Excerpt from An Evaluation of Land Use, Hydrology, and Sediment Yield in the Mill Creek Watershed, Northern California This report summarizes studies conducted in the Mill Creek watershed by the National Park Service and usgs. The scope of the report is limited to the presentation of (1) physical data, including streamflow characteristics, flood frequency analysis, sediment discharge and size distribution, cross-section surveys, sediment storage features, and distribution of erosional landforms; (2) descriptive data from aerial photographic interpretation, current geological studies and soil-vegetation indices; (3) a brief comparison with physical processes active elsewhere in the park; and (4) management recommendations for future action in the watershed. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Excerpt from Recent Changes in Channel-Stored Sediment, Redwood Creek, California Historically, geomorphologists have studied both hillslope erosion processes and sediment transport in rivers, but few studies have quantified a link between these two areas the storage component of channels. Channels may temporarily store sediment derived from hillslope erosion before transporting it out of the system. The quantity of sediment and its residence time varies with the type of system. Streams in steep mountainous terrain store little sediment for relatively brief periods of time, whereas rivers in broad alluvial valleys store vast quantities of sediment in their floodplains for thousands of years. As a result, channel storage may modify the effects of hillslope erosion on sediment yield measurements made at a point downstream. Thus sediment yield measurements may not truly reflect current rates of hillslope erosion in a watershed. Nevertheless, changes in sediment yield are often used to detect changes in rates of hillslope erosion due to land use modifications. In basins where channels store a significant portion of sediment in transport, it is not valid to assume a constant relation between hillslope erosion and sediment yield because the amount of alluvial storage can change in response to modifications in a watershed. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

The aquatic ecosystem of Mill Creek Watershed (MCW) is currently susceptible to pollution from nutrients and heavy metals due to the various human activities within the watershed. Sediment quality parameters such as trace metals, organic matter (OM%), pH, total phosphorus (TP) and particle sizes were measured at 13 sampling points along Mill Creek. The overall objective of the research was to determine the immediate land use around each of the 13 sampling sites and how that impacts the sediment quality. Each of these sampling points were used as watershed outlets to delineate 13 distinctive drainage areas, with their individual land uses. The results showed most of the parameters measured were within acceptable values. TP values within the southern watershed were higher than all other sites (MacDonalds et.al, 2005). These observations were explained by the land use of the delineated drainage areas around each of these sites. Site 9 had about 30% of its drainage area covered by agricultural land row crops, site 10 had 20% and site 8 had 14%. Agricultural runoffs may have played a role in the TP concentration. A more direct impact may be the location of the Boardman Waste Water Treatment Plant at site 8, the semi buffered cattle ranch located by the creek at site 9 and the crop farm located at site 10. Geospatial statistical maps created showed the northern portions especially site 2A and 4 as well as some middle areas of the watershed which include mostly site 8, 9 and 10, to have higher levels of most of the trace metals compared to the sediment reference values. The calculated correlations among percentages of land use, trace metals, TP, pH & OM%, showed Ba to be statistically significant to agricultural land use. TP was also positively correlated with agricultural land use but not statistically significant. pH was significantly correlated residential areas. The other trace metals were not statistically significant with any land use which may be because of the dominant sandy particle sizes and flow dynamics of the river. The predominant residential land use and CSOs locations were perhaps the contributing sources. Ongoing studies would benefit from analyzing samples in both dry and wet seasons, and after precipitation events. Researchers may have to Incorporate sediment texture properties when sampling. Researchers may also combine Soil and Water Assessment Tools (SWAT) with sediment geochemistry to model trace metals and TP loadings if Mill Creek watershed establishes a gauge station on its main-stem.These will augment the understanding of the relationship between human activities, sediment and water quality and the importance to ecological health.