Rainwater harvesting roof for water storage tank

Abstract

A rainwater harvesting roof for a water storage tank has a roof of relatively water-impermeable material substantially covering the tank. The roof has a central support supporting the roof, forming a peak, and the roof further has a substantially circumferential band of relatively water-permeable material located in the roof near the outer edge of the roof. The rainwater harvesting roof preferably also has a circumferential gutter of relatively water impermeable material depending downward from the interior surface of the roof and located beneath the substantially circumferential band of relatively water-permeable material. The circumferential gutter further has slits allowing the passage of water therethrough.

I claim: 
     
         1 . A rainwater harvesting roof for a water storage tank; the rainwater harvesting roof comprising:
 a roof substantially covering the tank;   a central support supporting the roof;
 whereby the roof has a peak at the central support; 
   the roof further comprising:
 a relatively water-impermeable material; 
 a substantially circumferential band of relatively water-permeable material located in the roof; 
 the substantially circumferential band of relatively water-permeable material situated lower on the roof than the peak of the roof. 
   
     
     
         2 . The rainwater harvesting roof of  claim 1 , where the roof is constructed in gores. 
     
     
         3 . The rainwater harvesting roof of  claim 1 , where the roof has an outer edge, and where the substantially circumferential band of relatively water-permeable material is located near the outer edge of the roof. 
     
     
         4 . The rainwater harvesting roof of  claim 1 , where the roof further comprises:
 an opening for admitting rainwater in addition to the substantially circumferential band of relatively water-permeable material; the opening further comprising:
 an area of relatively water-permeable material. 
   
     
     
         5 . The rainwater harvesting roof of  claim 1 , where the roof further comprises:
 an interior surface; and,   a circumferential gutter of relatively water-impermeable material depending downward from the interior surface of the roof and located beneath the substantially circumferential band of relatively water-permeable material.   
     
     
         7 . The rainwater harvesting roof of  claim 5 , where the circumferential gutter further comprises slits allowing the passage of water therethrough. 
     
     
         8 . The rainwater harvesting roof of  claim 1 , further comprising an access hatch in the roof for manned access to the interior of the tank. 
     
     
         9 . A rainwater harvesting roof for a water storage tank; the rainwater harvesting roof comprising:
 a roof substantially covering the tank;   a central support supporting the roof;
 whereby the roof has a peak at the central support; 
   the roof further comprising:   a relatively water-impermeable material;   a substantially circumferential band of relatively water-permeable material located in the roof near the outer edge of the roof;   the substantially circumferential band of relatively water-permeable material situated lower on the roof than the peak of the roof; and, the roof further comprises:   an outer edge;   an interior surface; and,
 a circumferential gutter of relatively water-impermeable material depending downward from the interior surface of the roof and located beneath the substantially circumferential band of relatively water-permeable material; and, 
 the circumferential gutter further comprises slits allowing the passage of water therethrough.