Granite Portal

SurfaceMet and RAD-Met have been installed in close proximity at two locations.  Site is owned by Hetch Hetchy Water & Power (HHWP).

RAD-Met

• RAD-Met is located on top of a penstock roof adjacent to the Granite Portal valve house.
• Power connection was installed by HHWP electricians and runs to the system through rigid metal conduit from a breaker box in the valve house into the bottom of the enclosure.
• The enclosure stand ( photo ), MRR tie downs ( photo ), disdrometer stand ( photo ) are attached the concrete roof deck with concrete anchors installed by HHWP electricians.
• The MRR is mounted on METEK's aluminum tripod. MRR heater power runs through rigid metal conduit from the bottom of the enclosure to a junction box next to the MRR tripod. It was installed by HHWP electricians ( photo ). Three conductors (black [hot], white [neutral], and green [gnd]) run through the conduit to the junction box. At the junction box the conductors are wire nutted to a short piece of neoprene jacketed wire that connects to the MRR heater ( photo ). The neoprene jacket wire exits the bottom of the junction box through a cable gland and is covered with split loom ( photo ).  The MRR data cable exits the bottom of the enclosure through a cable gland. The data cable runs along the outside of the rigid electrical conduit used for the MRR power. Excess cable is coiled at the MRR tripod.
• The disdrometer power/data cable runs through rigid metal conduit from the bottom of the enclosure to a junction box next to the disdrometer stand ( photo ).  The cable goes into the junction box and exits the bottom through a cable gland.   The cable is continuous through the junction box. The cable is covered with split loom from the junction box to the sensor.
• There is no RF link to the SurfaceMet at this site as would be typical for a RAD-Met because we do not have line of site. The SurfaceMet has its own cellular modem.
• GPS antenna and cellular antenna are mounted to the enclosure stand ( photo ).

SurfaceMet

• The SurfaceMet is located some distance uphill from RAD-Met installation. The site is a burn scar from 2016 and is located on a terrace some distance from the top of the hill. The hill continue to rise to the east of the site ( photo ). The terrace sits on a ridge and has good exposure to the south ( photo ), west ( photo ), and north ( photo ). This may change has the vegetation grows back from the 2016 fire.