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000Y.14. 3 necessitate similar analyses there.. Releases from the Narrows Reservoir and from the proposed Two Forks Reservoir will require such studies on the South Platte River. Major releases to industrial users such as Eastman Kodak on the Cache la poudre River will bring pressure there for better estimates. -, The methodology and techniques for these determinations are not well es- tablished because of Colorado's utilization of long river reaches for trans- portation of water and Colorado's Appropriation Doctrine are somewhat unique in the world. It is well, however, to pay tribute to Mr. Hinderlider and his early studies at this time hecause his pioneering work serves as a fine ex- ample for modern day hydrologists. OBJECT I VES I ' This assignment was undertaken In Water Division No.2 to determine the travel time and transit losses of the Frylngpan-Arkansas Project water diver- sions introduced into the Arkansas River because the Southeastern Colorado Water Conservancy District must repay the Federal Government over a SOJyear period for the cost of the project, and it is realized that accurate travel time and an accurate charge for transit losses are required so that the re- payment contract is not jeopardized. The Division of Water Resources, the Southeastern Water Conservancy District, and the U. S. Geological Survey are presently cooperating in an effort to determine travel time and transit losses of transmountain diversions of the Fryingpan-Arkansas Project down the Arkansas River, and it has been determined that It will be necessary to Interpret the results of the hydrologic data developed by the U.S.G.S. so that it can be used for administrative purpo~s by the State Engineer in a practical and everyday manner. It was further determined that to be able to Interpret the basic hydrologic, data to the best possible extent, the engineer would need an intimate knowleqge of the Arkansas River from its headwaters to the points of diversion downstream. This, coupled with the desire to experiment with addi- tional ideas and techniques for determining travel times and transit losses, led to the present study to evaluate many techniques in the analysis of travel time and transit loss. PROCEDURES These technlquQs, utilizing temperature recordings at critical points, the use of fluorescein dye, the use of floating objects which could be physically observed, and the measuring of dissolved solids In the river at critical points and critical times, were chosen. In addition, the engineer examined the river channel for much of its length to observe localized hydro- logic and hydraulic conditions. For instance, the general relationship be- tween riffles and pools, areas of ground water inflow, reaches of rocky canyon which are essentially impervious, the character of Irrigation diversion head- works along the river, the location of tributaries, and the general exposure of the water surface as related to evaporation potential, were considered to be matters requiring personal field knowledge. Numerous photographs were taken for record purposes and for subsequent study In the office. These in- cluded black and white, color, and Infra-red, both from on the ground and from the ai r.