40e7-9724-214408852f17
title: All data measured by pluviometer in Huewerbach basin

description: Measuring instrument: Huewelerbach basin: Pluvio meters Array of pluvio meters.
DOI: 10.4121/uuid:4bb1dc97-509c-472e-bf4c-fbe32b68abb0
title: All data measured by meteorological station in Maisbich basin

description: Measuring instrument: Maisbich basin: Weather station Type HOBO Weather Station. Measures: rain, wind, gust speed, wind direction, temperature, relative humidity, solar radiation.
DOI: 10.4121/uuid:5094d96d-a74c-40b9-8d2b-54b1dd8f3241
title: All data measured by interception measurement device in Huewerbach basin

description: Measuring instrument: Huewelerbach basin: Interception measurement device According to original data the location is Westerbork NL but this is probably wrong Evaporation measument. Area basin 1.00 m2, 2x3 strain gauges: type FLA-6, resistance 120 Ohm. Valve (&lt; 18 jan 2006): electronic magnetic valve Type: MBMG2Z-1263008-12V. (KOBOLD Instrumentatie BV, Arnhem) Valve (&gt;=18 jan 2006): electronic magnetic valve (12VDC) Type: MBMG2Z-1264020. Messing 3/4 " (KOBOLD Instrumentatie BV, Arnhem) Temperature sensor: LM335, output 10 mV/K (Farnell). Throughfall: tipping bucket & pluvio meters.
DOI: 10.4121/uuid:5138554c-b41d-427d-87be-023c27a95d02
title: Maisbich (Luxemburg) temperature data, sensor 1239550_SPOT_downstr (T 104m down)

description: Measuring instrument: Temperature sensor 1239550_SPOT_downstr (T 104m down), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water just downstream of lateral inflow at 104 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:5b82f3c9-c48a-4e01-983d-e1e20e39027c
title: Maisbich (Luxemburg) temperature data, sensor 1209366_laser

description: Measuring instrument: Temperature sensor 1209366_laser, Maisbich (Luxemburg) Temperature sensor,TidbiT v2 temp logger: Hobo USA. Air temperature inside house. Sensor is placed in front of ventilation opening of the DTS desktop computer
DOI: 10.4121/uuid:61691045-9dcf-49dd-abec-da11c28d7c38
title: Maisbich (Luxemburg), measured data from discharge meter Q1, 2003-12 to 2008-05

description: Measuring instrument: Maisbich basin: V-notch discharge meter Q1 Type: Pressure Sensor Keller DCX-4.0, SN 1454 This instrument is based on differential pressure measurement of two absolute sensors. The sensors measure pressure and temperature. Height of V-notch above sensor: hV=0.145m. The discharge is calculated with the rating curve Q=C*(h-hV)^2.5 where C is a calibration constant and h results from the pressure difference (Willem Luxemburg, Martijn Westhoff).
DOI: 10.4121/uuid:61e4eb3f-83ad-462d-b9ca-d151b717f8e3
title: DENlab solar data

description: Measuring instrument: DENlab solar panels Array of 180 solar panels, installed on the roof of the lower EWI building. Each pair of solar panels in serially connected to an inverter. The inverters convert the DC current into AC current. Each panel is 70 Watt, the inverter is 100 Watt. The total generated capacity = 90 * 100 = 9 KW. The solar data is measured each 10 s. Solar panel type: RSM-70 from Shell Solar. Inverter type: OK4E from NKF Electronics.
DOI: 10.4121/uuid:6571e0bc-1d4d-41ca-adf9-b3b017db91a6
title: All data measured by discharge meter in Michelau, Sure basin

description: Measuring instrument: Michelau, Sure basin: Discharge meter ISCO 4110 ultrasonic sensor. The sensor is installed under a bridge. Measured distance between water level and sensor level (?)
DOI: 10.4121/uuid:65a06005-d910-40ea-9a77-c4f142d40bb0
title: Darelux River Basin Hydrology measurement data sets (old version)

description: Hydrological measurements collected in a river catchment area in Luxembourg and Westerbork (Netherlands).
DOI: 10.4121/uuid:65ad02d7-8380-4921-9f2e-bb0f1a6e061f
title: Maisbich (Luxemburg) temperature data, sensor 1239547_M11_upstr (T 178m up)

description: Measuring instrument: Temperature sensor 1239547_M11_upstr (T 178m up), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water just upstream of lateral inflow at 178 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:67ef39b6-3184-407e-8173-f6af77ac74cd
title: Maisbich (Luxemburg) temperature data, sensor 1209365_Mai171 (T 350m inflow)

description: Measuring instrument: Temperature sensor 1209365_Mai171 (T 350m inflow), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of lateral inflow at 350 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:71a2982f-6676-4215-9c45-603b97a7aeeb
title: All data measured by tipping bucket discharge meter in Maisbich

