Portable drainage system for growing plants

Abstract

A plant growing system has a number of modular units arranged together on a flat surface in side of a growing room. The modular units have rigid boxes therein with vertical holes therethrough inside of which is located a growing soil. Water and nutrients are pumped from a reservoir to a distributor located in a growing soil of the rigid boxes as called for by moisture sensors, which activates a controller to turn ON a delivery pump. When moisture and nutrients need to be removed from an impermeable flexible liner located below the modular units, the controller turns ON a return pump, which pumps the excess water and nutrients back to the reservoir.

Claims

1. A plant growing system for draining water from growing soil, the plant growing system being on a relatively flat surface and recirculating water and nutrients in the plant growing soil, said plant growing system comprising: a reservoir for holding said water and nutrients therein; modular units having open top rigid boxes that contain growing soil; vertical holes through said rigid boxes; an impermeable flexible liner below and on the sides of said modular units; distributors in said growing soil; a delivery pump for pumping water and nutrients from said reservoir through input lines to said distributors in said growing soil; moisture sensors in said growing soil; return pump for returning water and nutrients from said impermeable flexible liner through return lines to said reservoir; and a controller connected to said moisture sensors, said delivery pump and said return pumps; said controller turning ON or OFF said delivery pump depending upon signals received said moisture sensors; said controller turning ON or OFF said return pump when water and nutrients need to be removed from said impermeable flexible liner.

2. The plant growing system for draining water from growing soil as given in claim 1 further compromising a pressure gauge for measuring pressure in said input lines and solenoid valves in said input lines operated by said controller when said signals from said moisture sensors are received.

3. The plant growing system for driving water from growing soil as given in claim 2 wherein said delivery pump adds oxygen to said water and nutrients being pumped through said input lines.

4. The plant growing system for draining water from growing soil as recited in claim 3, wherein said return pump draws a vacuum through said return lines located below said open top rigid boxes to remove water and nutrients from said impermeable flexible liner.

5. The plant growing system for draining water from growing soil as recited in claim 4, wherein a pickup filter is on an end of said return lines located below said open top rigid boxes.

6. The plant growing system for draining water from growing soil as recited in claim 5, wherein said return line has a sealing connector where said return line extends through said impermeable flexible liner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a top view of a portable drainage system.

(2) FIG. 2 is a front view of FIG. 1.

(3) FIG. 3 is an enlarged sectional view of FIG. 1 along section lines 3-3.

(4) FIG. 4 is an enlarged partial view of FIG. 3.

(5) FIG. 5 is an exploded perspective view of one modular unit in FIG. 1.

(6) FIG. 6 is a partial sectional view of FIG. 1 along section lines 6-6.

(7) FIG. 7 is a sectional view of the rigid boxes being stacked for shipment.

(8) FIG. 8 is an alternative embodiment of the portable drainage system being used to grow plants.

(9) FIG. 9 is an exploded perspective view of a modular unit as modified to grow plants.

(10) FIG. 10 is a top view of a modular unit being used to grow plants.

(11) FIG. 11 is a cross-section of FIG. 10 along section lines 11-11.

DETAILED DESCRIPTION OF THE INVENTION

(12) A portable drainage system is illustrated in the top view shown in FIG. 10. The portable drainage system has modular units 12 that are rectangular in shape and located side by side. Ramps 14 are provided so that loading equipment such as front loaders can be driven on top of the portable drainage system 10. As will be explained in more detail subsequently, an air inlet pipe 16 connects through a valve 18, below the modular units 12, to a perforated header pipe 20. FIG. 2 is a side view of FIG. 1.

(13) Referring to FIG. 3, an enlarged cross sectional view of FIG. 1 along section lines 3-3 is shown. The modular units 12 are located side by side with the air inlet pipe 16 providing air through connecting cross slots 22 to the perforated header pipe 20, which perforated header pipe 20 is buried in a porous granular material 24.

(14) As illustrated in FIG. 3, a portable drainage system 10 has an upslope end 26 and a downslope end 28. On the upslope end 26 is the air inlet pipe 16 and on the downslope end 28 is the perforated header pipe 20. The slope between the upslope end 26 and the downslope end 28 is approximately 2-3 degrees.

