rain water harvesting pond

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Hi everyone

 Looking some information about rain water harvesting methods for dry season  irrigation system ?

pond size/dimensions/ for 5000m2 irrigate  land area for 8 months seasons?

effective way of pond construction ?

pond cover to prevent evaporation?

operating time?

quick grow and valuable crops?

other valuable information .....if you have full design data  Please send me no matter the raw data different .

Thank you .

4 Answers

  1. Hi,

    with very limited detail it’s very hard to give a direct result. However, I’d suggest to search for the following data and parameters so you can estimate your water requirement, crop types and ponds volume requirement.

    1. Surface temperature (and humidity and sun radiation if available) => to calculate potential and reference evapotranspiration (ETR) e.g. using simplified Penman-Monteith eq. You can use other ETR formula adjusted with your data availability which is quite abundant. Some data is available from global satellite/spatial modeling e.g. from Copernicus for europe, ERA-5 global data, etc.

    2. Soil condition => calculate infiltration and mineral leaching (mainly salt due to low resistance of crop majority to salination). Also to calculate potential water content (simplest way is to use soil water retention curve which include field capacity and wilting point).

    3. Crop coefficient (Kc) which depends on type of crop and also time of crop growth. This is to calculate estimated actual ETR (Act ETR = Kc*ET0, where ET0 is potential ETR).

    4. Precipitation => estimate/project precipitation in the future especially with regard to climate change. So that correct pond dimension and recharge period and rate might be estimated.

    Other parameters that might also be included is the irrigation efficiency which depends on type of irrigation used. This irrigation type is also related with your topography, soil type, other infrastructure e.g. electricity supply, etc.

    1 Comment

  2. First, your water requirement @ 3 l/m2 (maximum) per day with micro irrigation = 5000 *3= 15000 lpd. 

    Second your storage capacity : How many days' support you need from the farm-pond? Apart from rainy season. Say, If 200 days for example, then the pond capacity should be 15000 LPD*200 days  = 3 million liters + allowance for evaporation losses. Considering depth of farm pond at 3 meter and storage embankment above ground = 3 m, you will need apporx 900 sqm land for the pond. The pond must be fitted with pond-lining film availabe all over.  

    Where are you situated? Because cost you have to work out as per your conditions / rates / currancy. 

    Share your e-mail, I can give you detailed design. 

     

    1 Comment

    1. Thank you Yashpal

      I sent you my email by your email.

      Commented on by

  3. Kind of a broad request.  However not knowing where you are, or any other pertinent information you should plan on needing for irrigation about 8 mm/day.  Over the area size and the 8-month season specified, that equals 9,600 cu meters of water needed for irrigaton. 

    1 Comment

    1. Thank you.

      Commented on by

  4. Hi, 

    Please let me know where are you based, what are the rainfall data .

    What type of land you plan to use.  

    Any idea how much water you would need for during the off season . 

     

    I am sure you do not plan to use only rain water for harvesting . What percentage you plan to retain for the purpose .

     

    If you want , you may contact me further for  discussion. My email is pd@vertexengineeringsolution.com  

    2 Comments

    1. Hi Dev, do you have any open source design report for the same

    2. Thank you.

      Location Ethiopia, flat land with clay soil, only rain water only for harvesting   because those seasons are dry season.

      Area for irrigation 5000m2.for 8 dry months.