description: Measuring instrument: Maisbich basin: Tipping bucket rainfall meter Type: Casella Tipping Bucket 100000 E This instrument measures rainfall by counting the times a bucket tips over due to filling with rainfall. Aperture 400 cm3 (?) Bucket size 0.2mm (?)
DOI: 10.4121/uuid:754bf0ad-09f5-4a1f-947e-7b09d1ace799
title: All data measured by tipping bucket discharge meter in Westerbork

description: Measuring instrument: Westerbork: Tipping bucket rainfall meter HOBO data logging rain gauge RG2-M-0.2mm (tipping bucket)
DOI: 10.4121/uuid:7be0793b-4080-4e58-8e91-f05fdd9a6f1d
title: Maisbich (Luxemburg) temperature data, sensor 1239546_coolbox

description: Measuring instrument: Temperature sensor 1239546_coolbox, Maisbich (Luxemburg) Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of water in a box. In the same box ca 30 m of DTS fiber optic cable measues temperature.
DOI: 10.4121/uuid:7fec17aa-26f2-498f-a74c-75e2bb90465f
title: Maisbich (Luxemburg) temperature data, sensor 1209364_Q4-2

description: Measuring instrument: Temperature sensor 1209364_Q4-2 (T 20m), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water ca 20 m downstream of V-notch weir Q4.
DOI: 10.4121/uuid:8b5aa4a7-04af-4ccf-98ba-8f10bb41b2c6
title: Maisbich (Luxemburg) temperature data, sensor 1239551_PM171_upstr (T 350m up)

description: Measuring instrument: Temperature sensor 1239551_PM171_upstr (T 350m up), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water just upstream of lateral inflow at 350 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:8d9da1bd-0f33-4ea9-99f7-01280864522e
title: All data measured by interception measurement device in Westerbork

description: Measuring instrument: Westerbork: Interception measurment device Evaporation measurement. Area basin 0.36 m2, 2x3 strain gauges: type FLA-6, resistance 120 Ohm. Valve (&lt; 18 jan 2006): electronic magnetic valve Type: MBMG2Z-1263008-12V. (KOBOLD Instrumentatie BV, Arnhem) Valve (&gt; 18 jan 2006): electronic magnetic valve (12VDC) Type: MBMG2Z-1264020. Messing 3/4 "(?) (KOBOLD Instrumentatie BV, Arnhem) Temperature sensor: LM335, output 10 mV/K (Farnell).
DOI: 10.4121/uuid:90b95ede-21a5-43d3-a875-b9996e133204
title: Maisbich (Luxemburg) temperature data, sensor 1239554_M171_downstr (T 350m down)

description: Measuring instrument: Temperature sensor 1239554_M171_downstr (T 350m down), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of stream water just downstream of lateral inflow at 350 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:92bbf681-45e5-481f-b46a-d36f950bf882
title: Maisbich (Luxemburg), calculated data from discharge meter Q2

description: Measuring instrument: Maisbich basin: V-notch discharge meter Q2 Type: Pressure Sensor Keller DCX-4.0, SN 1466 This instrument is based on differential pressure measurement of two absolute sensors. The sensors measure pressure and temperature. Height of V-notch above sensor: -0.017m. Contributor: Durr, E.H.(Eugene)
DOI: 10.4121/uuid:9604a1b0-13b6-4f23-bd6c-bb028591307c
title: DENlab wind data

description: Measuring instrument: DENlab wind speed meter Standard aenemometer as commonly used in water sports.
DOI: 10.4121/uuid:96c138f0-c5e7-4c11-bb4e-f9be4f1efc3b
title: Maisbich (Luxemburg) temperature data, sensor 1209368_Mai11 (T 178m inflow)

description: Measuring instrument: Temperature sensor 1209368_Mai11 (T 178m inflow), Maisbich LUX Temperature sensor,TidbiT v2 temp logger: Hobo USA. Temperature of lateral inflow at 178 m downstream of V-notch weir Q4
DOI: 10.4121/uuid:97925264-6e18-442e-8033-7fa02941af9d
title: Maisbich (Luxemburg), data from discharge meter Q4 (Qup), 2006-12 and later

description: Measuring instrument: Maisbich basin: V-notch discharge meter Q4 (Qup) Type: Van Essen TD-Driver, SN 19613 This instrument measures pressure with one absolute sensor. It also measures temperature. Height V-notch above sensor: 0.0018m. Datasets with correction contain the corrected discharge observed at the Vnotch. The discharge is calculated as Q=Cd*h^2.5 After correcting the logger measurements with hand measured depths we interpolated the difference (dH) Then we determined the factor Cd with discharge measurements which we also interpolated The timing of hand measurements can be corrected to better represent the logged values The last corrections (variable "clean_corr") were made for blocking of the V-notch weir as folows: z1 represents the last good discharge value after which sedimentation slowly starts blocking the weir z2 represents the moment when the blocking is max z3 represents the moment just before cleaning of the weir z4 represents the moment after cleaning of the weir The max difference in discharge is Q(z3)-Q(z4)