Instrument: Losterdale Stock / Losterdale Weir

Summary Details

ID	LOS_stock / LOS_stock_weir
Location #	22.1 / 22.2
Measurement	Stage measured in a natural channel & weir
Catchment	Losterdale
OS Grid ref	SD 62721 52025
Elevation	197.71 m
Area	LOS_stock: 1.0 km2 / LOS_stock_weir: 0.12 km2
Data availability	LOS_stock: 05/06/2008 - 31/01/2010 & LOS_stock_weir: 06/04/2009 - 31/01/2010
Location	Swine Clough, in the headwaters of Losterdale; the weir is upstream of the channel gauge and has a significantly smaller contributing area. LOS_stock has largely been superseded by LOS_stock_weir, but monitoring is continuing at the former site.
Abstracrions	There are no upstream United Utilities abstraction points
Related sited	Upstream site, none; downstream site, LOS_out; other sites in Langden subcatchment, LOS_mid, HAR_out, LAN_mid and LAN_out

Data Download

Cross section survey data, stage/discharge data (including manual measurements of stage) and time series of levels (not corrected for atmospheric pressure) may be downloaded here  (1.4mb). (For details on using the data click here.)

Land Use / Management Changes

Areas of stock exclusion and reduced stocking levels for habitat restoration. Small areas of tree planting in the riparian areas.

• 

• Change	Work carried out	% area affected
  Stocking density	Feb 2009	100
  Tree planring	Mar 2009	5
  Total		100

Photographs

• LOS_stock: Downstream view
• LOS_stock: Upstream view
• LOS_stock_weir: upstream view

Channel Description

The channel cross-section at the instrument location is provided below. Datum is taken as the top of the diver access tube (red bar). Width is measured from the left-hand side bank when looking downstream, with locations to left of the diver tube taken as negative and those to the right positive. Details from an MSc student project are available here. (Note, the information above takes precedence over the student report.)

Stage-Discharge Relationship

A theoretical stage-discharge relationship exists for LOS_stock_weir (a rectangular thin plate weir conforming to BS3680). Rating points for LOS_stock are provided below.

Date	Time	Stage (m)	Discharge (m3/s)
06/06/2008	11:55	-0.475	0.00222
18/06/2008	08:50	-0.425	0.01501

Time Series Data

The recorded levels (not corrected for atmospheric pressure) and temperature are shown below, separated out by month. Levels from the diver located in the grip are labelled LOS_stock and those for the weir LOS_stock_weir.

Channel Level: LOS_stock

Weir Level: LOS_stock_weir