(15) Referring to FIG. 5, the construction of a modular unit 12 is shown in an exploded view. The modular unit 12 has a rigid box 30 which is almost 4 feet by 4 feet but not quite. Small vertical holes 32 extend through the bottom 34 on the rigid box 30. In the bottom 34 of the rigid box 30 are the connecting cross slots 22.

(16) Within the rigid box 30 is a site specific drainage fabric 36. The site specific drainage fabric 36 should be a tight enough weave so the granular material being drained will not pass there through, but not so tight that water or other fluids will not drain there through. The site specific fabric 36 extends up the inside walls of the rigid box 30, the upper edges of which may be held in position against the inside of the rigid box 30 by any convenient means such as snaps.

(17) Inside of the rigid box 30 and the site specific drainage fabric 36 is located a four inch cellular confinement, also referred to as expanded geosynthetic material 38. The expanded geosynthetic material 38 extends upward to the top 40 of the rigid box 30. Filled within the expanded geosynthetic material 38 also to the top 40 of the rigid box 30 is sand (not shown), or whatever porous granular material 56 is available at the site. See FIG. 6.

(18) Extending across the top 40 of multiple rigid boxes 30 is a high flexural strength mat 42, such as those sold under the trademark Geoterra®. The high flexural strength mats 42 may be connected to adjacent high flexural strength mats 42 by connecting tabs 44. The connecting tabs 44 are attached together by any convenient means such as locking screws (not shown).

(19) Referring to FIG. 4 and FIG. 5 in combination, below the rigid boxes 30 for the entire portable drainage system 10 is located an impermeable flexible liner 46. The impermeable flexible liner 46 also extends upward to the top on the outside of all the rigid boxes 30 collected together. The impermeable flexible liner 46 is cushioned on either side thereof with cushioning layers 48 and 50, which cushioning layers are made of non-woven geotextile material. The cushioning layers 48 and 50 also extends up the outside of all the rigid boxes up to the top thereof, the same as the impermeable flexible liner 46.

(20) The outer edges of the rigid boxes 30 are connected together by plates 52 and bolts 54 which screw into rigid boxes 30.

(21) FIG. 4 shows a porous granular material 56 (such as sand) that is placed inside of expanded geosynthetic material 38 contained within rigid boxes 30. The porous granular material 56 is also located around the perforated header pipe 20. Once the portable drainage system 10 has been assembled with porous granular material 56 located within the expanded geosynthetic material 38, then high flexural strength mats 42 are placed across the tops 40 of the rigid boxes 30. Thereafter, heavy equipment such as a front end loader 58 may be driven on the top of the portable drainage system 10 without causing damage to the drainage system 10.

(22) Referring now to FIG. 6, if the valve 18 is opened, air inlet pipe 16 allows air to flow there through in the direction indicated by the arrows and into connecting cross slots 22 in the bottom 34 of the rigid boxes 30. Because the water flows downhill and the air inlet pipe 16 is on the upslope end 26, water will flow to the downslope end 28 where the perforated header pipe 20 is located within the porous granular material 56. See FIG. 3. The perforated header pipe 20 will take the drained water (or decant) away for suitable disposal in a drainage pond (not shown) or some other off site location.

(23) During movement between different sites, rigid boxes 30 are shown FIG. 7 stacked together ready for shipment. The outer edges of the rigid boxes 30 have an indent 60 where the top 40 of a lower rigid box 30 will fit. Therefore, the rigid boxes 30 can be stacked multiple boxes high during transportation without scooting all over the transportation vehicle. Further in FIG. 7, the small vertical holes 32 through the bottoms 34 of the rigid boxes 30 are shown in more detail.

(24) By using the portable drainage system 10 as just described, and due to the natural flowing of water downslope, a slight vacuum is created that will suck air into the air inlet pipe 16, through valve 18, and connecting cross slots 22 as the water flows downslope to the perforated header pipe 20 for removal from the portable drainage system 10. This natural aspiration without mechanical pumps creates an inexpensive portable drainage system for bulk granular materials.

