It’s easier to transport and place smaller tanks, and we can place them in different locations to capture rainwater from different aspects or sides of a roof (or multiple roofs). One large tank will take up less space, but it can also mean that you can only capture the water from one roof location, limiting your harvesting capabilities.
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From our many years of experience in supplying and installing water tanks, we have found that having three round tanks holding 29,000 litres each (total 87,000 litres) will easily keep even a large family in water all year round.
The water supply is the heart of any irrigation development and a water permit is required for all water appropriations except domestic use, including livestock, and non-commercial lawn and garden irrigation of five acre or less. The amount of water you will need is about six gallons per minute (gpm) per irrigated acre during July and August. For example, if you want to irrigate 100 acres, you will need a water source that can produce about 600 gallons per minute.
Where does this recommendation come from? The average peak daily crop water use of most irrigated crops in North Dakota is about 0.27 inches per day under well-watered conditions (no water stress) and that translates to about 6 gpm of water use applied over a 24-hour period to replace the water the crop has transpired.
A water permit must be obtained before constructing a well or any device for capturing water from a surface source and installing an irrigation system. The application form and instructions for an irrigation water permit can be obtained from the Appropriations Division of the Department of Water Resources (www.swc.state.nd.us/reg_approp/waterpermits/). You may need to fill out the permit application with the help of a local surveyor or a consulting engineer. When a water permit is first issued it is called a conditional permit, which is good for three years. Within the three-year period, the water source must be developed and the irrigation system installed. It will then be inspected by a representative of the Appropriations Division. If approved, the conditional permit will be changed to a perfected permit.
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If surface water is the source (pond, lake, river, etc.), you must determine if there will be sufficient water available during the summer months or extended dry periods. If groundwater is the source, use aquifer information from the North Dakota Water Resources Department (see sources of information at end of this section) to determine the location, size and potential production capacity of the aquifers at the location of field to be irrigated.
Small aquifers may exist that are not shown in the county ground water surveys. Drilling test holes is the only sure way to determine if sufficient water is available from the aquifers in these areas. A permit is not required to drill test holes. However, before drilling test holes, it would be wise to consult a groundwater hydrologist with the Appropriations Division. If there is sufficient water, one or two of the test holes should be developed as observation wells to monitor the effect of irrigation pumping on the aquifer water levels and assist in diagnosis of production well problems should they occur in the future.
Both ground water and surface water chemistry should be determined to make sure it is suitable to apply to the soil in the field of interest. A water sample can be sent to the NDSU Soil and Water Testing Laboratory or private testing companies for analysis. The location of the field should be included with the water sample sent to NDSU to obtain a soil-water compatibility recommendation. Soil-water compatibility is very important because the soil type will determine the quality of water that can be used.
Sources of information for water:
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