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<br />P_8 <br /> <br />",'OJ <br /> <br />States Geological Survey (USGS) monuments related to the <br />National Geodetic Vertical Datum of 1929 (NGVD). The <br />horizontal ground control shall be based on a minimum of 2 <br />USC&GS triangulation stations, or the equivalent. A <br />minimum of third order leveling (closures within 10.05 x <br />square root of distance in miles) shatl be used to tie <br />temporary bench marks and reference monuments to the <br />National Geodetic Vertical Datum of 1929 (NGVD); to <br />determine the elevation of high-water marks; and where <br />needed, to establish vertical control control for aerial <br />photogrammetry. <br /> <br />The ground control surveys shall be supervised by a Land <br />Surveyor licensed in the State of Colorado. All permanent <br />and semi-permanent control markers used for ground control <br />surveys shall be shown and their respective elevations <br />labeled on the work map. <br /> <br />4. Contour Interval. The work map contour interval shall be <br />5 feet or such contour interval showing greater detail. <br />The Board recommends a work map contour interval of 2 feet. <br /> <br />5. Scale. The work map scale shall be 1 inch equals 500 <br />feet or such' map scale showing greater detail. The Board <br />recommends a work map scale of 1 inch equals 200 feet. <br /> <br />6. Soot elevations. Spot elevations shall be provided at <br />all intersections of the center lines of streets and roads <br />and where needed to supplement the contours. Spot <br />elevations shall also be provided within 50 feet of any <br />building or any small group of buildings that is not within <br />the limits of a city or a town or a platted subdivision. <br /> <br />. <br />by photogrammetric methods at the time of map compilation, <br />from the map contours, or through field surveys. All <br />cross section points derived photogrammetrically or from <br />the contours shall meet the accuracy standards in rule <br />5.A.8. All field-surveyed cross section points shall be <br />within 10.5 foot of true elevations. <br /> <br />Cross sections shall be located perpendicular to the <br />direction of flow at appreciable changes in flow area, <br />roughness, or stream gradient. Additional cross sections <br />sha 11 be located at bri dges, at the head and ta il of <br /> <br />'I <br />.l <br /> <br />2 CCR 408-1 <br /> <br />THE CODE OF COLORADO REGULATIONS <br /> <br />/,,- ~ ": <br />. .:;--".';,', <br />," }'iJc' & ~- <br />,~; <br />~__T" <br />\ <br />\.........< <br />, . " <br />