(25) Referring now to FIGS. 8-11, an alternative plant growing system 200 is shown for the portable drainage system previously shown and explained. The plant growing system 200 has modular units 202, which are shown in an exploded perspective, sectional view of FIG. 9. The modular units 202 have a rigid box 204 that has vertical holes 206 therethrough. In the bottom 207 of the rigid boxed 204 are cross slots 208.

(26) Inside of the rigid boxes 204 is a sight specific drainage fabric 210. Contained in the sight specific drainage fabric 210 is located growing soil 212. The sight specific drainage fabric 210 is woven so that it is dense enough to retain the growing soil 212, yet course enough that it will allow water or similar fluids to pass therethrough.

(27) In a plant growing system 200, there may be one or more of the modular units 202. An impermeable flexible liner is located under and around all of the modular units 202 contained in the plant growing system 200. Normally, there will be many modular units 202 connected together, all of which are contained within the impermeable flexible liner 214.

(28) In case the cross slots 208 are not deep enough, or more room is needed below the rigid box 204, the rigid box 204 may be mounted on post 216.

(29) Referring now to FIGS. 8 and 9 in combination, water reservoir 218 contains water and nutrients necessary to grow plants. A controller 220 controls action within the plant growing system 200. The controller 220 will turn on the pump 222 to pump water and nutrients from the water reservoir 218, through pressure gauge 224 and valves 226, to distributor heads 228 in modular units 202. The distributor heads 228 connect to distribution lines 230 in each of the modular units 202. Moisture sensors 232 are located in each of the modular units 202. Moisture sensors 232 are connected to controller 220, which connections are not shown in the drawings.

(30) In the bottom of the impermeable flexible liner 214 is a pickup filter 234 that connects to return line 236, which connects through pressure gauge 238 to return pump 240. The controller 220 senses when water 242 (See FIG. 11) and nutrients have accumulated at the bottom of impermeable flexible liner 214. Then the controller 220 will turn on the return pump 240 to return the water 242 to the water reservoir 218. The sensing of water 242 and the bottom of impermeable flexible liner 214 may be by any convenient means, such as a pressure sensor or timing.

(31) To make sure that the impermeable flexible liner 214 does not leak around the return line 236, sealing connector 244 seals between the return line 236 and impermeable flexible line 214. On the input side an input line 246 is shown with elbows 248 to connect over the top of rigid box 204 to the growing soil 212.

(32) In operation, plants 250 are planted in the growing soil 212. If the moisture sensors 232 indicate the moisture in the growing soil 212 is below the optimum moisture content, pump 212 will be turned ON to pump water 242 and nutrients from the water reservoir 218 through pressure gauge 224 and input line 246 through valves 226 into distributor heads 228. Distributor heads 228 will feed the water through distribution lines 230 to the growing soil 212. Once a desired moisture content is reached, as determined by moisture sensors 232, delivery pump 222 will be turned OFF.

(33) As water 242 accumulates inside of impermeable flexible liner 214, return pump 240 will turn ON to create a vacuum and draw the water through pickup filter 234, return line 236, and pressure gauge 238 for discharge into water reservoir 218.

(34) Pump 222 may be an aspirating pump that mixes air with the water 242 and other nutrients being delivered from the water reservoir 218.

(35) By continuing to circulate the water 242 and other nutrients through the growing soil 212, the plant growing system 200, as shown in FIGS. 8-11, is similar to, but not quite the same as, a hydroponic growing system. This is a specially desirable for growing rooms that are enclosed which can control other variables, such as light, temperature or humidity. Other sensors as needed can, can be connected to controller 228 to control other functions as may be desired by the grower. When the return pump 240 turns ON relief valve 252 on the water reservoir 218 may have to open to relieve pressure therein.

(36) The impermeable inflexible line 214 may or may not have cushioning layers 48 as described in conjunction with FIGS. 1-7. Because the plant growing system 200 is designed for a growing room, the cushioning layers 48 may not be necessary.

(37) The nutrients being added to the water 242 and in the growing soil 212 depends on the plants 250 being grown and their nutrient requirements.