麻烦各位英语大大帮忙翻译下，只求主要意思正确，但语句一定要通顺，好的话可以追加

这是一篇关于废水影响城市供水抗旱的文章
Similar trends are observed for both nitrate and conductivity. Nitrate concentrations in the Las Vegas Wash did not change at a rata statistically different from zero (p=0.4) between January 1, 2003 and December 31, 2007. Nitrate concentrations decreased in the Colorado River at a rata of 0.00007 mg L-1d-1 (p<0.0001), yet increased in source drinking water at a rate of 0.0002 mg L-1d-1 (p<0.0001) over this same time period. Conductivity in the Las Vegas Wash did not change at a rata statistically different from zero (p=0.03) between 1 Jan . 2003 and 31 Dec. 2007.Yet, conductivity decreased in the Colorado River at a rata of 0.04 uS cm-1d-1 (p<0.0001) and increased in the source drinking water at a rata of 0.05 uS cm-1d-1 (p<0.0001) over this same period. As was the case with concentrations of pharmaceuticals and EDCs, the increased loading associated with the slight increase in flow of the Las Vegas Wash over this time period does not alone account for the concomitant increase in nitrate and conductivity in source drinking water. This is especially true when one considers that historically, source drinking water is largely composed (95% of water from the Colorado River (LaBounty and Burns, 2005), where concentrations of nitrate and conductivity actually decreased over this time period. Thus, the discrepancy between loading and source water concentration is not explained by a hydrological explanation of a system at steady state. The increase in pharmaceutical and EDC concentrations, nitrate concentrations, and conductivity in source drinking water is due to the decline in volume of Lake Mead between 1 Jan . 2003 and 31 Dec. 2007. During this time, the volume of Lake Mead decline from approximately 65% capacity, to almost 50% capacity (Fig. 2) at a rata of 0.00007 d-1 (p<0.0001).
There are two major influences on the volume of water in Lake Mead: Colorado River flow, and reservoir management. Lake Powell, another large reservoir upriver from Lake Mead is also primarily fed by the Colorado River. Thus, the total volume of water in both reservoirs is dependant on the flow of the Colorado River, but the release from Lake Powell via the Glen Canyon Dam determines the actual inflow to Lake Mead. The Colorado River inflow to Lake Powell was generally below average over the time period discussed in this manuscript, a phenomenon that the U.S. Bureau of Reclamation attributed to drought. In this 5-yr span, only 2005 had an above-average annual inflow to Lake POWELL (105%). Inflow in the other 4 yr ranged between 49 and 73% (USBOR, 2009). It is the managed release from Lake Powell which serves as the inflow to Lake Mead, thus inflows to Lake Mead are influenced by both drought and reservoir management practices.

对硝酸盐和传导性二者都观察到相同的趋势。洛杉矶沃什河的浓度硝酸盐在统计学不同于零(p=0.4)的相对准确度上在2003年1月1日和2007年12月31日之间没有变化。硝酸盐浓度在科罗拉多河以0.0007毫克L-1d-1 (p<0.0001) 的相对准确度减少，然而在水源饮用水同期却以0.0002 毫克 L-1d-1 (p<0.0001)的相对准确度增加。洛杉矶沃什湾的传导性在统计学不同于零(p=0.03)的相对准确度上在2003年1月1日和2007年12月31日之间没有变化。然而，传导性在科罗拉多河以小于标准规格0.04厘米L-1d-1 (p<0.0001) 的相对准确度减少，同时在饮用水源同期却以小于标准规格0.05厘米L-1d-1 (p<0.0001)的相对准确度增加。医药品和环境内分泌干扰物的浓度通常就是如此，与洛杉矶沃什河同期流水中有联系的微量增加而减少了的载荷并不单独构成在水源饮用水中硝酸盐和传导性的伴随增加。在一个人以历史的观点考虑这一点时，这是特别正确的。水源饮用水主要是由来自科罗拉多河95%的水组成的（拉伯尼替[LaBounty]和伯恩斯[Burns]，2005），硝酸盐浓度和传导性在那里同期事实上是减少的。因此，载荷与水源水浓度之间的差异不能由恒稳态系统的水文解释来说明。医药品和环境内分泌干扰物中的浓度、硝酸盐浓度、以及水源饮用水中的传导性应该归因于2003年1月1日和2007年12月31日之间密德湖容积的下降。在此期间，密德湖的容积以0.00007 d-1 (p<0.0001)的相对准确度从大约65%容量下降到50%（图2）
对密德湖中的水容积存在两个主要影响：卡罗拉达河水流和水库管理。包沃尔湖，另一个位于密德湖上游的大水库，同样主要是从科罗拉多河注水。因此，另个水库中的蓄水容积都依靠科罗拉多河水流，但是从经由卡基恩•达姆峡谷的包沃尔湖的释放出来的水决定流入到密德湖的实际水量。科罗拉多河流入到包沃尔湖的水在本稿中讨论的同期中低于平均水平 ，这是一种美国土壤改良局认为是干旱结果的现象。在这5年跨度内，仅仅2005年有过高于平均水平的流入到包沃尔的水量(105%)。其他4年中的流入量间乎于49-73%之间（美国复审委员会【USBOR】, 2009）。这是从包沃尔湖的起到流入密德湖作用的控制流入，从而注入密德湖的流入量既受到干旱也受到水库管理实践的影响。追问

非常感谢，这就是我一直想要的。。。
另外麻烦http://zhidao.baidu.com/question/269819853.html
http://zhidao.baidu.com/question/269930346.html?quesup1
都有悬赏。。。
不甚感激

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