# Questions tagged [water-resources]

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19 questions with no upvoted or accepted answers
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### 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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### 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 ...
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### Determing the optimal dimensions for hydrocyclone water/sediment separation

OK, let's be clear: I'm a software engineer (retired), not a physicist, hydrologist, or hydraulics person, so please be gentle. Back Story: In the process of developing an open source system for ...
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202 views

### Fluid Statics Problem

I have been attempting this question for a while now. Could anyone give me a hand? The question and the work I have done so far is below. My final "answer" is P (force required to keep the gate ...
• 51
131 views

### What are the best materials to use for producing drinking water from the Air?

There are several companies producing equipment that produce drinking water from the air. They use dessicants, hygroscopic brine, or deliquescent salts, to adsorb water from atmospheric humidity. ...
1 vote
99 views

### Calculating discharge from a reservoir as the head of water decreases

Due to the dry weather we've been experiencing in the UK I need to calculate the discharge rate from some reservoirs for work and how the dropping water level will result in a reduced head and so a ...
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1 vote
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### Why do forward osmosis membranes face less scaling?

Forward osmosis (FO) is an osmotic process that, like reverse osmosis (RO), uses a semi-permeable membrane to effect separation of water from dissolved solutes. The driving force for this separation ...
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1 vote
23 views

### How to build multiple large scale fish tanks with water at different temperatures

I am wondering at a high level what are the material components that might be used in building several large scale fish tanks that are temperature regulated like on a fishing farm. For example, what ...
1 vote
20 views

### How can I set up a reverse osmosis water system to use a pressure tank?

Most home reverse osmosis water systems use a low pressure bladder type tank that has 5-10 PSI. That way the back pressure on the RO system is not too high. I want to use a glass-lined tank of the ...
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44 views

### Is Hetch Hetchy water filtered at all?

I've been reading about Hetch Hetchy drinking water and was surprised to learn that it's not filtered. From Wikipedia: Water from Hetch Hetchy is some of the cleanest municipal water in the United ...
20 views

### What is the lowest energy solution for emptying a drip irrigation water collector : a mono-stable solenoid valve or a bistable coupled to a pump?

I have a water collector I want to empty everyday for drip irrigation. It is controlled by a micro-controller. I have identified three solutions: Use a bi-stable electro-valve and a pump: advantage ...
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36 views

### How to move water to a new dam?

There are many videos on Youtube about opening of new dams, where the water is already ready to go though the dam. What I wonder is how engineers moves water to a new dam. To me it seams as a chicken ...
64 views

### Water flow down a 9% grade for 750' then fills tanks before traveling up 20' over 175'

I'm in hopes that someone far smarter than myself can tell me the answer to my questions. I am setting up a water capture system for a spring. The spring drains into a pond where I am installing a 525 ...
45 views

### Is there a miniture atmospheric water vapor condenser?

I am looking to add a condenser for a plant preserving container. The plants need water and I was wondering if I can have a passive method to condense atmospheric moisture to water. My container is ...
20 views

### Factoring in Efficiency in Equations

A pretty simple question, but one that's weirdly confusing me: I'm working with an equation for total water demand (Q) were w is the allowance for water wasted. w is typically 30%. Most books ...
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### How to calculate the force required to move this water bot with certain speed

This is my project where I have created a river cleaning machine. It works fine but no actual calculations have been done regarding the power requirement of motors(A software engineer ). The machine ...
48 views

### Borewell motor water outlet adjustment

Recently we put 500 feet borewell in our area, it's hot summer season now. Person who drilled the borewell told me that we can get 1.5 inch of water now. During winter season we can expect at least 2 ...
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### How do I build a water Ram Pump that will pump 400 feet and 30 feet vertically

I'm interested in building a ram pump to pump water from a creek that runs at the bottom of my property to the top where i'm going to make my little homestead. I've seen allot of stuff online on ...
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