Abstract: This invention relates to a floor drain and methods for its installation, more specifically to a floor or shower drain having two sets of weep holes and to a method for its installation.Conventional drains generally in use today have only one set of weep holes to drain water which may seep down to a water impervious pan. As a result, if the shower stall is installed improperly, water may seep out and cause extensive water damage.The invention relates to a shower drain installation which will be effective in preventing water damage even if the subfloor is not ideally suited for promoting drainage in a shower.

Abstract: A drywell structure for receiving drain water from a ground surface and directing it to subterranean levels for leaching the water into the subterranean soil is provided with a water filtration and intake assembly which filters silt and other foreign matter from the received drain water prior to its being directed to the subterranean soil.

Abstract: A device for a drain, such as a manhole 10 for access to a sewer, is protected by a seal structure 34 having a bottom bleeding feature such as a bottom thru-bore 42. The seal structure 34 may have a flange 38 for sealingly engaging between a cover 22 and a frame 18 around an accesshole 17 of the manhole 10. The structure 34 has a central portion downwardly depressed to avoid a path of spin of the cover 22. In a bottom portion 40 of structure 34, the thru-bore 42 bleeds (such as by thin trickling streams) into and off the sewer, sufficient fluids such as air to maintain a substantially atmospheric level of pressure in the sewer. Because of its size and shape, the thru-bore 42 advantageously bleeds into the sewer, from water introduced to manhole 10, only quantities of water known to be tolerated by the sewer system. To avoid unsanitary conditions, when water stops entering accesshole 17, the thru-bore 42 substantially completely drains away water remaining in the seal structure 34.

Abstract: This disclosure is concerned with apparatus for enabling extension or other leveling adjustment of manhole cover supporting structures and the like comprising extension spacer rings resiliently compressed in self-storing fashion adjacent a support sleeve portion of the supporting structure, and adapted to be forced downward from storage to expand into position below the sleeve to extend or adjust the level of the same.

Abstract: Manhole sealing device to prevent water from entering a manhole through the corbel joint between the manhole casing and cover frame. The device comprises a flexible tube like membrane spanning the corbel joint of the manhole and provided with first sealing means above the corbel joint to seal the membrane against the inside wall of the cover frame and second sealing means below the corbel joint to seal the flexible membrane against the inside wall of the manhole casing. The portion of the membrane between the first and second sealing means is preferably provided with enough slack to form a inward fold defining an annular pocket to contain any water or other fluids entering the manhole through the corbel joint thereof. In a preferred mode of the present invention the membrane is a bag with a closed bottom to catch any water entering the manhole through or around the manhole cover. The manhole sealing device can be installed in an existing manhole without replacing any of the structural parts thereof.

Abstract: Manhole closure assembly for preventing storm water from entering into manhole opening comprises cover section including downwardly depressed central portion. Circular mounting flange extends outwardly from depressed central portion and flange is adapted to rest upon inwardly directed manhole cover supporting flange of annular manhole frame. Downwardly depressed portion of cover section is depressed amount that exceeds path of spin of manhole cover resting upon supporting flange of annular manhole frame. First valve member is secured to cover section to relieve pressure inside manhole when pressure therein exceeds predetermined amount.