Questions tagged [hydrology]

The study of the occurrence, distribution, movement, and properties of the waters of the earth an their relationship with the environment within each phase of the hydrologic cycle.

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1answer
34 views

Determining depth of flow in open channel flow

Open channel flow in a circular pipe has a maximum flow Q_max at a flow depth approximately 93.8% of the pipe diameter. Calculating flow Q from depths 92.5% and 94.9% both give the same value for Q. ...
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1answer
58 views

How to cut a pipe such that water comes out evenly across the length?

I am trying to build a wetland filter for a pond. Basically, you dig a big hole, fill it with rocks (large at bottom, small at the top), and pump water deep under these rocks, so the water slowly ...
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2answers
23 views

Is VLF-EM scanning for fractures a valid way to find groundwater for a well?

I need to choose where to drill an agricultural well. I am trying to get as much water as possible (at least 100 gpm). I am considering hiring a guy who claims to be able to find water using a device ...
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5answers
104 views

Why do dams deplete rivers?

I have often heard of cases where dams reduce the flow rate of rivers downstream. This makes sense in cases where some of the water that is captured by the dam is used for irrigation and such, but in ...
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2answers
65 views

Why is the wet/dry boundary of ground not dangerous for foundations?

A building, such as a house, rests on a foundation. Beneath it is natural earth. When it rains, the ground around the foundation becomes wet. But the ground underneath the foundation does not. There ...
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2answers
322 views

Open Channel flow with pressure losses - flow depth?

In a horizontal channel that feeds off a river, does the head/pressure loss due to friction, turns etc in the channel translate to a drop in the water level between its inlet and outler? If so, could ...
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0answers
41 views

2 mm accuracy in an affordable water level sensor (pressure transducer) - Does one exist? [closed]

I'm looking to conduct water level monitoring in streams and rivers for water resource engineering purposes. My plan is to use Arduinos and Raspberry Pis in conjunction with a pressure transducer, as ...
4
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2answers
279 views

What is the technical name for a water reservoir that retains its contents via vacuum and ambient air pressure?

This is a strange question for me because this is so extremely common, but I have never heard a name to describe exactly what it is. This is commonly used to provide water to animals from a trough or ...
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1answer
77 views

What is this structure in a park

It really has no informative signs on it just signs warning not climb or careful with your ball. It is in a Japanese park. I thought it is a water mound with its lots of pipes coming out it for ...
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1answer
647 views

Peak flow calculation using rainfall data

I am trying to use the Curve Number Method to calculate the peak flow over an area. The precipitation is provided in a table, with the first column being the time (hr), second column being the ...
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1answer
499 views

What is the difference (if any) in capacity factors and efficiency between reservoir hydropower and run-of-river power plants?

My question is about differences between reservoir-hydropower and run-of-river power plants. Are run-of-river plants less efficient? what would be an approximate guess of the differences? (assuming ...
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2answers
440 views

Transporting water uphill at the highest efficiency possible?

I have a passing interest in water desalination projects. One of the challenges of desalination is simply moving the water from the ocean to the desalination plant. Typically the plant is built above ...
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1answer
418 views

Is there a method to determine the runoff for arid areas in developing countries?

Note: this question was totally rephrased and expanded on, addressing the comments and questions posed to the first version. The de-facto standard source for runoff calculations in South Africa is ...
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2answers
288 views

How much air gap is required in a storm pipe?

I'm studying the design of storm sewers and I had two questions relating to air gaps in storm pipes: According to sources I've come across, flow through storm pipes require an air gap so as to ...
4
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1answer
111 views

Terminology for ponding behind a bridge during a flood

I have read a specific term to describe the process when water pools behind a restriction such as a bridge during a flood. I cannot for the life of me remember what the word was. The term ...
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0answers
153 views

Engineering in Kazakhstan and Rainfall Intensity

We are about to commence a large project in Astana, Kazakhstan worth several hundred million dollars. The design of Stormwater quantity, quality, and hydrology will be a large component of our works, ...
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2answers
6k views

What is the purpose of these “steps” in rivers?

I have seen a number of structures within rivers, which resemble steps, and which allow the water to cascade down them instead of flowing naturally down the course of the river. Example 1: River ...
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1answer
639 views

Differences between 2D hydrological modelling programs eg. HECRAS 5.0 (2D), TUFLOW, MIKE Flood

Just wondering what the difference is between 2D flood modelling programs. I am primarily considering whether HECRAS 5.0 (2D - currently in Beta) would be an acceptable alternative for simple 2D flood ...
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1answer
356 views

Determining RTK parameters for runoff analysis

I am examining a watershed and determining runoff using the RTK method. I basically use a 'guess and check the hydrograph' method right now. I've seen calibrators that use a mutation and convergence ...