Category Archives: investigations

Glacial striae in Central Park

With the intense urbanization of Manhattan, one may not expect to find much to look at in regards to natural history or geology. Of course, the fantastic Museum of Natural History displays many natural items brought in from all around … Continue reading

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Science Project

I remember creating only one childhood science-fair project; plotting the growth difference between corn seeds planted in potting soil and ordinary backyard dirt.  While I don’t remember any other science projects, I do remember the hardest part of any school project was coming … Continue reading

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Strange drainage network

Establishing a sequence of events responsible for creating a particular feature or landscape is a primary goal of geology. This involves establishing which event or feature came first, whether it be the sequence of rocks in a mountain range or … Continue reading

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Road trip photos

Last week, I took a hurried road trip across the USA from Arizona to Alabama. I documented a few of North America’s hydrologic features with photographs taken from the car window. As this was not a sight seeing trip, please … Continue reading

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The 100th meridian.

Many years ago, my parents were driving cross-country from Arizona to the panhandle of Florida along Interstate Highway 10. For curiosity, my father decided to count the number of natural channels he crossed that contained flowing water. From Phoenix to … Continue reading

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Infiltration versus runoff

Around here, people frequently make the following remark about rainfall: “What we need is one of those steady rains that soaks in instead of just running off.” I venture that comment bears similarity to many comments made at feed stores … Continue reading

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Water wells and groundwater contamination

I mentioned in my “Practicality of Geology” post that one needs an understanding of geology in order to properly construct a water well that minimizes contaminants and avoids environmental disasters. Here is an example of how water well design is … Continue reading

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Filling Tempe Town Lake

Water began flowing into Tempe Town Lake this morning. Three of the four rubber bladders forming the downstream dam were replaced, and the temporary dam was erected in place of the fourth bladder. The temporary dam will be replaced with … Continue reading

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What is the volume of Tempe Town Lake?

Purpose River discharge (typically given the variable Q) is defined as volume of water per unit time. The volume component of discharge enables volume calculations, and I wondered if I could easily calculate Tempe Town Lake’s volume from stream gage … Continue reading

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Stream gages and hydrographs

In my ramblings about weather stations, I mentioned that stream gages are another type of automated data recorder that provide real-time data to the public. Stream gages record the height of the flowing water above a reference datum (such as … Continue reading

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