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ISFAPP01508
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Last modified
8/11/2009 11:47:21 AM
Creation date
2/26/2008 10:35:40 AM
Metadata
Fields
Template:
Publications
Year
1996
Title
Development of Instream Flow Recommendations in Colorado Using R2CROSSDevelopment of Instream Flow Recommendations in Colorado Using R2CROSS
CWCB Section
Stream & Lake Protection
Author
Gregory D. Espegren
Description
Overview of Colorado's ISF Program and documentation for the R2CROSS Lotus macro
Publications - Doc Type
Historical
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<br />The "Supplemental Data" section is <br />used to provide supporting documentation of <br />the field data collection effort. Most <br />importantly, this section is used to record the <br />tape manufacturer's standard weight (lbslft) and <br />tape tension (lbs). The R2CROSS program <br />uses this information, together with the length <br />of tape in suspension, to adjust vertical <br />distances measured from the sagging tape to a <br />level reference datum. <br />The "Channel Profile Data" section of <br />the form is used to establish the relationship <br />between the sag-tape cross section and the <br />stream. Stadia rod readings are taken at each <br />end of the suspended tape and at the water <br />surface on the right and left streambanks. <br />These readings are recorded within the "Rod <br />Reading (ft)" column. They are used to assure <br />that the ends of the tape are level and to <br />quantify the vertical distance between the <br />suspended tape and the water surface. Water <br />surface readings and horizontal distances are <br />. also recorded upstream and downstream of the <br />suspended tape. These observations are used to <br />establish the water surface slope for input into <br />Manning's equation. <br />The right side of the "Channel Profile <br />Data" section is used to graphically depict the <br />relative locations of the suspended tape and <br />survey level, the direction of streamflow, and <br />any photographic documentation of the field <br />data collection effort. Photographs of the <br />suspended tape are taken looking up, down, and <br />across the stream. <br />Biologic sampling is summarized in the <br />"Aquatic Sampling Summary" portion of the <br />field form. Biologic data typically consists of <br />a fish sample, collected by electrofishing, and <br />an aquatic invertebrate sample. Captured fish <br />are identified by species and measured to the <br />nearest inch. A species-specific length- <br />frequency distribution is created by placing a <br />hashmark in the appropriate cell of the table as <br />each fish is measured. Aquatic invertebrate <br /> <br />sampling is summarized within the space <br />provided at the bottom of this section. <br />All other pertinent field data is recorded <br />in the "Comments" section of the field form. <br />This section is often used to record weather <br />conditions, water turbidity, or species-specific <br />biomass estim~t~. This additional information <br />helps characterize the field data when it is being <br />analyzed in the office. <br />The "Discharge/Cross Section Notes" <br />portion of the field form is used to record all of <br />the hydraulic measurements associated with the <br />discharge measurement (Figure C). A heading <br />is provided to record the stream name, cross <br />section number, date, edge of water looking <br />downstream, the staging pin reading, and time <br />at the beginning of the stream discharge <br />measurement. The table below the heading is <br />used to record "Features 'i, "Distance From <br />Initial Point", "Width", "Total Vertical Depth <br />From TapeJInst(roment)", and ''Water Depth" <br />channel geometry parameters at each cell <br />vertical. Stream velocity measurements are <br />recorded under the columns labeled "Depth of <br />Observation", "Revolutions", "Time", and <br />"Velocity" for each wet cell. All discharge <br />measurement procedures are as outlined by <br />Buchanan and Somers (1969). <br />The first and last channel geometry <br />measurements are always taken at the cross <br />section stakes. Channel geometry <br />measurements should also be taken at the <br />grassline-streambank and streambank-waterline <br />intersections and at all distinguishable slope <br />breaks between these two intersection points. <br />The horizontal locations of the grassline- <br />streambank and streambank-waterline <br />intersections are also documented by placing a <br />"G" and a "W" in the appropriate row of the <br />"Features" column of the field form. Grassline <br />is identified at the normal high water line, not <br />flood stage, and is generally located below <br />sedges and other plants that may swvive <br />submerged under high flows. The "Features" <br /> <br />-6- <br />
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